Elevator noise mainly consists of two parts: first, the elevator host (the main noise is emitted by the host), and the roof and wall of the top floor residential room are directly connected to the elevator machine room. When the elevator starts and stops, the elevator host's brake is extended and the brake is engaged; The rotation of pulleys and elevators generates significant low-frequency vibration noise, which is transmitted through walls to the top or second floor of the owner's home; The second is the elevator control cabinet. As the control cabinet is fixed in the floor slab of the machine room and rigidly connected to the wall, the noise from contactor suction and electromagnetic radiation during elevator operation is also transmitted to the owner's room through the floor slab. Here we can know that the noise of elevators is not directly related to their quality, but mainly due to the architectural design of the load-bearing walls in the building's computer room. Due to the fact that the noise of elevators is mainly manifested as low to medium frequency vibration, its main propagation path is vibration type solid sound transmission, and its penetration force is strong (the general noise is air as the sound transmission medium). Therefore, conventional soundproof panels can only reduce noise using air as the sound transmission medium, and have no effect on reducing low-frequency noise transmission in elevators. And in this situation, when the noise source is constant, in order to completely solve the noise, only by controlling the propagation path of noise and vibration can noise and vibration be eliminated.

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