Dynamic model for large multi-flexible-body space structures

Abstract

Large multi-fiexible-body space structures, such as space solar arrays, comprise of multiple fiexible substructures that are connected by joint hinges. Unlike traditional continuous structural models, a noncontinuous multi-ñexible-body structural model with joint hinges is set up for the multi-flexible-body structure herein. In contrast to the general multi-body structural models in which each substructure is taken as a rigid body, the elastic deformation of every substructure in the multi-fiexible-body structural model is taken into account. Furthermore, the connection stifiFness and friction damping of joint hinges are considered as they affect the structural dynamic properties. All of the aforementioned considerations make the dynamic modeling of this multifiexible-body structural system rather difficult. To solve the problem, an innovative semi-analytical model is developed for each fiexible substructure. A four-node massless spring-damper element is built up for each joint hinge, in which the stiffness and damping coefficients of the hinge are calibrated by experiments. By comparing the computed results with experimental results, it can be concluded that the method proposed herein is correct and efficient.

Vibration control for the solar panels of spacecraft: Innovation methods and potential approaches

“…The parameters in matrices K e and C e and the results of equivalent frequencies determined via the frequency equivalent method presented above in the article are displayed in Tables 1-3, respectively. 34…”

“…Reproduced with permission. 34 Copyright 2014, World Scientific Publishing Company. (A) Modal experiment for an actual solar array structure, (B) two-plate sample test system, and (C) three-plate sample test system.…”

“…The local control laws of the subsystems are suggested as (34) where P F v , , i ij i are the feedback gain matrix, subsystem coupled matrix, and extra input vector, respectively.…”

“…I G U R E 9 A diagram of the semianalytical modeling method. Reproduced with permission 34. Copyright 2014, World Scientific Publishing Company.…”

“…To describe the connection dynamic properties as comprehensively as possible, a kind of joint element model has been presented in this section. In the model, the joint has been simplified as a four-node massless spring damper element, which has included all its 3D stiffness properties and damping parameters, as shown in Figure17.Then the dynamic model equation can be obtained via FEM 34.…”