Modal Frequency Optimization Method for Long Flat Vehicle Body Steel Structure
In order to solve low-value problem of modal frequency for the long flat vehicle,research on improving the low-order vibration frequency value is carried out based on the sensitivity analysis method and relying on the optimal design mathematical model.Firstly,the finite element model of the long flat vehicle is established,and the unconstrained mode of the vehicle body under the state of the steel structure is calculated.Then the sensitivity analysis method is used to calculate the first-order sag frequency and the sensitivity of the vehicle body mass to the thickness of each component in the vehicle body loading reinforcement device.Then,based on the relative sensitivity obtained from a single response sensitivity correlation,combined with the influence of different sensitivity thresholds on the optimization cost and optimization effect of the vehicle body structure,it is finally determined that the thickness of the 17 components such as the middle beam and the end beam of the loading reinforcement device is used as the design variable.The maximum value of the vertical bending vibration frequency is the optimization target to optimize the vehicle body structure.The results show that after optimization,the first-order sag frequency of the vehicle body is increased by 4.51%,the body mass is reduced by 5.34%,and the vehicle body strength has no significant change.
long flat vehiclemodal analysissensitivity analysissensitivity thresholdsize optimization
万方数据
维普
