42.1 Introduction

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Sound-absorption equipment is used for multiple purposes in architectural acoustics, mechanical noise

countermeasures, and so on. In this context, the necessity for designing sound-absorption equipment

from the viewpoint of noise control is explained. Architectural acoustics is an important area of study,

which involves architecture, sound-absorption design, and sound-measurement facility.

In the area of noise reduction, the characteristics of sound are important, and proper sound-absorbing

material should be selected based on how much attenuation is necessary for each frequency of sound.

In particular, acoustic characteristics of sound-absorbing material such as the type of material and the

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© 2005 by Taylor & Francis Group, LLC

sound-absorption mechanism are important. In this chapter, the basics of sound absorption

are given, and the prediction and calculation methods for attenuation of lined or dissipative mufflers

are outlined.

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