This paper describes a modeling procedure for ASAC, which allows the use of standard vibro-acoustic FE models in the control design. The modeling procedure is experimentally validated with a vehicle mock-up. The proposed experimental setup is acoustically excited by a SQ-equivalent engine simulator, typically employed in auralization. The use of such scheme allows repeatable measurements with engine-like excitation signals, furnishing results that can be directly correlated to automotive applications. The results for Loudness attenuation are presented in terms of Specific and Zwicker Loudness, the latter being linearly related to the human sensation of volume. The results indicate that the controller is quite effective with respect to the occupants perception of the sound field. Also, it was possible to control an order independently from the others, which is an interesting feature for the intended future application of such controllers, i.e., order balancing. In order to independently tune multiple orders, similar controllers could be connected in parallel since each narrowband action would not interfere with each other. The improved convergence speed of the presented adaptive feedforward control indicates it could cope with varying engine speed. A next step in this study is to investigate the effect of such a controller in the whole cavity and extend the SQ investigation to Roughness. The only way to improve Roughness is through order balancing, which this scheme is capable of. The desired order profiles (amplitude and phase vs. RPM) can be defined with the aid of SQ-equivalent models and further used to define target values for the feedforward controller.
Adaptive control schemes for engine sound quality improvement
2008
11 Seiten, 13 Bilder, 2 Tabellen, 12 Quellen
Conference paper
Storage medium
English
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