Design Of Structural Dynamic Optimization Of Field Medical Vehicle

Based on the development of field medical vehicle in the nation, this thesis is probed into the method of design of structural dynamic optimization that based on the finite element method. As an example of WCY2000 field ambulance, the parameter optimization of the vehicle's body and the stretcher are completed, which indicate that the effective finite element method can be applicable for design and manufacture of field medical vehicle.The finite element models of the field ambulance's frame, body and stretcher are established. The finite element model of the frame is established separately by using shell element and plane element. The static and dynamic analysis is done. It is proved that the shell element has higher precision than plane element when the modal frequency is below 40Hz, the calculation errors are below 1.05%. The element model DOM number for the laminated plate such as the vehicle body established by linear layer element is less 66% than by four nodes plane element, the calculation errors are below 2.74%.The finite element model of vehicle whole body is built and the method of the load files made are carried out firstly in the domain of the field medical vehicle. The spectrum analysis of the whole vehicle finite element model under road exciting is implemented. By comparing the results of test with the results of simulations, the correlation coefficient of the results are above 0.89, the normal differences ofacceleration response is below 0.144 m / s2.The optimization of the body and the stretcher is carried out and the accelerationresponses of the vehicle and the new vehicle are found. The spectrum analysis results show that the optimization plan has the lowest response. The max response can reduces to 44.3%. The Newmark method and modal superposition method are compared. It is found that the former has higher efficiency for the vehicle modal over 93%.