Computer Simulation of Structure Ezperimental Mode Based on Virtual Instrument
Identification of modal parameters using orthogonal polynomials possesses high precision. In the paper, a new approach is proposed in using virtual instrument for identification of the natural characteristics which are the mode frequency, mode damping and mode shapes of a mechanical structure. A multiple—input modal identification method in the frequency domain is discussed The frequency response function(FRF)is expressed as a rational fraction formulation with matrix coefficients．The Forsythe orthogonal polynomial is exploited to reduce the ill-conditioning of the equations and to decouple the system matrix．Taking use of the eigenvalue decomposition and singular value decomposition the poles and residues of the system are solved. It combines the developed virtual instrument software “LabVIEWwith the software Visual C++ for modal analysis, and makes program using LabVIEW for controlling the data acquisition card to generate a file with a fixed data format and applies this file to complete the experiment of analysis making program using Visual C++. The experimental results for different structures have certified the availability of the approach．
Structure Ezperimental Mode Orthogonal Polynomial Virtual Instrument
HAO lihua WANG yongtian
Dept. of Optical Engineering Beijing Institute of Technology Beijing，100081，China Dept. of Informati Dept. of Optical Engineering Beijing Institute of Technology Beijing，100081，China
国际会议
北京
英文
1523-1535
2009-08-08（万方平台首次上网日期，不代表论文的发表时间）