Technical Paper
Experimental and Numerical Modal Analysis of a Blower Motor Support
1997-02-24
971129
About ten years ago the major noise and vibration sources in a vehicle were the engine and the aero dynamic noise sources. During these last years the noise and vibration levels induced in the vehicle by these two sources have decreased in very high proportions. The consequence of that is that former secondary noise sources like the air-conditioning system have now become major noise and vibration sources. One of the most important noise and vibration sources in the air-conditioning unit is the blower. This component is composed of an electric motor, a fan wheel and a motor support in which the electric motor is fixed. This work only deals with the vibrations generated which are due either to the wheel unbalance or due to electric motor vibrations. The unbalance can generate vibration discomfort on the steering wheel and the electric motor vibrations are very often solid borne noises generated especially for low speeds of operation.