By Michael Möser
Engineering Acoustics makes a speciality of simple recommendations and strategies to make our environments quieter, either in structures and within the open air.
The author’s educational kind derives from the conviction that realizing is better whilst the need at the back of the actual educating strategy is made transparent. He additionally combines mathematical derivations and formulation with large reasons and examples to deepen comprehension.
Fundamental chapters at the physics and belief of sound precede these on noise aid (elastic isolation) tools. The final bankruptcy bargains with microphones and loudspeakers.
Moeser contains significant discoveries by means of Lothar Cremer, together with the optimal impedance for mufflers and the accident influence 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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Additional resources for Engineering Acoustics: An Introduction to Noise Control (2nd Edition)
Force F(t) mass m ξ(t) displacement ξ(t) F(t) t Fig. 3. Free mass and exemplary force-time characteristics with resulting displacement-time characteristics Obviously, two di↵erent sorts of speed must be distinguished here. One is the ‘migration speed’ of the pulse through the wave guide. It is called propagation speed or wave speed, denoted in this book by c. The other one, which has to be distinguished from c, is the speed at which the local gas masses move around their equilibrium position, as the wave ‘runs through’ them.
25 0 Fig. 8. Space-dependent sound pressure in a standing wave at multiple constant times. Half a period is shown. As described above, resonance phenomena can be explained by the presence of multiple reflections at both ends of the tube. Furthermore, let us assume that the one-dimensional gas continuum is excited by a single in-phase oscillating surface at the location x = l. The velocity of the surface v0 is therefore independent of y. Of course, the velocity of the single oscillating surface must be equal to that of the sound field.
28) provides a simple answer to the remaining question of how the sound source leaves its ”footprint” on the signal form of the sound pressure f (t). 28) v(x, t) = p(x, t)/%0 c = f (t x/c)/%0 c . The velocity of the medium v must be equal to the velocity of the membrane at the position of the source x = 0, therefore f (t)/%0 c = vM (t) , according to which sound pressure p(x, t) = %0 cvM (t and sound velocity v(x, t) = vM (t in the wave guide are simply x/c) x/c) 32 • • 2 Fundamentals of wave propagation defined by the source signal ’membrane velocity vM (t)’ and by the existence of progressive waves in this situation.