Transmission of Vibroacoustic Energy Through the Structures of a Car Body Into the Protected Area and its Control
Invited paper
Slovak University of Technology
Monday 1 june, 2015, 15:00 - 15:20
Auditorium 2 (592)
Abstract:
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 passenger’s 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 passenger’s cabin.