基于非正交分解串扰消除的全频段传递路径分析方法研究

项目名称： 基于非正交分解串扰消除的全频段传递路径分析方法研究

项目编号： No.11472289

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 伍先俊

作者单位： 中国科学院声学研究所

项目金额： 95万元

中文摘要： 传递路径分析是复杂结构振源识别的有效手段，目前传递路径分析法OTPA等存在缺陷，OTPA采用正交主分量分析技术，而各激励源的响应是非正交的，正交分解无法解决串扰问题；采用具有相位关系的传递函数的传递路径分析不适用于对结构细节敏感的中高频段问题。课题提出基于非正交分解实现串扰消除的全频段传递路径分析法：（1）建立一种基于非正交分解的串扰消除法：先分步激励获得非正交向量，然后通过非正交分解获得各源的独立贡献量，研究非正交向量的简便获取方法，以及非正交向量分解方法及误差控制理论。（2）针对传统传递分析方法不适用于中高频段的缺点，结合统计能量分析法和OTPA，建立中高频段传递路径分析法，以及分析中高频非正交分解串扰消除法。得到完善的全频段传递路径分析法，用以解决水下结构、高铁舱室等复杂结构噪声源防串扰识别分析的技术瓶颈问题。

中文关键词： 传递路径分析；结构振动；串扰

英文摘要： Transfer path analysis is an effective method to identify vibration source in complex structure. There are defects in operational transfer path analysis (OTPA) etc., OTPA adopts the principal component analysis technique to solve the crosstalk problem, but each source's vibration response is non-orthogonal, the orthogonal decomposition method can't solve the crosstalk problem. Additional problem is that the transfer function method which contains the phase parameters is not suitable for high frequency transfer path analysis, in that frequency range the transfer function is very sensitive to structural details. The crosstalk cancellation method in the full-spectrum range based on the non-orthogonal decomposition is proposed. Researches will be done to: (1) Establish the basic theory of the non-orthogonal decomposition method. Its steps are that acquiring the non-orthogonal vector firstly, and then using the non-orthogonal decomposition method to get the contribution from each source. Researches will be done on the acquisition method of non-orthogonal vector,the decomposition algorithm and the error control method. (2) Establish a new method to solve the middle and high frequency transfer path problem based on OTPA and SEA because in that frequency range the traditional method is not suitable. Researches will also be done to establish a non-orthogonal decomposition method for solving the crosstalk problem in the middle and high frequency range. At last the vibration transfer path analysis method in the full spectrum range will be put forward, which will be used to solve the bottle neck problem in vibtaion source diagnosing of the complex structures like the underwater structure and high speed rail carriage.

英文关键词： transfer path analysis;structure vibration;crosstalk