By J. E. Moore F.R.I.B.A. (auth.)
ISBN-10: 0333242939
ISBN-13: 9780333242933
ISBN-10: 1349160350
ISBN-13: 9781349160358
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Sample text
It should also be noted that sound waves reflected from a concave surface, unlike those reflected from a flat or convex surface, may actually increase in intensity the further they travel. In the example illustrated they will pass through a region of focus in which the sound heard may be as loud as that heard near the source. 18 Reflectors of Limited Size For effective sound reflection to occur a reflector must be large in relation to the wavelength of the sound and, in all cases, the power of the reflected sound will be affected by diffraction at the edges of the reflector.
The second category of aerodynamic noise is the sudden expansion of gas, such as occurs in an explosion, which sets up a pressure wave of, normally, very high intensity. 5 em cannon is about 140dBat5m. Repeated explosions, such as occur in an internal combustion engine, create a sustained noise by way of the exhaust system, in addition to setting up vibrations in the associated parts of the engine.
Reverberation Subjectively, reverberation can be defined as the continuation of audible sound in an enclosed space after the sound source has been cut off. It is a familiar phenomenon in large rooms containing few sound-absorbing materials, such as churches, where reverberation can be heard lasting five or more seconds. When a pulse of sound is generated in an enclosed space two phenomena may occur. 25. Superimposed on this random scattering of sound will be, in the case of rooms having parallel reflecting surfaces, a standing wave pattern of those sounds which have wavelengths related to the dimensions of the room.
Design for Good Acoustics and Noise Control by J. E. Moore F.R.I.B.A. (auth.)
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