Stress Spectrum Analysis of Random Vibration of Vehicle Frame Based on Virtual Excitation Method

Abstract

<jats:p>To determine the stress spectra of a vehicle frame under random road excitations, A mathematical model was been established using the Euler-Bernoulli beam elements and spring-damper elements for the multiple-degree-of-freedom (MDOF) vibration of the vehicle frame with a finite element method, and adopted a virtual excitation method to construct virtual road excitations based on four points, i.e., front and rear wheels, thus we offered a method for calculating the statistical characteristic of the random vibration response of the vehicle frame based on the virtual excitation method, and realized stress spectrum analysis of the random vibration of the vehicle frame. The results show that combining the virtual excitation method and the finite element method for random vibration analysis, maintained the theoretical precision and greatly simplified the calculation , thus provided a feasible way for stress spectrum calculation in fatigue analysis of a vehicle frame under random excitations.</jats:p>

Experimental study and dynamic performance analysis of a metro vehicle

“…In recent decades, researchers in various regions at home and abroad have done a lot of experimental and theoretical simulation analysis on the vibration problem of rail vehicles, and accumulated a lot of experience by combining theory and test, which has laid a solid foundation for future research by researchers [1][2][3] .Historical researchers have developed relevant evaluation indexes for vibration evaluation of vehicle running quality, such as ISO vibration standard, which has been referred to by scientific researchers in various regions and countries around the world since its launch. Later, the UIC comfort index was obtained, which was mainly obtained from the weighted mean square value of vehicle vibration acceleration, and the Sperling index, which was consistent with this method, was also used to evaluate stable operation [3][4][5][6][7] .…”