Engine’s vibration propagating through its suspension is often responsible for the low frequency noise perceived by vehicle occupants. In the design process and at early stage of development, it is useful to have an efficient way of estimating the properties of an engine suspension since these properties directly dictate the engine structureborne vibration contribution to total noise of a vehicle. These properties include stiffness, position, orientation and number of engine mounts. A good design will provide adequate support of the engine as well as low power transmitted to the structure in order to reduce as much as possible the transmitted structureborne vibration and the radiated acoustic energy. The purpose of this paper is to present an efficient and straightforward approach to develop and optimize engine suspension. Various objective functions such as transmitted forces, power flow injected in the elastic base structure, vibration levels taken at critical locations and driver ears acoustics pressure levels can be used. Using Matla TM, a dedicated and user-friendly software has been developed to assist and guide suspension designers. It allows the user to model each of the different parts of the system either as rigid or as flexible structures.
2000 – IMAC 2000 Austin, Texas, USA
Denis Blanchet (University of Sherbrooke, Canada)
Yvan Champoux (University of Sherbrooke, Canada)