仿真, 多体系统, 自然坐标法, 自然坐标系

A self-adaptation method for natural-coordinate systems was proposed, in order to select natural coordinates automatically for each rigid elements of a multibody system.A four-step method includes:first, find out all empty positions, which come from the feature points or vectors of the joints attached to an element, and give equal weight to them; second, delete redundant empty positions and add their weight to the unique one; third, select at most four empty positions which have a maximum total weight and can be occupied by a natural-coordinate system at the same time; fourth, the standard natural-coordinate system on the element can adapt itself to the selected empty positions,leading to an actual natural-coordinate system, which contains twelve rational natural coordinates for the element. The implementation of the method was achieved on a multibody dynamics and motion analysis platform, InteDyna, resulting in modelling efficiency enhanced and model quality improved.