This ebook examines the actual heritage of engineering acoustics, concentrating on empirically received engineering adventure in addition to on size suggestions and engineering tools for prognostics. Its aim isn't just to explain the nation of artwork of engineering acoustics but additionally to provide functional support to engineers as a way to remedy acoustic difficulties. It bargains with the foundation, the transmission and the equipment of the abating other kinds of air-borne and structure-borne sounds brought on by quite a few mechanisms – from site visitors to equipment and flow-induced sound. moreover the trendy features of room and construction acoustics, in addition to psychoacoustics and lively noise regulate, are covered.
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Additional resources for Handbook of Engineering Acoustics
2 Acoustic Measurements 25 For 1/2-in. microphones, this simple approach is valid up to approximately 2 kHz. Above this limit, diffraction at the microphone distorts the sound pressure. The total displacement of the diaphragm is then given by the integral over the surface elements excited by the incident sound wave with locally varying sound pressures in amplitude and phase. Accordingly, the sensitivity is dependent on the direction and describable by a directivity function. This behaviour of microphones must be considered at higher frequencies, and the type of sound field must then be specified.
By using a simple equivalent circuit, the sensitivity of a condenser microphone can be estimated in a first approximation. The significant components on the electrical side are resistance and capacity and, on the mechanical side, the compliance of both the diaphragm connected to the housing and of the air cavity. One important task of microphone design is the optimisation of (a) the compliance and (b) the damping of the mechanical resonance caused by holes in the backplate. The resulting frequency response covers a range from 2 Hz to 22 kHz (1/2-in.
Junger M, Feit D (1986) Sound, structures and their interaction, 2nd edn. MIT, Cambridge 2 Acoustic Measurements M. 1 Introduction Acoustic measurements are the obvious prerequisite of acoustic investigations, in research as well as in applied acoustics. They are an important tool for the analysis of acoustical problems or for creation of experimental references in theoretical and numerical approaches. The accuracy required can only be reached if certain requirements concerning the instrumentation are met and if the acoustical conditions and the measurement methods are clearly specified.