Multi-channel active noise control system

Abstract

The invention discloses a multi-channel active noise control system. The multi-channel active noise control system comprises a multi-channel active controller, a vibration sensor / reference sensor, a near-field error sensor array, a secondary sound source loudspeaker array and a remote control microphone array, wherein the secondary sound source loudspeaker array and the near-field error sensor array are distributed in a region, in which noises of large-sized equipment need to be controlled, so as to form a virtual noise barrier; the secondary sound source loudspeaker array is arranged on the internal side of the virtual noise barrier; the output of the secondary sound source loudspeaker array is controlled by the multi-channel active controller; the multi-channel active controller is connected with the vibration sensor / reference sensor, the near-field error sensor array, the secondary sound source loudspeaker array and the remote control microphone array; and as an open noise reducing facility, the control system disclosed by the invention has the advantages of no influence from field mounting space, good noise reducing performance, no burden increased to ventilation and heat radiation of the large-sized equipment, no influence on maintenance of the equipment, simple structure, convenience in use and convenience in promotion and application.

Description

technical field [0001] The invention relates to a noise control system, in particular to a system for controlling low-frequency noise of large-scale equipment by using multiple channels. Background technique [0002] At present, there are mainly two ways to reduce the noise of large-scale equipment: one is to reduce the noise of the equipment itself, and the other is to take noise reduction or sound insulation measures outside the equipment. Due to the influence of many factors such as process conditions, it is technically difficult to reduce the noise of the equipment itself. Therefore, the current noise control of large-scale equipment usually adopts external measures, that is, installing elastic anti-vibration supports or rigid springs at the bottom of the equipment or Rubber pads for vibration reduction, or coating treatment on the outdoor wall or installing sound-absorbing bricks and panels to increase the sound absorption coefficient of the wall, or building a sound-in...

AI Technical Summary

Problems solved by technology

However, the cost of noise reduction using the barrier method is relatively high, and there are still problems such as incomplete sealing and noise floating out from the top of the uncapped roof. The noise reduction effect is very limited. The entire barrier needs to be disassembled, which is not only time-consuming and laborious, but also further increases the cost and future operation and maintenance workload

Therefore, the low-frequency noise control of large equipment has become a bottleneck restricting the development of engineering noise control

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