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In order to improve the speed-regulation performance of the permanent-magnet synchronous motor (PMSM) system under uncertainties and disturbances, an equivalent disturbance observer (EDO) based discrete-time integral sliding mode control (DISMC) scheme is proposed. To avoid the high-frequency noise caused by the differential terms of conventional sliding mode control (SMC), a discrete-time integral...
This paper proposed a image fog removal method. The method based on the disinhibition properties of retinal neurons concentric receptive field whose function is three Gaussians. Firstly, we enhance original fog image by using contrast limited global histogram equalization. Secondly, a local image enhancement method is carried out to restore the image's details and deepness information. According to...
To achieve automatic retractable tail frame of scraper conveyor, we applied fuzzy control theory to the hydraulic system of the retractable tail frame, established transfer function model of electromagnetic valve-controlling-hydraulic cylinder, designed fuzzy controller, and carried out simulation of the system using SIMULINK in this paper. Through simulation, we compared the dynamic performance of...
According to the relevant data of 1992-2007, we regard the number of personnel in S&T activities and S&T funds investment as input variables, and the number of patents authorized and the number of papers published as output variables to establish VAR models. The results we got show that S&T funds investments are relatively significant impact effect on the number of patents authorized and...
This paper proposes a geometric way to generate metamorphic configurations and investigates metamorphic principles based on geometrized displacement group. Metamorphic reconfiguration techniques are revealed as variations of kinematic joints, kinematic links and geometric orientation constraints specifically by examining invariant configuration properties of a mechanism. The nature of all these configuration...
Metamorphic mechanisms and metamorphic robots are able to deliberately change their own shape by rearranging the connectivity of their parts. The reconfiguration process of the mechanisms contains various topological configurations with multiple configuration states to accommodate topology transformation. Over the last decade, the study of metamorphic mechanism and metamorphic robotics has advanced...
A new type of generating device with good performance for nonsinusoidal oscillation of the mold in continuous casting is developed namely antiparallel four-bar linkage and its prototype is manufactured in the lab. Further more, dynamic model of the nonsinusoidal oscillation system for the mold driven by this generating device is built and the differential equation of motion is deduced, which shows...
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