Partial coherence method of transfer functions on structural vibration under correlated excitations

Aim at the causality and priority of inputs in the vibration system of multi-inputs and multi-outputs, a new method has been proposed based on the comparison between calculated value and true value of transfer function. By comparing the value of transfer function between inputs and outputs, the causality of inputs and priority of causal correlated inputs can be distinguished directly. The method has been verified by simulation and experiment on an automobile chassis. Simulation analysis shows effectiveness of the method. The partial coherence approach has been able to analyze the relations successfully between the correlated inputs and outs of automobile classis based on the new method. Experiment and simulation results are consistent. Calculation of the actual contribution of each input to the outputs in the correlated frequency are also presented. © Krishtel eMaging Solutions Private Limited 2011.