By Paul Filippi, Aime Bergassoli, Dominique Habault, Jean Pierre Lefebvre
The publication is dedicated to the very foundation of acoustics and vibro-acoustics. The physics of the phenomena, the analytical tools and the trendy numerical concepts are offered in a concise shape. Many examples illustrate the elemental difficulties and predictions (analytic or numerical) and are usually in comparison to experiments. a few emphasis is wear the mathematical instruments required by means of rigorous idea and trustworthy prediction methods.
- A series of sensible difficulties, which mirror the content material of every chapter
- Reference to the key treatises and primary contemporary papers
- Current computing thoughts, utilized in challenge solving
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Additional info for Acoustics: basic physics, theory and methods
R i I 5O 40 \ 30 I I I -]I I I I I I \ 20 10 I I 10 I -q- -%___ 7- 30 I I I I I J X1 40 I I 50 ~(~) 10 20 50 100 rq _L 20 ! 200 500 1000 2000 I I 5000 (H~) Fig. 1. Delany and Bazley's model of impedance: real and imaginary parts of ~ as a function of frequency (s = 300). 47 CHAPTER 2. 12) with a = 1,/3 = 0 ~ Neumann boundary condition a = 0,/3 = 1 --* Dirichlet boundary condition a = 1,/3 # 0 ~ Robin boundary condition When the boundary is composed of several panels with different homogeneous materials, the coefficients a and /3 are piecewise constant functions.
Oo 62 ACOUSTICS: BASIC PHYSICS, THEORY AND METHODS ~(q) -),+ ~(q) Fig. 3. Integration contours for the inverse Laplace transforms.
Acoustic pressures are also given in decibels (dB) with respect to the reference pressure level and denoted SPL (sound pressure level): SPL ( d B ) - 20 log ( p A / p ~ ) . For a plane wave, the two measures are identical: IL = SPL. One may note that 20 dB is the noise level of a studio room, 40 dB the level of a normal conversation, 60 dB the level of an intense conversation, 90 dB the level of a symphony orchestra, 100 dB the noise level of a pneumatic drill at 2 m, 120 dB the noise level of a jet engine at 10 m, and 130-140 dB the pain threshold for the human ear.