【摘要】 通过自动调节多刚体系统中每个构件上自然坐标系的形态,达到自动选择自然坐标的目的。提出了自然坐标系的自适应调节方法:首先,为标准自然坐标系找出周边所有基点空位和矢量空位并对其加权;然后,剔除冗余空位并调整权值;接着,找出最多4个权值总和最高的可行空位;最后,标准自然坐标系调节自身形态以占据所有可行空位。调节结果是实际的自然坐标系,它为该构件提供12个合理的自然坐标。在多体动力学仿真平台InteDyna上实现了该方法,提高了自然坐标法的建模效率和建模质量。更多还原

【Abstract】 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.更多还原