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In this paper, electromagnetic dynamic characteristics of suspension system of middle-low speed Maglev train are analyzed with hybrid simulation method. The structure of Maglev rolling stock and suspension system is introduced, and the finite element analysis(FEA) method is applied in calculating the coupled rail-electromagnet pair. Dynamic model of rail, electromagnet and controller is established,...
Based on the capability of orthogonal wavelet transform in de-noise and trend extract function of EMD, a new noise filter and trend extraction model is built up. Then, simulated data is used to test the method. The following conclusions are drawn from these tests: (1) Orthogonal wavelet transform and EMD method can better mitigate the random errors which hide in periodic signal; (2) For signal with...
Biometric watermarking refers to the incorporation of biometrics and watermarking technology. In this paper we proposed a novel biometrics watermarking scheme in the host as notice of legitimate. In the watermark embedding process, the wavelet coefficients of the host image are grouped into wavelet trees and each watermark bit is embedded using two trees. The trees are so quantized that they exhibit...
The focus of this paper is to achieve robust recognition of low altitude flying targets in diverse battlefield environmental through extracting their acoustic features. A new feature called SB-RC was proposed based on WPT and RCC in this paper. Allowing variable time-frequency resolution and being immune to noise, WPT was employed to replace FFT in the computation of MFCC to overcome its sensitivity...
Medical image segmentation techniques typically require some form of expert human supervision to provide accurate and consistent identification of anatomic structures of interest. In this paper we briefly explain the traditional wavelet-domain hidden Markov tree (HMT) multi-scale segmentation method and present a multiscale contextual label tree (CLT) method according to the dependency information...
This paper presents a new harmonic measurement scheme on lifting wavelet transform based adaptive filter (LWTAF) for active power filters (APFs). As one of methods to build second-generation wavelets, lifting wavelet transform (LWT) can be easy to achieve in time domain for its original bit location calculation. LWT could lessen calculation complexity and depress course due to its particular structure,...
Bused on mathematical morphology (MM) and complex wavelet, a novel method on power quality (PQ) disturbance detection and location is presented in this paper. At first, a generalized morphology filter with horizontal linear structure elements is designed to filter impulses and random white noises in PQ disturbance signals. Numerical simulation results show that the characteristics of the original...
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