机械振动模态分析的附加质量法

本文研究的附加质量法是识别振动系统模态参数的一种近似方法。这种方法具有简便易行节省费用的优点,而且只需要一般的测振仪器即可进行。该法主要利用结构物在附加微小质量后所引起的各阶固有频率的变化来推算有关的模态参数。本文叙述了附加质量法的实施方法,理论依据及其计算公式,并用模型实验数据验证了它的有效性。

Method of Additional Mass in Modal Analysis of Mechanical Vibration

The method of additional mass suggested in this paper is an upproximate method of identifying the modal parameters of a vibration system.This me thod has its advantages in sinplicity,convenience and low cost,and some standard instruments and meters are required only.using the variations of na- tural frequencies caused by adding a small mass to a structure,the relative modal parameters can be evaluated with method.In this paper theoretical basis,implemental procedure and fomulation of this method are discussed, and its validity has been tested with the aid of the experimental data of the modal.