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Effects of Temperature on Control Performance of Magnetically Levitated Planar Actuators
Rou-gang Zhou,Si-jie Yan,Yun-fei Zhou,Xin Cheng,Chou Jay Tsai Chien 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
During the operation of magnetically levitated planar actuators (MLPAs), the temperature of current coils is rising and the resistancevaries in proportion, thus changing the current loop’s gain and directly affecting the system’s control performance. The coiltemperature also affects the temperature of adjacent magnetic steel, attenuating the residual flux density of magnetic steel andchanging the driving force and torque outputted from coils. In this paper, we analyzed the effects of temperature rise on the controlperformance of MLPAs. 1) A coil temperature analytical model was used to compute real-time coil temperature, and the temperatureparameters were predicted to linearly modify the servo gain coefficient of current loop controller, ensuring that the dynamicperformance of current loop is consistent during the operation of MLPAs. 2) A correction factor modifying the effect of temperatureon magnetic field intensity was added into the current decoupled model, which improved the precision of the dynamics model andsatisfied the strict requirement on the precision of MLPAs.
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( Pei-hua Chen ),( Rou-yun Chen ),( Jui-yu Chou ) 한국균학회 2018 Mycobiology Vol.46 No.1
Gray mold (Botrytis cinerea) is one of the most common diseases of strawberries (Fragaria×ananassa Duchesne) worldwide. Although many chemical fungicides are used for controlling the growth of B. cinerea, the risk of the fungus developing chemical resistance together with consumer demand for reducing the use of chemical fungicides have necessitated an alternative method to control this pathogen. Various naturally occurring microbes aggressively attack plant pathogens and benefit plants by suppressing diseases; these microbes are referred to as biocontrol agents. However, screening of potent biocontrol agents is essential for their further development and commercialization. In this study, 24 strains of yeast with antagonistic ability against gray mold were isolated, and the antifungal activity of the volatile and diffusible metabolites was evaluated. Putative mechanisms of action associated with the biocontrol capacity of yeast strains against B. cinerea were studied through in vitro and in vivo assays. The volatile organic compounds produced by the Galactomyces candidum JYC1146 could be useful in the biological control of plant pathogens and therefore are potential alternative fungicides with low environmental impact.
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