Transmission of Vibroacoustic Energy Through the Structures of a Car Body Into the Protected Area and its Control
Slovak University of Technology
Monday 1 june, 2015, 15:00 - 15:20
Auditorium 2 (592)
The main aim of the paper is to investigate the conditions for the transmission of the dynamic loading (vibration and noise) from the vibration sources, mainly combustion engine, through the structures of the car body into the protected space (cabin) of the passengerís car. The solution of this problem includes the methodology of the experiments for the given structure, using measuring equipment, measurements of vibration at the sources and on the transmission path of structural noise as well as noise measurements in the protected area. The results of the vibration and noise measurements are compared to the modal analysis to obtain the possible resonance sources of the car body and/or assessing influence of the car safety parts (reinforced doors, body roof, deck) on the generated vibroacoustic energy transfer into the protected area of the passenger car. Measurements were made for the passenger car at rest at the most frequent operational rotational speed. For the detection of the vibroacoustic energy sound pressure level (noise) and mechanical vibration were measured and FFT analysis was used. In the first place the low-frequency noise sources are specified and the direct effects on the human being are investigated. Finally, this paper suggests some measures which can have impact on the reduction of the non required vibroacoustic energy in the passengerís cabin.
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