Dynamic Analyses Of A New Kind Of Interconnected Double-Chamber Hydro-Pneumatic Strut

The dynamics analysis and research of multi-point coordinated damping systems is a key and difficult area in engineering application fields,and is of great significance as it will involve the application of multi-point coordinated damping in practical applications such as vehicle suspensions,bridges and weapon platforms.Due to its special configuration,the hydro-pneumatic damper can simply interconnect two or more sets of dampers to form a multi-point coordinated damping system by means of interconnecti on pipes compared to mechanical interconnection structure,which is conducive to balancing the contradictory relationship between ride comfort and handling stability to achieve better anti-roll and anti-pitch performance when applied to vehicle suspensions.Therefore,this paper focuses on the basic study of the dynamic characteristics of a new kind of interconnected hydro-pneumatic damper which base on the integrated the double-chamber hydro-pneumatic strut.This new kind of double-chamber hydro-pneumatic strut uses two float systems to separate the piston rod part and the annular oil chamber part to produce a double-chamber structure.Compared with the conventional interconnected hydro-pneumatic damper system,this structure is able to balance the rigid characteristics of the output force and improve the unfavorable characteristics of the output force distortion during the operation of the system.The details of the study are as follows.(1)In order to accurately study the dynamic characteristics of the doublechamber hydro-pneumatic strut,the sample structure design(with emphasis on the sealing tightness problem)was first carried out and the corresponding experimental platform was built,while a set of monolithic structures were modified by adding annular oil chamber damping orifices for the monolithic sample experiments.Based on the working principle of hydro-pneumatic damper combined with gas multi-party process,volume conservation law and flow relationship of damping orifice,established the mathematic model of modified structure and carried out experimental tests.(2)Based on the analysis of experimental data,the frictional characteristics are stripped,the hyperbolic tangent hysteresis function is selected to describe the frictional charac teristics,and the relevant parameters of the hyperbolic tangent hysteresis function are optimized by using genetic algorithm in combination with experimental data.Finally,the accuracy of the established frictional model is verified by combining experime ntal data,and a set of mathematical models is established to describe the dynamics of the double-chamber hydro-pneumatic damper more accurately.(3)A new kind of interconnected hydro-pneumatic damper which base on the integrated the double-chamber hydro-pneumatic strut is proposed.The corresponding simulation model is established by AMEsim software,and the simulation model is verified according to the experimental results of the existing experimental conditions.Secondly,the simulation models are used to compare the dynamics of three different configurations of integrated hydropneumatic dampers under different operating conditions to verify the effectiveness of the proposed integrated double-chamber hydro-pneumatic dampers.Finally,the different pre-charge pressure of this new kind of interconnected hydro-pneumatic damper is analyzed and compared for the next practical application.