Combination of Finite and Boundary Element Methods in Investigation and Prediction of Load-Controlled Noise of Power Transformers

Rausch, Martin; Kaltenbacher, Manfred; Landes, H.; Lerch, Reinhard; Anger, Jan; Gerth, Jeffrey M.; Boss, P.

doi:10.1006/jsvi.2001.3934

Cited by 47 publications

(24 citation statements)

References 8 publications

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“…The anechoic termination was implemented by using the free field impedance Z = ρc on S 4 . The sound pressure in the duct was determined using (16) and (17) and the transmission coefficient was computed using (20). To validate the numerical model, the results of the simulation were compared with the results of a measurement.…”

Section: Thin Plate In a Ductmentioning

confidence: 99%

“…the radiation of a dipole source and the second example is a more applied one, which is the computation of the horn effect in tyre noise determination. Other and diverse examples of the applications of the BEM can be found in the literature, for example the calculation of sound radiation of an engine transmission cover (Tinnsten et al, 2001), the prediction of noise of power transformers (Rausch et al, 2002), the study of sound distribution in urban areas (Baulac et al, 2006) or the estimation of the transmission loss of a sound barrier (Monazzam et al, 2010), to mention only a few.…”

Section: Introductionmentioning

confidence: 99%

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Acoustical Boundary Elements: Theory and Virtual Experiments

Piscoya

Ochmann

2015

Archives of Acoustics

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This paper presents an overview of basic concepts, features and difficulties of the boundary element method (BEM) and examples of its application to exterior and interior problems. The basic concepts of the BEM are explained firstly, and different methods for treating the non-uniqueness problem are described. The application of the BEM to half-space problems is feasible by considering a Green's Function that satisfies the boundary condition on the infinite plane. As a special interior problem, the sound field in an ultrasonic homogenizer is computed. A combination of the BEM and the finite element method (FEM) for treating the problem of acoustic-structure interaction is also described. Finally, variants of the BEM are presented, which can be applied to problems arising in flow acoustics.

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Section: Thin Plate In a Ductmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustical Boundary Elements: Theory and Virtual Experiments

Piscoya

Ochmann

2015

Archives of Acoustics

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“…In this paper, the equivalent heat transfer resistance network is employed. The equivalent heat transfer resistance to the heat convection and radiation according to the Newton's law of cooling can be expressed as (12) where h c and h r are the convection and radiation heat-transfer coefficient, A t is the external surface area of the core and windings.…”

Section: Thermal Modelingmentioning

confidence: 99%

“…While the audible noise N c is proportional to the weight of core , the length of core and the magnetic flux density , and can be summarized as N c [12].…”

Section: Magnetostriction Core Vibration and Audible Noisementioning

confidence: 99%

Comparison of electromagnetic performances of amorphous and nanocrystalline core-based high frequency transformers

Liu

Wang

Islam

et al. 2014

2014 17th International Conference on Electrical Machines and Systems (ICEMS)

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Amorphous and nanocrystalline alloys show attractive magnetic properties, and can be the excellent choice to develop the cores of high-frequency high-power transformers used in high-power density renewable power generation systems. However, the electromagnetic design of high-frequency power transformers is a multi-physics problem and thereby affects the system efficiency and cost. In this paper, four high frequency transformers are optimally designed with amorphous and nanocrystalline alloy-based cores and electromagnetic performances are evaluated by finite element method. The results are analyzed and found their huge potentiality for future smart grid applications.Index Terms -high-frequency transformers; amorphous and nanocrystalline alloys; optimal design; finite element method

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“…The presence of insulation, whose rigidity is about two hundred times less than for copper, is most important when deformations in axial direction are considered. The proper estimation of these phenomena is important for the analysis of the winding resistance against operational short-circuit [1] and also for the winding vibration at load [2][3][4][5][6]. In either case arises the question of introducing an equivalent material for the winding area because the exact representation of complex geometry and material heterogeneity would require unacceptable computational effort.…”

Section: Introductionmentioning

confidence: 99%