Physical and Applied Acoustics. An Introduction


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Physical and Applied Acoustics: An Introduction (English and German Edition)

Some of the passive and reactive sound absorbers and silencers discussed in Chaps. The compound panel resonators of Sect. Due to their very complicated electro-acoustic and electronic design, they have, however, found only rather limited use in very special instances, for example in headsets for helicopter pilots. In contrast, the aim in what follows is to present a relatively simple principle for actively improving the performance of reactive absorbers. These have meanwhile proven to be successful as highly effective silencer units for low and medium frequencies especially in compact air-conditioning and heating systems.

More recently, various types of absorbers gain importance which react quite differently to the sound field that excites them Chaps. Whether the vibrations occur in panels, foils or membranes Chaps. The present chapter examines absorbers which develop a relatively broadband effectiveness with fundamentally no damping materials. The idea of utilizing the friction in small holes and slots to absorb sound energy is much older than using extremely thin mineral fibers in initially comparatively coarse structures and it originally stems from Russian research by Rschevkin and Terossipjantz , Rschevkin and Veliszhanina However, it was thanks to an old Chinese master acoustician, Maa , that microperforated absorbers MPA were installed for the first time in to solve one of the most spectacular acoustical disasters in Germany during the opening of the German Bundestag in Bonn, see Fuchs and Zha , Meanwhile, in addition to the transparent acrylic glass absorber, a whole family of fiberless acoustical elements made of a variety of different metals, plastics, woods and recently even glass has been developed.

The first three chapters of this compendium on applied acoustics describe the acute need for sound damping measures for machines, plants and buildings, pointing out the special low-frequency problem. The following Chaps. The section on the principles of acoustics and noise control Chaps. Special emphasis is on damping at low frequencies and using fiber-free absorbers with smooth closed surfaces, innovative tools and devices to solve acute acoustical problems. The growing significance of traffic noise as by far the greatest source of noise pollution see Fig. As owners or employees of acoustic engineering firms?

In teaching or research? In the building industry? For noise control authorities? The answer is: in the automobile industry. Take, for example, the Japanese manufacturer Mazda who tested a whole car load of different air intake components when developing the MX-5 roadster in order to give the driver the sound that fits the respective power chosen: softly purring like a kitten or roaring like a lion. These technically and physically challenging developments however call for sophisticated testing facilities to minimize noise emissions and optimize internal noises.

In closed rooms see Chaps. Moreover, if there are suspended particles carried with the fluid, for example dust, there is the risk that deposits on the silencer may diminish its acoustic efficiency a. Verlag Springer Berlin Heidelberg. Print ISBN Electronic ISBN Hansler, Gerhard Sch midt.

E Brekhovskikh, Dr. Oleg A.


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      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction
      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction
      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction
      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction
      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction
      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction
      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction
      Physical and Applied Acoustics. An Introduction Physical and Applied Acoustics. An Introduction

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