大学物理 ›› 2017, Vol. 36 ›› Issue (5): 11-18.doi: 10.16854/j.cnki.1000-0712.2017.05.004

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品质因数的多重内涵及其教学探讨

李翔   

  1. 桂林电子科技大学电子工程与自动化学院,广西桂林541004
  • 收稿日期:2016-06-06 修回日期:2016-11-07 出版日期:2017-05-20 发布日期:2017-05-20
  • 作者简介:李翔( 1984—) 男,广西玉林人,桂林电子科技大学电子工程与自动化学院讲师,博士,主要研究方向为
  • 基金资助:
    广西高等教育创优计划项目( 优质本科专业) 资助

Discussions on multiple connotations of quality factor and its teaching

LI Xiang   

  1. School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin,Guangxi 541004,China
  • Received:2016-06-06 Revised:2016-11-07 Online:2017-05-20 Published:2017-05-20

摘要: 从正弦激励下线性二阶系统的微分方程出发,结合阻尼振子的受迫振动以及RLC 串联、并联谐振电路等具体物理情境,剖析了品质因数Q 在频率特性、能量转换以及系统各物理参数等多个层次上的内涵,进而探讨如何更好地为工科各专业学生讲授品质因数这一概念.

关键词: 品质因数, 受迫振动, 谐振电路.

Abstract: Multiple connotations of the quality factor Q associated with frequency characteristic,energy conversion,and various physical variables are analyzed. The analysis is based on the differential equation of second-order system with sinusoidal excitation,as well as the physical contexts of forced damping vibration and RLC serial /parallel resonant circuits. Then it is also discussed that how to teach the concept of quality factor Q better for engineering students.

Key words: quality factor, damping vibration, resonant circuit