Elevator noise vibration low frequency composite vibration damping system - News - Global IC Trade Starts Here Free Join

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The formation of elevator noise is mainly caused by the noise of the equipment body and the solid sound of the medium solid. I. Elevator equipment noise elevator components: mainly by traction machine, lifting steel cable, speed limiter, track, power distribution cabinet, car, buffer And so on. Elevator noise is mainly generated by the following parts:
1. The vibration and noise generated by the traction machine at high speed of the traction machine are medium and low frequency characteristics, and the noise generated by the traction machine is an important part of the elevator noise.
The noise of the power distribution cabinet is mainly when the elevator is turned on and off, and the inrush current generates electric radiation noise, which is pulsed, mainly based on high frequency.
3. The noise of the speed limiter is mainly the noise generated by the speed limit wheel during friction with the speed limiter. It is a “rhythm” sound, and the frequency characteristics are mainly high frequency.
Second, the elevator noise of the solid sound transmission elevator manufacturers equipped with rubber damping block vibration isolation frequency is narrow, vibration and noise transmission efficiency is relatively low can not fundamentally solve the "sound bridge phenomenon", causing 80% vibration noise through the host steel beam from Wall, floor, pillar, and floor slab radiation are caused by the owner's room; concrete and wall are non-uniform media, and the non-homogeneous medium has strong scattering and consumption effects on the high-frequency band when the sound wave is transmitted, which explains the high-frequency sound. The attenuation is fast, causing serious pollution of low-frequency noise; causing the vibration of solid sound (low-frequency noise) inside the building: the design is convenient, and the cost is saved during the design, planning and construction of the building. The elevator room cannot be far away from the A-class room or the elevator. The overhead treatment of the elevator shaft is such that the owner's room shares the wall with the elevator shaft; even the elevator machine room is on the owner's floor.

Why is elevator noise management so difficult?
1. It is necessary to cooperate with professionals in the industry to complete the elevator noise renovation project. Since the elevator is a special equipment, the qualification management is relatively high. The elevator company with qualified construction does not understand the noise control, and the environmental protection company that understands noise control does not have the qualification for elevator installation. This requires the elevator company to provide technical cooperation to successfully complete the treatment. task.
2. Lack of experience in non-professional corporate governance. Without the understanding of the generation and propagation mechanism of elevator noise, airborne sound management methods are used to control solid vibration noise. Even though some environmental protection companies are aware of solid sound transmission, they don’t know much about the theory of vibration reduction and solid sound treatment. They use the noise of the owner to make test items, and they draw the gourds as they like. They are not innovative, not targeted, and often cannot guarantee the satisfaction of the owners. Effect.
From the actual situation, the elevator noise is above 35dB, which is unacceptable to most people. A considerable proportion of people whose noise is between 30dB and 35dB is unacceptable.

The professional technology for elevator noise problem-Elevator vibration damping composite device needs to pay attention to three main aspects of elevator noise. First, the elevator installation stage should consider the elevator installation position, installation mode, partition wall sound insulation, etc. Second, the elevator production unit, Strictly calculated vibration isolation equipment should be used; third, elevator use units should be strengthened to ensure normal operation.
The traditional vibration reduction method of the elevator is to use a single spring damper or rubber pad for negative vibration reduction. The disadvantage of this vibration reduction mode is that the vibration reduction frequency is single and the vibration reduction degree is small. The vibration of the elevator has a wide-band multi-degree of freedom vibration, so the traditional vibration-damping method does not have an ideal vibration-damping effect, which usually causes the housing around the elevator machine room to be interfered by low-frequency noise. Compared with the traditional vibration-damping method, the elevator-specific vibration reduction The composite device is a sublimation of the traditional damping method.
The characteristics of the elevator noise damping composite device are as follows:
1. Low frequency band damping efficiency: The damping band is 1Hz~80 Hz, and the damping rate is greater than 98%, completely blocking the broadband noise propagation generated by the elevator traction machine.
2. Good safety and stability: The special vibration-damping composite device for the elevator fully considers the eccentric vibration problem and the steel stability of the vibration-damping device, so the running stability and safety of the equipment are better.
3. Long service life: the service life is the same as that of the elevator.
Convenient maintenance and operation: the elevator vibration damping composite device does not change the original elevator. Equipped with elevator-specific silencer, the elevator does not generate vibration and noise pollution, and eliminates user complaints caused by vibration and noise pollution, thus becoming a truly environmentally friendly elevator. In addition, in the architectural design, the elevator room has become an environmentally friendly elevator without vibration and noise pollution, so the equipment room layout is more flexible. Different from the governance schemes of other companies, our elevator noise control technical engineers, based on the experience of various noise reduction and environmental protection solutions, use various noise reduction, sound absorbing materials and vibration damping materials for the sound propagation principle of elevator low frequency resonance. Combined with the way to isolate the noise source of the elevator, the design of the elevator environmental protection noise reduction scheme is relatively thorough. This allows the owners to no longer be bothered by the noise of the elevators, allowing the property and real estate developers to avoid unnecessary losses caused by the owners' complaints! It is especially suitable for room noise reduction projects on the same wall of the penthouse and elevator room and the owner's house. The treatment project does not affect the structure and decoration of the owner's home. After the treatment, it can ensure that the owner can hardly hear the noise and vibration of the elevator in the room.

Note: The noise of the elevator is mainly characterized by low-intermediate frequency vibration. Its propagation mode is mainly vibration type, which is transmitted by solid. Therefore, the conventional sound-insulating cotton and sound-insulating panels will not be able to block the noise transmission (we have passed several tests, and it has been confirmed that noise reduction methods such as sound-insulating walls and sound-insulating cotton in the elevator machine room cannot reduce the elevator noise)! Since the noise source is emitted by the elevator, the only solution is to block the sound propagation by adding a noise reduction and damping layer.
In addition: before the installation of the elevator vibration-damping composite device, the elevator traction machine must be lifted and lifted and placed on the four bolt-fixed elevator vibration-damping composite devices.