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首页> 外文期刊>Mechanical systems and signal processing >Substructure decoupling without using rotational DoFs: Fact or fiction?
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Substructure decoupling without using rotational DoFs: Fact or fiction?

机译：不使用旋转自由度的子结构解耦：事实还是虚构？

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In the framework of experimental dynamic substructuring, substructure decoupling consists in the identification of the dynamic behaviour of a structural subsystem, starting from the dynamic behaviour of both the assembled system and the residual subsystem (the known portion of the assembled system). On the contrary, substructure coupling identifies an assembled system starting from the component subsystems. The degrees of freedom (DoFs) of the assembled system can be partitioned into internal DoFs (not belonging to the couplings) and coupling DoFs. In substructure coupling, whenever coupling DoFs include rotational DoFs, the related rotational FRFs must be obtained experimentally. Does this requirement holds for substructure decoupling too, as it is commonly believed? Decoupling can be ideally accomplished by adding the negative of the residual subsystem to the assembled system (direct decoupling) and by enforcing compatibility and equilibrium at enough interface DoFs. Ideally, every DoF of the residual subsystem belongs to the interface between the assembled system and the residual subsystem. Hopefully, not all the coupling DoFs are necessary to enforce compatibility and equilibrium. This may allow us to skip coupling DoFs and specifically rotational DoFs. The goal of the paper is indeed to establish if rotational FRFs at coupling DoFs can be neglected in substructure decoupling. To this aim, after highlighting the possibility of avoiding the use of coupling DoFs from a theoretical standpoint, a test bed coupled through flexural and torsional DoFs is considered. Experimental results are presented and discussed.
机译：在实验动态子结构的框架中，子结构去耦包括识别结构子系统的动态行为，该过程从组装系统和残余子系统（组装系统的已知部分）的动力学行为开始。相反，子结构耦合标识了从组件子系统开始的组装系统。组装系统的自由度（DoF）可以分为内部DoF（不属于联轴器）和联轴器DoF。在子结构耦合中，只要耦合自由度包括旋转自由度，就必须通过实验获得相关的旋转FRF。正如人们普遍认为的那样，该要求是否也适用于子结构去耦？通过将残余子系统的负数添加到组装系统中（直接去耦）并在足够的接口DoF处强制实现兼容性和平衡，可以理想地实现去耦。理想地，残差子系统的每个自由度都属于组装系统和残差子系统之间的接口。希望并非所有耦合的DoF都是强制执行兼容性和平衡所必需的。这可以使我们跳过耦合自由度，特别是旋转自由度。本文的目标确实是确定在子结构解耦中是否可以忽略耦合自由度上的旋转FRF。为了这个目的，在从理论的角度强调了避免使用耦合自由度的可能性之后，考虑了通过挠曲和扭转自由度耦合的测试台。实验结果进行了介绍和讨论。

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