结构振动数据数学模型的线性与非线性刻划

对振动测试数据评价参数的数学反演使用时间序列的线性和非线性模型进行了建模，计算结果表明非线性的ＳＥＴＡＲ模型描述测试数据所反映的物理过程比线性ＡＲＭＡＸ模型更趋于合理、全面和客观。非线性ＳＥＴＡＲ模型能较深刻描述被测体系的振动机理和物理行为，为下一步振动数据评判奠定了基础

COMPARED LINEAR MODEL AND NONLINEAR ON THE DESCRIPTION OF STRUCTURE VIBRATION DATA

The linear and nonlinear model on the structure vibration data with the time sequence method is presented in this paper. The calculated result shows that nonlinear model of SETAR is more promotive than linear model of ARMAX in identificating and extracting of parameter of damage of structure based on the spectrum analysis. It predicts that nonlinear model of SETAR are more reosonable and objective than linear model of ARMAX in describing the physical proceeding inside the test data set, and it can describe the mechanism of vibrating and behavior of system response deeply.This theory give a strong base for the evaluating data after the modeling.