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| Depending on the vehicle
and operating conditions (e.g. waiting at a traffic light),
the vehicle interior noise resulting from a windshield
wiper system may be regarded as annoying or disturbing. |
| Since identical windshield
wiper systems create completely different vehicle interior
sounds de- pending on the vehicle that they are implemented
in, the disturbing noise patterns are not only related
to the source but also to the vehicle body. |
| Thus it is obvious that
both sides (source and structure) are contributing to
the resulting interior sound. In particular, the stiffnesses
of the system attachment points are extremely important
with respect to the resulting noise. |
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Comparison of
the simulated and the measured vehicle interior noise
- sound source wiper
Click here for a detailed view |
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The methodology of  BTPA/BTPS offers a close look at the interaction of sound source and transmission
behavior and is therefore ideally suited for understanding the
origin of a disturbing noise pattern and finding a suitable
solution. |
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| The BTPA result on the left
already shows the problem of this vehicle: |
| The disturbing noise is
transferred mainly via the right attachment point even
though the source system is symmetrical. |
| The problem is resulting
from an impedance mismatch of silent block and body attachment. |
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Vehicle interior
noise contributions resulting from the 3 attachment points
of the system
Click here for a detailed view |
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Further Sound Sources, Accessories
