Noise-ed - with frequencies and duration First sign in...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
IE 327 1 IE 327 Introduction to Work Design Dr. Andris Freivalds Class #10
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
IE 327 2 Ch. 6 – Sound and Noise Control Sound – changes in air pressure, stimulus for ear Complex sinusoid format Frequency: 20-20,000 Hz Amplitude
Background image of page 2
IE 327 3 Amplitude = Intensity Measured in dB = 20 log 10 P 1 /P 0 P 0 =threshold of hearing, Range = 0-150 dB
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
IE 327 4 Equal Loudness Contours (A-scale)
Background image of page 4
IE 327 5 Anatomy of the Ear Complex process-pneumatic, mechanical, hydraulic, mechanical, electrical
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
IE 327 6 Cochlea – Hair Cells
Background image of page 6
IE 327 7 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
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 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 conduction tests) IE 327 8 Noise Measurement Sound level meter A-scale (~ human ear) C-scale (~ flat) Slow (1-sec average) Fast (impulse noise) Adding noise levels L tot = 10 log 10 (10 L1/10 + 10 L2/10 + . .) IE 327 9 OSHA Limits on Noise Noise dose (D) = C 1 /T 1 + C 2 /T 2 + . . 1 Hours dBA 16 85 8 90 6 92 4 95 3 97 2 100 1 105 0.5 110 IE 327 10 Time-Weighted Average TWA = 16.61 x log D + 90 IE 327 11 Noise Control 1) At source, 2) Along path, 3) At receiver...
View Full Document

Page1 / 11

Noise-ed - with frequencies and duration First sign in...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online