Lecture-02-18-08 - 1 MECH 668 Vehicle Noise, Vibration and...

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1 MECH 668 Vehicle Noise, Vibration and Harshness (NVH) Vehicle Sound Quality Theory Winter 2008
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2 Vehicle Sound Quality (SQ) SQ is the perceptual reaction to the sound of a product that reflects the listener’s reaction to the acceptability of that sound for that product; the more acceptable, the better the SQ. [Ref. Lyon (2000)]
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3 Sound Quality Factors
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4 Sound Pressure Level Ratio of squared sound pressure amplitude to the threshold of hearing where P ref = 20 x 10 -6 Pa = 2 2 10 log 10 ref P p p L
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5 Sound Pressure Level Addition Combined Sound pressure level of different sounds with different frequencies = 10 10 10 log 10 i L P L = 2 2 10 log 10 ref i P p p L
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6 SPL Example Calculations 0 10 20 30 40 50 60 70 SPL (dB) f1 f2 f3 f4 Frequency (Hz) + + + = 10 67 10 50 10 62 10 60 10 10 10 10 10 log 10 P L 86 . 68 = P L dB 67 50 62 60 L i (dB) 4 3 2 1 i
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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-02-18-08 - 1 MECH 668 Vehicle Noise, Vibration and...

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