力矩方程与投影方程相互替代的探讨

Approach to Theory of Replacement Between Moment Equations and Projection Equations

对静力学中为什么可以用力矩方程代替投影方程求解平衡问题而不能相反这一问题,就空间任意力系的情形进行了论证和探讨。从理论上指出这一规律的普遍性、正确性及其内涵。

The paper makes an approach to why we can replace projection equations by moment equations in solving equilibrium problem but don't contrary , For the case of general forces. system in space, writer proved correctness and universality of this law. At the same time, points out substance of this law.