<正>用试验模态分析方法测取的系统前1阶模态参数,由于噪声等多种因素的影响,具有一定误差。因而导致α与β取值产生误差。作为理论探讨,本文提出加权最小二乘法求取α与β。旨在用有限元法计算结构动力响应时,使α与β的初值选取更趋合理。

There must be errors for the measuring values of the first 1 order data of a system due to the noise and other factors in the Testing Model Analysis. The errors must affect the calculating accuracy of a and 3. To improve accuracy, as a theoretical discussion, this paper presents a new calculating method-the Weight Least Square Method. This method could get more accurate initial value of a and 3 when dynamical respond of construction is calculated by the Method of Finite Element.