音叉振动阻尼系数的测定与研究  

A study on damping coefficient of tuning fork

作　　者：尤亦庄[1] 王晓翰[1] 王喆[1] 龚国斌[2] 潘永华[2] 

机构地区：[1]南京大学基础学科教学强化部,江苏南京210089 [2]南京大学物理系,江苏南京210093

出　　处：《大学物理》2007年第5期58-61,共4页College Physics

摘　　要：利用计算机的声卡采集音叉振动信号,研究了振动衰减过程中阻尼系数的大小,得出了阻尼系数不是常数,而是与音叉振幅成线性关系的初步结论,并用共振态下策动力振幅对音叉振幅的关系验证了这一结论.根据阻尼系数与振幅的关系解释了两种传统方法测量结果差别很大的原因.With the high accuracy of computer-based collecting device, the damping coefficient is measured and the theory that the damping coefficient fl remains constant in damped vibration is revised. A linear relation of β and the velocity amplitude A is presented based on the data obtained. A further experiment is performed in which the linear relation of β and A is confirmed by the measuring of instigative force and velocity amplitude under the state of resonance. Considering the relation of β and A, the differences of the results obtained by the two traditional ways are explained.

关 键 词：阻尼系数 音叉 非线性振动 声卡采集 

分 类 号：O4-33[理学—物理]