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Engine noise control method based on FXLMS algorithm

A noise control and engine technology, applied in the direction of sounding equipment, instruments, etc., to achieve the effect of reducing engine intake noise, small steady-state error, and reducing interior noise

Pending Publication Date: 2019-06-07
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the problem of interior noise caused by the engine intake system, the present invention provides an engine noise control method based on the FXLMS algorithm that has fast convergence speed, small steady-state error, and can significantly reduce the interior noise caused by the engine intake system.

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  • Engine noise control method based on FXLMS algorithm
  • Engine noise control method based on FXLMS algorithm
  • Engine noise control method based on FXLMS algorithm

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Embodiment Construction

[0041] The engine noise control method based on the FXLMS algorithm of this embodiment includes:

[0042] S1. Establish the main control system model of the engine intake noise with the FXLMS algorithm, and use the engine speed to construct the reference signal x(k) of the main control system model;

[0043]S2. Establish an off-line identification structure for the secondary channel transfer function H in the active control system model 2 (z) Perform identification and provide identification results to the active control system model;

[0044] S3. Using the identified active noise control system model to control engine noise.

[0045] The noise of the engine intake system is the main noise source of the sound field inside and outside the car, and it has a particularly significant impact on the noise inside the car. Intake noise is generated by the periodic opening and closing of the intake valve. When the intake valve opens, a pressure pulse is generated in the intake pipe. ...

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Abstract

The invention provides an engine noise control method based on an FXLMS algorithm aiming at the problem of in-vehicle noise caused by an engine air inlet system, belonging to the field of noise control. The method comprises the following steps: S1, establishing a main control system model of engine intake noise by using an FXLMS algorithm, and constructing a reference signal x (k) of the main control system model by using the rotating speed of the engine; S2, establishing an off-line identification structure, identifying a secondary channel transfer function H2(z) in an active control system model, and providing an identification result to the active control system model; and S3, controlling the engine noise by using the identified active noise control system model. In addition, an improved variable step length algorithm is proposed. The algorithm adds the parameter gamma to the step length of the normalized algorithm and replaces beta in the sine variable step length to adjust the amplitude range of the step length. The algorithm not only has the advantages of fast convergence and small steady-state error of the sine variable step length algorithm, but also has the characteristicsthat the normalized algorithm is suitable for a time-varying reference signal, and the parameter is easy to select.

Description

technical field [0001] The invention relates to an active control method for noise inside a vehicle, in particular to an engine noise control method based on an FXLMS algorithm, and belongs to the field of noise control. Background technique [0002] While automobiles bring convenience to people, they also bring problems such as environmental noise pollution. The noise in the car has a great impact on the ride comfort and user satisfaction of the car, and people are paying more and more attention to reducing the noise in the car. Traditional noise reduction methods, such as sound insulation, vibration isolation, mufflers, etc., are basically not effective in controlling low-frequency noise. The active noise control method has a good low-frequency noise reduction effect, and can be targeted and targeted. In recent years, with the development of electronic technology, active noise control has been widely concerned and discussed by researchers. [0003] In the 1990s, the app...

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Application Information

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IPC IPC(8): G10K11/178
Inventor 兰朝凤吕收赵宏运刘岩刘春东
Owner HARBIN UNIV OF SCI & TECH
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