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Although the hybrid switch consisting of high power Si IGBT and low power SiC MOSFET achieves reduction of losses and cost, there is a severe concern of its short-circuit capability due to its internal SiC MOSFET with small die size. Experimental study shows that the short-circuit capability of hybrid switch is limited by that of SiC MOSFET. The physical mechanism of short-circuit capability of SiC...
A fault diagnosis method is proposed, which is based on Empirical Wavelet Transform (EWT), Auto-Regressive (AR) model and Fuzzy C-Mean clustering (FCM) clustering algorithm, in order to solve the problem of fault category is difficult to identify of rolling bearing fault signal. In this method, the original signal of the rolling bearing is decomposed by the EWT, and several AM-FM components are obtained...
This paper proposes a novel pattern recognition method for rotating machine fault diagnosis. In this work, the proposed method firstly employs the local mean decomposition (LMD) algorithm to decompose the raw vibration signals into a small number of product functions (PFs), and then, the energy of each useful PF is computed and normalized to form an original feature vector, so an original data table...
In order to meet the requirements which include multi-functional measurement, information processing and automatic rotating speed control in the process of vibration experiment, an automated information system for a rotor rig is developed on LabVIEW platform. In measurement and information processing aspects, this system has the multiple functions, such as multi-channel signal acquisition, signal...
This paper presents an improved fuzzy neural network (IFNN) for pattern recognition. The IFNN consists of several sub-networks, which represent different patterns. Each sub-network distinguishes a particular pattern from others, and each pattern corresponds to the certain inputs. In IFNN, an empirical formula tested many times is used to calculate the number of nodes in the hidden layer, and the learning...
Based on the controllable plasma layer conversion principle, the new-type semiconductor pulsed power switch reversely switched dynistor (RSD) turns on uniformly and simultaneously over the whole chip area. It has the advantages of high power and high speed at the same time. The blocking, turn-on and turn-off characteristics of RSD are investigated in this paper systematically. The off-state and on-state...
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