| Popis: |
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. |
