ergo13 - Safety and Ergonomics Review! Spring 2010/ 2011 1...

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Safety and Ergonomics Review!!!! Spring 2010/ 2011 1 Noise ± Noises: (unwanted sound, generally “too loud”) ² Contribute to hearing loss ² Interfere with communications ² Annoy or distract people ² Alter performance ± Physiological effects of noise ² Cause a Permanent Threshold Shift: damage to cochlear cilia, or the nerves leading to Central nervous system. Di d t Spring 2010/ 2011 ± Damage is due to: ² Overstimulation of cell metabolism, leading to oxygen depletion and destruction. ² Exceeding the elastic capacities of the physical structures. (above 130 dB) 2
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Safety and Ergonomics Effect of noise on human performance ± As noise becomes more intense, we become more aroused and our performance of certain tasks can improve. ± Beyond a certain level of intensity, however, task performance degrades. ± Sudden, unexpected noise can produce a startle response that interrupts one’s concentration and physical performance of a task. ± Continuous period or a periodic noise interferes with the performance of complex tasks, such as visual tracking, performance is diminished with increasing noise levels. Spring 2010/ 2011 ± Psychological effects of noise include anxiety, helplessness, narrow attention, and other adverse effects that degrade task performance.
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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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ergo13 - Safety and Ergonomics Review! Spring 2010/ 2011 1...

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