Abstract
This paper presents the experimental studies on reducing a vibration level of the lining walls, which are supported resiliently with the steel walls, by using a sound insulating technique.
The following conclusions are obtained:
The contribution of the excitation of air-borne sound can be estimated by measuring the sound pressure and dynamic response of the body.
High density rockwool boards, whose density is 150kg/m3 and thickness is 50mm, are as effective in the insulating efficiency as sound insulating sheet with surface density 3.4kg/m2. These two materials can reduce the vibration level of the lining wall's surface about 10dB in a frequency range, 315-4kHz, comparing to the one without the sound insulation.
It is proposed that the lining walls are supported only on the floating floor and have not any supporting points with steel walls. As high effect of reducing vibrations of the lining walls as that of the floating floor may be attained by this supporting method of the walls which have enough sound insulating power.
