Optimal reference sensor positions using output-only vibration test data
Optimal reference sensor positions using output-only vibration test data
复制标题
DOI：
10.1016/j.ymssp.2013.06.039
复制
发表时间：
2013-12-01
影响因子：
8.4
通讯作者：
Bucher, Christian
中科院分区：
文献类型：
--
作者：
Brehm, Maik;Zabel, Volkmar;Bucher, Christian
在有限元模型修正的背景下，实验获得的特征被用来改善初始有限元模型的质量。利用振动测试，可以从测量数据中提取固有频率、振型和模态阻尼比等特征。执行这种测试的一种可能性是需要定义参考传感器的位置以合并所有设置的信息的巡回设置配置。因此，参考传感器位置的确定对于可靠的结果是非常重要的。目前的研究集中在弱平稳过程中假设随机激励下的最优参考传感器位置的确定。预测的功率谱幅值和初始有限元模型是确定传感器可能位置的验证标准的基础。结合定义传感器位置的几何设计变量，应用遗传算法避免了对所有可能的参考传感器位置组合的评估，并通过简支梁的数值基准研究和实际试件的案例研究验证了该方法的适用性。此外，还将确定期望功率谱幅值的理论与振动试验结果进行了比较。结果表明，只要初始有限元模型具有足够的精度，该方法就适用于确定最优参考传感器位置。(C)2013爱思唯尔有限公司。保留所有权利。
In the context of finite element model updating, experimentally obtained features are used to improve the quality of an initial finite element model. Using vibration tests, features like natural frequency, mode shapes, and modal damping ratios can be extracted from measured data. One possibility to perform such tests is a roving setup configuration that requires defining the positions of reference sensors to merge the information of all setups. Therefore, the determination of reference sensor positions is very important for reliable results.The presented research is concentrated on the determination of optimal reference sensor positions assuming random excitations within a weakly stationary process. Predicted power spectral amplitudes and an initial finite element model are the basis to define the validation criterion of possible sensor positions. In combination with geometrically based design variables, which define the sensor positions, a genetic algorithm is applied to avoid the assessment of all possible combinations of reference sensor positions.The applicability of the proposed approach is demonstrated on a numerical benchmark study of a simply supported beam and a case study of a real test specimen. Furthermore, the theory of determining the expected power spectral amplitudes is compared with results of vibration tests. It can be concluded that the proposed approach is suitable to determine optimal reference sensor positions as long as the initial finite element model has a sufficient accuracy. (C) 2013 Elsevier Ltd. All rights reserved.