大学物理设计实验: 李萨如图形演示装置研究

物理实验

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吴晗( 1991—) ，女，河南商丘人，上海科技大学物质科学与技术学院工程师，博士，主要从事大学物理实验教学研究工作

收稿日期: 2021-03-24

修回日期: 2021-03-24

网络出版日期: 2021-10-15

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Design experiment of university physics: research on demonstration device of Lissajous graphic

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1. School of Physical Science and Technology，Shanghai Tech University，Shanghai 201120，China; 2. School of Physics Science and Engineering，Tongji University，Shanghai 200092，China

Received date: 2021-03-24

Revised date: 2021-03-24

Online published: 2021-10-15

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本文介绍了一种大学物理综合设计性实验，自制李萨如图形演示装置. 首先理论上分析了由薄膜受迫振动形成李萨如图形的原因.

实验结果表明，李萨如图形的形状和大小会随着驱动声源频率的增加做周期性的变化; 最后根据测得的共振频率值计算出乳胶气球表面积扩大一倍时的等效表面张力值约为 46.00 N /m，表明该装置具有一定的实际应用性

关键词： 设计性实验; 受迫振动; 李萨如图形; 共振频率; 表面张力

吴晗, 于瑶, 游胤涛, 唐永军, 张锦龙 . 大学物理设计实验: 李萨如图形演示装置研究[J]. 大学物理, 2021 , 40(10) : 36 . DOI: 10.16854 / j.cnki.1000-0712.210147

In this paper，a comprehensive design experiment of university physics，the self-making

Lissajous graphic demonstration device is introduced. The reason why Lissajous figures is formed

through theoretically analy- zing the thin film ' s forced vibration. The experimental

results show that the shape and size of Lissajous figures change periodically when the

frequency of the sound source increases. Finally，the effective surface tension value is estimated

to be about 46.00 N / m through the measured resonance frequency when the surface area of latex

ballon is twice the normal area，indicating that the device has certain practical applicability.

Key words： design experiment; forced vibration; Lissajous graphics; resonance frequency; surface tension

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