scholarly journals Broadband multizone sound rendering by jointly optimizing the sound pressure and particle velocity

2018 ◽  
Vol 143 (3) ◽  
pp. 1477-1490 ◽  
Author(s):  
M. Buerger ◽  
C. Hofmann ◽  
W. Kellermann
Keyword(s):  
Particle Velocity ◽  
Sound Pressure ◽  
Sound Rendering

Development of Particle Velocity Transfer Path Analysis

2012 ◽  
Author(s):  
Akira Inoue ◽  
Yosuke Tanabe
Keyword(s):  
Path Analysis ◽  
Particle Velocity ◽  
Velocity Vector ◽  
Degrees Of Freedom ◽  
Sound Pressure ◽  
Simple Method ◽  
Transfer Path ◽  
Rank Ordering ◽  
Transfer Path Analysis ◽  
Velocity Transmission

The transfer path analysis (TPA) in terms of sound pressure has been implemented for decades in many application areas, such as car, train and construction machine. In this article, we propose a transfer path analysis where particle velocity is employed as the measure of TPA. Sound pressure is a scalar quantity, while particle velocity, which is the other fundamental quantity of sound, is a vector quantity. The phase differences among particle velocity vector components have to be generally considered. For TPA, not only the six degrees-of-freedom of each path motion, but also the three degrees-of-freedom of the particle velocity at the receiver location have to be considered together for an effective path rank ordering. We first propose the formulation of the particle velocity transfer path analysis where the same formulation of the standard sound pressure transfer path analysis is assumed to hold true for each direction of particle velocity. In order to verify the proposed particle velocity transfer path analysis, we carry out an experiment using a simple test box structure. As a result we have found that the error in the particle velocity vector synthesis is acceptably small, and is as small as the error in the standard sound pressure synthesis, which indicates that the same synthesis method can be employed. We then perform rank ordering of the particle velocity transmission paths. Here, a simple method of path rank ordering is applied. Lastly, we briefly discuss sound energy as a measure of TPA.

Vector Ocean Ambient Noise Spectrum Simulation Based on Parabolic Equation Model in Shallow Water

2017 ◽  
Vol 25 (02) ◽  
pp. 1750034
Author(s):  
Liufang Fu ◽  
Peng Li ◽  
Xinhua Zhang ◽  
Shuqing Ma ◽  
Chengzhi Gao
Keyword(s):  
Parabolic Equation ◽  
South China Sea ◽  
Particle Velocity ◽  
South China ◽  
Ambient Noise ◽  
Sound Pressure ◽  
Noise Spectrum ◽  
China Sea ◽  
Simulation Results ◽  
Horizontal Particle

Ocean ambient noise spectrum is one of the most important characteristics of ambient noise. An ocean vector ambient noise field model was built up based on parabolic equation in this paper. Then the spectra of sound pressure, horizontal particle velocity and vertical particle velocity were calculated applying the model considering noise sources well distributed on the surface with typical summer sound speed profile in South China Sea. The simulation results showed that spectra of sound pressure, horizontal particle velocity and vertical particle velocity were obviously not varied with depth. Then, the simulated results were compared with the experiment results at the receiving depth of a trail in South China Sea in July 2012. Compared with the experimental results, the simulation results are consistent well with the experimental one of sound pressure and horizontal particle velocity in the trend. But the simulation values at low frequency band below 500[Formula: see text]Hz, are not consistent with the experimental one very well, in the band the simulation results are lower than the experimental by about 3–5[Formula: see text]dB. But the simulation result of vertical particle velocity was not consistent with the experimental one, illustrating that the precision of the model might not be enough in the vertical direction.

Optimal Design of the Thickness of the Multi-Layer Homogeneous Absorption Plates Based on the Max Absorption Coefficient of the Automotive Body

2011 ◽  
Vol 201-203 ◽  
pp. 2108-2112
Author(s):  
Cong Yun Zhu
Keyword(s):  
Optimal Design ◽  
Theoretical Analysis ◽  
Absorption Coefficient ◽  
Particle Velocity ◽  
Sound Wave ◽  
Sound Pressure ◽  
Continuity Condition ◽  
Homogeneous Structure ◽  
Automotive Body ◽  
Multiple Layer

In this paper, the thickness of the different layer of the multiple-layer homogeneous structure. is optimized designed on the condition that the absorption effort is the best Using the transfer matrix of sound pressure and particle velocity of each layer and the continuity condition at the interface between two lagers, the absorption coefficient of the multiple-layer homogeneous structure is deduced. According to the absorption coefficient, the thickness of different layer is optimized designed on the condition that the absorption effort is the best when the sound wave incident to the multiple-layer homogeneous structure with different frequency. In the last, an experiment is carried out, and the experiment results test the theoretical analysis is correct which can be applied to solve the same kind problem.

The Realization for Sound Pressure Unit Using Laser Doppler Anemometry in a Travelling Wave Tube

2012 ◽  
Vol 239-240 ◽  
pp. 57-64
Author(s):  
Liang Jie Li ◽  
Long Biao He ◽  
Xue Jing Wang ◽  
Ping Yang
Keyword(s):  
Acoustic Field ◽  
Particle Velocity ◽  
Sound Pressure ◽  
Laser Doppler Anemometry ◽  
Function Analysis ◽  
Travelling Wave ◽  
Laser Doppler ◽  
Doppler Signal ◽  
Wave Tube ◽  
Pressure Unit

Abstract. To realize the sound pressure unit directly, the method of sound pressure measurement based on acoustic particle velocity was described. In order to get a simple acoustic field, a travelling wave tube was designed. The sound pressure distribution obtained by microphone along the tube was measured. The result showed the acoustic field inside the tube could be considered as travelling wave and the sound pressure is equal to the product of the air density, sound speed and the particle velocity. The laser Doppler Anemometry was used to measure the particle velocity in the acoustic field. The modulated Doppler signal was obtained by measurement system. With the spectral analysis of Doppler signal and the signal model, the particle velocity was obtained with the Bessel function analysis. The comparison of sound pressure measured by microphone and the value deduced from the velocity measured by laser Doppler system shows that deviations between two methods were 0.04 dB at 650 Hz and discrepancies were less than 0.34 dB at frequencies from 300 Hz to 1k Hz.

Optimal Design of the Thickness of the Multi-Layer Absorption Plates Based on the Max Absorption Coefficient

2013 ◽  
Vol 834-836 ◽  
pp. 634-639
Author(s):  
Da Yu Huang
Keyword(s):  
Optimal Design ◽  
Theoretical Analysis ◽  
Absorption Coefficient ◽  
Particle Velocity ◽  
Sound Wave ◽  
Sound Pressure ◽  
Continuity Condition ◽  
Homogeneous Structure ◽  
Optimized Design ◽  
Multiple Layer

In this paper, the thickness of the different layer of the multiple-layer homogeneous structure. is optimized designed on the condition that the absorption effort is the best Using the transfer matrix of sound pressure and particle velocity of each layer and the continuity condition at the interface between two lagers, the absorption coefficient of the multiple-layer homogeneous structure is deduced. According to the absorption coefficient, the thickness of different layer is optimized designed on the condition that the absorption effort is the best when the sound wave incident to the multiple-layer homogeneous structure with different frequency. In the last, an experiment is carried out, and the experiment results test the theoretical analysis is correct which can be applied to solve the same kind problem. Keywords: absorption coefficient multiple-layer absorption optimized design

scholarly journals Sound field separation with sound pressure and particle velocity measurements

2012 ◽  
Vol 132 (6) ◽  
pp. 3818-3825 ◽  
Author(s):  
Efren Fernandez-Grande ◽  
Finn Jacobsen ◽  
Quentin Leclère
Keyword(s):  
Particle Velocity ◽  
Sound Pressure ◽  
Sound Field ◽  
Velocity Measurements ◽  
Field Separation

Herring Behaviour in the Dark: Responses to Stationary and Continuously Vibrating Obstacles

1985 ◽  
Vol 65 (4) ◽  
pp. 1031-1049 ◽  
Author(s):  
J. H. S. Blaxter ◽  
R. S. Batty
Keyword(s):  
Particle Velocity ◽  
Lateral Line ◽  
Sound Source ◽  
Sound Pressure ◽  
Visual Stimuli ◽  
Avoidance Behaviour ◽  
Infra Red ◽  
Stationary Obstacles

The behaviour of herring subjected to stationary and vibrating obstacles in their swimming path was recorded in daylight and darkness using an infra-red sensitive TV system. The herring avoided stationary obstacles using visual stimuli and usually collided with such obstacles in darkness. They showed strong avoidance to a continuously vibrating sound source in darkness but the speed of turning was relatively slow and there was no evidence for habituation. As they approached the source they usually responded when the sound pressure reached 10–20 Pa, about 70 dB above the threshold. Particle velocity within the lateral line canals was calculated and was 40–60 dB above threshold. Herring seem to be able to adapt their avoidance behaviour to suit the urgency of the situation.

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