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This paper describes a simple but effective novel self-learning maximum torque per ampere (MTPA) control scheme for interior permanent-magnet synchronous machine (IPMSM) drives to achieve fast dynamic response in tracking the MTPA points without accurate prior knowledge of machine parameters. The proposed self-learning control (SLC) scheme generates the optimal d-axis current command for MTPA operation...
This paper describes a novel self-learning maximum torque per ampere (MTPA) control scheme for interior permanent magnet synchronous machine (IPMSM) drives to achieve fast dynamic response in tracking the MTPA points without accurate prior knowledge of machine parameters. The proposed self-learning control scheme (SLC) generates the optimal d-axis current command for MTPA operation after training...
A robust and geometric invariant digital image watermarking scheme based on robust feature points detector and local Zernike transform is proposed in this paper. The robust feature points detector is proposed based on SIFT algorithm to extract circular patches. A local Zernike moments-based watermarking scheme is raised. Each extracted circular patch is decomposed into a collection of binary patches...
This paper focus on the way to process the new kind of signal, CBOC signal, which is used in the Galileo Global Satellite Navigation System. After an introduction of the CBOC signal, we give the signal processing procedure. In order to take use of the module designed for QPSK signal, the method we illustrated here is based on our early work. During designing of the method, we made simulation by Matlab...
A robust and geometric invariant digital watermarking scheme for gray-level images is proposed in this paper. The scheme carries out watermark embedding and extraction based on histogram in DWT domain. For watermark embedding, the original image is decomposed into the approximation and details sub-bands. Pixels of the approximation sub-band are grouped into m blocks, each of which has the same number...
Multi-modes and dispersion characteristic of ultrasonic Lamb wave make it very complicated in exciting, propagating, receiving and signal processing and difficult to be used in industry ultrasonic non-destructive evaluation and testing. In this paper, firstly the anti-symmetric mode Lamb dispersion characteristics are analysed. Then the anti-symmetric mode dispersion curve in a specific material plate...
The signal processing of Lamb wave is complex because of its multi-mode and frequency-dispersion characteristics. A method to analyze symmetrical single-mode ultrasonic Lamb wave in the time domain is presented. Based on the analysis of frequency-dispersion characteristic of symmetrical mode Lamb wave, we deduced the half analytic expression of its time signal, and implemented simulation computation...
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