高騒音が保全作業者の音情報に与える影響とその改善方法
High noise effects on engineers' sound perception: improving listening capabilities in noisy environments.
著者:
木村 隆一 Ryuichi KIMURA 近藤 恵太 Keita KONDO
発刊日:
公開日:
directionlistening capabilitiesnoisy environments
概要
In a ship's engine room, engineers are surrounded by various noises emitted from the diesel engine, generator, pumps, and other auxiliary machines. During inspections and activities in such environments, workers strive to listen for extraordinary noises issuing from machines and instruments, which might signal a need for maintenance work. I f that practice functions well, proper noise perception helps them perform maintenance work and achieve early detection of abnormalities that would otherwise contribute t o ship accidents.We specifically examined the listening capabilities used to detect extraordinary noises in noisy conditions such as those in engine rooms. This study inve stigated natural human capabilities and administered a questionnaire survey of machine room workers. Examinees were asked to tell the direction from which a certain sound came. Fewer questions were answered correctly in noisy conditions: 20% fewer than with no background noise. Results underscore the difficulty of discerning the correct dir ection from whence sound comes, signaling a deficit of hearing sensitivity. We propose a support system to improve acoustic sensing in noisy conditions. The system's perf ormance was evaluated, revealing a definite improvement in perception of sound information in noisy conditions at around 100 dB, which are typical of a diesel engine room.
