Community Noise Impact Planning for a Very Large Wind Tunnel

1973 ◽  
Vol 54 (1) ◽  
pp. 323-323 ◽  
Author(s):  
Kenneth J. Plotkin
Keyword(s):  
Wind Tunnel ◽  
Community Noise ◽  
Noise Impact ◽  
Impact Planning ◽  
Large Wind

China's Large Wind Tunnel

1939 ◽  
Vol 11 (9) ◽  
pp. 315-350
Author(s):  
F.L. Wattendorf
Keyword(s):  
Wind Tunnel ◽  
Large Wind

An overview of experiments on the dynamic sensitivity of MAVs to turbulence

2010 ◽  
Vol 114 (1158) ◽  
pp. 485-492 ◽  
Author(s):  
A. Watkins ◽  
M. Thompson ◽  
M. Shortis ◽  
R. Segal ◽  
M. Abdulrahim ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Micro Air Vehicles ◽  
Rating System ◽  
Flight Tests ◽  
Wind Environment ◽  
Turbulent Wind ◽  
High Turbulence ◽  
Per Se ◽  
Rotary Wing ◽  
Large Wind

Abstract Aspects of the turbulent wind environment Micro Air Vehicles (MAVs) experience when flying outdoors were replicated in a large wind tunnel. An overview of the facility, instrumentation and initial flight tests is given. Piloting inputs and aircraft accelerations were recorded on fixed and rotary wing MAVs and for some tests, measurements of the approach flow (u,v,w sampled at 1,250Hz at four laterally disposed upstream locations) were made. The piloting aim was to hold straight and level flight in the 12m wide × 4m high × ~50m long test section, while flying in a range of turbulent conditions. The Cooper-Harper rating system showed that a rotary craft was less sensitive to the effects of turbulence compared to the fixed wing craft and that while the fixed wing aircraft was relatively easy to fly in smooth air, it became extremely difficult to fly under high turbulence conditions. The rotary craft, while more difficult to fly per. se., did not become significantly harder to fly in relatively high turbulence levels. However the rotary craft had a higher mass and MOI than the fixed wing craft and further work is planned to understand the effects of these differences.

Control of Rapid Transit Propulsion System Noise

1984 ◽  
Vol 106 (2) ◽  
pp. 270-277
Author(s):  
P. J. Remington ◽  
N. R. Dixon
Keyword(s):  
High Speed ◽  
Propulsion System ◽  
Laboratory Model ◽  
Rapid Transit ◽  
Blade Passage ◽  
Community Noise ◽  
System Noise ◽  
Cooling Fan ◽  
Urban Rail ◽  
Noise Impact

An extensive series of diagnostic measurements was carried out on an urban rail propulsion system of the type that was found to have the greatest community noise impact. At high speed, 3000 to 4000 rpm, the fan dominates all other sources by 10–15 dBA. At low speed, 1000 to 1500 rpm, fan, gears, and drive motors make comparable noise. A series of tests on a laboratory model of the fan/end housing of a Westinghouse 1447 propulsion motor showed that by modifying the geometry of the end housing posts and reducing the diameter of the cooling fan, the tone at the blade passage frequency was virtually eliminated. In addition, the overall noise was reduced by over 10 dBA while the same airflow was maintained through the fan. When these treatments were applied to the motor itself, it was possible to maintain the same airflow as in the unmodified motor by redesigning the grill over the inlet at the commutator end of the motor. Noise reductions, however, were not as significant as in the laboratory model. Although the blade passage tone was virtually eliminated, overall noise reduction was in the 3 to 6 dBA range, depending on the combination of treatments used.

scholarly journals Superconducting electromagnets for large wind tunnel magnetic suspension and balance systems

1985 ◽  
Vol 21 (2) ◽  
pp. 444-447 ◽  
Author(s):  
R. Boom ◽  
Y. Eyssa ◽  
G. McIntosh ◽  
M. Abdelsalam ◽  
R. Scurlock ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Magnetic Suspension ◽  
Large Wind
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