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.
|Publication status||Published - 2000|
|Event||International Conference on Noise and Vibration Engineering, ISMA25 - Leuven, Belgium|
Duration: 13 Sep 2000 → 15 Sep 2000
|Conference||International Conference on Noise and Vibration Engineering, ISMA25|
|Period||13/09/00 → 15/09/00|