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- 저자 : Shaoming Hong (검색결과 2 건)
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Investigation on Physical Meaning of Three-loop Autopilot
이창훈,Shaoming He,Ju-Hyeon Hong 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
This paper aims to reveal the hidden physical meaning or the working principle of the three-loop autopilot. First, the minimal control structure that ensures the desired dynamic characteristics is analyzed. The results show that the three-loop autopilot has a redundant feedback loop from the minimal control structure standpoint. Based on this observation, its physical meaning is interpreted by utilizing the closed-loop tracking error dynamics in the presence of aerodynamic uncertainties. It turns out that the three-loop autopilot has the minimal control structure with an additional command which is based on the instantaneous direct model reference adaptive control. A clear mechanism of how the aerodynamic uncertainties are compensated is provided in the three-loop autopilot. Finally, numerical simulations are performed to validate our findings. The analysis results in this paper show the beauty of the three-loop autopilot: it can be considered as the most concise form to achieve desired dynamic characteristics and counteract model uncertainties. The potential importance of the results obtained is that they allow us toproperly design the three-loop autopilot by reflecting its physical meaning and have potential directions to improve the performance of the three-loop autopilot as well as the adaptive control.
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Optimization of photocatalytic degradation of Cefradine using a “green” goethite/H2O2 system
Ruiping Li,Shaoming Hong,Xiaocong Li,Bin Zhang,Hailin Tian,Yingping Huang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
An environmental friendly photocatalyst, goethite in the presence of H2O2, was used to remove Cefradinefrom aqueous solution. Four factors were examined using Box–Behnken Design and results wereanalyzed by response surface method. H2O2 concentration had the largest effect on Cefradine removaland the optimal reaction conditions were: H2O2 concentration, 4 mmol/L; solution pH, 5; goethitedosage, 1.2 g/L and illumination time, 9 h. Experimental data on Cefradine removal under optimalconditions closely coincided with model predictions, validating the model. Hydroxyl radicals ( OH) andsuperoxide anion were involved in the Cefradine photodegradation process and that OH makes thelarger contribution.
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