ergo12 - Safety and Ergonomics Review!!!! ¡ Visual...

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Unformatted text preview: Safety and Ergonomics Review!!!! ¡ Visual acuity??? ¡ Contrast??? ¡ Trichomaticity??? Spring 2010/ 2011 1 Safety and Ergonomics Human Senses Auditing Safety and Ergonomics Sound ¡ Physical characteristics of sound: ¢ Intensity ¢ Intensity ¢ Frequency ¢ Duration ¡ Psychological characteristics of sound: ¢ Noise ¢ Loudness Spring 2010/ 2011 ¢ Pitch ¢ Understanding of speech 3 Sound ¡ Sound ¢ Vibration that stimulate auditory sensation ¢ Vibration that stimulate auditory sensation ¡ Passage of zones of compression and rarefaction through the air or any other physical media ¡ Frequency ¢ Hz ¡ Intensity, amplitude and sound pressure level Spring 2010/ 2011 ¢ dB ¢ dBA dB in log 20 10 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = P P SPL 4 Safety and Ergonomics Sound ¡ Stimulation depends on age depends on age ¢ Infants 16Hz- 20kHz ¢ Older: rarely above 12kHz Spring 2010/ 2011 5 Ear Spring 2010/ 2011 6 Safety and Ergonomics Ear Spring 2010/ 2011 7 Auditory Sense ¡ Sound Æ outer ear Æ auditory canal (meatus) Æ eardrum ¢ Amplification 10 – 15 dB...
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This note was uploaded on 05/24/2011 for the course INDUSTRIAL IE 221 taught by Professor Maisa during the Spring '11 term at German University in Cairo.

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ergo12 - Safety and Ergonomics Review!!!! ¡ Visual...

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