A comparison between the structure-borne sound generated by a low-frequency vibrating plate mounted on a light-weight structure and on a heavy-weight structure

摘要

Vibrating therapy appliances in medical institutions and fitness centers are gaining interest, because of their curative effect on the human body. As the demand of appliances rises, so does the problem of their noise production. A lot of the vibrational energy is passed to the supporting structure, after which it is radiated as audible sound in other rooms of the building (structure-borne sound). This paper describes how a vibrating plate will behave installed on a light-weight wooden structure, on a heavy-weight concrete structure and on a heavy-weight floating floor structure. All supporting structures are part of a floor between two vertically separated transmission rooms. Sound levels of both rooms, as well as acceleration levels of the floors, are measured. The total sound transmission consists of airborne sound transmission and structure-borne sound transmission. The measured sound pressure level is then compared with the predicted sound pressure level achieved by the draft standards prEN 12354-5 and prEN 15657-1 (the reception plate method). It appears that the low-mobility nature of the source will only cause problems when the source's operating frequency lies within a frequency band with a matching source-structure mobility.