Psychological Response and Permissible Limit of Intermittent Rattling Noise of Fittings by Low Frequency Noise

Psychological responses and permissible limits of 20 subjects under intermittent rattling noise of a fitting were measured. A subject sits in front of the fitting with glass plates and answers questionnaires for psychological state in/after exposure of intermittent rattling noise from the fitting exposed to low frequency noise. The fitting rattles 10 s cyclically with silent time. The values of ‘loud’, ‘can't bear as living room’ and ‘can't bear as bed room’ increase according to duty factors of rattle time. Permissible limits were measured by LAeq 5 s of rattling noise adjusted by subjects themselves. The permissible limit decreases according to duty factor. Calculated LAeq from LAeq 5 s was almost constant.