aerodynamic noise
An investigation of aerodynamic noise exposure of motorcycle riders.
... the noise measured at the above speeds is shown by curves A and B of figure ...of noise does not change significantly with flow speed, but the pressure amplitudes increase from an overall 73*2 dBA to 85*5 ...
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Bio inspired Aerodynamic Noise Control: A Bibliographic Review
... bio-inspired aerodynamic noise control has continued for more than sixty ...the noise measurements of flying birds in the field or prepared wings in the wind ...influence, aerodynamic effects ...
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Numerical Investigation on Vortex Structure and Aerodynamic Noise Performance of Small Axial Flow Fan
... and aerodynamic noise of small axial flow fans are explored in the ...broadband noise model is introduced to calculate the distributions of broadband noise sources in fan’s internal flow ...
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Correlation between Aerodynamic Noise and Velocity Fluctuation of Tip Leakage Flow of Axial Flow Fan
... fan noise and velocity fluctuations of tip leakage flow around rotor blade of a low pressure axial flow fan in the cases of the design and off design ...the aerodynamic noise are made using a ...
7
The Numerical Simulation of Aerodynamic Noise Generated by CRH3 Train’s Head Surface
... 3) In the low frequency region, the acoustic pressure level and the sound pressure level density of the monitor- ing points are higher; in the low frequency region, the acoustic pressure level and the sound pressure ...
8
Numerical Modelling of Aerodynamic Noise in Compressible Flows
... For CAA analysis the transient CFD flow field from 10 –3 s was taken into account and used as a CFD acoustic excitation boundary condition on a common surface. The CAA calculations were carried out with the same time ...
5
Analysis on Physical Mechanism of Sound Generation inside Cavities Based on Acoustic Analogy Method
... intense aerodynamic noise is induced by the impingement in the region near the cavity rear ...The noise radiates from the cavity rear wall to the front region of the cavity, and the sound feedback ...
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Sound Source Localisation for a High-Speed Train and Its Transfer Path to Interior Noise
... interior noise is only investigated for the sidewall of a high- speed ...the noise transmissions from the interior to the exterior and in the opposite direction are equiv- alent, which is not necessarily ...
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Fan Noise Control and Heat Dissipation Optimization of Commercial Vehicle Cooling System
... fan noise and heat dissipation in a commercial vehicle cooling system, it is proposed to reduce noise by changing the fan structure and to increase the windshield to block the hot air ...and ...
8
Determination of Aerodynamic Sound Sources on Periodicity Noise Generated from a Micro Wind Turbine
... The spectrum distribution of the pressure fluctuation at the leading edge is shown in Figure 11. When the mainstream velocity increases, the periodical phenomena fluctuate in the high-frequency domain. This tendency ...
8
Research into aerodynamic modulation of wind turbine noise: final report
... frequency noise emission from windfarms were ...frequency noise, but by amplitude modulation of aerodynamic noise (AM) from the wind ...indicates aerodynamic noise from wind ...
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Optimal Shape Design of Medium Speed Train based on Aerodynamics Performance
... only aerodynamic performance, but also aerodynamic noise ...reduce aerodynamic barriers to a certain ...considering aerodynamic obstacles, the S-S train model is the best, whereas if ...
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Into thin air: contributions of aerodynamic and inertial elastic forces to wing bending in the hawkmoth Manduca sexta
... is angular stroke amplitude, ω is angular frequency, L is wing span and g is earth’s gravitational acceleration. The ratio of wing to body mass in insects has been shown to vary from 0.5% in bees to 6% in hawkmoths ...
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An Experimental Determination of the Relationship between Lift and Aerodynamic Power in Calliphora Erythrocephala and Phormia Regina
... In either case calculations of aerodynamic power and lift from measured air velocities indicate that the aerodynamic power of Calliphora and Phormia is between 2 and 30 kcal/kg h, a rang[r] ...
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Design and CFD Analysis of Aerodynamic of a Car with Various Aerodynamic Devices Udayagiri Lingaiah, B Venkat Narayana & Ch Ashok
... implemented aerodynamic device which is known as cut section of wing on ceiling of a ...the aerodynamic device generates sensible lift force which tries to pull the car from ground and the weight of car ...
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REVIEW ON VEHICULAR SPEED, DENSITY ESTIMATION AND CLASSIFICATION USING ACOUSTIC SIGNAL
... Abstract: Traffic monitoring and parameters estimation from urban to non urban (battlefield environment) traffic is fast-emerging field based on acoustic signals. We present here a comprehensive review of the ...
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The energetic cost of variations in wing span and wing asymmetry in the zebra finch Taeniopygia guttata
... the aerodynamic models and care must be taken when using models for birds that are in moult or have undergone stresses, which have a different wing shape from the ...
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Flutter and response of composite wind turbine blade with bending torsional coupling
... simple aerodynamic model used for classical flutter and a reduced nonlinear aerodynamic model suitable for constant pitch motion for stall flutter are used in order to investigate quickly a wide range of ...
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Issues in the design of switched linear systems: a benchmark study
... deviation of the rate of change of the pitch angle reflects the actuator activity over the medium and long term and is required to remain less than (0.4V-1.8) deg/s over the operating range of mean wind speeds up to 24 ...
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Aerodynamic Study On An Aircraft
... only aerodynamic control surfaces, seen to be successful case of the high- and moderate- α trims, but leaves airplane in a wing rock-like limit cycle oscillation about the low-the o trim ...only aerodynamic ...
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