Wind noise source filtering and transmission study through a side glass of DrivAer model

He, Yikang; Schröder, Simon; Shi, Zihao; Blumrich, Reinhard; Yang, Zhigang; Wiedemann, Jochen

doi:10.1016/j.apacoust.2019.107161

Cited by 19 publications

(13 citation statements)

References 13 publications

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“…There are three sub-turbulence models of the near-wall RANS model, namely the Spalart-Allmaras model, the k-ε model, and the SST k-ω model. According to the previous study, 12 for the incompressible DES calculation of the DrivAer model, the SST k-ω model was the most applicable one. Hence, it was applied in this study.…”

Section: Flow Field Simulation and Wind Tunnel Experimentsmentioning

confidence: 99%

“…Yao et al 11 also studied the flow field behind a rearview mirror with compressible large eddy simulation (LES), then separated these two parts on the rectangular glass surface behind the mirror. He et al 12 once used a compressible Spalart-Allmaras DES model combined with an improved wavenumber decomposition algorithm to separate the convective and acoustic pressure fluctuations on the side glass with irregular shape of a DrivAer model successfully. With respect to the pellicular mode decomposition, Ganty et al 13 once used this approach to separate the convective and acoustic components on the side window surface of a Simplified Hyundai Model.…”

Section: Introductionmentioning

confidence: 99%

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Wind noise source characterization and transmission study through a side glass of DrivAer model based on a hybrid DES/APE method

Wen

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Based on a DrivAer model with notchback, the characteristics of convective and acoustic pressure fluctuations on the side window, as well as their contributions to interior noise were studied. Firstly, a full-size DrivAer clay model was produced with a real glass set on the front left window, and the rest parts with thick clay. In this way, the side glass becomes the exclusive transmission path for the exterior convective and acoustic pressures into acoustic cabin inside. In this study, the acoustic pressure fluctuation on the side window surface was calculated by solving the acoustic perturbation equation (APE) based on the calculation results of convective pressure fluctuation with the incompressible Detached Eddy Simulation (DES). Furthermore, with the convective and acoustic pressure fluctuations as power inputs, the interior noise was calculated with Statistical Energy Analysis (SEA). The calculated interior noise level shows good agreement with the tested results in the wind tunnel, which indirectly validates the reliability of the calculated acoustic pressures with APE method. The contributions of the convective and acoustic pressure fluctuations to the interior noise show that the acoustic pressure fluctuation takes much higher transmission efficiency than the convective one, especially at the high frequency range above the coincidence frequency of the glass, the contribution of acoustic pressure fluctuation is absolutely dominant.

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Section: Flow Field Simulation and Wind Tunnel Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wind noise source characterization and transmission study through a side glass of DrivAer model based on a hybrid DES/APE method

Wen

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

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“…In another study, a clay model of a vehicle was tested in the wind tunnel. The results show that the main source of transmitted interior noise is related to the mirror [14]. The Lighthill theory was used to make a numerical model to investigate the effect of the mirror and A-pillar on noise generation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Optimization of the Aerodynamic Noise Reduction of Vehicle Side View Mirrors: Experimental and Numerical Study

Gohari

Norozi

Aghdam

2022

HighTech. Innov. J.

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Automobile passengers are usually sensitive to the noises generated by the engine and vehicle body. One of the noise sources is the generated turbulent flow around the Vehicle Side View Mirror (VSVM) and around the A-pillar, producing fluctuating pressure. Unwanted noise is a result of fluctuating pressure around the car's body. Modification of the geometry of the vehicle body may affect the generated noise by turbulent flow. In this paper, the original side view mirror of a small sedan car named Tiba was aimed at geometry modification to decrease airborne noise. The mirror was assessed by CFD simulation and an outdoor test. Road tests were applied at three forward speeds (80, 100, and 120 km/h) to measure the sound level generated by the vehicle's side mirrors. Then, the geometry of VSVM was modified to diminish the sound pressure level of that based on decreasing turbulent flow and fluctuating pressure around the side mirror. Finally, the achieved geometry was evaluated using road tests, which showed a noise reduction of 8 to 12%. Road tests were done for the modified side car mirror. It shows that a modified mirror can reduce the sound level of airborne noise. By using this suggested modified side view mirror, the risk of annoying noise may be diminished and passenger comfort ability can be increased through driving. Doi: 10.28991/HIJ-2022-03-01-08 Full Text: PDF

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“…These studies focused on benchmarking different numerical methods without a detailed analysis of related physical and numerical issues. He et al [8] combined the Spalart-Allmaras detached eddy simulation (DES) method with a statistical energy analysis (SEA) model to investigate the relative contribution of the convective and acoustic pressure fluctuations around a car side window to the interior of a full-sized DrivAer clay model. They revealed that the contribution of the acoustic fraction was more dominant than the convective one.…”

Section: Introductionmentioning

confidence: 99%

Development of High-Fidelity Numerical Methodology for Prediction of Vehicle Interior Noise Due to External Flow Disturbances Using LES and Vibroacoustic Techniques

Lee

Cheong

2022

Applied Sciences

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A pleasant and quiet cabin in driving a car is one of the most critical factors affecting a customer’s choice in a market. As the traditional noise sources such as power trains become less, the relative contribution of aerodynamic noise to the interior noise of a road vehicle becomes even more critical. In this study, a high-fidelity numerical methodology is developed for the reliable prediction and analysis of the interior transmitted noise due to external flow disturbance. The developed numerical methodology is based on the sequential application of the high-resolution LES technique, wavenumber–frequency transform, and vibroacoustic model. First, the compressible LES techniques with high-resolution grids are employed to accurately predict the external turbulent flow and aeroacoustic fields due to the turbulent flow, at the same time, of a vehicle running at a speed of 110 km/h. Second, surface pressure fluctuations on the front windshield and side windows, obtained from the LES simulation, are decomposed into incompressible and compressible ones using the wavenumber–frequency transform. Lastly, the interior sound pressure levels are predicted using the vibroacoustic model, which consists of the finite element (FE) and statistical energy analysis (SEA) methods. For the efficient computation of the vibroacoustic interaction between the vibration of the vehicle windows and the acoustic field inside the cabin room, the FE and SEA methods are applied in low- and high-frequency ranges, respectively. The predicted interior sound pressure spectral levels agree well with the measured ones. In addition, although the magnitudes of the compressible pressure components are generally lower than those of the incompressible ones, the compressible field is found to contribute more to the interior noise in high-frequency bands. The physical mechanism of the higher transmission is shown to be related to the coincident effect between the compressible pressure field and the structural vibration of the vehicle window.

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Wind noise source filtering and transmission study through a side glass of DrivAer model

Cited by 19 publications

References 13 publications

Wind noise source characterization and transmission study through a side glass of DrivAer model based on a hybrid DES/APE method

Wind noise source characterization and transmission study through a side glass of DrivAer model based on a hybrid DES/APE method

Evaluation and Optimization of the Aerodynamic Noise Reduction of Vehicle Side View Mirrors: Experimental and Numerical Study

Development of High-Fidelity Numerical Methodology for Prediction of Vehicle Interior Noise Due to External Flow Disturbances Using LES and Vibroacoustic Techniques

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