Scattering/diffraction effects of a sound intensity probe incorporating direct particle velocity measurements

1988 ◽  
Vol 83 (S1) ◽  
pp. S92-S92
Author(s):  
G. Krishnappa
Keyword(s):  
Particle Velocity ◽  
Sound Intensity ◽  
Velocity Measurements ◽  
Diffraction Effects

Experimental Characterization of a Car Window Excited by Turbulent Flow Using Scanning Sound Intensity Techniques

2012 ◽  
Author(s):  
Daniel Fernandez Comesaña ◽  
Eduardo Latorre Iglesias ◽  
Malcolm Smith ◽  
Hans-Elias de Bree
Keyword(s):  
Turbulent Flow ◽  
Particle Velocity ◽  
Automotive Industry ◽  
Sound Intensity ◽  
Aerodynamic Noise ◽  
Experimental Characterization ◽  
Velocity Measurements ◽  
Radiated Sound ◽  
Radiated Sound Power

Reducing the aerodynamic noise produced by turbulent flow exciting a car window is one of the current noise control challenges in the automotive industry. Flow separation and later reattachment into a turbulent boundary layer and turbulent wake occur because of flow over the A-pillar and the wing mirror. Experiments have been carried out to represent an idealised wing mirror noise problem using flow over a half cylinder exciting a flat plate. A scanning P-U (pressure-particle velocity) probe was used to measure various aspects of the window response and sound radiation, including the energy distribution of the vibrating surface, the total radiated sound power and hence the radiation efficiency. In addition, experimental results showed that the operational deflection shapes of the car window can be visualized by using scanning particle velocity measurements, obtaining similar results as with step-by-step measurements using a roving accelerometer. The scanning sound intensity maps also proved to be helpful for detecting weaknesses of the initial experimental setup as part of the experimental optimization.

The Application of Single Vector Sensor in Direction Tracing of Water-Entry Object

2013 ◽  
Vol 341-342 ◽  
pp. 601-604
Author(s):  
Di Xiao ◽  
Lan Yue Zhang
Keyword(s):  
Signal Processing ◽  
Particle Velocity ◽  
Sound Intensity ◽  
Water Entry ◽  
Azimuth Angle ◽  
Velocity Signal ◽  
Complex Sound ◽  
Simulating Experiment ◽  
Vector Sensor ◽  
Vector Signal

Water-entry signal was important to broadcast the water-entry object. The vector sensor could gain the pressure and particle velocity signal, so the azimuth angle of water-entry signal could be estimated by single vector sensor. The complex sound intensity method was applied in vector signal processing in azimuth estimation. The estimated deviation in different SNR was give out via simulating experiment. The method was used in the experiment on the lake and was proved to be effective.

Prediction of aerodynamically generated sound via 3D particle velocity measurements

2005 ◽  
Vol 117 (4) ◽  
pp. 2533-2533
Author(s):  
Sean Wu ◽  
Aditya Kumar ◽  
Zhi Ni ◽  
Hans‐Elias de Bree
Keyword(s):  
Particle Velocity ◽  
Velocity Measurements

Effects of weak layers on particle velocity measurements

1997 ◽  
Vol 30 (1) ◽  
pp. 1-18 ◽  
Author(s):  
W. I. Fourney ◽  
R. D. Dick ◽  
X. J. Wang ◽  
T. A. Weaver
Keyword(s):  
Particle Velocity ◽  
Velocity Measurements
Sign in / Sign up

Export Citation Format

Share Document