An improvement on the moment inertia measurement of the rigid body
The orginal measurement method of moment inertia of a rigid body is done by measur-ing the average angle acceleration between the angluar dispacement of 2π～6π of the system before and after the detachment of the mass from the tower wheel,respectively.Hence,the mehod requires that both the movements before and after the detachment of the mass are of uniform-acceleration motion.H owever,this prerequisite is usually cannot be sitisfied well and a systematic error will be intro-duced,correspondently.Here,the instrument was modified using a paper tape with black white stripes,optical fiber amplifier and data acquisition card.The data processing method was optimized and the prerequisite of the uniform acceleration was attenuated.Reference measurements suggested that the upgrade significantly reduced measurement error,improved the verification on the parallel ax-is law.
moment of inertiaoptical fiber amplifierrigid body dynamics
NETL
NSTL
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