柔性充气囊体结构的动力学响应和姿态分析

Dynamic Response and Attitude Analysis for Flexible Inflatable Capsule Structures

对主体结构为柔性充气囊体的某飞行器动力学响应和飞行姿态特性进行了研究。针对球锥外形的柔性充气囊体结构,建立参数化模型,基于ANSYS软件进行柔性充气囊体静力和动力学响应分析。在静力分析中用惯性释放法模拟完全无约束的结构,得到控制力作用下的变形、应力和质量参数变化。在动力学响应分析中用完全法分析了充气囊体结构在控制力作用下的瞬态动力响应,得到由大幅刚体位移和小幅弹性振动组成的结构位移响应。建立了充气囊体的姿态运动方程,基于MATLAB自编程序,研究了控制力作用下充气囊体的姿态动力学特性,分别分析了不考虑弹性变形和考虑弹性变形两种情况的柔性充气囊体姿态特性。结果表明:在控制力作用下充气囊体的弹性变形不大,绕初始平衡状态发生大幅的刚体位移;控制力产生的弹性变形对充气囊体的姿态动力学特性影响较大,姿态分析中需考虑弹性变形引起的质量参数变化。

The dynamic response and flight attitude characteristics of some aerospace aircraft with the main body of flexible inflatable capsule structure were studied in this paper. The shape of flexible inflatable capsule structures was a conical shell and the parameterized model had been set up. Based on ANSYS software, static and dynamic response of the structures were analyzed. Using the inertial release method in the static analysis, the unconstrained structures were simulated. The deformation, stress and the change of quality parameters were obtained while subjected to the control forces. Using the complete method, the transient dynamic responses of flexible inflatable capsule structure were analyzed. The structural responses composed of rigid body displacement and elastic vibration were obtained. The motion equations of the flexible inflatable capsule ？s attitude were established. Based on a MATLAB self- compiled program, attitude characteristics of the capsule structures were studied. The attitude characteristics considering elastic deformation or not were analyzed respectively. Results showed that elastic deformation of flexible inflatable capsule structure under the control forces was not large,and the transient dynamic responses were mainly composed of the rigid body displacement around the initial equilibrium state. The elastic deformation caused by control forces had great influence to the attitude characteristics of the aircraft. The changes of quality parameters with the elastic deformations needed to be considered during the attitude analysis of this type of aircrafts.