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首页> 外文期刊>Aerospace science and technology >Removing mass loading effects of multi-transducers using Sherman-Morrison-Woodbury formula in modal test
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Removing mass loading effects of multi-transducers using Sherman-Morrison-Woodbury formula in modal test

机译：在模态测试中使用Sherman-Morrison-Woodbury公式消除多传感器的质量负载效应

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摘要

In the modal test of lightweight structures, the measured data is easily polluted by mass loading effects of transducers. A method is proposed to eliminate the influence of sensors for accurately estimating the frequency response functions (FRFs) of structures. Considering the situation that the multiple accelerometers lead to changes in the dynamic stiffness matrix, the corrected FRFs are derived from the original measured signals based on the Sherman-Morrison-Woodbury formula. The salient feature of the proposed strategy is that the adverse effects of sensors can be eliminated in only one step. Numerical simulations are conducted by employing a six-degrees of freedom spring-mass system, modal frequencies and mode shapes with high accuracy are obtained by measured signals. Experimental investigation is undertaken by using a laboratory solar panel. Results show that the effects of multi-transducers mass can be removed efficiently and the corrected FRFs are in good agreement with the targeted values. The excitation and measurement points are regarded as active coordinates, and the computational efficiency can be significantly improved when the presented method is applied on active coordinates. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：在轻型结构的模态测试中，传感器的质量负载效应很容易污染测量数据。提出了一种消除传感器影响的方法，以准确估计结构的频率响应函数（FRF）。考虑到多个加速度计导致动态刚度矩阵发生变化的情况，基于Sherman-Morrison-Woodbury公式从原始测量信号中得出校正后的FRF。所提出策略的显着特征是，仅一步就可以消除传感器的不利影响。通过采用六自由度弹簧-质量系统进行数值模拟，通过测量信号可以获得高精度的模态频率和模态形状。通过使用实验室太阳能电池板进行实验研究。结果表明，可以有效消除多传感器质量的影响，校正后的FRF与目标值非常吻合。将激励点和测量点视为主动坐标，将本方法应用于主动坐标可以大大提高计算效率。 （C）2019 Elsevier Masson SAS。版权所有。

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