During the development of new automotive powertrain systems, noise and vibration issues often arise. The interaction of driveline dynamic properties with the vehicle system often amplifies the noise and vibration properties to the level of customer awareness. Therefore, new applications of existing technologies often result in unexpected vehicle noise and vibration concerns. Transferring an electromechanical all-wheel drive (AWD) technology into a new front-wheel drive (FWD) based vehicle platform, a driveline torque vibration became an obtrusive issue. Experimental modal analysis techniques revealed the increased sensitivity of this new vehicle platform to torque vibration of the clutching mechanism. Utilizing finite element analysis techniques, a magnetic excitation was discovered within the AWD technology, and countermeasures were optimized. Subtle alteration to the design of the magnetic circuit removed this excitation. The torque vibration was reduced below the level of customer awareness.
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