engleski

Determination of acoustical bridge side effects between double walls using a pulse method

Croatian Radio and Television built two big television studios (1000 m2 and 400 m2) and one big radio studio (400 m2) with control rooms. Because of noise protection requirements, the usual “box in box” design was applied, thus obtaining double and triple dividing walls and double floor and ceiling construction. It was necessary to control the quality of the construction, especially to check if there are any unwanted acoustical bridges. This was done by measuring the transmission of vibration through the partition walls of adjacent rooms. A measuring method with pulse stimulus was developed. A pulse stimulus of a constant and repeatable level was applied on the inner wall and the transmission level was measured on the outer wall. The measuring spots were optimally distributed to provide a statistically acceptable reliability for detection of irregularity in the structure of the studios construction. A test measurement was made on a double wall construction, once with an artificial acoustical bridge, and the next time without it. The difference of acceleration was used as a confident measure for the detection of a possible acoustical bridge.

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