Vibro-Acoustic Simulation of Side Windows and Windshield Excited by Realistic CFD Turbulent Flows Including Car Cavity

Herpe, François van; d'Udekem, Diego; Jacqmot, Jonathan; Kouzaiha, Rami

doi:10.4271/2012-01-1521

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…Many authors investigated the separation of aerodynamic wall-pressure fluctuations and acoustic pressure fluctuations on the side window and their influence on the interior sound level [8]. The experimental approaches rely for example on wavenumber filtering on the surface, as done by Arguillat et al [1] and Van Herpe et al [9]. In recent years, many numerical investigations of the problem were conducted, using different methods for sound calculation.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

Nusser

Becker

2021

Acta Acust.

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“…In these two studies, the frequency range reported was 250-5000 Hz in third octave bands and both also showed proper design prediction with alternate side mirrors. Another recent model of vehicle wind noise transmission has been reported using deterministic finite element representations of the structural acoustics behavior of multiple glass panels and the enclosed cabin by Van Herpe et al [3], also using CFD to obtain transient exterior pressure loadings. Results up to the 1600 Hz third octave band frequency were reported in [3].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Underbody Contribution of Wind Noise in a Passenger Automobile

Powell¹,

Moron²,

Balasubramanian³

et al. 2013

SAE Int. J. Passeng. Cars - Mech. Syst.

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Wind noise is a significant source of interior noise in automobiles at cruising conditions, potentially creating dissatisfaction with vehicle quality. While wind noise contributions at higher frequencies usually originate with transmission through greenhouse panels and sealing, the contribution coming from the underbody area often dominates the interior noise spectrum at lower frequencies. Continued pressure to reduce fuel consumption in new designs is causing more emphasis on aerodynamic performance, to reduce drag by careful management of underbody airflow at cruise. Simulation of this airflow by Computational Fluid Dynamics (CFD) tools allows early optimization of underbody shapes before expensive hardware prototypes are feasible. By combining unsteady CFD-predicted loads on the underbody panels with a structural acoustic model of the vehicle, underbody wind noise transmission could be considered in the early design phases. This paper describes a numerical process capable of simulating underbody contributions to interior wind noise. A CFD model based on the Lattice Boltzmann Method is applied to generate fluctuating pressure loads on the underbody. Structural and acoustic loads are then calculated and applied to a vehicle noise model based on Statistical Energy Analysis, with certain parameter updates from a finite element model to predict accurately the noise transmission through the underbody panels to the driver's ear location. Interior noise validation has been achieved on a series production sedan in an aeroacoustic wind tunnel, making use of acoustic insulation materials to block greenhouse transmission. Variation in flow speed and microphone location is included to verify prediction capability of this completely numerical process.

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“…Therefore, the vehicle doors tend to open because of the effect of the decrease in the external pressure. 4–6 Moreover, if the sound passes through a seal system and enters the cabin, the interior sound level significantly increases. 7–9…”

Section: Introductionmentioning

confidence: 99%

Sound transmission modeling and numerical analysis for automotive seal considering non-uniform compression

Zhu

Zhong

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Automotive metal door panels and nonmetallic seals have complicated nonlinear interactions in their narrow mating sections, leading to non-uniform compression and complicating the sound transmission mechanism. Therefore, a new sound transmission modeling methodology and numerical analysis is developed for a refined sealing system by considering the geometrical boundaries and the non-uniform compression load. Nonlinear analysis is performed to obtain the geometrical parameters of the deformed seal, which are later input to the subsequent numerical acoustic model, by varying the compression ratios at different door locations under quantified nonlinear metal–seal interaction boundary conditions. A numerical prediction model of the sound transmission loss is constructed considering the deformed seal geometry using a double-wall-panel sound transmission model. Finite-element analysis and an infinite-element method are combined. Sound transmission loss experiments are conducted by varying the compression ratios of the seal. Experimental results are in good agreement with the numerical analysis. Furthermore, the sound transmission loss of the incident sound source with respect to a wide range of frequencies is numerically predicted for different compression magnitudes and directions using the verified methodology. This shows that the presented model and numerical methodology is valuable for optimizing the sound transmission loss performance of automotive door seals.

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Vibro-Acoustic Simulation of Side Windows and Windshield Excited by Realistic CFD Turbulent Flows Including Car Cavity

Cited by 7 publications

References 4 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

Simulation of Underbody Contribution of Wind Noise in a Passenger Automobile

Sound transmission modeling and numerical analysis for automotive seal considering non-uniform compression

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