PRFORMANCE LIMITS OF RAIL PASSENGER VEHICLES: STABILITY/CURVING TRADE-OFFS AND MODEL VALIDATION
The dynamic performance capabilities of conventional and radial (both self and forced steering) passenger trucks are investigated with respect to lateral stability and curve negotiation. There always exists an inherent trade-off between good stability and curving performance. The individual truck designs are optimized and then compared to one another to determine the performance benefits of the radial design. It is shown that the self steering radial truck can be designed for higher critical speed due to the decoupling of the truck mass from the wheelsets and that it can also be designed to exhibit lower flanging forces on tight curves due to the higher truck shear stiffness capability of the self-steering truck. A forced steering truck differs from the self-steering radial truck in that linkages are used between the carbody and wheelsets to force the wheelsets into radial alignment. It is shown that these linkages provide superior curving performance on tight curves, however, care must be taken to avoid kinematic instabilities. Experimental data obtained from the recent AMTRAK/FRA/GSI test program at the USDOT Transportation Test Center is used to validate the tangent track stability and ride quality models used in this report. Excellent agreement with the experimental data was obtained from .5 to 10 Hz.
Massachusetts Institute of TechnologyDepartment of Mechanical Engineering
Cambridge, MA United States 02139
Department of Transportation1200 New Jersey Avenue, SE
Washington, DC United States 20590
- Hedrick, J Karl
- Wormley, D N
- Horak, D
- Bell, C
- Gilan, A
- Publication Date: 1981-10-1
- Pagination: 360 p.
- TRT Terms: Car trucks (Railroads); Dynamic tests; Passenger cars; Ride quality; Steering; Vehicle design
- Identifier Terms: Amtrak; Transportation Technology Center; U.S. Department of Transportation
- Uncontrolled Terms: Dynamic analysis; Lateral dynamics
- Old TRIS Terms: Ost university research; Passenger car design; Radial trucks
- Subject Areas: Design; Public Transportation; Railroads; Vehicles and Equipment;
- Accession Number: 00396551
- Record Type: Publication
- Report/Paper Numbers: DOT/OST/P-34/85-014 Final Rpt.
- Contract Numbers: DOT-OS-70052
- Files: TRIS, USDOT
- Created Date: Sep 30 1985 12:00AM