Active control system and control method for radiation noise of vibration structure

Abstract

The invention discloses an active control system and a control method for the radiation noise of a vibration structure. The control system is arranged on the vibration structure, K piezoelectric sensors obtain K external interference force reference signals which enable the vibration structure to vibrate and radiate noise, the K external interference force reference signals are input into a self-adapting feedforward controller, N control force signals are generated under the action of an algorithm and then are input into N piezoelectric actuation devices, new vibration acceleration distribution is generated in the vibration structure, K external interference forces are counteracted according to a secondary passage, an acoustic radiation mode amplitude value is generated according to a primary passage, an error sensor obtains the previous N stages of radiation mode amplitude value error signals with the strongest capability of radiating the noise during the vibration of the vibration structure and then inputs the previous N stages of radiation mode amplitude value error signals into the self-adapting feedforward controller, and a transverse filter weight coefficient is corrected by a filter weight coefficient iteration system so as to change the control force signals. The invention can obtain better control effect at intermediate frequency and low frequency, has simple structure and is easy to realize the miniaturization of the active control system.

Description

technical field [0001] The invention relates to an active control of the radiation noise of a vibrating structure, in particular to an active control system and an active control method for the radiation noise of a vibrating structure without using acoustic sensors such as microphones and loudspeakers. Background technique [0002] At present, noise has become one of the three major pollution sources that the society is generally concerned about. The noise control technology is mainly based on passive noise control. The specific methods include sound insulation treatment, sound absorption treatment, vibration isolation, damping and vibration reduction, etc. Its main features are that it does not require external energy, simple technology, low cost, reliable performance, and can achieve satisfactory results in controlling high-frequency noise. However, its disadvantages are: the control frequency band for middle and low frequency noise is very narrow, the control effect is no...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned traditional active noise control method and active vibration control method, and propose an active control method that combines the two characteristics of vibration and sound radiation of the structure, which can effectively control the vibration of the structure , so as to ensure the effective reduction of sound radiation

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