利用洛伦兹力激发谐波，在单根弦上演奏旋律

IF 0.8 4区教育学 Q3 EDUCATION, SCIENTIFIC DISCIPLINES

American Journal of Physics Pub Date : 2024-03-01 DOI:10.1119/5.0152828

Yukai Wei, Hao Zhu, Haotian Jiang, Quanxin Luo, Shan Lin, Junqing Li, Yu Zhang, Bibo Zhao

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引用次数: 0

摘要

我们展示了一根固定长度的金属吉他弦如何产生音阶。将琴弦放在永久磁铁附近，在所需音符的频率下对琴弦施加交流电，洛伦兹力就会在琴弦上产生该频率的振动。设置琴弦的张力，使其谐波与所需的音符相对应。通过使用这些谐波频率，可以近似实现一个八度的音阶，从而使用我们的非接触式单弦演奏出多种旋律。该项目可用于演示或实验室项目。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Playing melodies on a single string by exciting harmonics using the Lorentz force

We show how a single metal guitar string of fixed length can produce a musical scale. The string is placed near a permanent magnet, and by applying an AC to the string at the frequency of the desired musical note, the Lorentz force creates vibrations in the string at that frequency. The tension of the string is set so that its harmonics correspond to the desired notes. A one-octave scale can be approximated by using these harmonic frequencies, allowing several melodies to be played using our non-contact monochord. This project could be adopted for demonstration or laboratory projects.

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来源期刊

American Journal of Physics 物理-物理：综合

CiteScore

1.80

自引率

11.10%

发文量

146

审稿时长

3 months

期刊介绍： The mission of the American Journal of Physics (AJP) is to publish articles on the educational and cultural aspects of physics that are useful, interesting, and accessible to a diverse audience of physics students, educators, and researchers. Our audience generally reads outside their specialties to broaden their understanding of physics and to expand and enhance their pedagogical toolkits at the undergraduate and graduate levels.