13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- 0 0.5 1 1.5 2 2.5 3 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 x 104 Time(s) Vertical Contact Force of the Third Wheelset(N) SIMPACK Force Identified Force 0 0.5 1 1.5 2 2.5 3 -3000 -2000 -1000 0 1000 2000 3000 4000 5000 6000 Time(s) Lateral Contact Force of the Third Wheelset(N) SIMPACK Force Identified Force Figure 4. Wheel-rail vertical forces comparison Figure 5. Wheel-rail lateral forces comparison 0 0.5 1 1.5 2 2.5 3 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 Time(s) The Derailment Index of the Third Wheelset SIMPACK Derailment Index Identified Derailment Index Figure 6. Index coefficient comparison To compare the results of the SIMPACK simulation and those obtained from the inverse identification method, as shown in Figures 4-5, we can observe that the inverse forces are consistent with the simulation results. Their correlation coefficients are 0.6984 and 0.6235, respectively. By comparing the derailment index, it can be found that the tendencies of the result are also quite accordant. 5. Conclusion A non-iterative recurrence algorithm for input estimation algorithm mathematical model has been established. Combined with Tikhonovo regularization algorithm, anti-noise ability of the inversion model is enhanced. Based on the response of the accelerations, the method can be applied to the estimation of vertical and lateral contact forces for an operating rail vehicle. (1)The inversion model is verified by the experiment data of the laboratory test. Using some parts of accelerations which are measured from the rolling and vibrating test-bed to identify the other component of accelerations, and compare with laboratory tests. The results show that the inversion model can be used to identify the unknown output responses for interesting places. (2) From the time domain, the comparison of the vertical and lateral contact forces results between inverse and SIMPACK models are given. The results show that, the inverse mathematical model has high relatively precision for inversing the wheel/rail contact forces of operation
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