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Noise Exposure and the OSHA Standard

Noise Exposure and the OSHA Standard. Presented By: Stephen Jurss, CIH, CSP Civil Engineering Bldg. Rm. B173 TX: 494-9227, sejurss@purdue.edu . Introduction. Definition of Noise?. Unwanted sound. The Physics of Sound. The Physics of Sound. The Physics of Sound. Anatomy of the Human Ear.

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Noise Exposure and the OSHA Standard

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  1. Noise Exposure and the OSHA Standard Presented By: Stephen Jurss, CIH, CSP Civil Engineering Bldg. Rm. B173 TX: 494-9227, sejurss@purdue.edu

  2. Introduction Definition of Noise? Unwanted sound.

  3. The Physics of Sound

  4. The Physics of Sound

  5. The Physics of Sound

  6. Anatomy of the Human Ear

  7. Anatomy of the Human Ear

  8. Noise Convection and Conduction

  9. Physiology of the Cochlea

  10. Cochlea Cilia

  11. Operation of the Cochlea

  12. Healthy Cochlea The cilia ( sensory hairs) appear normal

  13. Damaged Cochlea Loss of cilia as a result of Noise

  14. Sound Levels

  15. OSHA Noise Standard • 2 Program Strategy – Noise Exposure Program – 90 dBA 8 hour TWA(Equivalent Exposure Concept) Hearing Conservation Program – 85 dBA 8 hour TWA TWA- Time Weighted Average

  16. OSHA Regulation – Exposure Level vs Duration

  17. Noise Measuring Equipment Sound Level Meters (SLM) Continuous on-mobile sources Noise Dosimeters Mobile/variable noise sources

  18. Noise Control Measures • Engineering Controls – Enclosure, Sound Dampening and Absorption • Administrative Controls • Use of Hearing Protection Devices - Noise Reduction Rating (NRR)

  19. Hearing Protection Devices and Their Noise Reduction Ratings EAR Foam Plugs (NRR = 29 dB) EAR CARBOFLEX (NRR= 20 dB) Moldex PURAFIT Foam Plugs (NRR=30 dB)

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