基于信号能量分析的结构阻尼比识别方法  

DAMPING RATIO IDENTIFICATION METHOD BASED ON SIGNAL ENERGY ANALYSIS

作　　者：曾储惠[1] 黄方林[1] 柳成荫[1] 陈政清[1] 

机构地区：[1]中南大学土木建筑学院,长沙410075

出　　处：《振动与冲击》2003年第2期66-68,42,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目 (编号 50 1 780 1 3)

摘　　要：本文提出一种基于信号能量分析计算结构阻尼比的新方法。推导出自由振动响应信号能量与阻尼比关系的理论表达式后 ,求出阻尼比。与传统的对数衰减率法相比 ,此法精度、抗噪声干扰能力强、稳定性好。振动系统信号的能量之所以会衰减 ,是因为阻尼的存在。本文提出的这种识别阻尼比的方法物理概念清晰 ,易于理解。仿真计算和洞庭桥实测试验结果表明所提出的方法有效、可行。Method of damping ratio identification based on signal energy analysis is proposed in the paper.After concluding a theoretical relation between signal energy and damping ratio,the damping ratio can be determined.As compared with the traditional logarithmical-decrement method,the method is of higher precision,stronger anti-noise ability and better stability.Signal energy of a vibration system will be reduced because of the existence of damping ratio.For this reason,the method has the advantage of clear physical concept and easy comprehensibility.The results of digital simulation and practical tests show that the method proposed in the paper is effective and reliable.

关 键 词：能量分析 阻尼比 参数识别 信号分析 自由振动响应信号 自由度振动系统 

分 类 号：O325[理学—一般力学与力学基础] TN911.6[理学—力学]