Results 311 to 320 of about 2,264,525 (339)
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Journal of the Air Pollution Control Association, 1973
The national Environmental Protection Agency is expected to issue its recommendations on noise legislation some time during the latter part of 1973. This agency will assume primary responsibility for enforcing noise limits on new products, such as vehicles, construction equipment, electrical equipment, etc.
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The national Environmental Protection Agency is expected to issue its recommendations on noise legislation some time during the latter part of 1973. This agency will assume primary responsibility for enforcing noise limits on new products, such as vehicles, construction equipment, electrical equipment, etc.
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Noise controller which noise-controls movable point
The Journal of the Acoustical Society of America, 1994A noise controller which noise-controls a movable point so that a noise generated from a noise source and transmitted to the movable point can be reduced. The noise controller filters the noise in accordance with a least mean square algorithm and generates an antinoise to be collided with the noise so that the antinoise and the noise can cancel each ...
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Noise Control for Electric Motors
American Industrial Hygiene Association Journal, 1969Abstract The rerating of motors to pack more horsepower into smaller frames, the trend to larger motors, and the increasing use of 3600-rpm pumps direct-coupled to motors have created noise problems in process areas. In-plant studies have been made on the effects of frame size and type, enclosure, horsepower, and rotational speed.
Stanley H. Judd, John A. Spence
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Active noise control systems for controlling outdoor environmental noise
1999 European Control Conference (ECC), 1999A unique theory for generating electronically controlled acoustic shadows for environmental noise reduction was reported in [1]. The theory has been extended to complex high frequency sound from large non-compact sources [2] and implemented into hardware [3]. These studies show that deep acoustic shadows are possible.
H. Atmoko, S. E. Wright
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Down with noise [active noise control]
IEEE Spectrum, 1999Annoying noise in the passenger cabins of propeller aircraft, the rumble in air-conditioning systems, and the sounds disrupting headset communication are being reduced these days by active noise control, thanks to advances in digital signal processing. The technique relies on the principle of destructive interference between two sound fields, one field
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Identification of a space noise control model and active noise control
The Journal of the Acoustical Society of America, 1995In order to get the mathematic model of a noise control system in space, which is the impulse response of a speaker–microphone system, a square impulse modulated by a single frequency signal has been used. In the paper, a pseudorandom correlation identification method is used to get the impulse response of a MIMO speaker microphone system in the ...
Yan Jiong Zhong +2 more
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Noise, anti-noise and fluid flow control
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2002This paper celebrates Thomas Young's discovery that wave interference was responsible for much that is known about light and colour. A substantial programme of work has been aimed at controlling the noise of aerodynamic flows. Much of that field can be explained in terms of interference and it is argued in this paper that the theoretical techniques for
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Electric Motor Noise: Control of Noise at the Source
American Industrial Hygiene Association Journal, 1970The desired output of most electric motors is mechanical torque. Unfortunately, this output is usually accompanied by undesirable outputs such as heat and noise. The noise produced by electric motors (and by other machinery) is rapidly becoming the subject of much concern to designers and operators of industrial equipment as well as to many other ...
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1987
Publisher Summary This chapter presents the assessment of noise control in different conditions. An essential part of noise control is the assessment of the problems that might occur from given noise sources. It may be that the sources are external to a building and the noise penetration into the building has to be controlled or the source may be ...
Duncan Templeton, David Saunders
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Publisher Summary This chapter presents the assessment of noise control in different conditions. An essential part of noise control is the assessment of the problems that might occur from given noise sources. It may be that the sources are external to a building and the noise penetration into the building has to be controlled or the source may be ...
Duncan Templeton, David Saunders
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Engineering Control of Furnace Noise
American Industrial Hygiene Association Journal, 1969Abstract Sound pressure levels around furnaces may be hazardous to hearing, interfere with communications, and annoy occupants in adjoining areas. Burners are the most important but not the sole source of noise. Burner premix and combustion noise are described, and methods of noise control for existing installations are illustrated.
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