自适应变刚度支承结构力学性能研究

摘要

Instability of supporting load in the propulsion system with thin-shell stator is discussed. A support structure with adaptive variable stiffness is designed to adapt the large deviation of engine diameter and output a stable support load within the large compression deformation. The finite element model(FEM) with different geometric parameters of the simplified cell structure is established, involving the nonlinear constitutive model of rubber. Effect on the mechanical characteristics of the different geometric parameter is concluded from the finite element simulation and optimization method is obtained as a result.%针对推进系统薄壁壳体静子支承结构设计中支承载荷不稳定的问题,设计了一种具有自适应变刚度力学性能的支承结构,提取该结构主要特征参数建立单元体模型,并结合橡胶材料非线性本构模型进行有限元仿真,结果表明该结构能够在较大压缩量范围内保持载荷稳定.此外通过仿真对比分析获得了主要设计参数对其力学性能的影响规律,表明其变刚度拐点、平台载荷等均可以通过结构和材料参数进行优化.