Active elevator car noise control method and device

Abstract

The invention discloses an active elevator car noise control method and device. The method comprises steps that at least one noise source is acquired; according to noise signals of the noise source with different frequency bands, offset sound sources which have opposite phases and identical amplitude relative to the noise signals are respectively acquired through calculation; the offset sound sources are played to offset the noise source. According to the method, the active noise reduction technology is employed for the noise source in an elevator car to realize frequency band division of the noise signals, the offset sound sources which have opposite phases and identical amplitude relative to the noise signals are respectively acquired through calculation, and the offset sound sources are played to offset the noise source. The method is advantaged in that the complex elevator environment is fully considered, the method is applicable to occasions with relatively large noise frequency change, change for the elevator car is relatively small, the method is applicable to reconstruction of old elevators, the construction process is simple, for newly-designed elevators, design difficulty of the elevators does not increase.

Description

technical field [0001] The invention relates to elevator noise reduction technology, in particular to an elevator car noise active control method and device. Background technique [0002] Noise reduction methods can be roughly divided into two types: active noise reduction and passive noise reduction. The passive noise reduction method uses physical materials to absorb and reduce noise. Today's high-speed elevators use passive noise reduction technology; active noise reduction neutralizes the noise by generating anti-phase sound waves equal to the amplitude of the noise, thereby achieving noise reduction. Effect. [0003] When the elevator is running, the friction between the elevator car and the airflow in the hoistway and mechanical parts will generate noise. The faster the elevator speed, the greater the noise. Therefore, high-speed elevators will take some noise reduction measures for the car, such as installing sound-absorbing cotton, damping materials, etc. , belongs...

AI Technical Summary

Problems solved by technology

[0003] When the elevator is running, the friction between the elevator car and the airflow in the hoistway and mechanical parts will generate noise. The faster the elevator speed, the greater the noise. Therefore, high-speed elevators will take some noise reduction measures for the car, such as installing sound-absorbing cotton, damping materials, etc. , belongs to passive noise reduction technology, but these materials only work on high frequency noise

After testing, in the elevator operating environment, the noise energy in the frequency range of 100-400Hz is the largest. The current noise reduction measure for noise in this frequency band is to install a fairing around the car. The disadvantage of this solution is that the process is complicated and the volume is large. And increase the difficulty of elevator design

[0004] However, the noise frequency of the elevator changes greatly and quickly during the process of starting, accelerating, and stopping. The active noise reduction technology in the prior art can deal with most regular environmental noises, but cannot deal with complex noises in the elevator.

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