Deployable Flexible Truss Dynamic Analysis Based On Absolute Nodal Coordinate Method

The deployable structure is widely used in the fields of aerospace, machinery, architecture, etc.With the higher project requirements, the weight of the structure is getting more and more light,and the previous handling of the structure, which is limited to the rigid model, cannot meet thedemands of modern projects any more. Especially in the present aerospace field, they need thestructure to be easily transported, conveniently carried, and can spread stably under normalworking conditions, so the flexible multibody analysis is an important element which must beconsidered during the structure design.This article first describes the absolute nodal coordinate method and combines with finiteelement, then draws a geometric description of the truss unit and establishs the principle ofdynamic equations of Hamilton on the basis of the absolute nodal coordinate method, on this basis,this article conducts numerical simulations with various truss structures in the Matlab. First, Iadopt the absolute nodal coordinate method about a lever and verify feasibility of this method;then, I conduct the simulation of the cross-truss element, this simulations are used "tangentcoordinate method" and the "two-node coordinate method" to represent the deformation of thetruss,comparing the results of two simulation, and prove that the "tangent coordinate method" ismore appropriate to describe the deformation of the truss; third, with the simulation of acrank-rod mechanism, this study compares of the "rigid" link and "flexible" link campaign; finally,conducting the four-link truss structure dynamics simulation, the consequence reflects theimportance of flexible body analysis: although the four-bar linkage is symmetrical in the initialstate, but,with the continuous role of the load, state of motion is no longer symmetricalvariation(but the overall trend is consistent).The study has shown that truss analysis using multi-rigid-body analysis has been unable to meetthe actual demand. The absolute nodal coordinate method in this articles using can be effectivelydeveloping flexible truss kinetic analysis, and the result is more accurate, more in line with theactual situation.