转子系统模态阻尼测定的相位匹配法  

Research of Measuring Rotating Mechanical Modal Damping by Phase Matching Method

作　　者：郑龙席[1] 刘钢旗[1] 梅庆 李晓丰[1] 刘继华[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]航空发动机振动技术航空科技重点实验室,株洲412002

出　　处：《振动．测试与诊断》2014年第2期218-222,392-393,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：航空科学基金资助项目(20112153019)

摘　　要：模态阻尼是转子系统达到每一阶模态振型时所表现出来的一种系统阻尼,是研究转子系统动力学特性的一个重要参数。在分析模态阻尼传统测量法——半功率法缺点的基础上,提出了一种新的模态阻尼测量方法——相位匹配法。相位匹配法的原理是:建立目标函数,利用数值计算,对试验获得的相位随转速变化的数据进行最小距离估计,从而确定出转子振动系统的阻尼系数。在转子试验器上进行了试验研究,测得了系统的模态阻尼系数,其大小与半功率法测量结果接近。理论分析和试验结果表明,相对于半功率法,相位匹配法具有安全性高、稳定性强的优点。Modal damping is a kind of system damping in which the rotating machinery reaches every order modal shape.It is an important parameter in the dynamic response of rotating machinery.Due to the draw-backs of the traditional half power method,this paper proposes a new modal damping measurement method—the phase matching method.The phase matching method is to obtain the minimum distance estimation for the test phase data varied with the speed in order to determine the damping coefficient.This method is measured on rotating test equipment,and the obtained modal damping coefficient is close to the value obtained from the half power method.Theory analysis and test results show that when compared to the half power method,the phase matching method has the advantages of high safety and good stability.

关 键 词：转子 模态阻尼 半功率法 相位匹配法 

分 类 号：TB535.1[理学—物理] TH113[理学—声学]