Abstract
The front end structure of a vehicle containing the
regular sound package on the dash panel was investigated
after its sound radiation by exciting it with a shaker at
a position where the RHS engine mount is positioned.
The test object was investigated in the Transmission Loss
Test Laboratory of the Ford-Werke AG, Cologne-Germany.
The sound radiation of this structure in the frequency
range of 200.600 Hz upon random
excitation was investigated at delivery conditions as
well as by applying an Active Noise Control (ANC)
system consisting of innovative flat Electromechanical
Film (EMFi) panels, batches of mini-loudspeakers and
combinations of both as actuators. Prior to the active
noise control exercise, preparatory tests were conducted
on the test object to identify its vibro-acoustic
behavior and thus to provide initial data for
establishing the control strategy. Furthermore, chassis
dyno tests on a car were conducted in advance to define a
realistic excitation level for the shaker.
Four basic test configurations with a total test case
number of 12 were tested, where the actuator and sensor
distribution over the dash surface as well as the control
strategy were varied. The results indicated that the used
ANC system enables the radiated sound power being
attenuated up to 8 dB.
| Original language | English |
|---|---|
| Publication status | Published - 2000 |
| Event | International Conference on Noise and Vibration Engineering, ISMA25 - Leuven, Belgium Duration: 13 Sept 2000 → 15 Sept 2000 |
Conference
| Conference | International Conference on Noise and Vibration Engineering, ISMA25 |
|---|---|
| Abbreviated title | ISMA |
| Country/Territory | Belgium |
| City | Leuven |
| Period | 13/09/00 → 15/09/00 |