Investigations of Sunroof Buffeting in an Idealised Generic Vehicle Model - Part I: Experimental Results

Islam, Moni; Decker, Friedhelm; Hartmann, Michael; Jäger, Anke; Lemke, Timo; Ocker, Joerg; Schwarz, V.; Ullrich, Frank; Schröder, Andreas; Heider, André

doi:10.2514/6.2008-2900

Cited by 16 publications

(6 citation statements)

References 9 publications

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“…The experimental measurements were performed under semi-free field conditions in the acoustic wind tunnel of the BMW group (see Fig. 2), which has a lower cut-off frequency of 50 Hz [25]. Five 1/2 00 free-field condenser microphones were employed for the sound measurements in the interior cabin, e.g.…”

Section: Methodsmentioning

confidence: 99%

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

Nusser

Becker

2021

Acta Acust.

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Part of vehicle interior noise is caused by the complex turbulent flow field behind the a-pillar and side mirror. It excites the structure of the side window, which radiates noise into the interior. Both aerodynamic pressure excitation and acoustic sound sources in the flow play an important role. In this work, the influence of both excitation mechanisms is investigated numerically in a hybrid simulation on a simplified car geometry. The generic model allows for an exact definition of boundary conditions and good reproducibility of simulation results. An incompressible Large-Eddy-Simulation (LES) of the flow is conducted, from which acoustic source terms within the flow field and transient fluid forces acting on the surface of the side window are extracted. This data is used in a coupled vibroacoustic and aeroacoustic simulation of the structure and passenger cabin of the vehicle. A finite element (FE) approach is used for the simulations and detailed modeling of the structure and the influence of interior absorption properties is emphasized. The computed excitation on the side window and the interior noise levels are successfully validated by using experimental data. The importance and contribution of both aerodynamic and acoustic pressure excitation to the interior sound level are determined.

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Section: Methodsmentioning

confidence: 99%

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

Nusser

Becker

2021

Acta Acust.

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“…Dimension of generic vehicle model derived from SAE type 4 body (see online version for colours) Source: Taken fromIslam et al (2008a) …”

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confidence: 99%

Wind noise from A-pillar and side view mirror of a realistic generic car model, DriAver

Ali

Jalasabri

Sood

et al. 2018

IJVNV

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Interior noise of a production car is a total contribution mainly from engine, tyres and aerodynamics. At high speed, wind noise can dominate the total interior noise. Wind noise is associated with the unsteadiness of the flow. For most production cars, A-pillar and side view mirror are the regions where the highly separated and turbulent flows are observed. This study quantifies the wind noise contribution from A-pillar and side view mirror with respect to the interior noise of a generic realistic model, DrivAer. The noise sources are obtained numerically from the flow-structure interactions based on the unsteady Reynolds averaged Navier stokes (URANS) while the noise propagation is estimated using Curle's equation of Lighthill acoustic analogy. The sound pressure frequency spectrum of the interior noise is obtained by considering the sound transmission loss from the side glass by using the mass law for transmission loss. The study found that the noise from the A-pillar is higher than the noise from the side view mirror in the whole frequency range. Near the end of the A-pillar component contributes the highest radiated noise level with up to 20 dB louder than that at the front part of the A-pillar.

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“…Buffeting behaviour of the generic SAE body with sunroof and passenger compartment, comparing the baseline configuration (aluminum structure) with modified sunroof and floor panels -taken from Islam3 …”

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confidence: 99%

Aero-Vibroacoustic Fully Coupled Prediction of Panel Impedance Effects in Sunroof Buffeting

Mendonça

Tran

Shaw

et al. 2011

17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)

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This paper deals with aero-vibroacoustical effects on the sunroof panel of an automobile.Reductions in internal noise due to panel flexibility have been measured experimentally by the German Consortium of Automobile Manufacturers. Methods for predicting this acoustical impedance due to the structure range from one-way coupling between the flow source excitation and stochastic models of the structural response, to two-way coupling between both the fluid and structural systems. We demonstrate here the use of the Finite Volume method to solve the fully coupled fluid-structure interaction, and thereby directly predict reductions in sunroof buffeting noise due to aero-vibroacoustic interaction with flexible panels. In this paper, we also take the first steps towards analysing the separation between convective and acoustical mechanisms, important for a deeper understanding of how the flow excites the structure. We use spatial Fourier analysis to illustrate the differing wave numbers associated with the flow and acoustics, arising from the single vortex shedding source in two dimensional compressible flow over a cylinder. NomenclaturedB = deciBel, measure of the intensity of Sound Pressure Level SPL = Sound Pressure Level SEA = Statistical Energy Analysis FEM = Finite Element Method BEM = Boundary Element Method FV = Finite Volume method u = Solid displacement field vector v = Velocity field vector s = Solid stress tensor field e = Strain field b = Body force vector T = Temperature field

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Investigations of Sunroof Buffeting in an Idealised Generic Vehicle Model - Part I: Experimental Results

Cited by 16 publications

References 9 publications

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

Wind noise from A-pillar and side view mirror of a realistic generic car model, DriAver

Aero-Vibroacoustic Fully Coupled Prediction of Panel Impedance Effects in Sunroof Buffeting

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