基础激励下结构模态参数辨识

利用基础激励辨识结构模态参数的方法是一种在空间飞行器的研制中具有工程意义的模态分析方法。文中对这一方法做了较为系统的探讨，推导出了基础激励下频响函数的数学模型，其形式类似于传统方法中相应的公式，因而只需对测量数据稍作代数修改，即可利用现成的模态分析系统进行基础激励下模态参数的辨识。通过计算机仿真、悬臂梁试验及工程实例的综合分析，表明基础激励方法在工程应用中具有与其他传统方法同等的可靠程度。

IDENTIFICATION OF STRUCTURAL MODAL PARAMETERS UNDER DRIVEN-BASE EXCITATION

dentification of structural modal parameters using driven-base excitation is a modal analysis method of practical significance in development of space vehicles.A systematic exploration is presented in this paper.The theoretic Frequency Response Function under driven-base excitation, which is similar to those of tradinon methods, is derived.So the existing modal analysis system can be used to identify modal parameters under driven-base after a little algebraic modification of measured data.It is indicated that the method of driven-base has the same reliability as other traditional methods through computer simulation, cantilever tests and practical application.