Decoupled Engine for Exterior-Noise Reduction an a Lower-Mid-Class Front-Wheel-Drive Passenger Car 870633
The decoupling, i. e the elastic support of the engine block in an external housing (skeleton engine), was applied to a watercooled 1.5 1 4-cylinder gasoline production engine. Rubber elements used for the elastic support caused low frequency vibration problems. The rigid mounting of the supporting brackets in the external housing, however, ensured the necessary stiffness without incurring significant losses in noise reduction. The noise above 500 Hz was considerably reduced to the expense of some increase in low frequency noise. The noise emissions of the skeleton engine are similar to those achieved by total engine enclosures which were developed in earlier projects.
Citation: Oberg, H., Pundt, D., and Fachbach, H., "Decoupled Engine for Exterior-Noise Reduction an a Lower-Mid-Class Front-Wheel-Drive Passenger Car," SAE Technical Paper 870633, 1987, https://doi.org/10.4271/870633. Download Citation
H.-J. Oberg, D. Pundt, H. A. Fachbach
Volkswagen AG Wolfsburg, West Germany, AVL Gesellschaft für Verbrennungskraftmaschinen mbH Graz. Austria
SAE International Congress and Exposition
SAE 1987 Transactions-V96-87, Proceedings of the 1987 Noise and Vibration Conference-P-195