IE_Lecture12-ed

IE_Lecture12-ed - Barari- ENGR 3460U 10 Noise = Unwanted...

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Lecture 12 Industrial Ergonomics (ENGR 3460U) Work Environment Design oises Noises structor: Dr Ahmad Barari Instructor: Dr. Ahmad Barari Barari- ENGR 3460U 1
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Ch. 6 – Sound and Noise Control • Sound – changes in air pressure, stimulus for ear • Complex sinusoid format – Frequency: 20-20,000 Hz – Amplitude Barari- ENGR 3460U 2
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ound’s velocity Sound s velocity Barari- ENGR 3460U 3
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Amplitude = Intensity Measured in dB = 20 log 10 P 1 /P 0 P 0 =threshold of hearing Barari- ENGR 3460U 4
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Weighted Sound Level A Weighted Sound Level Range = 0-150 dB Barari- ENGR 3460U 5
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dding Noise Levels Adding Noise Levels dding noise levels Adding noise levels L tot = 10 log 10 (10 L1/10 + 10 L2/10 + . .) Barari- ENGR 3460U 6
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Hearing Loss erve Deafness Nerve Deafness -Broadband eaningful noises -meaningful noises -Octave band analysis Barari- ENGR 3460U 7
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Equal Loudness Contours (A-scale) Barari- ENGR 3460U 8
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Anatomy of the Ear Complex process-pneumatic, hydraulic, mechanical, electrical Barari- ENGR 3460U 9
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Cochlea – Hair Cells
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Unformatted text preview: Barari- ENGR 3460U 10 Noise = Unwanted Sound Startle response, annoyance Interference with speech, sounds (masking) Decreases complex task performance (May improve simple task performance!) Long term exposure hearing loss with frequencies and duration First sign in 4,000-6,000 Hz range Damage to hair cells (nerve damage) Measure with audiometer (bone vs. air Barari- ENGR 3460U 11 conduction tests) OSHA Limits on Noise Noise dose (D) = C 1 /T 1 + C 2 /T 2 + . . 1 Barari- ENGR 3460U 12 xample Example Barari- ENGR 3460U 13 termediate Noise Level Intermediate Noise Level Barari- ENGR 3460U 14 ime-eighted Average Time Weighted Average Barari- ENGR 3460U 15 xample Example Barari- ENGR 3460U 16 oise Control Noise Control Barari- ENGR 3460U 17 Noise Control 1) At source, 2) Along path, 3) At receiver Barari- ENGR 3460U 18...
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IE_Lecture12-ed - Barari- ENGR 3460U 10 Noise = Unwanted...

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