火箭仪器舱试验与计算模态相关性分析

针对火箭仪器舱，研究了计算模态和试验模态的相关性分析问题。首先介绍模态相关性分析的一般方法。针对仪器舱结构复杂和模态密集的特点，引入整体模态和局部模态的概念，并提出一种用模态应变能比值区分整体模态和局部模态的定量的方法。进而研究了模态向量减缩、误差定位和模型修改等问题。在此基础上，得到了较高的试验和计算模态相关性结果，验证了计算模型，并为进一步的仪器舱减振设计提供了依据。

CORRELATION EVALUATION OF TESTED AND CALCULATED MODES OF A ROCKET EQUIPMENT CABIN

The technique for correlation evaluation of the tested and calculated modes of a rocket equipment cabin is studied. First, the general methods of modal correlation evaluation are presented. In order to solve the difficulty in analyzing a large and complex structure with dense modes like a rocket equipment cabin, the concepts of integral modes and partial modes are introduced. A criterion, which can distinguish these two kinds of modes conveniently with ratio of the modal strain energy, is then given. The modal vector reduction, error localization and model updating methods are approached. The final correlation is satisfactory, and the finite element model of the equipment cabin certified in this paper can be used in the design of vibration control systems.