波尔共振实验“异常现象”的研究  

Studies on two unexpected phenomena from the Pohl resonance experiment

作　　者：董霖[1] 王涵[1] 朱洪波[1] 

机构地区：[1]北京邮电大学理学院,北京100876

出　　处：《大学物理》2010年第2期57-60,共4页College Physics

摘　　要：对波尔共振实验中的两个"异常现象"进行了研究.研究发现,轴承摩擦和弹簧非线性效应是造成阻尼振动实验中出现"异常现象"的主要因素;电机转速的不稳定性能够导致受迫振动实验中"异常现象"的出现.通过添加两个非线性项和一个频率修正项,经数值计算表明,实验中的"异常现象"能得到很好的分析和解释.Two unexpected phenomena got from the experiment ＇ torsion pendulum of free and forced rotational oscillations using the Poht resonance equipment are analyzed. Mechanicl damping and nonlinear effects of coil spring are found to be mainly responsible for the unexpected phenomenon. Furthermore, unstable driving fre- quency under some conditions can be the possible explanation for the second unexpected phenomenon. The linear dynamical equations are modified to become a nonlinear equation whose numerical solution explains the unexpected phenomena successfully.

关 键 词：波尔共振仪 非线性物理 数值计算 

分 类 号：O322[理学—一般力学与力学基础]