Lecture_03-05-08 - 1 MECH 668 Vehicle Noise, Vibration and...

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1 MECH 668 Vehicle Noise, Vibration and Harshness (NVH) Powertrain Vibration and Noise Read Chapter 6 Winter 2008
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2 Powertrain Assembly Engine Transmission Shaft Shaft U-Joint Flex-coupling Flex-coupling Coupling points CV joint CV joint A B C D E F POWERTRAIN
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3 Types of Powertrain NVH Problems ± Vertical and lateral shake due to engine crankshaft imbalances and combustion forces 9 5-30 Hz range 9 First or second order engine imbalance 9 Engine firing frequencies 9 Engine mount resonances 9 Engine accessories ± Engine boom, acceleration noise and crank rumble 9 30-500 Hz 9 Combustion forces (including abnormalities such as spark knock (pinging) and backfiring 9 Friction 9 Mechanical impact (reciprocating components) 9 Tolerance “slap” – varying tolerance due to pistons moving up and down 9 Structure-borne path resonances
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4 Engine Crankshaft Excitations ± Combustion forces ± ± Centrifugal forces of the crankshaft assembly ± Moments on crankshaft
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Lecture_03-05-08 - 1 MECH 668 Vehicle Noise, Vibration and...

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