介绍一种测定不规则棒形构件径向惯性矩的测定方法

The General Bifilar Torsion Pendulum of Measuring Radial Moment of Inertia for Irregular Stick Shaped Bodies

本文介绍了一种一般（不对称）双线摆的结构原理。根据能量法阐述了这种摆微幅与 巨幅振荡周期的近似解法。同时还说明了该摆的某些特点与优点。用这种方法能够可靠而准 确地测量不规则棒形构件的径向惯性矩，并可以不用任何夹具，当摆角０＜ ４０°时，其测量精 确度优于１％。

This paper described the structure and principle of a bifilar torsion pendulum in its general (unsymmetrical) form. The approximate expressions of the oseillating period for small and large angle oscillations of the general bifilar torsion pendulum are derved according to the theory by energy. Some important oscillating properties and advantages are presented. The moment of small-sized irregular stick shaped objects around a radial axis can be measared reliably without any specia fixture. When 0＜ 40°, the vncertainty of measarement is better than 1%.