• Title: Control of noise and structural vibration : a MATLAB-based approach / Qibo Mao, Stanislaw Pietrzko.
  
• Author: Qibo. Mao
• Publisher: London : Springer
• Date: 2013
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The presence of structure-borne sound is a persistent problem in acoustics. Various noise control techniques, such as passive, active, or a combination of the two control techniques (hybrid), have been developed in different fields to reduce the noise. Among those techniques, the traditional passive noise reduction techniques are widely used in industries and commercial products. Passive control methods typically use absorptive materials or vibration absorbers to achieve noise reduction. They are proved to be very effective in the middle and high frequency ranges. However, in the low frequency range, passive noise control often makes noise elimination equipment very bulky and inefficient. For example, absorptive materials are not a practical means of attenuation at low frequencies because of the thickness requirement to absorb the large acoustic wavelengths. Similarly, damping materials typically are not effective in attenuating low-frequency vibrations and radiating sound. Thick and massive viscous materials are required, which again presents a practicality problem with implementing this traditional control technique to realistic applications. Efficient vibration and noise reduction approach in the low frequency range thus poses a challenging topic to noise control engineers.