The effect of the folding rear-seat aperture in the acoustic response of a sedan car

Oktav, Akın; Anlaş, Günay; Yılmaz, Çetin

doi:10.1177/0954407016656290

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…Regarding the general framework of vibro-acoustic studies, it is known that in It is assumed that the eigenfrequencies of the actual cavity can be calculated approximately using its simplified geometry. It is shown that this assumption holds in the low frequency bandwidth, namely below 250 Hz (Xu et al, 2014;Oktav et al, 2016).…”

Section: Simplified Geometrymentioning

confidence: 97%

The Effects of Trunk Cavity and Air-Gaps in the Acoustic Response of a Passenger Vehicle

Oktav¹

2017

Archives of Acoustics

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The effects of additional cavities and air-gaps in the acoustic response of a passenger vehicle are investigated. It is observed that the cabin cavity and the trunk cavity of the passenger vehicle are connected through an aperture in the rear seat. In the trunk cavity of the vehicle, there are two more air-gaps which are designed as countermeasures to trunk lid slam noise. It is established that acoustic modes and acoustic eigenfrequencies of the vehicle are altered through the trunk cavity and its air-gaps. To develop an analytical solution, the actual acoustic cavity is simplified into a rectangular shape. In the analytical solution, the coupling of trunk and cabin cavities is considered. It is shown that the computational analysis results match well with the results of the analytical solution proposed. Further, the resonator effect of air-gaps present in the trunk cavity is examined.

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Section: Simplified Geometrymentioning

confidence: 97%

The Effects of Trunk Cavity and Air-Gaps in the Acoustic Response of a Passenger Vehicle

Oktav¹

2017

Archives of Acoustics

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“…He suggested creating a slit between the boot and the passenger cabin. A few other researchers have also studied the installation of Helmholtz resonators to minimize cabin noise in automobiles [32][33][34][35][36]. Apart from automobile cabins, the Helmholtz resonator has also been used to minimize aircraft cabin noises.…”

Section: Helmholtz Resonatormentioning

confidence: 99%

Metamaterials for Acoustic Noise Filtering and Energy Harvesting

Mir

Mandal

Banerjee

2023

Sensors

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Artificial methods for noise filtering are required for the twenty-first century’s Factory vision 4.0. From various perspectives of physics, noise filtering capabilities could be addressed in multiple ways. In this article, the physics of noise control is first dissected into active and passive control mechanisms and then further different physics are categorized to visualize their respective physics, mechanism, and target of their respective applications. Beyond traditional passive approaches, the comparatively modern concept for sound isolation and acoustic noise filtering is based on artificial metamaterials. These new materials demonstrate unique interaction with acoustic wave propagation exploiting different physics, which is emphasized in this article. A few multi-functional metamaterials were reported to harvest energy while filtering the ambient noise simultaneously. It was found to be extremely useful for next-generation noise applications where simultaneously, green energy could be generated from the energy which is otherwise lost. In this article, both these concepts are brought under one umbrella to evaluate the applicability of the respective methods. An attempt has been made to create groundbreaking transformative and collaborative possibilities. Controlling of acoustic sources and active damping mechanisms are reported under an active mechanism. Whereas Helmholtz resonator, sound absorbing, spring-mass damping, and vibration absorbing approaches together with metamaterial approaches are reported under a passive mechanism. The possible application of metamaterials with ventilation while performing noise filtering is reported to be implemented for future Smart Cities.

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“…Much of this work has been focused on vehicle body. e internal sound field in the enclosed cavity is shown to be significantly affected by the acoustic characteristics of the cavity, the structural vibration of the compartment wall panels and the coupling of these two dynamic systems [8][9][10][11][12][13][14][15][16][17]. Since the amount of absorptive material required to control lowfrequency noise can be prohibitively large, the most practical solution to the problem would seem to be modification of the vehicle structure.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Study and Reduction of Minivan Interior Booming Noise during Acceleration

Ding

et al. 2019

Shock and Vibration

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Interior booming noise during acceleration has been one of the most significant NVH problems for minivans. However, the generation mechanism of the interior booming noise remains unclear, so the access to reduce the booming noise is blocked. To solve the booming noise problem, a Source-Path-Receiver-Model-based approach is established to study the generation mechanism of the booming noise. Based on the generation mechanism, several modifications are proposed to reduce the minivan booming noise. In the established approach, the transfer path of the booming noise energy is figured out by the vehicle body and cavity experimental TPA, rear suspension dynamic analysis, and drivetrain torsional vibration analysis. Meanwhile, the vibroacoustic energy in the transfer processes is analyzed quantitatively. e identified generation mechanism is validated by the comparison of the test results of minivan interior noise and the simulation results from the established approach. During the minivan acceleration, the 5 th torsional vibration mode (50.5 Hz) of the driveline is excited by the engine torsional vibration around 1500 r/min. en, the driveline torsional resonance energy is transferred to the body and cavity through the rear suspension and finally leads to the interior booming noise. Based on the validated mechanism, several modifications are proposed to reduce the frequency response function of the driveline, the rear suspension, and the vehicle body around 50 Hz. With these modifications applied to the minivan, it is shown in the experimental results that the interior booming noise is reduced around 1500 r/min engine speed during acceleration. e mechanism study provides effective assistance with minivan interior booming noise reduction and the study approach also could be extended to explore the mechanism of other complex interior noise problems in automobiles.

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The effect of the folding rear-seat aperture in the acoustic response of a sedan car

Cited by 8 publications

References 32 publications

The Effects of Trunk Cavity and Air-Gaps in the Acoustic Response of a Passenger Vehicle

The Effects of Trunk Cavity and Air-Gaps in the Acoustic Response of a Passenger Vehicle

Metamaterials for Acoustic Noise Filtering and Energy Harvesting

Mechanism Study and Reduction of Minivan Interior Booming Noise during Acceleration

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