Download E-books Engineering Acoustics: An Introduction to Noise Control PDF

By Michael Möser

 

Suitable for either person and crew studying, Engineering Acoustics makes a speciality of simple recommendations and techniques to make our environments quieter, either in constructions and within the outside.

The author’s educational variety derives from the conviction that realizing is greater whilst the need at the back of the actual instructing method is made transparent. He additionally combines mathematical derivations and formulation with vast factors and examples to deepen comprehension.

Fundamental chapters at the physics and conception of sound precede these on noise aid (elastic isolation) equipment. The final bankruptcy offers with microphones and loudspeakers.

Moeser contains significant discoveries by means of Lothar Cremer, together with the optimal impedance for mufflers and the twist of fate impression at the back of structural acoustic transmission.

The appendix offers a brief advent at the use of complicated amplitudes in acoustics.

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1. 1 Octave and third-octave band filters . . . . . . . . . . . . . . . . . . . . . . . 1. 2 listening to degrees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. three A-Weighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. four Noise fluctuating over the years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. five precis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. 6 extra interpreting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. 7 perform routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7 nine 10 12 thirteen thirteen 14 2 basics of wave propagation . . . . . . . . . . . . . . . . . . . . . . . . . 2. 1 Thermodynamics of sound fields in gases . . . . . . . . . . . . . . . . . . . 2. 2 One-dimensional sound fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 2. 1 uncomplicated equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 2. 2 innovative waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 2. three complicated notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 2. four status waves and resonance phenomena . . . . . . . . . . . . 2. three 3-dimensional sound fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. four power and gear shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. five depth measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. five. 1 Time area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. five. 2 Frequency area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. five. three dimension mistakes and obstacles . . . . . . . . . . . . . . . . . . 2. five. four criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 6 Wave propagation in a relocating medium . . . . . . . . . . . . . . . . . . . . 2. 7 Raised waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. eight precis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. nine additional analyzing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 10 perform workouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 18 24 24 29 34 34 38 forty forty four forty five forty five forty nine fifty three fifty three fifty nine sixty two sixty three sixty three X Contents three Propagation and radiation of sound . . . . . . . . . . . . . . . . . . . . . . . . sixty seven three. 1 Omnidirectional sound radiation of aspect resources . . . . . . . . . . . . sixty seven three. 2 Omnidirectional sound radiation of line resources . . . . . . . . . . . . . . sixty eight three. three quantity speed assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 three. four Sound box of 2 resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . seventy two three. five Loudspeaker arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eighty five three. five. 1 One-dimensional piston . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 three. five. 2 Formation of major and facet lobes . . . . . . . . . . . . . . . . . . . . ninety one three. five. three digital beam guidance . . . . . . . . . . . . . . . . . . . . . . . . . . . ninety six three. five. four Far-field stipulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a hundred three. 6 Sound radiation from aircraft surfaces . . . . . . . . . . . . . . . . . . . . . . . 103 three. 6. 1 Sound box at the axis of a round piston . . . . . . . . . . . . 106 three. 7 precis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . one hundred ten three. eight extra studying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 three. nine perform routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 four Structure-borne sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 four. 1 advent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 four. 2 Bending waves in beams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a hundred and twenty four. three Propagation of bending waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 four. four Beam resonances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 four. four. 1 Supported beams .

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