MEC 325 Chapter Notes - Chapter 13: Conductive Hearing Loss, Sound Pressure, Noise Reduction

• School: Ryerson University
• Department: Mechanical Engineering
• Course: MEC 325
• Professor: Fil Salustri

Document Summary

Chapter 13: noise and vibration affects human performance and comfort, they are directly related from an engineering design problem-> reduce vibration, reduce noiseie. steel plate. But for human performance and health, they are different. 4 aspects that make noise unacceptable: (c-hap: it can cause hearing loss, can affect productivity and performance, can be annoying, can interfere with spoken communications. 1a) conductive hearing loss: caused by mechanical rupture or dislocation of the eardrum and the bones in the middle of the ear-> due to sudden intense pressure wave ie. explosion. 1b) prolonged hearing loss: prolonged exposure that caused auditory nerve damage; intensity, frequency and duration of exposure must be considered. For example, noise levels at about 130 db may cause swelling of the hair cells of the organ of corti on short exposure, and destruction of these cells on longer exposure, short noise exposure-> temp swelling-> temp hearing loss.