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Acoustical identification of passenger cabin of vehicles

Sayyaadi, H ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. Publisher: WITPress , 2003
  3. Abstract:
  4. Sound in the interior cabin of cars has been of the great importance nowadays. The automotive industry has long been fiercely competitive with different vendors attempting to produce vehicles with better performance, handling and fuel efficiency. The competition of the automotive industries today is directed on the reduction of noise in the cars cabin. This paper proposes a new method for noise studies in the cabin, which frequencies of excitation are lower than 200 Hz. The topics, which are covered in the paper, include the computation of the structural and acoustic mode shapes, resonant frequencies of the passenger compartment, coupling between structure and acoustic effects, and forced vibration analysis. In this research work noises, generated by cabin's panels, will be identified and then those, which are main sources of noise generators will be distinguished. The acoustical system of passenger cars cavity and vibration properties of panels and coupling between panels and air are under consideration here. A finite element method is proposed here to make a perfect model for the car cavity and then analyze compartments particularly. Panels, seats, glasses, trims, and the interior air are modeled considering various type of material for each one. Noise generator is considered here to be a loudspeaker located at the front right hand side of the car cabin. Changing frequencies of the speaker in a reasonable range making resultant pressure distributions at the driver ears position. The main goal of the article is analyzing of the acoustical system of car using proposed FEM and identification of the system. Using the proper identification method, transfer function of acoustical system at low frequencies can be concluded. This transfer function is of very high importance for noise control in vehicles. © 2003 WIT Press
  5. Keywords:
  6. Acoustic resonators ; Sensitivity analysis ; Passenger cars ; Parameter estimation ; Natural frequencies ; Mathematical models ; Machine design ; Finite element method ; Degrees of freedom (mechanics) ; Acoustic variables control ; Damping
  7. Source: WIT Transactions on the Built Environment ; Volume 69 , 2003 , Pages 339-348 ; 17433509 (ISSN)
  8. URL: https://www.witpress.com/elibrary/wit-transactions-on-the-built-environment/69/1837