Reduction of interior noise in an automobile passenger compartment by means of active structural acoustic control (ASAC)

Abstract

This research work deals with the reduction of windshield-vibration-induced interior noise in an automobile passenger compartment by means of active structural acoustic control (ASAC). The investigations are based on former work conducted within the framework of the EU-IP InMAR and make use of an existing test-car equipped with an active windshield. The active windshield consists of the passive structure augmented with optimally placed piezo-ceramic transducers. Main focus of the subsequent work was the development and evaluation of different control strategies (H2, FxLMS) designed with regard to either local or global performance metrics. Due to the lack of a roller test bench, the structural excitation was realized by an electrodynamic exciter (shaker) lo-cated at the roof brace between the A-pillars. By this choice it was possible to emulate the struc-tural excitation of the windshield due to rolling and motor force harmonics. In order to achieve a fully structurally integrated sensing and actuation of the windshield vibration the exclusive use of optimally placed piezoelectric transducers was intended. Though, in the experiments, sensing was performed by means of acceleration sensors facilitating a calibration of structural sensor- and Scanning Laser Doppler Vibrometer (SLDV) data.