Analytical model of a mechanically stirred reverberation chamber based on EM field modal expansion

2016 ◽  
Author(s):  
G. Andrieu ◽  
A. Soltane ◽  
A. Reineix
Keyword(s):  
Analytical Model ◽  
Reverberation Chamber ◽  
Modal Expansion ◽  
Em Field

Analysis of Metamaterial Walls Reverberation Chamber by Using Modal Expansion Theory

2021 ◽  
Author(s):  
Jeudy Kean ◽  
Nathalie Raveu ◽  
Hamza Kaouach ◽  
Kosorl Thourn ◽  
Sokchenda Sreng
Keyword(s):  
Reverberation Chamber ◽  
Modal Expansion ◽  
Expansion Theory

Gas Path Sound Transmission in Spherically-Shaped Reciprocating Compressors: Theory and Experiment

1999 ◽  
Vol 121 (1) ◽  
pp. 8-17 ◽  
Author(s):  
F. Pan ◽  
J. D. Jones
Keyword(s):  
Analytical Model ◽  
Design Tool ◽  
Acoustic Characteristics ◽  
Modal Expansion ◽  
Noise Radiation ◽  
Inhomogeneous Wave Equation ◽  
Physical Insight ◽  
Gas Cavity ◽  
The Relationship ◽  
Gas Pulsations

Gas pulsations within the refrigerant gas cavity is one of the principal noise propagating paths in reciprocating compressors. This paper provide a physical insight to the relationship between the gas pulsations inside the cavity and noise radiation of reciprocating compressors. The refrigerant gas cavity of the test compressor is modeled as a space between concentric spherical shells and analyzed with modal expansion techniques. Gas pulsations within the cavity are mathematically represented as the forcing terms of the inhomogeneous wave equation in spherical coordinates. The pressure distribution inside the cavity is then estimated accordingly. Based on the orthogonality principles, the noise radiation patterns associated with the gas pulsations are predicted. Acoustic modal analysis, directivity test and running speed sensitivity test are conducted to identify the acoustic characteristics of cavity and to verify the analytical model. The experimental results are in good agreement with the prediction of the analytical model. Thus, the concentric, spherical shell model well describes the acoustic characteristics of cavity within the test compressor. This model can also be employed as a design tool to analyze the effects of system parameter variation on overall noise radiation.

EM Field Uniformity Analysis of RRA Reverberation Chamber

2020 ◽  
Author(s):  
Jawad Yousaf ◽  
Hosang Lee ◽  
Muhammad Faisal ◽  
Han Junee ◽  
Wansoo Nah ◽  
...  
Keyword(s):  
Reverberation Chamber ◽  
Field Uniformity ◽  
Em Field
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