Identification of abnormal loads between carbody and hanging equipment of high speed train using inverse method

The ability to effectively identify abnormal loads caused by hanging equipment local resonance problems is important for assessing the structural integrity of railway vehicles. The structural dynamics inverse problems analysis method is presented to minimise resonance effects and equipment-underframe interactions at different structural frequencies. A mathematical model of the structure forward and inverse dynamics is developed to simulate such interactions based on multibody system dynamics and finite elements theory. The Euler-Bernoulli beam model is also used to simulate the flexible carbody integrated with the inverse approach to compare the effects of reconstructed loads utilised by the optimised regularisation algorithm. The vehicle rolling vibration rig test is made to verify the identification effects. The results are found to be in good agreement with the predictions of the mathematical model using the measured acceleration and demonstrated the effectiveness and non-destructive test applicability.