| Title | Computational Methods to Predict Railcar Response to Track Cross-Level Variations |
|---|---|
| Record ID | 48469 |
| Personal Name Creator |
Platin, B. E.; Beaman, J. J.; Hedrick, J. K.; Wormley, D. N. |
| Source | 86p. in various pagings |
| Corporate Creator | Massachusetts Institute of Technology |
| Corporate Contributor |
John A. Volpe National Transportation Systems Center (U.S.); United States. Department of Transportation. Federal Railroad Administration |
| Publisher | John A. Volpe National Transportation Systems Center (U.S.) |
| Publication Date | 19760900 |
| Language | English |
| Abstract | The rocking response of railroad freight cars to track cross-level variations is studied using: (1) a reduced complexity digital simulation model, and (2) a quasi-linear describing function analysis. The reduced complexity digital simulation model employs a rail truck model that neglects the high-frequency dynamics of the bolster and wheelset masses, yet includes kinematic center plate, side bearings, and wheelset nonlinear effects. This model has computation-time requirements that are less than one eighth those of more detailed computer simulation models and agrees within 15% percent for the prediction of roll angle, side bearing force, center plate force and wheel force at maximum roll angle response with the more detailed models. A study of quasi-linear describing function techniques to compute the steady-state response of freight cars to equivalent sinusoidal cross-level track variations has demonstrated the feasibility of the technique for the types of nonlinearities important in car response. This technique, which computes steady-state response from a set of nonlinear algebraic equations rather than by numerical integration, is effective for parametric studies in which a series of the responses is required as a parameter is varied incrementally since once the solution is obtained for one set of parameter values, additional responses for an incremental change in the parameter are obtained efficiently. |
| Rosap ID | dot:10094 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/10094 |
| TRT Terms | Train track dynamics; Rolling; Defects; Dynamic tests; Mathematical models; Ride quality; Rocking; Simulation |
| General Subjects | Railcar rock and roll; Computational methods; Dynamic analysis |
| Classification | AGR - SAFETY AND SECURITY - SAFETY AND SECURITY; NTL - RAIL TRANSPORTATION - Rail Safety; NTL - RAIL TRANSPORTATION - RAIL TRANSPORTATION; NTL - SAFETY AND SECURITY - SAFETY AND SECURITY; NTL - SAFETY AND SECURITY - Rail Safety |
| Geographical Coverage |
United States |
| Contract Number | DOT-TS-11201; RR619/R6365 |
| Report Number | DOT-TSC-FRA-76-13; FRA-OR&D-76-293 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | In Book |
| URL | https://ntlrepository.blob.core.windows.net/lib/48000/48400/48469/DOT-TSC-FRA-76-13.pdf |
| Format | |
| Database | NTL Digital Repository |