The document summarizes Rahul Singh's seminar presentation on reliability. It defines reliability as the ability of a product to perform as expected over time, with a probability between 0 and 1 under specified conditions. There are two types of failures: functional and reliability. Reliability is measured through failure rate and other metrics. Products go through debugging, chance failure, and wear-out phases as shown in the bathtub curve. Exponential and Weibull distributions model failure rates. System reliability depends on components arranged in series, parallel or both. Life testing plans include failure-terminated, time-terminated and sequential tests.
This is a presentation to the top management as to why reliability is important and what is the difference between a maintenance engineer and a reliability engineer.
This seminar session provides an overview of major aspects of reliability engineering, including general introduction of reliability engineering (definition of reliability, function of reliability engineering, a brief history of reliability, etc.), reliability basics (metrics used in reliability, commonly-used probability distributions in reliability, bathtub curve, reliability demonstration test planning, confidence intervals, Bayesian statistics application in reliability, strength-stress interference theory, etc.), accelerated life testing (ALT) (types of ALT, Arrhenius model, inverse power law model, Eyring model, temperature-humidity model, etc.), reliability growth (reliability-based growth models, MTBF-based growth model, etc.), systems reliability & availability (reliability block diagram, non-repairable or repairable systems, reliability modeling of series systems, parallel systems, standby systems, and complex systems, load sharing reliability, reliability allocation, system availability, Monte Carlo simulation, etc.), and degradation-based reliability (introduction of degradation-based reliability, difference between traditional reliability and degradation-based reliability, etc.).
Probability that a product, piece of equipment, or system will perform its intended function for a stated period of time under specified operating conditions.
This is a presentation to the top management as to why reliability is important and what is the difference between a maintenance engineer and a reliability engineer.
This seminar session provides an overview of major aspects of reliability engineering, including general introduction of reliability engineering (definition of reliability, function of reliability engineering, a brief history of reliability, etc.), reliability basics (metrics used in reliability, commonly-used probability distributions in reliability, bathtub curve, reliability demonstration test planning, confidence intervals, Bayesian statistics application in reliability, strength-stress interference theory, etc.), accelerated life testing (ALT) (types of ALT, Arrhenius model, inverse power law model, Eyring model, temperature-humidity model, etc.), reliability growth (reliability-based growth models, MTBF-based growth model, etc.), systems reliability & availability (reliability block diagram, non-repairable or repairable systems, reliability modeling of series systems, parallel systems, standby systems, and complex systems, load sharing reliability, reliability allocation, system availability, Monte Carlo simulation, etc.), and degradation-based reliability (introduction of degradation-based reliability, difference between traditional reliability and degradation-based reliability, etc.).
Probability that a product, piece of equipment, or system will perform its intended function for a stated period of time under specified operating conditions.
This is a three parts lecture series. The parts will cover the basics and fundamentals of reliability engineering. Part 1 begins with introduction of reliability definition and other reliability characteristics and measurements. It will be followed by reliability calculation, estimation of failure rates and understanding of the implications of failure rates on system maintenance and replacements in Part 2. Then Part 3 will cover the most important and practical failure time distributions and how to obtain the parameters of the distributions and interpretations of these parameters. Hands-on computations of the failure rates and the estimation of the failure time distribution parameters will be conducted using standard Microsoft Excel.
Part 1. Reliability Definitions
1.Reliability---Time dependent characteristic
2.Failure rate
3.Mean Time to Failure
4.Availability
5.Mean residual life
Authors: (i) Prashanth Lakshmi Narasimhan,
(ii) Mukesh Ravichandran
Industry: Automobile -Auto Ancillary Equipment ( Turbocharger)
This was presented after the completion of our 2 months internship at Turbo Energy Limited during our 3rd Year Summer holidays (2013)
How do you use the Weibull Distribution? It’s just one of many useful statistical distribution we have to master as reliability engineers. Let’s explore an array of distribution and the problems they can help solve in our day to day work.
Detailed Information: When confronted with a set of time to failure data, what is your goto analysis approach. For me it’s a Weibull plot. It’s quick, often provides some insight to ask better questions, and easy to explain to others. A histogram is another great starting point. If we know a little about the source of the data, we may favor the normal or lognormal distributions. If discreet data, then binomial is the first choice, yet Poisson or hypergeometric have uses, too. A basic understanding of statistical distributions provides you a way to summarize data providing insights to identify or solve problems. In this webinar we’ll explore a few distributions useful for reliability engineering work and talk about how to select a distribution, basics on interpreting distributions and just touch on judging if you have selected the right distribution.
This Accendo Reliability webinar originally broadcast on 14 April 2015.
This is a three parts lecture series. The parts will cover the basics and fundamentals of reliability engineering. Part 1 begins with introduction of reliability definition and other reliability characteristics and measurements. It will be followed by reliability calculation, estimation of failure rates and understanding of the implications of failure rates on system maintenance and replacements in Part 2. Then Part 3 will cover the most important and practical failure time distributions and how to obtain the parameters of the distributions and interpretations of these parameters. Hands-on computations of the failure rates and the estimation of the failure time distribution parameters will be conducted using standard Microsoft Excel.
Part 3. Failure Time Distributions
1.Constant failure rate distributions
2.Increasing failure rate distributions
3.Decreasing failure rate distributions
4.Weibull Analysis – Why use Weibull?
Weibull Analysis is an important tool for Reliability Engineering. It can be used verifying the design life at component level, comparing two designs and warranty analysis.
System reliability and types of systems in machine designVikasSuroshe
This presentation gives brief description about, What is system reliability, types of systems. The points discussed are: System, Calculating Reliability Factor for System, System Configurations Types, Series Configuration, Parallel Configuration (Redundant System), Mixed Configuration (Combine Series-Parallel System), Reliability Block Diagram, Reliability Considerations, Advantages and Disadvantages of various configurations etc.
Achieving high product reliability has become increasingly vital for manufacturers in order to meet customer expectations amid the threat of strong global competition. Poor reliability can doom a product and jeopardize the reputation of a brand or company. Inadequate reliability also presents financial risks from warranty, product recalls, and potential litigation. When developing new products, it is imperative that manufacturers develop reliability specifications and utilize methods to predict and verify that those reliability specifications will be met. This 4-Hour course provides an overview of quantitative methods for predicting product reliability from data gathered from physical testing or from field data
You’ve heard about Weibull Analysis, and want to know what it can be used for, OR you’ve used Weibull Analysis in the past, but have forgotten some of the background and uses….
This webinar looks at giving you the background of Weibull Analysis, and its use in analyzing failure modes. Starting from basics and giving examples of its uses in answering the questions:
• How many do I test, for how long?
• Is our design system wrong?
• How many more failures will I have in the next month, year, 5 years?
Sit in and listen and ask your questions … not detailed “How to” but “When & Why to”!
Objectives
To understand Weibull distribution
To be able to use Weibull plot for failure time analysis and
diagnosis
To be able to use software to do data analysis
Organization
Distribution model
Parameter estimation
Regression analysis
This is a three parts lecture series. The parts will cover the basics and fundamentals of reliability engineering. Part 1 begins with introduction of reliability definition and other reliability characteristics and measurements. It will be followed by reliability calculation, estimation of failure rates and understanding of the implications of failure rates on system maintenance and replacements in Part 2. Then Part 3 will cover the most important and practical failure time distributions and how to obtain the parameters of the distributions and interpretations of these parameters. Hands-on computations of the failure rates and the estimation of the failure time distribution parameters will be conducted using standard Microsoft Excel.
Part 1. Reliability Definitions
1.Reliability---Time dependent characteristic
2.Failure rate
3.Mean Time to Failure
4.Availability
5.Mean residual life
Authors: (i) Prashanth Lakshmi Narasimhan,
(ii) Mukesh Ravichandran
Industry: Automobile -Auto Ancillary Equipment ( Turbocharger)
This was presented after the completion of our 2 months internship at Turbo Energy Limited during our 3rd Year Summer holidays (2013)
How do you use the Weibull Distribution? It’s just one of many useful statistical distribution we have to master as reliability engineers. Let’s explore an array of distribution and the problems they can help solve in our day to day work.
Detailed Information: When confronted with a set of time to failure data, what is your goto analysis approach. For me it’s a Weibull plot. It’s quick, often provides some insight to ask better questions, and easy to explain to others. A histogram is another great starting point. If we know a little about the source of the data, we may favor the normal or lognormal distributions. If discreet data, then binomial is the first choice, yet Poisson or hypergeometric have uses, too. A basic understanding of statistical distributions provides you a way to summarize data providing insights to identify or solve problems. In this webinar we’ll explore a few distributions useful for reliability engineering work and talk about how to select a distribution, basics on interpreting distributions and just touch on judging if you have selected the right distribution.
This Accendo Reliability webinar originally broadcast on 14 April 2015.
This is a three parts lecture series. The parts will cover the basics and fundamentals of reliability engineering. Part 1 begins with introduction of reliability definition and other reliability characteristics and measurements. It will be followed by reliability calculation, estimation of failure rates and understanding of the implications of failure rates on system maintenance and replacements in Part 2. Then Part 3 will cover the most important and practical failure time distributions and how to obtain the parameters of the distributions and interpretations of these parameters. Hands-on computations of the failure rates and the estimation of the failure time distribution parameters will be conducted using standard Microsoft Excel.
Part 3. Failure Time Distributions
1.Constant failure rate distributions
2.Increasing failure rate distributions
3.Decreasing failure rate distributions
4.Weibull Analysis – Why use Weibull?
Weibull Analysis is an important tool for Reliability Engineering. It can be used verifying the design life at component level, comparing two designs and warranty analysis.
System reliability and types of systems in machine designVikasSuroshe
This presentation gives brief description about, What is system reliability, types of systems. The points discussed are: System, Calculating Reliability Factor for System, System Configurations Types, Series Configuration, Parallel Configuration (Redundant System), Mixed Configuration (Combine Series-Parallel System), Reliability Block Diagram, Reliability Considerations, Advantages and Disadvantages of various configurations etc.
Achieving high product reliability has become increasingly vital for manufacturers in order to meet customer expectations amid the threat of strong global competition. Poor reliability can doom a product and jeopardize the reputation of a brand or company. Inadequate reliability also presents financial risks from warranty, product recalls, and potential litigation. When developing new products, it is imperative that manufacturers develop reliability specifications and utilize methods to predict and verify that those reliability specifications will be met. This 4-Hour course provides an overview of quantitative methods for predicting product reliability from data gathered from physical testing or from field data
You’ve heard about Weibull Analysis, and want to know what it can be used for, OR you’ve used Weibull Analysis in the past, but have forgotten some of the background and uses….
This webinar looks at giving you the background of Weibull Analysis, and its use in analyzing failure modes. Starting from basics and giving examples of its uses in answering the questions:
• How many do I test, for how long?
• Is our design system wrong?
• How many more failures will I have in the next month, year, 5 years?
Sit in and listen and ask your questions … not detailed “How to” but “When & Why to”!
Objectives
To understand Weibull distribution
To be able to use Weibull plot for failure time analysis and
diagnosis
To be able to use software to do data analysis
Organization
Distribution model
Parameter estimation
Regression analysis
Availability is a performance criterion for repairable systems that accounts for both the reliability and maintainability properties of a component or system. It is defined as the probability that the system is operating properly when it is requested for use
Measurement and Evaluation of Reliability, Availability and Maintainability o...IOSR Journals
The growing complexity of equipments and systems often lead to failures and as a consequence the
aspects of reliability, maintainability and availability have come into forefront. The failure of machineries and
equipments causes disruption in production resulting from a loss of availability of the system and also increases
the cost of maintenance. The present study deals with the determination of reliability and availability aspects of
one of the significant constituent in a Railway Diesel Locomotive Engine. In order to assess the availability
performance of these components, a broad set of studies has been carried out to gather accurate information at
the level of detail considered suitable to meet the availability analysis target. The Reliability analysis is
performed using the Weibull Distribution and the various data plots as well as failure rate information help in
achieving results that may be utilized in the near future by the Railway Locomotive Engines for reducing the
unexpected breakdowns and will enhance the reliability and availability of the Engine. In this work, ABC
analysis has been used for the maintenance of spare parts inventory. Here, Power pack assemblies, Engine
System are used to focus on the reliability, maintainability and availability aspects
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
2. RELIABILITY
Generally defined as the ability of a product to perform as expected over time.
Formally defined as the probability that a product, piece of equipment, or system
performs its intended function for a stated period of time under specified
operating conditions.
Although no product is expected to last forever, the time requirement ensures
satisfactory performance over at least a minimal stated period.
3. RELIABILITY
Four aspects of reliability are apparent from this definition:
• Reliability is a probability-related concept; the numerical value of this
probability is between 0 and 1.
• The functional performance of the product has to meet certain stipulations.
• Reliability implies successful operation over a certain period of
time.
• Operating or environmental conditions under which product use takes place are
specified.
4. Types of Failures
Functional failure – failure that occurs at the start of product life due to
manufacturing or material detects.
Reliability failure – failure after some period of use.
5. RELIABILITY
Types of Reliability
1) Inherent reliability – predicted by product design.
2) Achieved reliability – observed during use.
Reliability Measurement
1) Failure rate – number of failures per unit time.
2) Alternative measures
a) Mean time to failure
b) Mean time between failures
6. LIFE-CYCLE CURVE
Most products go through three distinct phases from product inception to wear-
out.
1. The debugging phase,
2. The chance-failure phase, and
3. The wear-out phase
Figure 1 shows a typical life-cycle curve for which the failure rate is plotted as a
function of time. This curve is often referred to as the bathtub curve.
7.
8. LIFE-CYCLE CURVE
The debugging phase, also known as the infant-mortality phase, exhibits a drop in
the failure rate as initial problems identified during prototype testing are ironed
out.
The chance failure phase, between times t1 and t2, is then encountered; failures
occur randomly and independently. This phase, in which the failure rate is constant,
typically represents the useful life of the product.
Following this is the wear-out phase, in which an increase in the failure rate is
observed. Here, at the end of their useful life, parts age and wear out.
9. Probability Distributions to Model Failure
Rate
Exponential Distribution :
The life-cycle curve shows the variation of the failure rate as a function of time.
For the chance-failure phase, which represents the useful life of the product, the
failure rate is constant.
As a result, the exponential distribution can be used to describe the time to failure
of the product for this phase.
10. Exponential Distribution
The exponential distribution have a probability density function given by:
The reliability at time t, R(t), is the probability of the product lasting up to at least
time t. It is given by:
11.
12. Example
An amplifier has an exponential time-to-failure distribution with a failure rate of 8%
per 1000 hours. What is the reliability of the amplifier at 5000hours? Find the mean
time to failure?
Solution:
13. Weibull Distribution
Weibull Distribution :
The Weibull distribution is used to model the time to failure of products that have
a varying failure rate.
It is therefore a candidate to model the debugging phase (failure rate decreases
with time), or the wear-out phase (failure rate increases with time).
The Weibull distribution is a three-parameter distribution whose density function is
given by:
14. Weibull Distribution
The reliability function for the Weibull distribution is given by
The mean time to failure, as given by
The failure-rate function r(t) for the Weibull time-to-failure probability distribution
is
15. Weibull Distribution
Figure shows the shape of the failure-rate function for the Weibull failure density function, for values of the parameter ß of 0.5, 1, and 3.5.
16. Example
Capacitors in an electrical circuit have a time-to-failure distribution that can be
modeled by the Weibull distribution with a scale parameter of 400 hours and a
shape parameter of 0.2. What is the reliability of the capacitor after 600 hours of
operation? Find the mean time to failure. Is the failure rate increasing or decreasing
with time?
Solution:The parameters of the Weibull distribution are a = 400 hours and ß = 0.2. The
location parameter ã is 0 for such reliability problems. The reliability after 600 hours of
operation is given by
17. Example
This function decreases with time. It would model components in the debugging
phase.
18. SYSTEM RELIABILITY
Most products are made up of a number of components. The reliability of each
component and the configuration of the system consisting of these components
determines the system reliability (i.e., the reliability of the product).
Systems with Components in Series
Systems with Components in Parallel
Systems with Components in Mix Configuration
19. Systems with Components in Series
It is assumed that the components operate independent of each other.
In general, if there are n components in series, where the reliability of the ith
component is denoted by Ri, the system reliability is
Rs = R1 x R2 x ... X Rn
20. Systems with Components in Series
The system reliability decreases as the number of components in series increases.
Although overdesign in each component improves reliability, its impact would be
offset by the number of components in series.
Moreover, manufacturing capabilities and resource limitations restrict the
maximum reliability of any given component.
Product redesign that reduces the number of components in series is a viable
alternative.
21. Systems with Components in Parallel
System reliability can be improved by placing components in parallel. The
components are redundant; the system operates as long as at least one of the
components operates.
The only time the system fails is when all the parallel components fail.
All components are assumed to operate simultaneously.
Examples of redundant components placed in parallel to improve the reliability of
the system abound. For instance, the braking mechanism is a critical system in the
automobile. Dual subsystems thus exist so that if one fails, the brakes still work
22.
23. Systems with Components in Parallel
Suppose that we have n components in parallel, with the reliability of the ith
component denoted by Ri=1, 2, ..., n. Assuming that the components operate
randomly and independently of each other, the probability of failure of each
component is given by
Fi = 1 - Ri
Now, the system fails only if all the components fail. Thus, the probability of system
failure is
24. Systems with Components in Parallel
The reliability of the system is the complement of Fs and is given by
25. Systems with Components in Series and in
Parallel
Complex systems often consist of components that are both in series and in
parallel.
Reliability calculations are based on the concepts discussed previously, assuming
that the components operate independently.
26. RELIABILITY AND LIFE TESTING PLANS
Plans for reliability and life testing are usually destructive in nature. They involve
observing a sample of items until a certain number of failures occur, observing over
a certain period of time to record the number of failures, or a combination of both.
Such testing is usually done at the prototype stage, which can be expensive
depending on the unit cost of the item.
Testing is usually conducted under simulated conditions, but it should mimic the
actual operating conditions as closely as possible.
27. Types of Tests
1. Failure-Terminated Test
In failure-terminated plans, the tests are terminated when a preassigned number of
failures occurs in the chosen sample. Lot acceptance is based on the accumulated
test time of the items when the test is terminated. One acceptance criterion
involves whether the estimated average life of the item exceeds a stipulated value.
2. Time-Terminated Test
A time-terminated test is terminated when a preassigned time T is reached.
Acceptance of the lot is based on the observed number of failures r during the test
time. If the observed number of failures f exceeds a preassigned value r, the lot is
rejected; otherwise, the lot is accepted.
28. Types of Tests
3. Sequential Reliability :Test In sequential reliability testing, no prior decision is
made as to the number of failures or the time to conduct the test. Instead, the
accumulated results of the test are used to decide whether to accept the lot, reject
the lot, or continue testing.