Analysis of interior acoustic fields using the finite element method and the boundary element method

Kopuz, Şadi; Lalor, N.

doi:10.1016/0003-682x(94)00045-w

Cited by 38 publications

(21 citation statements)

References 7 publications

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“…Conversely, one should not forget the importance of analytical frameworks developed by early researchers since the success of computational software is built based on them. Extensive literature can be referred to for interested readers to understand the analytical aspect of numerical methods [Dhandole and Modak, 2007;Dowell et Everstine, 1997;Kipp and Bernhard, 1987;Kopuz and Lalor, 1995;Cheng, 1997, 1999;Nefske et al, 1982;Pan et al, 1999;Petyt and Koopmann, 1977;Richards and Jha, 1979;Sestieri et al, 1984;Shuku and Ishihara, 1973;Succi, 1987;Wu et al, 2000]. Generally, there are three main numerical methods that are adopted widely by the industry for cabin noise prediction.…”

Section: Methodsmentioning

confidence: 99%

“…The work is limited to the tuned frequency of the HR, which is dependent on the volume of the boot compartment and the opening area of the slit. Optimization studies are conducted to account for these parameters [Kamci, 2009;Kopuz and Lalor, 1995]. Generally, in automobile design, the volume of the boot compartment is usually optimized for maximum room space.…”

Section: Helmholtz Resonatormentioning

confidence: 99%

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Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Ang

Koh²,

Lee

2016

Int. J. Appl. Mechanics

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The aim of this paper is to provide an overview of the existing industrial practices used for cabin noise control in various industries such as automotive, marine, aerospace, and defense. However, emphasis is placed on automobiles and armored vehicles. Generally, automobile cabins usually constitute of thin structural panels, where the fundamental frequency typically falls below 200[Formula: see text]Hz. If a specific structural mode couples with a specific acoustic mode of the cabin, booming noise occurs. As such, discomfort may be felt by the occupants. Fundamentally, vibroacoustics problems may be minimized if the acoustic modes and the structural modes are decoupled, which is achieved usually by structural modifications or acoustical treatments. However, if excessively performed, the weight limitation of an automobile design will be exceeded; not to mention the adverse effect of increased weight on several factors such as fuel efficiency, mileage life of tires and acceleration of the vehicle. Moreover, current solutions have several drawbacks in low frequency noise control. In light of this, it is of great interest to explore the feasibility of acoustic metamaterials as an alternative with hope to improve cabin noise.

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Section: Methodsmentioning

confidence: 99%

Section: Helmholtz Resonatormentioning

confidence: 99%

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Ang

Koh²,

Lee

2016

Int. J. Appl. Mechanics

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“…Further analysis or applications of the method are described in Seybert and Cheng [78], Cheng et al [19] and Kopuz and Lalor [53]. In this Chapter the application of the BEM to the interior acoustic problem is developed further so that the solution with a general boundary, boundary condition and incident field can be obtained.…”

Section: Chaptermentioning

confidence: 99%

The Boundary Element Method in Acoustics

Kirkup¹

2000

Journal of Computational Acoustics

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“…However, that solution remains limited to simple cases and can definitely not be considered for real open-plan workspace situations. (2) The volume or surface integral methods [Finite Element Method (FEM) or Boundary Element Method] that are based on the resolution of the Helmholtz equation or its integral form (Kopuz and Lalor, 1995). They make it necessary to subdivide the volume or the surface area delimiting the room (walls, ceilings, and floors) and the surface area of the interior furniture and equipment into small elements.…”

Section: Introductionmentioning

confidence: 99%

Implementation of diffraction in a ray-tracing model for the prediction of noise in open-plan offices

Chevret

Châtillon²

2012

The Journal of the Acoustical Society of America

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Sound prediction in open-plan offices is a real challenge because of the complexity of the layout of such offices, and therefore because of the multitude of acoustic phenomena involved. One such phenomenon, of primary importance, and not the least challenging of them, is the diffraction by screens and low dividers that usually partition the workspace. This paper describes implementing the equations of the Uniform Theory of Diffraction [McNamara et al. (1990). Introduction to the Uniform Theory of Diffraction (Artech House, Boston)] in an existing ray-tracing model initially dedicated to sound prediction in industrial premises. For the purposes of validation, a series of measurements was conducted in a semi-anechoic chamber in the same manner as Wang and Bradley [(2002). Appl. Acoust. 63, 849-866] but including real desktops instead of single screens. A first phase was dedicated to controlling the quality of the installation by making comparisons with McNamara's solution for a single screen on a rigid floor. Then, the validation itself was conducted with measurements on real desktops, first without a ceiling, and then with a rigid ceiling suspended above the double desk. The results of the comparisons between calculations and measurements in this configuration have demonstrated that the model is an effective tool for predicting sound levels in an open-plan office.

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Analysis of interior acoustic fields using the finite element method and the boundary element method

Cited by 38 publications

References 7 publications

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

The Boundary Element Method in Acoustics

Implementation of diffraction in a ray-tracing model for the prediction of noise in open-plan offices

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