Lecture-01-14-08 - MECH 668 Vehicle Noise, Vibration and...

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MECH 668 Vehicle Noise, Vibration and Harshness (NVH) Source-path-receiver Model Winter 2008
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2 Source-path-receiver Model Source Path Receiver Combustion forces Gear transmission error Tire-patch excitation Air-borne Structure-borne Interior space Driver’s ear Outside pedestrian Reduce dynamic loads Reduce unsteady motion Isolate excitation source Vibration isolation Transmission loss Modal tuning Absorption Blocking mass Damping Acoustic lining Modal (acoustics) tuning
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3 Road Noise Tire-road patch Axle Suspension Body Passengers’ ears Reduce tire-road surface roughness Tune axle/suspension Isolate with bushings Reduce vib transmissibility Use acoustic lining Tune cavity modes Body Acoustic/ Vibratory Sensitivity Road Noise Spindle Forces Chassis Force Input to Body Tire/Wheel Forces Axle/Subframe/Suspension Vibration Transmissibility
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4 Two-substructure Model Substructure A [H A ] X o(a) Substructure B [H B ] F i(b) Connector [K S ] Body Acoustic/ Vibratory Sensitivity Road Noise Spindle Forces Chassis Force Input to Body Tire/Wheel Forces Axle/Subframe/Suspension Vibration Transmissibility Substructure A Substructure B Connector
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5 Response Formulation { } [] { } ) b ( i B T A ) b ( i ) a ( o F H C H F H X ) b ( i ) b ( c ) a ( c ) a ( o ) b ( i ) a ( o , s = = Excitation
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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-01-14-08 - MECH 668 Vehicle Noise, Vibration and...

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