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Realization of Resonance of a Diaphragm at Any Desired Frequency

Published online by Cambridge University Press:  23 November 2015

Y. Zhang  and
L. Huang
Y. Zhang*
Affiliation:
Lab of Aerodynamics and AcousticsZhejiang Institute of Research and InnovationThe University of Hong KongHong Kong, China Department of Mechanical EngineeringThe University of Hong KongHong Kong, China
L. Huang
Affiliation:
Shenzhen Institute of Research and InnovationThe University of Hong KongHong Kong, China
*
*Corresponding author (yumin@connect.hku.hk)
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Abstract

In noise control, the reactance of a mechanical system needs to be minimized while the resistance is chosen suitably. This work illustrates the possibility of and the ease at which such design tasks may be accomplished by utilizing strong electromechanical coupling. Moving-coil loudspeaker is chosen as the vehicle of illustration and it is considered as a simple spring-mass system when operated below its first diaphragm mode. It is shown that the system mechanical property may be tuned easily by a simple R-LC circuit. In addition to the assigned resonance frequency, there can be a maximum of two other resonances. It is argued that the ability to tune the system mechanical resonance to any frequency, such as the ones at very low frequencies, can be very useful for noise and vibration control applications.

Keywords

Tunable reactanceElectromechanical couplingNoise control
Type
Research Article
Information
Journal of Mechanics , Volume 34 , Issue 1 , February 2018 , pp. 29 - 34
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2018 

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