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The shock stiffness of rubber vibration isolators of different sizes but the same type is experimentally studied by light gas cannon and their relationships are presented. The performance of the shock resistance of rubber isolators is also analyzed.

In order to analyze air spring’s characteristic numerically, multi-step method is presented to establish its finite element model. In the model, air spring’s rubber bladder is described with approximation method, and the inside volume is calculated by means of discrete summation. The actual analysis results show that the model is practical.

With the instruction of computational dynamics of multi-body systems theory, the system of rigid bodies and rigidflexible bodies model of the diesel are built using CAE technology. Based on the models, considering the factors of fluid-solid coupling, modal coupling and feedback control technology, the rational boundary condition of diesel's unsteady working condition is analyzed; it contains: cylinder pressure, transient speed, constraint relation and the simulation of the main bearing. The dynamics strength is analyzed using the models on unsteady working condition. The dynamics stress distributing is gotten in different working condition. The modeling and analyzing process can apply to the optimum design of diesel structure, the study of matching of ship-engine-oar and other marine machinery.

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