Instrument for measuring moment of inertia with high precision

Yongjun Zheng; Min Lin; Bin Guo

doi:10.1117/12.885551

28 December 2010 Instrument for measuring moment of inertia with high precision

Yongjun Zheng, Min Lin, Bin Guo

Proceedings Volume 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation; 75441G (2010) https://doi.org/10.1117/12.885551
Event: Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 2010, Hangzhou, China

Abstract

Accurate calculation of the moment of inertia of an irregular body is made difficult by the large number of quantities. A popular method is to use a trifilar suspension system to measure the period of oscillation of the body in the horizontal plane. In this paper, an instrument for measuring the moment of inertia based on trifilar pendulum is designed; some sources of error are discussed; three metal disks with known moments of inertia are used to calibrate the instrument, the other metal disks with known moments of inertia are used to test the accuracy of the instrument. The results are consistent when compared with calculated moment of inertia of the metal disks. In addition, the instrument could be used to measure the moment of inertia of other irregular objects. The period of oscillation is acquired by the capture mode of MSP430 microprocessor, the mass is obtained by the Electronic Balance and the data is transferred to the MSP430 via serial port.

Citation Download Citation

Yongjun Zheng, Min Lin, and Bin Guo "Instrument for measuring moment of inertia with high precision", Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 75441G (28 December 2010); https://doi.org/10.1117/12.885551

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