Closure to “Discussions of ‘Digital Computer Simulation of Railroad Freight Car Rocking’” (1968, ASME J. Eng. Ind., 90, pp. 706–707)

1968 ◽  
Vol 90 (4) ◽  
pp. 707-707
Author(s):  
A. A. Liepins
Keyword(s):  
Computer Simulation ◽  
Digital Computer ◽  
Freight Car ◽  
Railroad Freight

Digital Computer Simulation of Railroad Freight Car Rocking

1968 ◽  
Vol 90 (4) ◽  
pp. 701-706 ◽  
Author(s):  
A. A. Liepins
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Computer Program ◽  
Digital Computer ◽  
Test Results ◽  
Model Response ◽  
Freight Car ◽  
Railroad Freight

A mathematical model for the simulation of railroad freight car rocking is presented. The equations of the model are developed into a digital computer program. The model response is validated by two series of test results, and the model is considered reliable for engineering predictions.

Dynamic Rocking Response and Optimization of the Nonlinear Suspension of a Railroad Freight Car

1980 ◽  
Vol 102 (1) ◽  
pp. 86-93 ◽  
Author(s):  
M. Samaha ◽  
T. S. Sankar
Keyword(s):  
Equations Of Motion ◽  
Sine Wave ◽  
Optimization Techniques ◽  
Model Accuracy ◽  
Frequency Responses ◽  
Optimum Parameters ◽  
Freight Car ◽  
Six Degree Of Freedom ◽  
Railroad Freight ◽  
Rocking Response

A modified mathematical model of a large capacity railroad freight vehicle is presented. The model for this investigation is constructed in such a way to describe the bounce, sway and rocking modes of the system and also to account for most of the vehicle non-linearity effects. Equations of motion of the six degree of freedom nonlinear model are derived assuming that the excitations from the track in vertical and lateral directions are purely periodic in the form of a rectified sine wave. The solution for the time and frequency responses on digital computer are compared with available measured data to investigate the model accuracy. Multivariable optimization techniques are employed to find the optimum suspension parameters that minimizes the maximum car rocking response over the frequency range of interest. The optimum parameters are presented in different forms either for the existing or for stabilized vehicle configuration.

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