模态试验中柔性支承特性的识别及其对试验结果影响的修正  

Identification of Support Properties and Correction of their Effects for Modal Tests

作　　者：曾庆华[1] 

机构地区：[1]南京航空航天大学振动工程研究所

出　　处：《振动．测试与诊断》1995年第3期15-22,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：航空基金

摘　　要：对模态试验中采用的柔性支承的特性（刚度和阻尼）识别和支承对模态参数影响修正方法作了研究。在常规的试验中，识别出刚体模态和所需的弹性模态，通过刚体运动拟合、系统矩阵识别和结构修改等途径，可识别出支承特性，并同时得到去除支承影响后的模态试验结果。通过一直梁的计算机仿真及试验，对方法作了检验。A technique to identify stiffness and damping of flexible supports,and to correctthe effects of the supports on modal parameters is developed for modal tests.Through theordinary modal test,rigid body modes and required flexible modes are prelimlnarily estimated.By fliting the rigid body motion,calculatingsystem matrlces and structural dynamicsmodification,the stiffness and damping are identified.At the same time,the effects of thesupports on.the modal parameters are eliminated,and corrected modal parameters are obtamed.Simulation and experiment show the feasibility of the presented techniqe.

关 键 词：模态试验 参数识别 支承系统 结构动力学 

分 类 号：O329[理学—一般力学与力学基础]