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Hybrid Modeling of Floating Raft System by FRF-Based Substructuring Method with Elastic Coupling

机译：基于FRF基下结构法的浮动筏系统的混合建模与弹性耦合

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摘要

The FRF-based substructuring method with elastic coupling by using hybrid experimental and numerical FRFs and impedance is investigated for predicting vibration transmission in floating raft system. The floating raft system composed of one machine, upper and lower isolators, raft and base under symmetric and unsymmetrical excitation conditions is studied experimentally to show the influence of rotational Degrees of Freedom (DOFs). The results demonstrate that if the system is exposed to unsymmetrical excitation, the isolators will undergo bending deformation and it should consider the vibration transmission by rotational DOFs. For hybrid modeling, since measurement of FRFs is limited to some translational DOFs, FRFs of other DOFs are calculated by numerical methods. Three possible ways are proposed to improve the modeling accuracy. The identification method for mobility of isolators in rotational DOFs under static load is suggested. Filters constructed by piecewise linear interpolation method is used to condition the numerical FRFs with the measured FRFs. The truncated Singular Value Decomposition (SVD) approach is used to improve the quality of measured FRFs in the presence of measurement errors. Careful application of the proposed measures may result in better prediction.
机译：研究了利用混合实验和数值FRF和阻抗的具有弹性耦合的基于FRF的子结构方法，以预测浮动筏系统中的振动传递。通过实验研究了由一台机器，上部和下部隔离器，筏，筏和基础组成的浮动筏系统，以显示旋转自由度（DOF）的影响。结果表明，如果系统暴露于非对称激励，则隔离器将经历弯曲变形，并且应考虑旋转DOF的振动传输。对于混合建模，由于FRF的测量仅限于一些平移DOF，因此通过数值方法计算其他DOF的FRF。提出了三种可能的方式来提高建模精度。提出了静态载荷下旋转DOF中隔离器的迁移率的识别方法。通过分段线性插值方法构造的滤波器用于将数值FRF与测量的FRF进行调节。截短的奇异值分解（SVD）方法用于提高测量误差存在下测量FRF的质量。仔细应用提出的措施可能会导致更好的预测。

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