The document discusses gear tooth defect detection in wind turbines using vibration analysis. It introduces Sideband Energy Ratio (SER), an algorithm that calculates the ratio of sideband energy around a gear mesh frequency to the energy at the gear mesh frequency. A higher SER value indicates more sideband energy relative to the gear mesh, suggesting gear tooth damage. The document presents a case study where documented gear tooth damage in wind turbine gearboxes produced higher SER values, clearly detecting the known defects. SER is presented as an effective method for early detection of gear tooth issues using vibration monitoring.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
In our daily life we see so many antennas everywhere, from simple radio transreceiver to big tower antennas and DTH antennas. Antenna is a magical element in the field of communication. Nobody can dream of wireless communication without the use of antennas. It’s the antenna which creates the magic in the air and makes wireless communication possible.
In this paper authors will discuss about the cellular antennas. They will concentrate mainly on fundamentals of antenna, relationship between frequency, wavelength and dipole wave propagation and parameters of antenna like Gain, VSWR, SFR and FBR etc.
Authors also discuss about types of down tilt, generic requirements of antennas, selection of antennas and beam forming and active antenna systems.
Initially, many designers may be concerned about the complexity of regional norms, because in different regions of the world, norms vary. However, as long as more research is done, it will be able to understand and comply with the regulations of different regions, because, in each region, there is usually one government unit responsible for promulgating the relevant documents to explain "the rules relating to specific-purpose transmitters."
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
In our daily life we see so many antennas everywhere, from simple radio transreceiver to big tower antennas and DTH antennas. Antenna is a magical element in the field of communication. Nobody can dream of wireless communication without the use of antennas. It’s the antenna which creates the magic in the air and makes wireless communication possible.
In this paper authors will discuss about the cellular antennas. They will concentrate mainly on fundamentals of antenna, relationship between frequency, wavelength and dipole wave propagation and parameters of antenna like Gain, VSWR, SFR and FBR etc.
Authors also discuss about types of down tilt, generic requirements of antennas, selection of antennas and beam forming and active antenna systems.
Initially, many designers may be concerned about the complexity of regional norms, because in different regions of the world, norms vary. However, as long as more research is done, it will be able to understand and comply with the regulations of different regions, because, in each region, there is usually one government unit responsible for promulgating the relevant documents to explain "the rules relating to specific-purpose transmitters."
2008 IEEE AP-S-Internal Wideband Monopole Antenna For MIMO Access-Point Appli...Saou-Wen Su
A three-antenna MIMO system capable of generating a wide operating bandwidth of 2400-5850 MHz for access-point applications is introduced. The proposed design is based on a bent metal-plate monopole antenna with a compact size of 20 × 20 × 14 mm3. The three antennas are equally spaced along the perimeter of a circular ground and all generate a wide bandwidth of larger than 4 GHz. With the antenna short-circuiting facing the center of the ground, not only the overall antenna size is reduced but also good isolation of less than -20 dB can easily be obtained. Calculated envelope correlation is also less than 0.002 across the operating band.
Effects of bending on a flexible metamaterial absorberjournalBEEI
This paper presents a study of bending a metamaterial based absorber. The study of bending is important for textile material since it can be easily crumpled. The basic absorber that is simulated for the study is an annulled circle as the top patch, and metal ground plane that sandwich a textile-based substrate. The center frequency for the absorber is 10.525 GHz. The type of bending is divided into two parts, which is convex bending and concave bending. Through series of simulations, the effects of the bending on the absorptivity and the shifting of the resonant frequency is observed. Also, the study on the change of incident and polarization angle is also included to support the basis of flexible metamaterial absorber affected by the bending.
Erbium-Doped Fiber Amplifier (EDFA) is an optical amplifier used in the C-band and L-band, where the loss of telecom optical fibers becomes lowest in the entire optical telecommunication wavelength bands. Invented in 1987, an EDFA is now most commonly used to compensate the loss of an optical fiber in long-distance optical communication. Another important characteristic is that EDFA can amplify multiple optical signals simultaneously, and thus can be easily combined with WDM technology.
Investigation of Integrated Rectangular SIW Filter and Rectangular Microstrip...IJASCSE
This paper presents an investigation based on the resonant circuit approach to characterize an integrated microwave filter and antenna from a lumped element prototype. This approach is used to design an integrated filter and antenna to reduce the overall size of the physical dimensions of the RF/microwave front-end subsystem. This study focuses on the integration of a rectangular Substrate Integrated Waveguide (SIW) filter with a rectangular microstrip patch antenna to produce a filtering and radiating element in a single device. The physical layouts of the SIW filter and rectangular microstrip patch antenna based on single- and dual-mode will be developed. To prove the concept, the integrated microwave filter and antenna at a center frequency of 2 GHz is demonstrated and validated through simulation and laboratory experiments. The experimental performance yielded promising results that were in good agreement with the simulated results. This study is beneficial for microwave systems, given that the reduction of the complexity of design and physical dimension as well as cost are important for applications such as base stations and multiplexers in wireless communication systems.
2008 IEEE AP-S-Internal Wideband Monopole Antenna For MIMO Access-Point Appli...Saou-Wen Su
A three-antenna MIMO system capable of generating a wide operating bandwidth of 2400-5850 MHz for access-point applications is introduced. The proposed design is based on a bent metal-plate monopole antenna with a compact size of 20 × 20 × 14 mm3. The three antennas are equally spaced along the perimeter of a circular ground and all generate a wide bandwidth of larger than 4 GHz. With the antenna short-circuiting facing the center of the ground, not only the overall antenna size is reduced but also good isolation of less than -20 dB can easily be obtained. Calculated envelope correlation is also less than 0.002 across the operating band.
Effects of bending on a flexible metamaterial absorberjournalBEEI
This paper presents a study of bending a metamaterial based absorber. The study of bending is important for textile material since it can be easily crumpled. The basic absorber that is simulated for the study is an annulled circle as the top patch, and metal ground plane that sandwich a textile-based substrate. The center frequency for the absorber is 10.525 GHz. The type of bending is divided into two parts, which is convex bending and concave bending. Through series of simulations, the effects of the bending on the absorptivity and the shifting of the resonant frequency is observed. Also, the study on the change of incident and polarization angle is also included to support the basis of flexible metamaterial absorber affected by the bending.
Erbium-Doped Fiber Amplifier (EDFA) is an optical amplifier used in the C-band and L-band, where the loss of telecom optical fibers becomes lowest in the entire optical telecommunication wavelength bands. Invented in 1987, an EDFA is now most commonly used to compensate the loss of an optical fiber in long-distance optical communication. Another important characteristic is that EDFA can amplify multiple optical signals simultaneously, and thus can be easily combined with WDM technology.
Investigation of Integrated Rectangular SIW Filter and Rectangular Microstrip...IJASCSE
This paper presents an investigation based on the resonant circuit approach to characterize an integrated microwave filter and antenna from a lumped element prototype. This approach is used to design an integrated filter and antenna to reduce the overall size of the physical dimensions of the RF/microwave front-end subsystem. This study focuses on the integration of a rectangular Substrate Integrated Waveguide (SIW) filter with a rectangular microstrip patch antenna to produce a filtering and radiating element in a single device. The physical layouts of the SIW filter and rectangular microstrip patch antenna based on single- and dual-mode will be developed. To prove the concept, the integrated microwave filter and antenna at a center frequency of 2 GHz is demonstrated and validated through simulation and laboratory experiments. The experimental performance yielded promising results that were in good agreement with the simulated results. This study is beneficial for microwave systems, given that the reduction of the complexity of design and physical dimension as well as cost are important for applications such as base stations and multiplexers in wireless communication systems.
PROJECT DESCRIPTION
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The main objective of this project is to develop a device for wireless power transfer. The concept of wireless power transfer was realized by Nikolas tesla. Wireless power transfer can make a remarkable change in the field of the electrical engineering which eliminates the use conventional copper cables and current carrying wires.
Based on this concept, the project is developed to transfer power within a small range. This project can be used for charging batteries those are physically not possible to be connected electrically such as pace makers (An electronic device that works in place of a defective heart valve) implanted in the body that runs on a battery.
The patient is required to be operated every year to replace the battery. This project is designed to charge a rechargeable battery wirelessly for the purpose. Since charging of the battery is not possible to be demonstrated, we are providing a DC fan that runs through wireless power.
This project is built upon using an electronic circuit which converts AC 230V 50Hz to AC 12V, High frequency. The output is fed to a tuned coil forming as primary of an air core transformer. The secondary coil develops a voltage of HF 12volt.
Thus the transfer of power is done by the primary(transmitter) to the secondary that is separated with a considerable distance(say 3cm). Therefore the transfer could be seen as the primary transmits and the secondary receives the power to run load.
Moreover this technique can be used in number of applications, like to charge a mobile phone, iPod, laptop battery, propeller clock wirelessly. And also this kind of charging provides a far lower risk of electrical shock as it would be galvanically isolated.
Solar tracking system, Full Report Submitted in B.Tech, Electrical & Electronics Engineering Final Year @ College of Engineering Roorkee-247667, Uttarakhand, INDIA.
Regards, Mr. SYED HAIDER ABBAS
MOB. +92-300-2893683 MBA in progress,NEBOSH IGC, IOSH, HSRLI, NBCS,GI,FST,FOHSW,ISO 9001, 14001,
'BS OHSAS 18001, SAI 8000, Qualified .
Modeling, Simulation And Implementation Of Adaptive Optical System For Laser ...IJMER
Adaptive Optical System (AOS) for correction of beam jitter in a high power laser source is described. The jitter in a high power laser may results from platform vibrations and dynamically varying in-homogeneities in the lasing medium. The effect of beam jitter on the performance of high power laser in directed energy weapon (DEW) system is discussed. Simulation studies have been carried out to optimize parameters of jitter correction system. An experimental arrangement to stabilize a high power laser beam is described and results are presented.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna
resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different
details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different
details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna
resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different
details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna
resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different
details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
BODY ANTENNA WITH DGS FOR BODY CENTRIC WIRELESS COMMUNICATION SYSTEMjantjournal
This paper presents modified patch antenna for 3 GHz and 5 GHz operating frequencies. Here different approaches are studied by varying slot sizes, defected ground size, notch and also changing feed position. Insertion of slots gives dual frequency operation. Notch provides shifting of lower frequency band towards left hand side. Here combined effect of each techniques adopted gives desired result. Proposed antenna resonates for 3 and 5 GHz frequency. Simulation is done using IE3D software for various parameters. Return loss of final design was -12.17 dB for 3 GHz frequency and VSWR of 1.65. For 5 GHz simulation response was -10.04dB return loss and VSWR of 1.91. Proposed antenna is fabricated giving different details. Paper gives good agreement between measured and simulated results.
While an EMAT (Electro Magnetic Acoustic Transducer) in its simplest form is comprised of a magnet and an RF coil used to generate sound by electromagnetic induction in materials it is actually a rather complex system where each part of the sensor and instrumentation needs careful optimization for application specific performance. Historically EMAT inspection has suffered in widespread use because of a fundamental problem with the technology which is transducer inefficiency. EMAT requires very high power and very precise electronic designs to generate and
detect the signals.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Similar to Wind energy resource assessment and forecasting (20)
The technology and thermal efficiencies of the coal-fired
cycle have improved dramatically, and the basic idea
of converting the stored energy of coal into electricity
accounts for more than 40% of the world’s power.
The use of LNG is a proven, reliable, and safe process, and natural gas is quickly becoming the world’s cleanest burning fossil fuel as it emerges as the environmentally preferred fuel of choice. It is for this reason that LNG facilities are put under more pressure than ever to meet the world’s natural gas demand. Keeping your plants running at an efficient pace is vital to production and condition monitoring plays a critical part in this process. Condition monitoring provides a proactive approach so that maintenance can be planned, eliminating unscheduled outages and optimizing machine performance. In addition, condition monitoring helps to avoid breakdowns with subsequent secondary damage and loss of production revenue meaning that today’s LNG facilities simply can’t afford to not have a reliable condition monitoring solution.
In 2005, the Bently Nevada team entered a long term service agreement (sometimes known as Supporting Services Agreement, or SSA) with a petrochemical plant in India. Scope of work included monthly visits for machinery
diagnostics and regular optimization of data collected in the machinery management software – which included both Data Manager* 2000 & System 1* installations. The events described in this article took place on a compressor unit in one of the main plants at the facility.
Keyphasor is a measuring important parameter for operation and maintenance. This document discusses where the key phasors are to be installed there are locations like the driver area, input/output gear area and location of the load key phasors locations these key phasors are mainly redundant. The key phasor and the notch have to be located and documented accurately for easy and effective maintenance. It discusses the relations of absolute phase and phase lag concepts.
Keyphasors are used mainly for the operator and the machine to identify operational ambiguities. Key phase as the word indicates Key(Important) Phase(1 Cycle) is a Voltage signal generated per rotation of the rotating body. This analysis can be done using various plots and they play a key role in identifying issues in the plant machinery the operator can use this details to distinguish b/w critical and not so critical issues and can also help in saving the plant asset from harm.
Performance monitoring is critical for those seeking to get the most from their machinery and processes. This article talks about how the financial benefits of performance monitoring are consistent and compelling.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Epistemic Interaction - tuning interfaces to provide information for AI support
Wind energy resource assessment and forecasting
1. Wind energy resource assessment and forecasting
Detection of Wind Turbine Gear Tooth Defects Using
Sideband Energy Ratio™
J. Hanna
Lead Engineer/Technologist
jesse.hanna@ge.com
C. Hatch
Principal Engineer/Technologist
charles.hatch@ge.com
M. Kalb
Lead Engineer/Technologist
matt.kalb@ge.com
A. Weiss
Senior Product Manager
adam.weiss@ge.com
H. Luo
Senior Technical Manager
luoh@ge.com
GE Energy
1631 Bently Parkway South
Minden, Nevada USA 89423
Abstract:
Gear tooth defect detection is an important capability of any wind turbine condition monitoring system.
The Bently Nevada ADAPT.wind™ monitoring system has been designed specifically to monitor gear tooth condi-
tion and bearing health of wind turbine generators. The focus of this paper is the theory and application of gear de-
fect detection using machine casing vibration. Sideband Energy Ratio™ (SER), a patent pending algorithm utilized
in the Bently Nevada ADAPT.wind monitoring system, has been developed specifically to aid in the detection of
gear tooth damage. SER calculates the ratio of side band energy to gear mesh center frequency energy and has
demonstrated high sensitivity to gear damage in several cases. The theory behind SER and a case history showing
successful gear tooth defect detection on parallel stage gear meshes of two wind turbine gearboxes is presented.
These gearboxes were inspected, and specific gear damage was documented prior to sensor installation and data
collection. These gear defects are clearly visible in the data when analyzed utilizing the Bently Nevada
ADAPT.wind monitoring system and the SER algorithm.
Key Words: wind, turbine, gear, mesh, sideband
2. Introduction
Historically gear defects within a wind turbine gearbox have been difficult to diagnose at an early enough stage such
that maintenance and repairs for these defects can be scheduled in advance. Most wind turbine gearboxes have sev-
eral speed increasing stages which each produce a different gear mesh frequency. The gearboxes also transfer a very
large torque from the main rotor to the generator through these gear meshes resulting in relatively high energy gear
mesh frequencies when compared to the energy level of signals produced by a small gear defect. Because of the
overpowering gear mesh frequencies, gear defect signatures can often be obscured in the overall vibration signal and
difficult to diagnose. Recently a new algorithm, Sideband Energy Ratio™ (SER), has been developed specifically to
auto-detect and distinguish gear defect signatures within an overall vibration signal and provide an early detection
warning of developing gear damage.
Amplitude Modulation
To understand SER, first sidebands must be understood. Sidebands appear in a spectrum around a center frequency
and generally occur as a result of an amplitude modulation of that center frequency. Amplitude modulation itself has
a familiar use in AM radio in which it is used as a technique for transmitting information via a radio carrier wave. In
typical amplitude modulation, the carrier signal is a single tone with frequency, , similar to Eq. (1).
cos 2 (1)
The amplitude, A, of the carrier signal is modulated by a lower frequency modulation signal (this is the message
signal for communications), .
1 (2)
Without loss of generality, we can assume the modulation signal is a single frequency tone with frequency, . Sub-
stituting this in for in Eq. (2) gives the following.
1 cos 2 cos 2 (3)
Where is called the modulation index (which is less than 1 in radio communication for better signal recovery).
Expanding Eq. (3), we have
cos 2 cos 2 cos 2 (4)
As a result, this amplitude modulation produces multiple frequency components, i.e., the carrier frequency, , and
side bands , , and, , which are slightly above and below the carrier frequency. The amplitude of the
carrier frequency depends on the value of the modulation index, , as seen in Figure 1 (for modulation index less
than 1) and Figure 2 (for modulation index greater than 1). This type of amplitude modulation that results in two
sidebands and a carrier is often called double sideband amplitude modulation (DSB-AM). Additionally, the carrier
frequency should be substantially greater than the frequency of the modulation signal. If the bandwidth of is
Hz, carrier frequency has to be greater than 2 to avoid overlap of spectra centered at and . In many real
applications, the modulation is not just a single tone but consists of multiple frequencies. Multiple frequencies in the
modulation function cause multiple sidebands to appear in the spectrum as seen in Figure 3.
3. Figure 1: Timebase and spectrum plots Figure 2: Timebase and spectrum plots
for 1 amplitude modulation. for 1 amplitude modulation.
A damaged gear tooth within a gearbox can cause
this phenomenon. The damaged tooth will produce
an amplitude modulation of its associated gear
mesh frequency each time it passes through the
mesh. That amplitude modulation occurs once per
revolution of the shaft that the damaged gear is
mounted on. When viewed in a spectrum, this
amplitude modulation shows up as a series of
spectrum lines at evenly spaced frequencies on
either side of the central gear mesh frequency.
These sidebands occur at frequencies of Figure 3: Timebase and spectrum plots of amplitude mod-
, where is the associated gear mesh ulated sine wave.
frequency, is an integer of 1 or higher (although we only use 1 - 6 in the SER calculation), and is the rota-
tional frequency of the shaft with the damaged gear. Additional harmonics of gear mesh frequencies with sideband
families of their own are also generally present in the spectrum because the waveform generated by the gear mesh is
usually not a pure sine wave. The case history in this paper presents several examples of this behavior.
Sideband Energy Ratio
SER is calculated from high resolution spectrum data. Each spectrum is created from timebase waveform data gen-
erated by an accelerometer sensor and collected by the monitoring system. Several accelerometer sensors are
mounted in strategic locations on the wind turbine gearbox to monitor each gear mesh. The waveforms from each
sensor are synchronously sampled so that the sampling frequency tracks changes in speed. This sampling technique
produces narrow spectral lines of speed dependent frequencies, like gear mesh frequencies and associated sidebands,
for variable speed machines and is essential to accurately calculate SER. Once the spectrum is generated, the SER
algorithm sums the amplitudes of the first six sideband peaks on each side of the center mesh frequency and divides
by the amplitude of the center mesh frequency.
∑ 6 1 Sideband Amplitude
i
SER (5)
Center mesh frequency amplitude
4. SER is sensitive to the sideband amplitudes relative to the center mesh frequency. For a healthy gear mesh any side-
bands will have small amplitude compared to the center mesh frequency or may be nonexistent resulting in a low
SER. The SER value is typically less than 1 for a healthy gear mesh. As damage develops on a gear tooth that passes
through the gear mesh, the sidebands will increase in amplitude as well as number resulting in a larger SER value. In
ADAPT.wind, the SER value is calculated for the first 3 harmonics of each fundamental gear mesh frequency
Case History
Several cases of gear damage were documented by
borescope inspections on 1.5MW-class wind tur-
bine generator gearboxes (See Figure 4 for general
gearbox layout). During the inspections, damage to
gear teeth on the high speed intermediate stage
shaft (HSIS) pinion was discovered and photo-
graphed. The gearboxes with this documented dam-
age were then outfitted with accelerometer sensors
and data was collected and analyzed using the Bent-
ly Nevada ADAPT.wind monitoring system. The
two case studies that follow illustrate successful
detection of the known gear damage by the SER
algorithm.
Figure 4: Gearbox Layout
Case 1: Broken HSIS Pinion Tooth
Figure 5 shows a picture of the damaged HSIS pin-
ion tooth discovered during the borescope inspec-
tion. Figures 6 and 7 display the high resolution
spectrum of the acceleration data and the accelera-
tion timebase waveform used to generate the spec-
trum. All plots were generated by the ADAPT.wind
software. In the spectrum plot of Figure 6 the first 3
harmonics of the gear mesh frequency are denoted
as 1X, 2X, and 3X respectively. The dashed lines
appearing in the plot represent the expected location
Figure 5: Case 1 HSIS pinion broken tooth
of the first six sidebands on each side of the gear
mesh 1X, 2X, and 3X center frequencies that would be associated with amplitude modulation occurring once per
turn of the HSIS shaft. The dashed lines align perfectly with amplitude peaks in the data and in fact many more than
six sidebands are present on either side of each center mesh frequency. The presence and spacing of these sidebands
in the spectrum indicates that the center mesh frequency is being amplitude modulated at the frequency of the HSIS
shaft. Furthermore, the gear mesh center frequency harmonics that the sidebands surround denote which gear mesh
the damaged gear is passing through. These two pieces of information indicate that the damaged component is pass-
ing through the intermediate stage gear mesh (the 1X, 2X, and 3X center mesh frequency lines in the spectrum be-
5. Figure 6: Case 1 spectrum showing 1X, 2X, and 3X intermediate gear mesh frequency harmonics with sidebands
spaced at HSIS shaft speed indicating HSIS pinion damage.
long to the intermediate stage gear mesh) and is
mounted on the HSIS shaft (the sidebands have a
spacing of HSIS shaft rotational speed). This diag-
nosis is also supported by the timebase waveform
plot of Figure 7 which shows amplitude modulation
occurring once per revolution of the HSIS shaft.
The SER values for the 1X, 2X, and 3X center
mesh frequencies for this gear mesh and sideband
spacing are 1.1, 3.9, and 5.6 respectively. Typically
SER values are less than 1.0 for healthy gear mesh-
es so the SER values seen here indicate a defect on
the HSIS pinion which corresponds with the dam- Figure 7: Case 1 timebase waveform showing amplitude
age depicted in Figure 5. spikes once per revolution of HSIS shaft.
Case 2: Broken HSIS Pinion Tooth
This is another example of detection of an HSIS
pinion defect inside a wind turbine gearbox. Figure
8 shows a picture of the damage present on the
HSIS pinion tooth which is very similar to the pre-
vious case. Again the timebase waveform and spec-
trum plots of acceleration data for this wind turbine
gearbox are given in Figures 9 and 10. The 1X, 2X
and 3X intermediate stage gear mesh center fre-
quency harmonics with sidebands corresponding to
amplitude modulation at HSIS shaft speed are clear-
ly visible in the spectrum. The amplitude modula-
Figure 8: Case 2 HSIS pinion broken tooth
tion can also be seen in the timebase waveform
6. occurring once per turn of the HSIS shaft. As with
the previous case, the presence and spacing of the
sidebands in the spectrum indicate that modulation
of the center mesh frequency is occurring once per
turn of the HSIS shaft. Also, the fact that the 1X,
2X and 3X center mesh frequencies belong to the
intermediate stage gear mesh indicates that the
damage causing the modulation passes through that
mesh. From this information we can diagnose that
there is damage to the HSIS pinion in this gearbox.
In this case the 1X, 2X, and 3X SER levels are 3.2,
3.5, and 6.6 respectively. These values are all well Figure 9: Case 2 timebase waveform showing amplitude
above what is typical of an undamaged gearbox spikes once per revolution of HSIS shaft.
indicating that there is an HSIS pinion defect within
this gearbox.
Figure 10: Case 2 spectrum showing 1X, 2X, and 3X intermediate gear mesh frequency harmonics with side-
bands spaced at HSIS shaft speed indicating HSIS pinion damage.
Summary and Conclusions
The SER algorithm, recently integrated into the ADAPT.wind monitoring system, is designed to target the detection
of gear related defects within a wind turbine gearbox. This is accomplished by comparing the amplitude of side-
bands to that of gear mesh center frequencies in conventional spectra. The two case studies discussed in this paper
provided an excellent test of the SER algorithm. In both cases the SER algorithm was successful in demonstrating
not only that gear damage was present within the gearbox but also exactly which gear contained the damage. The
diagnosis of HSIS pinion damage predicted by high SER values and backed up by analysis of the timebase wave-
form, is confirmed by bore scope pictures of the damage in both case studies. Timely detection and diagnosis of
developing gear defects within a gearbox is an essential part of minimizing unplanned down time of wind turbine
generators.