Narrowband adaptive method based on structure of cross-band pre-filter bank
A filter bank, narrow-band filter technology, applied in instruments, non-electric variable control, mechanical oscillation control, etc., can solve problems such as method performance degradation, and achieve the effect of reducing sudden change, improving signal-to-noise ratio, and good flexibility
Active Publication Date: 2017-07-28
NAVAL UNIV OF ENG PLA
View PDF5 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
He Lin, Li Yan, and Shuai Changgeng proposed the filtering Newton method in "Time-domain filtered-x-Newton narrowband algorithms for active isolation of frequency-fluctuating vibration", which considered the signal fluctuation problem, but the fluctuation is within the passband
It can be seen from the above that the above narrow-band control method is mainly aimed at the vibration control problem where the line spectrum is completely inside the narrow band, and cannot solve the problem of performance degradation when the vibration line spectrum is at the edge of the narrow band
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0031] First, according to the characteristics of the secondary channel, the target frequency band is reasonably divided under the condition that the narrowband adaptive method is satisfied, and the filter bank B is designed according to the division result 1 , using online or offline methods to obtain the identification secondary channel model K×K order complex square matrix at the center frequency of each frequency band K×K represents K actuators and K sensors. filter bank B 1 Add cross-band bandpass filter as the basis to design filter bank B 2 .
[0032] First, the principle of the method is analyzed by taking the Fx-Newton narrowban...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a narrowband adaptive method based on the structure of a cross-band pre-filter bank, which is used to solve the problem that the convergence rate of a narrowband adaptive algorithm decreases and the control algorithm is unstable when a vibration line spectrum is at the narrowband edge in the active control of mechanical equipment vibration. By improving a pre-filter in the traditional narrowband adaptive method and adding cross-band bandpass filtering on the basis of the structure of the narrowband filter bank, the method of the invention avoids the frequent selection of narrowband filters caused by frequency micro fluctuations when the line spectrum is at the adjacent narrowband edge, and also increases the convergence rate of the adaptive method at the narrowband edge without increasing the calculation of the identification process in the secondary channel characteristics. According to the invention, the structure is simple and practical, and the narrowband adaptive method is enabled to achieve fast and stable convergence in a wide frequency band.
Description
technical field [0001] The invention relates to the field of vibration control, in particular to a narrow-band self-adaptive method based on a front cross-band filter bank structure. Background technique [0002] In recent years, the narrow-band adaptive method has been more and more widely used in the line spectrum isolation caused by mechanical vibration. The function eigenvalue distribution improves the convergence speed of the narrowband adaptive method. It is a common method to extract the line spectrum signal from the signal through a narrowband filter. In practical applications, the target frequency band is often divided into several subbands, and the narrowband adaptive method is used to filter the signal with a narrowband bandpass filter to obtain Several optimal controllers in parallel realize the control of the line spectrum in a wider frequency band. However, the narrowband filter has a certain degree of amplitude attenuation and phase mutation at the edge of i...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G05D19/02
CPCG05D19/02
Inventor 何琳王春雨李彦帅长庚张晓平
Owner NAVAL UNIV OF ENG PLA