| 用三线摆测定物体对非质心轴的转动惯量 |
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| 引用本文： | 李刚常,陈玉坤,余征跃.用三线摆测定物体对非质心轴的转动惯量[J].力学与实践,2007,29(5):54-57. |
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| 作者姓名： | 李刚常 陈玉坤 余征跃 |
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| 作者单位： | 上海交通大学工程力学实验中心 上海交通大学工程力学实验中心 上海交通大学工程力学实验中心 |
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| 摘 要： | 对三线摆的线性近似模型和转动惯量计算公式的由来作了简要说明. 分析了三线摆扭振系统
质心偏移对转动惯量测试的影响，给出了扭振系统质心与三线摆中心轴对齐的判别准则和用
三线摆测定物体对非质心轴转动惯量的工程实用方法. 通过工程实例说明了该方法的有效性
与可靠性. 最后讨论了提高转动惯量实测精度的几项具体措施.
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| 关 键 词： | 三线摆 非质心轴 转动惯量 判别准则 三点称重平衡法 |
| 收稿时间： | 2006-9-18 |
| 修稿时间： | 2006-09-18 |
THE MOMENT OF INERTIA MEASUREMENT OF A BODY ABOUT A NONCENTRAL AXIS OF MASS USING THREE-STRING PENDULUM |
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| LI Gangchang,CHEN Yukun,YU Zhengyue.THE MOMENT OF INERTIA MEASUREMENT OF A BODY ABOUT A NONCENTRAL AXIS OF MASS USING THREE-STRING PENDULUM[J].Mechanics and Engineering,2007,29(5):54-57. |
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| Authors: | LI Gangchang CHEN Yukun YU Zhengyue |
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| Institution: | Engineering Mechanics Experiment Center, Shanghai Jiaotong University, Shanghai 200240, China |
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| Abstract: | The approximate linear model of the three-string pendulum and its computational formula for the moment of inertia are discussed.The influence of the excursion of the mass center of the torsional vibrating system of the three-string pendulum on the measurement of the moment of inertia is analyzed.A criterion for the mass center of the torsional vibrating system to be in alignment with the central axis of the three-string pendulum and a practical method to measure the moment of inertia of a body about a noncentral axis of mass using the three-string pendulum are proposed.It is shown that the present method is effective and reliable. Several concrete measures for improving precision of measuring the moment of inertia are proposed. |
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| Keywords: | three-string pendulum noncentral axis of mass moment of inertia criterion balance method of three-point weighing |
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