从单自由度系统衰减响应分离与辨识粘性与干摩擦混合阻尼的方法  

A Method for Separating and Identifying Mixed Coulomb and Viscous Damping from Decrement Response of a Single Degree-of-freedom System

作　　者：傅俊庆[1] 李汉雄[2] 

机构地区：[1]长沙理工大学汽车与机械学院,长沙410076 [2]中南大学机电工程学院,长沙410083

出　　处：《机械科学与技术》2006年第3期305-307,共3页Mechanical Science and Technology for Aerospace Engineering

基　　金：湖南省自然科学基金项目(03JJY6018)资助

摘　　要：针对正压力随位移成正比的干摩擦与粘性混合阻尼单自由度振子,从其位移自由振动响应导出了分离和辨识粘性阻尼比与干摩擦阻尼因子的理论公式,并通过数值仿真例子对公式进行了验证。结果表明,在无测量噪声条件下,本文所提出的公式是理论上的精确表达式。其数值仿真例子的参数估计结果精度非常高,完全能够满足科学研究与工程实际的需要。For a vibrator of a single degree-of-freedom system with mixed viscous and coulomb damping induced by normal pressure proportional to displacement from its free displacement decrement, the paper derived a formula for separating and identifying two classes of damping, which were verified by numerical simulation instances. The simulation results indicate that the derived formulas are theoretically precise when there is no measured noise. The parametric estimation results of the numerical simulation instances are highy accurate and satisfy the needs of research and engineering.

关 键 词：单自由度最统 非线性振动 粘性与干摩擦混合阻尼 参数辩识 阻尼分离 

分 类 号：O322[理学—一般力学与力学基础] TH117.1[理学—力学]