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Liu P.,Engineering Research Center for Waste Oil Recovery Technology and Equipment | Liu P.,Chongqing Technology and Business University
Key Engineering Materials | Year: 2010

In this paper, a new congestion controller is developed to obtain a feedforward and feedback optimal control for networked control systems (NCS) with persistent disturbances. The disturbances have known dynamic characteristics but unknown initial conditions. The disturbance observer is proposed to make the feedforward control law realizable physically. In the approach only the non-linear compensating term, solution of a sequence of adjoint vector differential equations, is required iteration. By taking the finite iteration of non-linear compensating term of optimal solution sequence, a suboptimal control law for NCS with time delay can be obtained. © 2010 Trans Tech Publications. Source


Fu M.,Chongqing Technology and Business University | Gao K.,Engineering Research Center for Waste Oil Recovery Technology and Equipment | Wang R.Q.,Engineering Research Center for Waste Oil Recovery Technology and Equipment | Ding S.G.,Engineering Research Center for Waste Oil Recovery Technology and Equipment
Advanced Materials Research | Year: 2011

Titanium dioxide powder co-doped by Fe3+ and N was prepared in sol-gel method with tetrabutyl titanate as raw material, iron(III) nitrate as source of ferrum, urea as source of nitrogen. The structure and properties of catalysts were characterized by XRD, XPS, DSC, FS, UV-Vis respectively, where XRD represents Fe/N-TiO2 species calcined at 500 °C are classified into anatase pattern with average 17nm diameter of TiO2 crystal; XPS shows iron and nitrogen species dope into the lattice of TiO 2 framework; DSC indicates phase transition temperature 440 °C of the doped TiO2 from amphorous crystalline into anatase and the dopants have a limited effect on transition temperature; UV-Vis reveals stronger absorption of doped TiO2 than that of TiO2 in visible region and red shift of 70nm to 450nm; FS proves poorer electron-hole recombination. On basis of degradation of methylene blue, photocatalytic activities of various catalysts are investigated to identify maximum decolorization at 2g/L of the doped TiO2, i.e., 92% of decolorized efficiency at 2h ultraviolet illumination and 60% decolorized efficiency at 5h visible illumination. Source


Wang L.C.,Xian Jiaotong University | Wang L.C.,Engineering Research Center for Waste Oil Recovery Technology and Equipment | Du L.,Engineering Research Center for Waste Oil Recovery Technology and Equipment | Zhang X.M.,Engineering Research Center for Waste Oil Recovery Technology and Equipment | And 4 more authors.
Science China Technological Sciences | Year: 2011

The research on scroll profiles theory at present mainly is aiming at the single profile and its amelioration or parameter optimization, not aiming at the natural characteristic of the profiles equation of scroll profiles itself. Thus, the intrinsic differential equation bearing on arc-length and tangent direction angle was studied. Using the inherent differential equation and general functional theory, the conversion ideas between the expression of intrinsic differential equation and the expression in Cartesian coordinate was studied, and the condition of involutes characteristic was presented. The detailed analysis of four typical scroll profiles was given. According to the four typical scroll profiles and based on the method of Taylor series, the unified formation of general functional integration scroll profiles was established, which perfected general theory of scroll profiles increasingly. The envelope method to seek conjugation engagement profiles was studied. The unified general functional equation of scroll profiles represented the admissible function scrolls and the conjugation engagement characteristic of which was studied. The engagement condition of conjugation scroll profiles and the expression in Cartesian coordinate of conjugation scroll profiles of general functional integration scroll profiles were educed. Therefore, the restriction of inherent characteristics of single scroll profiles model is broken through. Solid modeling and machine tool path simulation can bridge the gap between design and manufacture which is essential for the design and manufacture of scroll compressors. With this method a perfect solid model can be achieved, which leads to an optimal design in terms of quality, delivery time and cost. The presentation of unified formation of general functional integration scroll profiles represents foundation factor of instinct characteristics of scroll profiles, which widens the design method of scroll compressor for automobile air conditioning. © Science China Press and Springer-Verlag Berlin Heidelberg 2011. Source


Gong H.-F.,Engineering Research Center for Waste Oil Recovery Technology and Equipment | Gong H.-F.,Chongqing University of Technology | Yang Z.-J.,Chongqing University of Technology | Peng Y.,Chongqing Steel and Iron Group. Co. | Zhang X.-M.,Engineering Research Center for Waste Oil Recovery Technology and Equipment
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2015

Reasonable electric field parameters were the key premise to ensure the emulsion oil's efficient demulsification and dewatering under the high voltage pulse electric field, however the study of the theory about the electric field parameters was rarely reported. By establishing the vibration kinetics model of emulsion oil droplet under the high voltage pulse electric field, the swing-frequency characteristics of droplet vibration were studied, and then the resonance frequency and resonance amplitude of droplet were obtained. On the basis of study above, by combining with the condition of droplet's maximum stable tensile deformation and using the method of drawing, the electric field frequency and strength values of emulsion oil's optimal demulsification were then calculated with physical parameters of the system. The experimental results show that, emulsion oil system's optimal demulsification electric field parameters obtained from calculation can enhance the efficient coalescence of the droplets in emulsion. Therefore, the high voltage pulse electric field parameters of emulsion oil's optimal demulsification, determined by nonlinear vibration kinetics, are reasonable and reliable. ©, 2015, Zhejiang University. All right reserved. Source

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