扭秤系统的品质因数和振幅的关系研究

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英文篇名：Study on Relationship Between the Quality Factor and Amplitude of the Torsion Balance System 作者：刘琳霞 英文作者：LIU Lin-xia(Department of Electronics and Communication Engineering,Henan Mechanical and Electrical Engineering College,Xinxiang 453003,China) 关键词：扭秤 ; 品质因数 ; 阻尼振动 ; 振幅 英文关键词：torsion balance;quality factor;damping vibration;amplitude 中文刊名：PYDX 英文刊名：Journal of Xinxiang University(Natural Science Edition) 机构：河南机电高等专科学校电子通信工程系; 出版日期：2013-04-15 出版单位：新乡学院学报(自然科学版) 年：2013 期：v.30;No.126 语种：中文; 页：PYDX201302005 页数：2 CN：02 ISSN：41-1399/N 分类号：13-14

摘要

在周期法测万有引力常数的实验中,扭秤系统的品质因数Q会影响实验精度.采用速度阻尼模型,讨论了扭秤振幅对系统品质因数的影响.结果表明,在不考虑振幅非线性的情况下,振幅对品质因数并没有直接的影响,实验中Q值的变化可能是由振幅的非线性效应引起的.
        In the experiment of Newtonian gravitational constant with the time-of-swing method,the pendulum’s quality factor Q will affect the experiment accuracy.In the letter,the influence of pendulum’s amplitude on the quality factor is discussed using the speed damping model,and the calculation results show that the amplitude has no direct impact on the quality factor without considering the amplitude nonlinear.The change in value of the quality factor Q may be caused by the nonlinear effect of the amplitude in the experiment.

引文

[1]BAGLEY C H,LUTHER G G.Preliminary Results of a Determination of the Newtonian Constant of Gravitation:A Testof the Kuroda Hypothesis[J].Physical Review Letters,1997,78(16):3047-3050.
    [2]KUROD K.Does the Time-of-Swing Method Give a Correct Value of the Newtonian Gravitational Constant?[J].PhysicalReview Letters,1995,75(15):2796-2798.
    [3]NEWMAN R D,BANTEL M K.On Determining G Using a Cryogenic Torsion Pendulum[J].Measurement Science andTechnology,1999,10:445-453.
    [4]杨山清.扭丝滞弹性效应的精确测量[D].武汉:华中科技大学,2009.
    [5]胡忠坤.万有引力常数G的精确测量与扭秤特性研究[D].武汉:华中科技大学,2001.
    [6]漆安慎,杜婵英.力学[M].北京:高等教育出版社,1999:298.