On the Accuracy of Nearfield Pressure Predicted by the Acoustic Boundary Element Method

Kang, Sung‐Chon

doi:10.1006/jsvi.1999.2807

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…Finally, the vibration boundary conditions are mapped to the boundary element mesh for noise prediction. According to the wavelength corresponding to the maximum effective analysis frequency is greater than or Shock and Vibration equal to 6 times of the acoustic grid, and the acoustic grid size is determined [22]. e equation is shown as follows:…”

Section: Acoustic Boundary Element Model Of the Scrollmentioning

confidence: 99%

Study on Characteristics of the Vibration and Noise of High‐Power Scroll Compressor

Wang

Yan

et al. 2021

Shock and Vibration

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With the rapid development of a high-power scroll compressor (HSC), the dynamic performance of a scroll compressor has an important impact on the vibration and noise of the whole compressor. So, the dynamic characteristics and structural acoustic radiation characteristics of HSC under dynamic excitation are studied by simulation and experiment in this paper. Firstly, the dynamic simulation model of HSC is established to analyze the time-domain and frequency-domain characteristics of bearing excitation and upper support excitation. At the same time, the finite element models of housing, upper support, and lower support are constructed to analyze the transient dynamic response of housing under the excitation source. Based on the vibration displacement of the housing surface, the prediction model of the housing radiated noise is also established, and then the radiated noise of the housing surface and the noise spectrum of the standardized test points are analyzed. Finally, the accuracy of the prediction model is verified by acoustic experiments. The experimental results show that the vibration and radiation noise of the housing can be accurately predicted by reasonable modeling to calculate the gas force and approximate the actual gas load. The vibration of the housing coupling system is the main source of the vibration characteristics of the HSC. The conclusions of the study can provide a reference for the low noise design of the HSC.

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Section: Acoustic Boundary Element Model Of the Scrollmentioning

confidence: 99%

Study on Characteristics of the Vibration and Noise of High‐Power Scroll Compressor

Wang

Yan

et al. 2021

Shock and Vibration

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“…A modified boundary element formulation based on Helmholtz integral equation has been reported to overcome such problems. 30,31 In our case the minimum distance between field points and source surface for BEM calculations is set to one-half an element length. Expressed in matrix-vector form, the discretized problem becomes…”

Section: A Formation Of the Inverse Bem Transfer Matrixmentioning

confidence: 99%

Sound source reconstruction using inverse boundary element calculations

Schuhmacher¹,

Hald²,

Rasmussen

et al. 2003

The Journal of the Acoustical Society of America

130

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Whereas standard boundary element calculations focus on the forward problem of computing the radiated acoustic field from a vibrating structure, the aim in this work is to reverse the process, i.e., to determine vibration from acoustic field data. This inverse problem is brought on a form suited for solution by means of an inverse boundary element method. Since the numerical treatment of the inverse source reconstruction results in a discrete ill-posed problem, regularization is imposed to avoid unstable solutions dominated by errors. In the present work the emphasis is on Tikhonov regularization and parameter-choice methods not requiring an error-norm estimate for choosing the right amount of regularization. Several parameter-choice strategies have been presented lately, but it still remains to be seen how well these can handle industrial applications with real measurement data. In the present work it is demonstrated that the L-curve criterion is robust with respect to the errors in a real measurement situation. In particular, it is shown that the L-curve criterion is superior to the more conventional generalized cross-validation ͑GCV͒ approach for the present tire noise studies.

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“…Boundary Element Methods (BEM) have been successfully used in the area of acoustic radiation and scattering (see Bai (1992); Kang & Ih (2000a); Kim & Ih (1996); Langrenne & Garcia (1999); Seybert et al (1985); Williams et al (2000)) for three dimensional surfaces.…”

Section: Boundary Mapsmentioning

confidence: 99%

Numerical Methods for Near-Field Acoustic Holography over Arbitrarily Shaped Surfaces

Valdivia¹

2011

Holography - Different Fields of Application

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On the Accuracy of Nearfield Pressure Predicted by the Acoustic Boundary Element Method

Cited by 10 publications

References 4 publications

Study on Characteristics of the Vibration and Noise of High‐Power Scroll Compressor

Study on Characteristics of the Vibration and Noise of High‐Power Scroll Compressor

Sound source reconstruction using inverse boundary element calculations

Numerical Methods for Near-Field Acoustic Holography over Arbitrarily Shaped Surfaces

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