大学物理 ›› 2022, Vol. 41 ›› Issue (5): 9-.doi: 10.16854/j.cnki.1000-0712.210337

• 教学讨论 • 上一篇    下一篇

琴弦在点驱动力作用下受迫振动的研究

王一鸣,宋睿 ,刘济尘,孙笛家   

  1. 1.中国刑事警察学院 公安信息技术与情报学院,辽宁 沈阳110854;2. 中国刑事警察学院 侦查与反恐怖学院,辽宁 沈阳110854
  • 收稿日期:2021-07-19 修回日期:2021-11-01 出版日期:2022-05-20 发布日期:2022-05-10
  • 作者简介:王一鸣(1989—),男,山东聊城人,中国刑事警察学院公安信息技术与情报学院讲师,博士,主要从事物理声学和司法语音检验研究和教学工作
  • 基金资助:
    中央高校基本科研业务费博士启动项目(D2019015);2020年度辽宁省自然科学基金国家重点实验室项目(2020-KF-12-11)资助

Research on forced vibration of strings under point driving force

WANG Yi-ming, SONG Rui, LIU Ji-chen, SUN Di-jia   

  1. 1 . School of police information technology, Criminal Investigation Police University of China, Shenyang, Liaoning 100854, China; 2. School of investigation, Criminal Investigation Police University of China, Shenyang, Liaoning 100854, China
  • Received:2021-07-19 Revised:2021-11-01 Online:2022-05-20 Published:2022-05-10

摘要: 利用Dirac δ函数构建了无阻尼琴弦在周期性点驱动力作用下的受迫振动方程,给定边界条件并对其进行求解.导出了该模型解的具体形式,并分析了外加驱动力的频率对体系振幅的影响.发现了共振、反共振以及伪共振现象,确定了3种现象发生的条件.并设计实验对共振与伪共振现象的发生条件进行验证,实验结果与理论预期相符合.

关键词: 点驱动力, 受迫振动, 共振, 反共振, 伪共振

Abstract: In this paper,the equation of forced vibration of the undamping strings driven by a periodic driving force was established by means of Dirac δ function. The equation is solved with boundary conditions. The solution is shown and the influence of frequency on amplitude was analyzed. Resonance, antiresonance and pseudoresonance were found, and the conditions of the three phenomenons are determined. At last, the experiments on verifying the conditions of resonance and pseudoresonance are designed, the experiment results are consistent with theoretical predictions.

Key words: point driving force, forced vibration, resonance, anti-resonance, pseudo-resonance