湖南大学学报（自然科学版）2024，Vol.51Issue(7)：62-71,10.DOI:10.16339/j.cnki.hdxbzkb.2024068
模态测试不确定性影响因素分析及传感器布置应用
Analysis of Influencing Factors on Uncertainty in Modal Testing and its Application on Sensor Layout Scheme
摘要
Abstract
The accuracy of modal test results is affected by uncertain influencing factors such as data acquisition,data processing,and parameter estimation.To study the uncertainty levels of modal parameters and their behaviors under different influencing factors in modal testing,a fast uncertainty quantification analysis method based on the state space model and Fisher information matrix(FIM)is adopted.The influence of multiple factors including data duration,sampling frequency,signal-to-noise ratio,and damping ratio of vibration signal on the uncertainty levels of modal parameters is discussed,and a practical way for optimizing the sensor layout scheme through uncertainty analysis is proposed.Results show that the uncertainty level of modal parameters decreases with the increase of data duration,sampling frequency,signal-to-noise ratio,and the number of sensors,and increases with the increase of damping ratio;for uniformly distributed structures,the majority of the sensors at the upper and middle region of the structure and only a few at the lower region is a preferred sensor layout scheme with small overall uncertainty of modal parameters.关键词
模态测试/不确定性分析/费希尔信息矩阵/状态空间方法Key words
modal testing/uncertainty analysis/Fisher information matrix/state-space methods分类
建筑与水利引用本文复制引用
王志宇,陈华钊,施袁锋,张惊朝,戴靠山..模态测试不确定性影响因素分析及传感器布置应用[J].湖南大学学报（自然科学版）,2024,51(7):62-71,10.基金项目
国家自然科学基金资助项目(52278512),National Natural Science Foundation of China(52278512) （52278512）
科技部重点研发计划资助项目(2022YFE0113600),MOST Key Research and Development Plan(2022YFE0113600) （2022YFE0113600）
四川省自然科学基金资助项目(2022NSFC0432),Sichuan Provincial Natural Science Foundation(2022NSFC0432) （2022NSFC0432）
