Lecture_02-13-08 - 1 MECH 668 Vehicle Noise, Vibration and...

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1 MECH 668 Vehicle Noise, Vibration and Harshness (NVH) Vibration Control Read Chapter 6 Winter 2008
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2 Vibration Problems ± Excessive component vibrations may cause structural fatigue failure ± Vibrations of steering, seat tracks and rear mirror produce annoyance (ride comfort concerns) 9 Vertical and lateral shake, 10-30Hz 9 Shimmy (steering wheel oscillations), 3-15Hz 9 Sources : road roughness, tire imbalance, non-uniform tires, bent/out-of-round wheels, powertrain excitations ± Brake vibration/shudder, 5-30Hz 9 Transmitted structurally from brake to pedal via hydraulic lines, suspension, etc. 9 Due to on-uniform brake surface and components, foreign agents present and misalignment.
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3 Vibration Control Methods ± Damping of vibrations ± Vibration isolation ± Vibration absorber ± Reduce excitations
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4 Damping Types ± Viscous damping: F damping = c v(t) c = viscous damping coefficient ± Material (Structural) damping: F structural = j η x η = structural damping coefficient ± Coulomb friction damping: F coulomb = N sign(v) N = normal load sign(v) = sign of velocity term
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This note was uploaded on 10/13/2010 for the course MECH 668 taught by Professor Lim during the Winter '08 term at University of Cincinnati.

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Lecture_02-13-08 - 1 MECH 668 Vehicle Noise, Vibration and...

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