1) DC generators convert mechanical energy to electrical energy through Faraday's law of electromagnetic induction. When a conductor moves through a magnetic field, an EMF is induced in the conductor.
2) The main components of a DC generator are the yoke, field electromagnets, armature, commutator, and brushes. The armature is wound with coils and rotates within the magnetic field produced by the field electromagnets to generate an EMF.
3) As the armature rotates, the commutator and brushes are used to periodically reverse the direction of current in the external circuit, thereby producing direct current. Losses in the generator arise from copper, iron, and mechanical components
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
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.
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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.
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.
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.
2. D.C. GENERATORS-CONSTRUCTION & OPERATION
DC Generators
Principle of operation
Action of Commutator
Constructional details of DC Machine
Types of DC generators
EMF Equation
5. D.C. GENERATORS PRINCIPLE OF
OPERATION
DC generator converts mechanical energy into
electrical energy. when a conductor move in a magnetic
field in such a way conductors cuts across a magnetic
flux of lines and e.m.f. produces in a generator and it is
defined by faradays law of electromagnetic induction
e.m.f. causes current to flow if the conductor circuit is
closed.
6. Faradays laws
First Law :
Whenever the magnetic flux linked with a circuit changes, an e.m.f. is
always induced in it.
or
Whenever a conductor cuts magnetic flux, an e.m.f. is induced in
that conductor.
Second Law :
The magnitude of the induced e.m.f. is equal to the rate of change
of flux linkages.
7. Faradays Law of Electromagnetic Induction
A changing magnetic flux through a loop or loops of wire induces an electromotive
force (voltage) in each loop.
8. Lenz’s Law
“The induced currents in a conductor are in such a direction as to
oppose the change in magnetic field that produces them..”
“The direction of induced E.M.F in a coil (conductor) is such
that it opposes the cause of producing it..”
9. Fleming's Right Hand Rule
• The Thumb represents the direction of Motion of
the conductor.
• The First finger (four finger) represents Field.
• The Second finger (Middle finger) represents
Current
11. Are the basic requirements to be satisfied for
generation of E.M.F
1.A uniform Magnetic field
2.A System of conductors
3.Relative motion between the magnetic
field and conductors
14. Generators
Basic operation of the generator
As the loop rotates, the magnetic flux through
it changes with time
This induces an e.m.f and a current in the
external circuit
The ends of the loop are connected to slip
rings that rotate with the loop
Connections to the external circuit are made by
stationary brushes in contact with the slip rings
16. Working Principle of D.C Generator
Schematic diagram of a simple DC
Generator
1st half cycle(00 to 1800 ) Path of current
ABR1B1MLR2B2CD
2st half cycle(1800 to 3600) Path of current
DCR2B1MLB2R1BA
17. 1)Yoke
- Acts as frame of the machine
- Mechanical support
- low reluctance for magnetic flux
- High Permeability
-- For Small machines -- Cast iron—low cost
-- For Large Machines -- Cast Steel (Rolledsteel)
Large DC machine
Small DC machine
22. 2)pole cores and pole shoes
a) Pole core (Pole body) :- --Carry the field coils
--Rectangle Cross sections
-- Laminated to reduce heat losses
--Fitted to yoke through bolts
b) Pole shoe:- Acts as support to field poles
and spreads out flux
Pole core & Pole shoe are laminated of annealed steel
(Of thickness of 1mm to 0.25 mm)
23. 4)commutator
:--Hard drawn copper bars segments insulated from each
other by mica segments (insulation)
-- Between armature & External circuit
-- Split-Rings (acts like Rectifier AC to DC )
24. 5&6 Bearings and Brushes
5)Brushes and brush gear:-
Carbon, Carbon graphite, copper used to Collects current
from commutation (in case of Generator)
6)Shaft and bearings:-
Shaft-- Mechanical link between prime over and armature
Bearings– For free rotation
28. Lap Winding:
are used in machines designed for low voltage and high current
armatures are constructed with large wire because of high current
Eg: - are used is in the starter motor of almost all automobiles
The windings of a lap wound armature are connected in parallel. This
permits the current capacity of each winding to be added and provides a
higher operating current.
No of parallel path, A=P ; P = no. of poles
29.
30. Wave winding:
are used in machines designed for high voltage and low current
their windings connected in series
When the windings are connected in series, the voltage of each winding
adds, but the current capacity remains the same
are used is in the small generator.
No of parallel path, A=2,
31.
32. Commutation process in D.C Generator
Commutation is the positioning of the DC generator brushes so that the
commutator segments change brushes at the same time the armature current
changes direction.
33. The total losses in a dc machine
1.Cu losses
2.Iron losses
3.Mechanical losses
Cupper losses are mainly due to the current passing through the winding.
1.Armature cu losses (30 to 40% of full load losses)
Cu losses 2.Shunt field cu losses(20 to30% of full load losses)
3.Series field cu losses
34. 1.Cu losses
Armature cu losse s= Ia
2 Ra
Ra=Armature resistance , Ia= Armature current
--Losses due to brush contact resistance is usually include in armature cu losses
Shunt field cu losses = Ish
2Rsh
Rsh=Shunt field resistance, Ish=Shunt field current
Series field cu losses = Ise
2Rse
Rse=Series field resistance , Ise=Series field current
36. 1)Hysteresis losses (Wh)
The losses is due to the reversal of magnetisation of the armature core
Every portion of the rating core passes under N and S poles alternately. There by attaining S and N
polarity respectively. The core undergoes one complete cycle of magnetic reversal after passing
under one pair of poles.
P=No. of poles
N= Armature speed in rpm
frequency of magnetic reversals
f=NP
120
The losses depends upon the volume and B max and frequency of reversals.
Hysteresis losses is given by steinmetz formula
Wh=η B1.6
maxf V wats
V=Volume of the core in m3
η= Steinmetz hysteresis coefficient
37. 2)Eddy current losses:-(We)
when the armature core rotates, it cuts the magenetic flux hence an e.m.f
induced in in the body of the core according to faradays law of electro magnetic
induction. This e. m.f through small sets up large current in the body of the core
due to its mall resistance. This current is known as “Eddy Current”
We=k B2
maxf2t2v2 watts
Bmax=maximum flux densities
f=Freequency of the magenetic reversals
v=volume of the armaturecore
t=Thick ness of lamination
38. Efficiency of D.C Generator
Efficiency of generator is defined as the ratio of output power to input power
Efficiency (η) =output 100
input
input=output+ losses (or) output=input-losses
For D.C generator input mechanical & output electrical
39.
40. We hope our idea would benefit a lot…
Thank you!