Archives of Acoustics, 42, 3, pp. 433–440, 2017

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

Bogazici University

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.
Keywords: acoustic coupling; acoustic eigenfrequencies; acoustic modes; acoustic response; air-gap; cabin cavity; Helmholtz resonator; passenger vehicle; trunk cavity; wave number
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Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).


Ahn C.G., Choi H.G., Lee J.M. (2005), Structuralacoustic coupling analysis of two cavities connected by boundary structures and small holes, Journal of Vibration and Acoustics, 127, 6, 566–574

Alster M. (1972), Improved calculation of resonant frequencies of Helmholtz resonators, Journal of Sound and Vibration, 24, 1, 63–85.

Chintapalli V.R., Padmanabhan C. (2015), Design relations and simplified reactance formulas for multiorifice Helmholtz resonators, Acta Acustica united with Acustica, 101, 1, 124–133.

Ferreira T.S., Magalhães P.A., Moura F.L., Ferreira T.S. (2016), The Effect of the Cavity Damping on Vehicular Evaluation using the Finite Element Method, Archives of Acoustics, 41, 1, 87–97.

Huang L. (2000), A theory of reactive control of lowfrequency duct noise, Journal of Sound and Vibration, 238, 4, 575–594.

Ingard U. (1953), On the theory and design of acoustic resonators, The Journal of the Acoustical Society of America, 25, 6, 1037–1061.

Ingard U. (2010), Notes on Acoustics, Laxmi Publications Ltd.

Kang S.W., Lee J.M., Kim S.H. (2000), Structuralacoustic coupling analysis of the vehicle passenger compartment with the roof, air-gap, and trim boundary, Journal of Vibration and Acoustics, 122, 3, 196–202.

Komkin A.I., Mironov M.A., Yudin S.I. (2014), Eigenfrequency of a Helmholtz resonator at the wall of a rectangular duct, Acoustical Physics, 60, 2, 142–147.

Lee J.W., Lee J.M. (2007a), Forced vibro-acoustical analysis for a theoretical model of a passenger compartment with a trunk – Part I: Theoretical part, Journal of Sound and Vibration, 299, 4, 900–917.

Lee J.W., Lee J.M. (2007b), Forced vibro-acoustical analysis for a theoretical model of a passenger compartment with a trunk – Part II: Experimental part, Journal of Sound and Vibration, 299, 4, 918–932.

Lee S., Park K., Sung S.H., Nefske D.J. (2011), Boundary condition effect on the correlation of an acoustic finite element passenger compartment model, SAE International Journal of Materials and Manufacturing, 4, 1, 708–715.

Li D., Cheng L. (2007), Acoustically coupled model of an enclosure and a Helmholtz resonator array, Journal of Sound and Vibration, 305, 1, 272–288.

Marburg S., Nolte B. (2008), Computational Acoustics of Noise Propagation in Fluids: Finite and Boundary Element Methods, vol. 578, Berlin, Heidelberg: Springer.

Nair S.U., Shete C.D., Subramoniam A., Handoo K.L., Padmanabhan C. (2010), Experimental and computational investigation of coupled resonator– cavity systems, Applied Acoustics, 71, 1, 61–67.

Oktav A., Anlas¸ G., Yılmaz Ç. (2016), The effect of the folding rear-seat aperture in the acoustic response of a sedan car, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 231, 2, 253–266.

Panton R.L., Miller J.M. (1975), Resonant frequencies of cylindrical Helmholtz resonators, The Journal of the Acoustical Society of America, 57, 6, 1533–1535.

Pietrzyk A., Bengtsson T. (2007), An investigation of the coupling between the passenger compartment and the trunk in a sedan, SAE Technical Paper, No. 2007- 01-2356.

Seifzadeh A., Pietrzyk A., Göransson P., Ramakrishnan R. (2014), Effect of coupling between passenger compartment and trunk of a car on coupled system natural frequencies using acoustic frequency response function, Applied Acoustics, 76, 310–318.

Selamet A., Radavich P.M. (1997), The effect of length on the acoustic attenuation performance of concentric expansion chambers: an analytical, computational and experimental investigation, Journal of Sound and Vibration, 201, 4, 407–426.

Shin S.H., Hashimoto T. (2013), Optimum order spectrum profiles for improvement of sound quality of car interior noise, Noise Control Engineering Journal, 61, 6, 578–589.

Vorländer M. (2014), Virtual acoustics, Archives of Acoustics, 39, 3, 307–318.

Xu H., Dickinson O., Wang J., Kang H. (2014), Acoustic cavity modal analysis for NVH development of road machinery cabins, Topics in Modal Analysis II, 8, Springer International Publishing.

Yu X., Cheng L., Guyader J.L. (2014), Modeling vibroacoustic systems involving cascade open cavities and micro-perforated panels, The Journal of the Acoustical Society of America, 136, 2, 659–670.

Žiaran S., Chlebo O. (2016), Noise control transmission methods of the combustion engine by means of reduction of the vibration, Archives of Acoustics, 41, 2, 277–284.

DOI: 10.1515/aoa-2017-0045