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Component Mode Synthesis Using Undeformed Interface Coupling Modes to Connect Soft and Stiff Substructures

机译：使用未变形的界面耦合模式连接软和刚性子结构的组件模式综合

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摘要

Classical component mode synthesis methods for reduction are usually limited by the size and compatibility of the coupling interfaces. A component mode synthesis approach with constrained coupling interfaces is presented for vibro-acoustic modelling. The coupling interfaces are constrained to six displacement degrees of freedom. These degrees of freedom represent rigid interface translations and rotations respectively, retaining an undeformed interface shape. This formulation is proposed for structures with coupling between softer and stiffer substructures in which the displacement is chiefly governed by the stiffer substructure. Such may be the case for the rubber-bushing/linking arm assembly in a vehicle suspension system. The presented approach has the potential to significantly reduce the modelling size of such structures, compared with classical component mode synthesis which would be limited by the modelling size of the interfaces. The approach also eliminates problems of nonconforming meshes in the interfaces since only translation directions, rotation axes and the rotation point need to be common for the coupled substructures. Simulation results show that the approach can be used for modelling of systems that resemble a vehicle suspension. It is shown for a test case that adequate engineering accuracy can be achieved when the stiffness properties of the connecting parts are within the expected range of rubber connected to steel.
机译：用于还原的经典分量模式合成方法通常受耦合接口的大小和兼容性限制。提出了具有约束耦合界面的组件模式合成方法，用于振动声学建模。耦合接口被限制为六个位移自由度。这些自由度分别表示刚性界面平移和旋转，保留了未变形的界面形状。对于具有在较软和较硬的子结构之间耦合的结构，提出了该公式，其中位移主要由较硬的子结构控制。车辆悬架系统中的橡胶衬套/连接臂组件就是这种情况。与经典的组件模式合成相比，所提出的方法具有显着减小此类结构的建模尺寸的潜力，而经典的组件模式合成将受到界面的建模尺寸的限制。该方法还消除了界面中网格不协调的问题，因为对于耦合的子结构只需要平移方向，旋转轴和旋转点是公共的即可。仿真结果表明，该方法可用于对类似于车辆悬架的系统进行建模。对于一个测试案例表明，当连接部件的刚度特性在与钢连接的橡胶的预期范围内时，可以实现足够的工程精度。

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