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Simulation and test of elastic characteristics of fixed cylinder hydro-pneumatic suspension

As a typical structure of the hydro-pneumatic suspension of medium and heavy tracked vehicles, the fixed cylinder hydro-pneumatic suspension has superior nonlinear characteristics compared with the traditional suspension, which can significantly improve the cushioning performance of the vehicle, so it has been widely concerned by the industry. Most domestic and foreign scholars have studied the mechanical properties of products, but the methods and means are relatively simple, and the transmission ratio of linkage mechanism is mostly simplified linearly, so the calculation accuracy is not high. This paper focuses on the study of the elastic characteristics of fixed cylinder hydro-pneumatic suspension, using ideal gas equation of state theory to describe the internal change law, derived the calculation and analytical formula of the elastic characteristics, and combined with multi-body dynamics software Recurdyn to establish a parametric MBD (Multi body dynamics) model of fixed cylinder hydro-pneumatic suspension. The geometric nonlinear description of the transmission ratio of the linkage mechanism can be realized, and the elastic characteristic curves of the hydro-pneumatic suspension under different parameters can be obtained. The accuracy of the model is verified by bench test, which can effectively guide the design of the product. It lays a foundation for exploring the influence law of different parameters on hydro-pneumatic suspension characteristics and multi-parameter tuning and optimization of vehicle performance.