Transmission characteristics and mechanism study of hydrodynamic and acoustic pressure through a side window of DrivAer model based on modal analytical approach

He, Yikang; Wan, Rongxin; Liu, Yongming; Wen, Siyi; Yang, Zhigang

doi:10.1016/j.jsv.2021.116058

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…S 2 , α 2 are the indoor surface area and absorption coefficient of the receiving room, respectively. In equation (9), L r and L t can be measured directly. Next to solve equation (10).…”

Section: Experiments Principlementioning

confidence: 99%

“…Therefore, researchers conducted some investigations on the acoustic analysis of composite structures. However, the main concerns were sound transmission mechanism, [7][8][9] numerical simulation method, [10][11][12][13] and composite acoustic design. [14][15][16] The influence of thermomechanical behavior on composite structures' STL is still a field of sporadic research.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of sound transmission loss characteristics of aircraft composite panel under variable temperature environment

Peng

Dong

Yan

2022

Journal of Low Frequency Noise, Vibration and Active Control

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An improved sound transmission loss (STL) experimental technique based on the sound pressure method (SPM) and acoustic box method is proposed to investigate the temperature influence on the STL of the ribbed carbon fiber reinforced plastics aircraft panel. SPM principle is given. The measurement procedure of the improved STL technique is presented and its reliability is verified. STL variable characteristics of the panel within −40°C–40°C were measured. Results showed that temperature had a significant effect on the panel’s STL. The overall STL varied nonlinearly with temperature, whereas STL exhibited a fluctuation or monotony trend at a single center frequency. Temperature variation caused changes of STL peak/dip frequencies and redistribution of stiffness-controlled, resonance-controlled, coincidence-controlled, and damping-controlled regions. The causes of the aforementioned are given. This study reveals the relationship between temperature, thermomechanical parameters and STL. The findings have applications in the design, measurement, analysis, and theoretical development of composite structure acoustics.

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“…S 2 , α 2 are the indoor surface area and absorption coefficient of the receiving room, respectively. In equation (9), L r and L t can be measured directly. Next to solve equation (10).…”

Section: Experiments Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of sound transmission loss characteristics of aircraft composite panel under variable temperature environment

Peng

Dong

Yan

2022

Journal of Low Frequency Noise, Vibration and Active Control

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“…Regardless of the chosen approach for investigating both vehicle aerodynamic performance and aeroacoustics (direct or hybrid), RANS-LES methods have gained recognition for their ability to deliver solutions with superior accuracy compared to the RANS approach [14,27,28] while remaining computationally more e cient than the full LES subjected to realistic ow conditions [9,29,30,31]. To date, various RANS-LES variants, viz., DES, DDES, IDDES, and SBES approaches coupled with near-wall modelling using SST, SA, and k-ε approaches, have been extensively applied to generic and non-generic mirror geometries [52,53,54,55], SAE-T4 and DrivAer vehicle con gurations [10,11,22,32]. RANS-LES-based numerical investigations on these geometries have not only shown excellent agreement with experiments but have also enhanced our understanding of ow physics.…”

Section: Introductionmentioning

confidence: 99%

“…RANS-LES-based numerical investigations on these geometries have not only shown excellent agreement with experiments but have also enhanced our understanding of ow physics. In particular, comparisons under different uid assumptions (compressible or incompressible) revealed insigni cant differences in all frequency bands for hydrodynamic pressure uctuations on the side window [11,22,32]. The IDDES and the SBES-based predictions on the SAE-T4 [9,11,50] body have particularly revealed several insights, including i) the A-pillar serves as the primary noise source in the absence of a side mirror, while in the presence of a side-view mirror shifting the focus to the mirror as the major noise source; ii) the turbulent pressure uctuations predominantly excite the window below 800 Hz, while acoustic pressure uctuations dominate above 800 Hz; iii) for frequencies lower than 1 kHz, hydrodynamic pressure uctuations are primarily responsible for the window excitation; and iv) the noise radiated from the vehicle can exhibit dipole-monopole transitions at several stages based on the noise source in consideration.…”

Section: Introductionmentioning

confidence: 99%

The Role of Forebody Topology on Aerodynamics and Aeroacoustics Characteristics of Squareback Vehicles using Computational Aeroacoustics (CAA)

Viswanathan,

Chode

2023

Preprint

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This study investigates the influence of forebody configuration on aerodynamic noise generation and radiation in standard squareback vehicles, employing a hybrid computational aeroacoustics approach. Initially, a widely used standard squareback body is employed to establish grid-independent solutions and validate the applied methodology against previously published experimental data. Six distinct configurations are examined, consisting of three bodies with A-pillars and three without A-pillars. Throughout these configurations, the reference area, length, and height remain consistent, while systematic alterations to the forebody are implemented. The findings reveal that changes in the forebody design exert a substantial influence on both the overall aerodynamics and aeroacoustics performance of the vehicle. Notably, bodies without A-pillars exhibit a significant reduction in downforce compared to their A-pillar counterparts. For all configurations, the flow characteristics around the side-view mirror and the side window exhibit an asymmetrical horseshoe vortex with high-intensity pressure fluctuations, primarily within the confines of this vortex and the mirror wake. Side windows on bodies with A-pillars experience more pronounced pressure fluctuations, rendering these configurations distinctly impactful in terms of radiated noise. However, despite forebody-induced variations in pressure fluctuations impacting the side window and side-view mirror, the fundamental structure of the radiated noise remains relatively consistent. The noise pattern transitions from a cardioid-like shape to a monopole-like pattern as the probing distance from the vehicle increases.

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“…However, this study was limited to the problem of simple geometry. He et al [10] studied the transmission characteristics and mechanism of the exterior wall pressure fluctuation on the side window of a full-size DrivAer model to the interior wind noise by using a simplified rectangular window-cabin equivalent model. They investigated the fundamental cause of different transmission efficiency between two pressure components.…”

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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Transmission characteristics and mechanism study of hydrodynamic and acoustic pressure through a side window of DrivAer model based on modal analytical approach

Cited by 10 publications

References 21 publications

Analysis of sound transmission loss characteristics of aircraft composite panel under variable temperature environment

Analysis of sound transmission loss characteristics of aircraft composite panel under variable temperature environment

The Role of Forebody Topology on Aerodynamics and Aeroacoustics Characteristics of Squareback Vehicles using Computational Aeroacoustics (CAA)

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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