Topic: Work Environment Design - Noise, Temperature, and Vibration 1. In the Dorben Company, an industrial engineer was assigned to alter the work methods in the press department to meet OSHA standards relative to permissible noise exposures. The IE found a time-weighted average sound level of 100dB. The 20 operators in this department wore earplugs provided by Dorben with an NRR value of 20dB. What improvement resulted? Do you feel that this department is now in compliance with the law? Explain. 2. In the Dorben Co., an all-day study revealed the following noise sources: 0.5 hrs., 110dBA;2 hr., less than 80dBA; 2 hrs., 90dBA;4 hrs., 105dBA. Is this company in compliance? What is the dose exposure? What is the TWA noise level? 3. In problem \#2, consider that the last exposure is in the press room, with five presses operating. Assuming that Dorben Co. can eliminate some of the presses and transfer production to the remaining presses, how many presses should Dorben eliminate so as not to exceed 100% dose exposure for the workers? 4. Would you advocate background music at the workstation? What results would you anticipate? 5. What three classifications have been identified from the standpoint of exposure to vibration? 6. What are the good practices in your company that helps in reducing fatigue experienced by workers from their work environment