Experimental Investigation of Aeroacoustic Cabin Noise in Unsteady Flow by Means of a New Turbulence Generating Device

Terakado, Susumu; Makihara, Takafumi; Sugiyama, Takashi; Maeda, Kazuhiro; Tadakuma, Kenji; Tsuboi, Kentaro; Iyota, Masashi; Kosaka, Kazuyoshi; Sugiyama, Sadato

doi:10.4271/2017-01-1545

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…At present, two methods can be used to study aerodynamic noises: experimental and numerical simulations. Experimental simulation measures the pressure fluctuation or noise value of a target area through road and wind tunnel tests or by capturing the structure of the flow field and analyzing the relationship between flow and aerodynamic noise [5,6]. Donald P. Iacovoni et al of Ford Motor Company [7] conducted experiments to optimize the use of cars' rearview mirrors in reducing aerodynamic noise.…”

Section: Introductionmentioning

confidence: 99%

Calculation of External Vehicle Aerodynamic Noise Based on LES Subgrid Model

Guo

Wang

et al. 2020

Energies

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A dynamic Smagorinsky–Lilly model (DSLM) subgrid model on the basis of the Smagorinsky–Lilly subgrid model (SLM) was introduced in the OpenFOAM software. The flow field of the vehicle was simulated, and the pressure coefficient and sound pressure curve of the monitoring points were compared with the wind tunnel test results. The results show that the DSLM subgrid model with a wall function can achieve high simulation accuracy. The investigation of the flow field structure revealed an intermittent detachment of the turbulent vortex after the airflow passed through the rearview mirror, thereby resulting in a violent pressure pulsation on the side window around the rearview mirror. Airflow passed through the A-pillar, separated, and reattached on the upper side window, thereby producing aerodynamic noise. The research results can serve as a good reference for the simulation and test of aerodynamic noises outside the vehicle, and for the reduction of the aerodynamic noises of vehicles.

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Section: Introductionmentioning

confidence: 99%

Calculation of External Vehicle Aerodynamic Noise Based on LES Subgrid Model

Guo

Wang

et al. 2020

Energies

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Evaluation of an Unsteady Yaw, Gust, and Broadband Turbulence Generation System for Closed-Loop Automotive Wind Tunnels

Cacho,

Marques,

Van Every

et al. 2024

SAE Int. J. Passeng. Veh. Syst.

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<div>This study investigates the flow characteristics in the test section of a model-scale, three-quarters open-jet, closed-loop return wind tunnel equipped with a novel device featuring three subsystems to generate transient yaw, gusts, and turbulence. The effect of each subsystem on the resulting turbulent and unsteady flows is evaluated individually and simultaneously. It is demonstrated that this new turbulence generation system can generate yaw distributions with standard deviations ranging from 2.1° to 8.0°. This replicates a wide range of on-road yaw behavior. Additionally, the subsystems can activate transient yaw events and unsteady gusts. Frequency sweeping was demonstrated to fill a wide range of low-frequency spectra, which helps recreate the on-road flow spectra in wind tunnels. Unsteady gusts of more than 15% of the mean flow velocity were achieved. The active turbulence subsystem generates turbulence levels from a few percent, passively, to over 20% intensity levels actively, with tailorable levels depending on input parameters to the active grid. Combined, the subsystems were demonstrated to achieve a wide range of yaw distributions with different standard deviations and features of the on-road turbulence spectrum, from low-frequency events to broadband turbulence with significant inertial subrange within the model-scale wind tunnel.</div>

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