The design of fuzzy controller is the key of fuzzy control system, while the core of fuzzy controller design lies in fuzzy rules, whose performance determines the control effect of fuzzy system. General fuzzy rules are obtained from expert experience, in which much subjectivity exists. In this paper, a fuzzy controller is designed by taking an intelligent cantilever beam as the research object. And a method using the genetic algorithm to optimize fuzzy rules is proposed and the genetic coding as well as the fitness function is confirmed. Finally, the simulation model of intelligent cantilever beam is built by Matlab/Simulink, and the vibration control effects of fuzzy controller optimized by genetic algorithm are compared with those un-optimized. The simulation results indicate that the vibration amplitude of intelligent cantilever beam has a significant decrease and the vibration decay rate has a significant increase after the fuzzy rules optimized.
The acute toxic effects of mercury (Hg) and bromoxynil (BX) on Enchytraediae Fridericia bulbosa in OECD soil were investigated. The results suggested there was statistically significant differences (p<0.05) between negative controls and exposure experiments except the lowest concentration of single pollutant. The 14-d LC50 values for F. bulbosa exposed to Hg and BX were 0.73 and 0.48 mg kg-1, respectively. The concentration of BX significantly influenced to the mortality of earthworms by Hg,and BX was the main contributive factor of the combined toxic effects. The interactive effects between Hg and BX were synergistic when the concentrations of BX were 0.25 and 1 mg kg-1. While BX concentration was 4 mg kg-1, the interactive effects were antagonistic. It can be concluded that F. bulbosa is a suitable test species to measure the acute toxicity of HM and pesticide, and the morality may be considered as a valuable and sensitive biomarker diagnose adverse effects of Hg or BX in soil environment.
The effect of biology activity on liquid indicators (pH, SCOD, VSS ,SOP etc.) and solid indicators (PHA , hepatin, TP etc.) of phosphorus-rich waste sludge during the anaerobic digestion were studied in this paper. Sludge used in this study was obtained from a sewage treatment plant in which the A/O process was used. The results indicated that the hydrolyzing of waste sludge was promoted by the addition of bacterium inhibitor in the beginning of experiment. However, the presence of bacterium inhibitor was disadvantage to both hydrolyzed and biological release mechanism of phosphorus in anaerobic digestion system.
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