Abstract: In order to solve the problem of high noise and reverberation, created by the punching equipments in a workshop. The whole room can be separated into two parts: high or relative lower noise working regions. a multilayer symmetrical wall structure is established between their border, which has the ability of both absorbing and insulating sound, its structure is designed as follows: (1) the support frames are mainly composed by thin cold formed C-purlins as well as the auxiliary components of pull strips and sleeves, all parts are hidden inside sound absorbing panels of aluminum perforated；(2) The acoustic structural layer is a double symmetrical configuration, made of aluminum perforated plate, glass wool and damping board, which can be welded or nailed fixed to the support frames. In order to evaluate the maximum sound insulation ability, after the completion of the project, a artificial noise source is accepted to provide a accurate acoustic source to measure the noise loss across the wall. The test results show that: the insulation wall can obviously block the noise transmission in the frequency band of 250-5000 Hz, the maximum sound insulation level can be up to 31dB (A). The structure designed in this paper has the advantages of obviously noise insulation, beautiful appearance, simple and convenient construction, and low cost, which can provide a certain reference value for workshop noise control.
