利用突变弦线探究波速与线密度之间的函数关系  

INVESTIGATION OF FUNCTION BETWEEN THE WAVE VELOCITY AND LINEAR DENSITY BASED ON A SEGMENTED STRING

作　　者：郑庆跳 陈少华[2,3] 王芳[2,3] ZHENG Qingtiao;CHEN Shaohua;WANG Fang(College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing),Beijing 102249;Science College,China University of Petroleum(Beijing),Beijing 102249;Beijing Key Laboratory of Optical Detection Technology for Oil and Gas,China University of Petroleum(Beijing),Beijing 102249)

机构地区：[1]中国石油大学(北京)机械与储运工程学院 [2]中国石油大学(北京)理学院 [3]中国石油大学(北京)油气光学探测技术北京市重点实验室,北京102249

出　　处：《物理与工程》2020年第6期117-120,共4页Physics and Engineering

基　　金：中国石油大学(北京)校级教改项目;中国石油大学(北京)“研究生教育质量与创新工程”项目。

摘　　要：针对均质弦线中波速随线密度变化不易直观观察的问题,本文设计了基于突变弦线的驻波装置。实验发现,在线密度较大的弦线中,波速较小。同时,本文测量了两部分弦线的线密度之比和波速之比,拟合得到了波速随着线密度变化的函数关系。相比均质弦线,突变弦线的驻波装置具有较小的系统误差,同时具有使用方便、现象直观和数据丰富的特点。It was difficult to observe directly how the wave velocity in the homogeneous string changed with its linear density.In the paper,a standing wave device based on the segmented string was developed to solve the above problem.It was found that the wave velocity is smaller in the string segment with higher linear density.Moreover,the function of wave velocity about the linear density was obtained by measuring the ratio of linear density and wave velocity of the two segments of the string.Compared to the standing wave device based on the homogeneous wire,the device based on the segmented wire had many advantages,involving the smaller system error,easy control,intuitive phenomenon,and abundant data.

关 键 词：密度突变 弦线 波速 波长 

分 类 号：G642[文化科学—高等教育学] O4-4[文化科学—教育学]