Self-adaptive combined integration filtering apparatus and noise control system and method

Abstract

The invention provides a self-adaptive combined integration filtering apparatus and a noise control system and method. The self-adaptive combined integration filtering apparatus is characterized in that a transfer function is as shown in the specification, wherein tau1, tau2 and tau3 are delaying constants, K is a proportionality coefficient and s is a complex domain unit. According to the self-adaptive combined integration filtering apparatus, an integral combination link and a time-lagging link are overlaid to determine a parameter selection principle for designing a low-pass filter, a high-pass filter and a band-pass filter separately, so that low-frequency noise signal filtering is realized.

Description

technical field [0001] The invention belongs to the field of industrial control, in particular to an adaptive combined integral filter ANC (ActiveNoiseControl) system for processing the low-frequency noise of an electric fan. Background technique [0002] At present, noise control can be divided into two types from its control methods, namely active noise control (ActiveNoiseControl) and passive noise control (PassiveNoiseControl). Most of the traditional noise control adopts passive control methods, such as: sound absorption and noise reduction - Reduce noise, sound insulation and noise reduction through the loss of sound energy in the process of propagation through sound-absorbing materials or structures - Reduce noise by preventing the propagation of sound waves through sound-insulation structures, reduce noise by interference methods, etc. These methods are effective for high-frequency noise, but not as effective for low-frequency noise as active noise control. In addit...

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Problems solved by technology

[0004] (1) For low-frequency noise components, the longer sound wave wavelength can easily pass through obstacles and noise-absorbing structures;

[0005] (2) The newly added sound insulation and sound absorption devices are difficult to deploy under the condition of limited space;

[0006] (3) The noise reduction structure hinders the circulation of air to a certain extent, reducing the cooling / heating efficiency of the internal unit;

Passive control measures often target a specific frequency, resulting in unsatisfactory noise reduction effects

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