Results 261 to 270 of about 93,849 (292)

Stress analysis of axial flow cooling fans

The Journal of Strain Analysis for Engineering Design, 1982
Tests on automobile radiator cooling fans of three types of construction pressed out from sheets are reported. The blades of the fans are treated as twisted (from tip to root) cantilever beams (fixed at root) for the purpose of analysis. The effects of centrifugal force, driving torque, and the axial thrust over the blade due to air flow are taken ...
V Ramamurti, T Shanmugavel
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Sources of Noise in Axial Flow Fans

The Journal of the Acoustical Society of America, 1971
Experiments and theory relating to fan noise sources are reviewed with emphasis on axial flow machines. At supersonic rotor speeds, the steady shock pattern attached to a rotor is an efficient radiator of sound. In most practical cases of subsonic rotor operation, however, direct radiation from the rotor-locked pressure field is negligible compared ...
B. D. Mugridge, C. L. Morfey
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Active control of axial-flow fan noise

The Journal of the Acoustical Society of America, 1995
An investigation was conducted using active noise control to reduce noise from small axial-flow fan units commonly found in computers and printers. The fan unit itself was used as the cancellation source in the active noise control scheme, achieved by axially modulating the unit with a shaker.
Gerald C. Lauchle, John R. MacGillivray, David C. Swanson   +2 more
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Reversing of Axial Flow Fans for Ventilation

Volume 4: Cycle Innovations; Fans and Blowers; Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Oil and Gas Applications, 2011
Changing the flow direction in fans is frequently required in emergency situations in traffic tunnels, chemical plants and mines ventilation. Reverse flow in axial flow fan is often achieved using two methods: a) Changing direction of fan rotation and turning the stator vanes (Method I).
Vaclav Cyrus, Jiri Pelnar, Jan Cyrus
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Noise generation in axial flow fans

Journal of Sound and Vibration, 1966
Abstract An empirical equation for fan noise is presented. The equation predicts, with fair accuracy, the noise of several fan configurations tested, yielding noise spectra over the frequency range 40 to 10,000 Hz at various fan speeds and over the measurable range of fan performance characteristics.
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Prediction of Axial Flow Fan Noise Spectrum

Noise Control and Acoustics: Volume 1 — Active Noise and Vibration Control; Complexity in Acoustics; Noise Sources in Internal Combustion Engines; Vehicle Flow/Structure Noises; Aeroacoustic Sound Propagation in Ducts and Jets; Turbomachinery Noise; BS/MS Student Paper Competition, 1996
Abstract This paper presents a semi-empirical formula for predicting the noise spectra of axial flow fans in a free field. The basic assumption made in deriving this formula is that sound radiation from an axial flow fan in a free field is primarily due to the fluctuating pressure exerted on the fan blade surface.
Shigong Su, Sean F. Wu, Hemant Shah
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Noise and Efficiency of Axial-Flow Fans

SAE Technical Paper Series, 1970
<div class="htmlview paragraph">A test apparatus was constructed and instrumented for testing tractor engine cooling fans in an environment simulating actual operating conditions. Tests were conducted to investigate the influence of the blade pitch angle, blade camber and fan rotational speed on the air delivery performance, the input power ...
J. W. Hummel, J. A. Weber
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Blade shape optimization for transonic axial flow fan

Journal of Mechanical Science and Technology, 2015
Transonic axial flow fan has relatively high blade tip speed and produces higher pressure ratio than the subsonic. However, considerable losses are brought about by the shock waves close to blade tip and over part of span, leading to deteriorated overall efficiency and operating flow range.
Peng Song, Jinju Sun
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Generator Fan Test Facility to Quantify Axial Flow Fan Aerodynamic Performance

ASME 2010 Power Conference, 2010
The General Electric fan test facility has been re-installed and commissioned in the Laboratory for Noise and Vibration Control Research, located on the second floor of the Jonsson Engineering Center (JEC 2110) in the Department of Mechanical, Aerospace and Nuclear Engineering at Rensselaer Polytechnic Institute, Troy NY. RPI provides a unique venue to
A. I. C. Hunter, H. A. Scarton, K. R. Wilt, S. A. Salamah, D. Story   +4 more
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Shaping Sound Frequency Spectra of Axial Flow Fans

SAE Technical Paper Series, 1975
<div class="htmlview paragraph">An analytical description of the sound pressure radiated aerodynamically by axial flow engine cooling fans is developed using semiempirical methods. Mathematical manipulation and digital computer techniques are employed to yield complete time and frequency sound pressure spectrums and overall sound pressure levels (
Kent C. Bates, Roger R. Yoerger
openaire   +1 more source