Wind Noise Source Characterization and How It Can Be Used To Predict Vehicle Interior Noise

Blanchet, Denis; Golota, Anton; Zerbib, Nicolas; Mebarek, L.

doi:10.4271/2014-01-2052

Cited by 14 publications

(7 citation statements)

References 15 publications

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“…To study the transmission efficiency of two kinds of pressure fluctuations from exterior sources to vehicle interior, a normalized model with a constant amplitude to stand for the exterior convective or acoustic pressure fluctuations on the side glass was adopted as excitation source, then with the same SEA model as above, using Corcos and PWF model individually as power input to predict the interior noise level. 22 As shown in Figure 14, although the exterior loads are in the same level, the induced interior noise level due to the convective pressure is much lower than that due to the acoustic pressure. That means, the transmission efficiency of acoustic pressure is much higher than that of the convective one.…”

Section: Interior Noise Calculation Of Drivaer Modelmentioning

confidence: 90%

“…For the power input, the convective pressure fluctuation can be represented with Corcos model, 5,22 which as an empirical approach is widely used to characterize hydrodynamic source of incoming flow; while the acoustic pressure fluctuation can be represented with Propagating Wave Field (PWF) model, which is suitable for the acoustic waves traveling with a specific direction from sound source to the destination. 22 The statistical parameters of each subsystem of the SEA model can be obtained through experiments or with empirical formulas, such as modal density and damping loss factors.…”

Section: Interior Noise Calculation Of Drivaer Modelmentioning

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: Interior Noise Calculation Of Drivaer Modelmentioning

confidence: 90%

Section: Interior Noise Calculation Of Drivaer Modelmentioning

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:

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show abstract

“…According to the physical parameters and Equation (15), the wavenumber curve of the panel with frequency can be calculated, and the wavenumber of the convective and acoustic components can also be calculated according to Equation (16). The results are shown in Figure 15.…”

Section: Acoustic Component Of Fspmentioning

confidence: 99%

“…So, how to predict vehicle interior noise accurately based on the CFD incompressible flow data is a concern. Blanchet et al [16] proposed several models to predict cabin interior noise based on the CFD compressible, incompressible simulation and experiment results, but no comparison between different models was acquired. Therefore, this paper focuses on finding out a proper method to predict the radiated noise of a panel under the fluctuating surface pressure (FSP) due to an idealized side mirror.…”

mentioning

confidence: 99%

Study on Radiated Noise of a Panel under Fluctuating Surface Pressure Due to an Idealized Side Mirror

et al. 2020

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As traditional automobiles develop towards new energy vehicles, the noise, vibration and harshness (NVH) performance of automobiles is facing new challenges. Without the cover of the traditional engine noise and inlet and exhaust noise, the high-speed wind noise becomes more prominent. Thus, research on the calculation method of vehicle interior noise in high-speed driving condition is needed. However, vehicle body structure is complex, and the external excitation components are complicated. In order to analyze the method of predicting the vehicle interior noise at high speed, an idealized side mirror model is taken as the research object in this paper and the radiated noise of a panel under the fluctuating surface pressure (FSP) due to the idealized side mirror is studied. The FSP of the panel is first studied by the numerical simulations of incompressible and compressible flow field. For the incompressible flow field, the Corcos turbulent boundary layer (TBL) model is established to simulate the convective component and the boundary element method (BEM) is used to extract the acoustic component. Subsequently, the Corcos model coupling BEM method, the random modal force coupling BEM method and the deterministic modal force coupling BEM method are used separately to calculate the noise of the panel under the FSP. For the compressible flow field, the convective and acoustic component in the fluctuating pressure are separated by the wavenumber-frequency spectrum (WFS) method. The radiated noise of the panel under the FSP is calculated again by using the WFS, the method of random modal force and the method of deterministic modal force, respectively. Then, the computational time of the six methods of incompressible and compressible calculation is compared. Finally, a fast and accurate method of calculating the panel radiated noise under FSP is obtained by comparing the computational accuracy with the experimental results and combining the computational time: the method of incompressible random modal force. This method can be used to quickly and accurately analyze the vehicle interior noise at high speed, and to optimize the exterior protrusions and the vehicle sound package for improving the vehicle NVH performance at high speed.Appl. Sci. 2020, 10, 994 2 of 22 component of the outflow field in [2][3][4]. In order to analyze the effect of the acoustic component on the interior noise SPL of the vehicle, the characteristics of the acoustic component were studied. The researches show: both the convective and acoustic component are equally important contributors for the noise transmission to the vehicle cabin although the TBL pressure is 25 to 35 dB higher in level than that of the corresponding acoustic component [1].There are many kinds methods for calculating the response under the TBL excitation. One of the models for the TBL is presented by Corcos [5]. Then, Chase and Efimstov built models derived from Corcos expression, which can improve the predictions for the low-frequency range [4,6]. Birgersson et al. [7] used ...

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“…An accurate excitation field was calculated with a hybrid computational aeroacoustics (CAA) approach based on an incompressible unsteady flow field with an acoustic wave equation. From 2014 to 2016, Blanchet et al [4,5] studied the characteristics of pressure fluctuations on the side glass. At first, Corcos model was used to characterize the convective part, and propagating wavefield was used to characterize the acoustic part.…”

Section: Introductionmentioning

confidence: 99%

Sound Radiation Analysis of a Front Side Window Glass of DrivAer Model under Wind Excitation

Shi

et al. 2018

Shock and Vibration

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To study the car radiated noise caused by turbulent pressure fluctuation on the side glass under wind excitation, a clay model of DrivAer was constructed except that the front left side window was built with real glass. Firstly, the constraint boundary condition of the side glass was set equivalent to a series of springs for the modelling with Finite Element Method (FEM). Then, a platform based on Matlab-Abaqus cosimulation was originally developed, and the genetic algorithm was applied to find out the best fitted spring stiffness, which was used to build the equivalent model. Then working as excitation, the Corcos model was applied to calculate the power spectrum density of the turbulence pressure fluctuations acting on the side glass. Subsequently, the finite element modal superposition method was used to solve the vibroacoustic coupling equation to get the noise level of the driver’s ear position in the vehicle interior. Finally, the surface vibration velocity distribution of side glass under wind excitation was measured with Laser Vibrometer and then with Boundary Element Method (BEM), the radiated noise into interior was calculated as well (semisimulation). Through comparison of these two results, it shows good agreement up to 1000 Hz. It demonstrates that the above method is applicable to calculate the sound radiation caused by the side glass’ vibration at the low and middle frequency range. Therefore, an approach of calculating sound radiation of a vibrating glass caused by the air convective pressure fluctuation was explored.

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Wind Noise Source Characterization and How It Can Be Used To Predict Vehicle Interior Noise

Cited by 14 publications

References 15 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

Study on Radiated Noise of a Panel under Fluctuating Surface Pressure Due to an Idealized Side Mirror

Sound Radiation Analysis of a Front Side Window Glass of DrivAer Model under Wind Excitation

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