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1.
扭摆法是测量物体转动惯量的有效方法,其不确定度分析是关键.本文推导了扭摆法测物体转动惯量准确的不确定度传递公式,得到各直接测量量及其不确定度对转动惯量不确定度的影响.并进行了算例分析.结果表明,扭摆法比三线摆测得物体的转动惯量的误差以及不确定度要小很多.这对实验方法的选择和仪器的研制具有重要的实际意义.  相似文献   

2.
转动惯量是物体定轴转动中的重要物理量,物体的转动惯量测量的常用方法有三线摆法与扭摆法。扭摆法通常测量物体通过质心转轴的转动惯量,所以用扭摆法验证平行轴定理一直不怎么直观,本文就是在已有的基础上进行一些改进,已达到更好、更直观验证平行轴定理。  相似文献   

3.
在利用扭摆法测定物体的转动惯量实验中,充分考虑仪器及测量等方面的误差,尤其在考虑摆动角度的影响下,定量的对扭摆的摆动周期、弹簧的扭转常数以及载物盘的转动惯量等参数进行了标定。  相似文献   

4.
针对传统扭摆法测物体转动惯量系统误差较大的缺点,在扭摆的改进和实验数据的处理方面提出了行之有效的方法,从而达到减小系统误差的目的.  相似文献   

5.
通过声卡并运用Audition软件可以对扭摆次数和时间进行自动记录和保存,计算出扭摆周期,从而测定刚体转动惯量.从图形上读出时间数据具有直观、快捷、准确的特点,减少了由于人为因素造成的误差.  相似文献   

6.
对扭摆法测量刚体转动惯量的实验装置进行改进,在扭摆上加装一个圆柱形外罩,屏蔽了空气压差阻尼,保持空气黏性阻尼在测量过程恒定,提高了测量精度.  相似文献   

7.
在当前大学物理实验扭摆法测量物体转动惯量实验中,通常将"几何法"与"扭摆法"相互交织,导致实验过程逻辑混乱.本文提出删除用"几何法"倒推"扭摆法"中弹簧扭转常数K值这一环节,改用"定义法"直接测量K值,从而将"几何法"与"扭摆法"隔离,并重新设计了实验内容,使实验条理更加清晰.  相似文献   

8.
邱菊  刘宇星  孔炎 《大学物理》2006,25(9):37-38,58
提出利用扭摆验证转动惯量平行轴定理的两种简单易行的新方法,并通过实验证明了该方法的可行性.  相似文献   

9.
研制了一种蜗簧扭摆,这种扭摆在测量物体的转动惯量时,具有性能稳定、精度高、操作简便等特点。  相似文献   

10.
转动惯量是描述刚体转动惯性量度的重要物理量, 它具有重要的物理意义. 本文利用一种双悬扭摆的 实验装置来对物体的转动惯量进行实验研究以及对平行轴定理进行实验验证  相似文献   

11.
Summary The internal friction (loss tangent) of solids is normally measured, as a function of temperature, with a torsion pendulum operating in free decay. Curves of the internal friction and the oscillation frequency, against temperature, are obtained at various moments of inertia, to extract the parameters characteristic of the relaxation process (relaxation time and strength). In all these experiments only the temperature is considered as an independent variable and the moment of inertia of the pendulum is mainly used to shift the internal friction peaks in the temperature scale. It is pointed out in the paper that the moment of inertia is also an independent variable which can be used to determine, with high accuracy, if the measured peak is of the Debye type or not. A new torsion pendulum, with continuously variable moment of inertia is presented, which allows measurements of the partial derivative of the internal friction and the oscillation frequency with respect to the moment of inertia, at constant temperature. Finally, some measurements of the Snoek relaxation in Nb-O alloys are presented, to show the applicability of the concepts developed in the paper. The authors of this paper have agreed to not receive the proofs for correction.  相似文献   

12.
本文简要地介绍了我校工科物理实验引进德国实验设备,用扭摆测定物体转动惯量的仪器装置和方法  相似文献   

13.
本文研究分析扭摆法测量转动惯量实验的系统误差来源,在此基础上对实验方法、装置提出改进,改进后实验结果与理论值的百分差可降低一至二个数量级.  相似文献   

14.
15.
The standard evaluation of the partition function Z of Schwarz's topological field theory results in the Ray–Singer analytic torsion. Here we present an alternative evaluation which results in Z=1. Mathematically, this amounts to a novel perspective on analytic torsion: it can be formally written as a ratio of volumes of spaces of differential forms which is formally equal to 1 by Hodge duality. An analogous result for Reidemeister combinatorial torsion is also obtained.  相似文献   

16.
The consistency of the substitution method has been checked by examining the change of the planar moment of inertia upon substitution in those cases where this change should be zero by symmetry. From 438 literature data it was concluded that Costain's estimate for the reliability of substitution coordinates is adequate except for the HD substitution where it is too optimistic by at least a factor of 2. A special case is formed by the substitution CH3CH2D, where absurdly large differences in the planar moments of inertia occur. It is shown that these differences can be largely eliminated when the effects of the torsion on parent and substituted molecules are properly accounted for. Approximate formulas for this purpose are derived and tested. It appears that neglect of these corrections is not justified when the geometry of a methyl group is to be determined accurately.  相似文献   

17.
中子星的转动惯量与表面红移的研究   总被引:1,自引:0,他引:1  
李文飞  张丰收  陈列文 《中国物理 C》2001,25(10):1006-1011
在温度、密度及同位旋相关的核物质状态方程的基础上,通过求解Tolman–Oppenheimer–Volkoff方程,得到了中子星的转动惯量与表面红移.计算结果表明,中子星的转动惯量较强地依赖于核物质的不可压缩系数与对称能强度系数,而对核子有效质量不太敏感;中子星的表面红移却对对称能强度系数不太敏感,而较强地依赖于不可压缩系数与核子有效质量.  相似文献   

18.
The influences of σ* and Φ mesons,temperature and coupling constants of nucleons on the moment of inertia of the proto neutron star(PNS) are examined in the framework of relativistic mean field theory for the baryon octet {n,p,Λ,Σ+,Σ0,Σ+,Ξ-,Ξ0} system.It is found that,compared with that without considering σ* and Φ mesons,the moment of inertia decreases.It is also found that the higher the temperature,the larger the incompressibility and symmetry energy coeficient,and the larger the moment of inertia of a PNS.The influence of temperature and coupling constants of the nucleons on the moment of inertia of a PNS is larger than that of the σ* and Φ mesons.  相似文献   

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