【摘要】 介绍了求截面对任一对轴的惯性矩和惯性积的图解法，并用此方法确定了主惯性矩和主惯性轴的位置。该方法是惯性矩和惯性积转轴公式的一种补充，但用图解法求惯性矩和惯性积更直观、简单．更多还原

【Abstract】 Introducing the diagram method of moment of inertia and product ofinertia, also by using this method,the position of principal momcnt of inertia and principal moment of axis. It is an complement to the fomula oftranferaxis of moment of inertia and product of inertia. but more direct and simpler.更多还原