双腔室空气弹簧橡胶膜片刚度的研究

Stiffness of pneumatic membrane in a dual-chamber pneumatic isolator

针对双腔室空气弹簧缺少精确的橡胶膜片理论模型的问题,提出一种橡胶膜片刚度模型的理论建模方法。该方法将橡胶膜片依据几何形状特征划分成多个部分,把不规则橡胶膜片的整体建模转化成多个规则形状建模的问题;利用复合材料力学理论得到每个部分的各向异性材料的弹性模量和刚度,最后基于橡胶膜片各部分的刚度关系推导出膜片整体刚度模型。在搭建的试验平台上对所提理论模型进行验证;结果表明,所提建模方法得到的模型与试验结果高度吻合,为双腔室空气弹簧的正向设计提供了理论依据。

Aiming at lack of an accurate theoretical model for pneumatic membrane in a dual-chamber isolator,a theoretical modelling method for stiffness of pneumatic membrane was proposed here.The pneumatic membrane was divided into several parts according to their geometric shapes so that an irregular shape membrane’s whole stiffness modelling problem was converted into stiffness modelling of several parts with regular shapes.The composite material mechanics theory was used to get elastic modulus and stiffness of individual part made of anisotropic material.The pneumatic membrane’s whole stiffness model was deduced based on the stiffness relations among parts of the membrane.This stiffness model was verified with tests on a built test rig.It was shown that the results using the deduced stiffness model agree well with those of tests.This study provided a theoretical basis for the design of dual-chamber pneumatic isolators.