动态分布载荷识别中的传感器配置研究

发布时间：2018-11-09 16:45

【摘要】：鉴于含噪声的测量响应数据影响了动载荷识别结果的不足,从结构动力学正问题出发,建立动载荷和动响应之间的关系,探索各阶模态的空间分布规律,提出了基于模态函数分布的响应测量点筛选准则,运用级数分解的思想,推导了响应数据含有噪声工况下的载荷识别算法。与常规的平均选取测量点方法比较,改善了反问题求解时的不适定性,大大提高了计算的精度及算法的稳定性。通过数值仿真,当响应数据受噪声污染严重时,验证了方法的有效性和较强的抗噪性能。最后,将提出的响应测量点筛选准则应用于动载荷识别中的多传感器优化配置中,为准确、高效地识别工程结构上的动载荷做技术铺垫。
[Abstract]:In view of the fact that the measurement response data with noise affect the result of dynamic load identification, the relationship between dynamic load and dynamic response is established from the positive problem of structural dynamics, and the spatial distribution law of each order modal is explored. Based on the modal function distribution, the selection criteria of response measurement points are proposed. Using the idea of series decomposition, the load identification algorithm under the condition that the response data contain noise is derived. Compared with the conventional method of average selection of measuring points, the ill-posed method for solving inverse problems is improved, and the accuracy of calculation and the stability of the algorithm are greatly improved. Through numerical simulation, when the response data is seriously polluted by noise, the effectiveness of the method and its strong anti-noise performance are verified. Finally, the proposed response measurement point screening criterion is applied to the multi-sensor optimal configuration in dynamic load identification, which lays the groundwork for accurate and efficient identification of dynamic loads on engineering structures.
【作者单位】：江苏科技大学船舶与海洋工程学院;南京航空航天大学机械结构力学及控制国家重点实验室;合肥工业大学土木与水利学院;
【基金】：国家自然科学基金资助项目(51605202) 江苏省自然科学基金资助项目(BK20160550) 机械结构力学及控制国家重点实验室基金资助项目(0115K01)
【分类号】：TB12

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