【摘要】 介绍了对称式三线摆与不对称式双线摆的工作原理及其微角和大角摆动周期的近似解法 ,同时说明了这两种摆的特点。利用这两种摆测量不规则转子或构件绕轴向和绕径向的惯性矩 ,既方便又准确。若采用长摆线 ,当摆角 φ0 <4 0°时 ,测量准确度优于 1%。更多还原

【Abstract】 This paper described the functional principle and approximate expressions of the oscillating periods in small and large angle oscillation for the symmetrical trilinear torsion pendulum and the general (namely unsymmetrical) bifilar torsion pendulum. Some important oscillating properties and advantages for them were presented in the meantime. The moment of inertia about axial or radial for the unsymmetrical rotors in axial can be measured reliably and exactly by using the two pendulums without any special fixtures. When using the long lenths of pendulum arms and φ 0<40°, the accuracies of measurement with such means can be better than 1%.更多还原