RESEARCH DESIGN and STANDARD ORGANISATION
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ELECTRO-PNEUMATIC ASSISTED BRAKE SYSTEM
Special Features of Electro Pneumatic Assisted Brake system Test
Advantages of EP Brake System over Conventional Brake System
RESEARCH DESIGN and STANDARD ORGANISATION
Railways were introduced in India in 1853. To enforce standardization and co-ordination amongst various railway systems, the Indian Railway Conference Association (IRCA) was set up in 1903, followed by the Central Standards Office (CSO) in 1930, for preparation of designs, standards and specifications. With Independence and the resultant phenomenal increase in country’s industrial and economic activity, a new organization called Railway Testing and Research Centre (RTRC) was setup in 1952 at Lucknow.
Central Standards Office (CSO) and the Railway Testing and Research Centre (RTRC) were integrated into a single unit named Research Designs and Standards Organization (RDSO) in 1957, under Ministry of Railways. at Lucknow
ORGANISATION :
RDSO comprises of 19 DERECTRATES headed by a Director General. The Director General is assisted by Additional Director General, Sr. Executive Directors and Executive Directors, heading different directorates. They are:
Bridges & structures Carriage
Defence Research Electrical Loco
EMU & Power Supply Engine Development
Finance & Accounts GEO - Technical Engineering
Quality Assurance Metallurgical & Chemical
Motive Power Psycho-technical
Research Signal
Telecommunication Track Testing
Track Machines & Motoring Traction Installation
Traffic Wagon
All the directorates of RDSO except Defence Research are located at Lucknow
QUAITY POLICY & FUNCTIONS
is to develop safe, modern and cost effective Railway technology complying with Statutory and Regulatory requirements, through excellence in Research &Quality Management System, etc….
Its objectives are:-
Safety: Development of crashworthy design of coaches for enhanced safety of passengers. High Speed Self Propelled Accident Relief Train for faster travel to accident site, Indigenous Electronic interlocking system, Fire-retardant coaches. Computerized psychological test package for railways, & Train Actuated Warning Device (TAWD).
Traffic growth: Development of 3-phase high staring torque traction motor for WAG-9/WAP-7 locomotives. Design of BCNH wagon with shorter length as compared to BCNA for increasing rake throughput for covered wagons.
FUNCTIONS:
RDSO is the sole R&D organization of Indian Railways and functions as the technical advisor to Railway Board, Zonal Railways and Production Units and performs the following important functions :
Development of new and improved designs.
Development, adoption, absorption of new technology for use on Indian Railways.
Development of standards for materials and products specially needed by Indian Railways.
Technical investigation, statutory clearances, testing and providing consultancy services.
Inspection of critical and safety items of rolling stock, locomotives, signaling & telecommunication equipment and track components.
INSTRUMENTS
Role of transducer in E. Lab
Transducer is a device which, when actuated by energy in one transmission system, supplies energy in the same form or in other form to a second transmission system. This energy transmission may be Electrical, Mechanical, Chemical, Optical or Thermal.
TYPE OF TRANSDUCERS
1) Electrical
2) Mechanical
BASIC REQUIREMENT OF ELECTRICAL TRANSDUCERS:
Ruggedness : ability to Withstand overload
Linearity : Ability to reproduce input-output characteristics symmetrically and linearly .
Repeatability : Ability to reproduce an output signal exactly.
Stability and Reliability : High & unaffected by Temperature, vibration, and other environmental conditions .
Good Dynamics Response
Convenient Instrumentation
LVDT
LVDT (Linear Variable Displacement Transducer):
Precision of LVDT
Movements as small as a few millionths of an inch
Usually measurements are taken on the order of ±12 inches
Some LVDT’s have capabilities to measure up to ±20 inches
Inner Structure
STRAIN GAUGE
Track Side Bogie Monitoring System
Sensors for Detecting Hot boxes and Hot Wheels
Most derailments can be traced to either the failure of wheel bearings or brake binding. Both conditions lead to overheating followed by seizure which in turn can cause wheel flats, track damage and derailment. Hot Axle and Box Detection systems are used globally for the purpose. These rely on remote measurement of temperatures of the bearing boxes and the wheels.
Proximity Sensors
AIR BRAKE LAB
COMPONENTS OF AN AIR BRAKE SYSTEM:
Compressor:

The compressor generates the compressed air for the whole system.
Reservoir:
The compressed air from the compressor is stored in the reservoir.
Unloader Valve:
This maintains pressure in the reservoir at 8bar.When the pressure goes above 8 bar it immediately releases the pressurized air to bring the system to 8-bar pressure.
Air Dryer:
This removes the moisture from the atmospheric air and prevents corrosion of the reservoir.
WORKING OF AN AIR BRAKING SYSTEM
BASIC ALGORITHM
TESTING PROCEDURE IN AIR BRAKE LAB:

Initial charging time of Coach/Wagon Rack.
Leakage test of Coach/wagon rack at 0.25kg/cm²
Brake Application & Release timing as per Test Scheme
Air Propagation rate of Rack for Application time & Release time.
ELECTRO-PNEUMATIC ASSISTED BRAKE SYSTEM
Special Features of Electro Pneumatic Assisted Brake system Test Rig:-
EP Assist Brake System Test Rig can simulate a twin pipe graduated application and graduated release in 30 coach train formation. 
Simultaneous Application and Release of brakes in EP Assist mode in the entire 30 coach or in the number of selected coaches.
Reduces the braking application and release timing in comparison to Conventional Brake System.
Touch Panel based User Interface.
Testing can be done in 3 modes
- Automatic
-Semi Automatic
-Manual
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