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Huixuan Zhuang,Qinglin Sun,Zengqiang Chen,Xianyi Zeng 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.6
Robust flight control laws based on back-stepping technology and ADRC method are designed for attitude control of a non-linear aircraft system. First, non-linear aircraft model is introduced and converted to standard equation of state. Then, the extended state observer is applied to estimate the unknown variables, the homologous ADRC is designed to ensure the state variables of the CLS to astringe to the reference state. Next, the stability of ESO and ADRC are analyzed and proven theoretically. At last, the effectiveness of this method is illustrated by extensive comparative simulations. The results acquired from simulation attest that ADRC can achieve better control performance than PID and SMC method.
TRIPLE SOLUTIONS FOR THREE-ORDER PERIODIC BOUNDARY VALUE PROBLEMS WITH SIGN CHANGING NONLINEARITY
Huixuan Tan,Hanying Feng,Xingfang Feng,Yatao Du 한국전산응용수학회 2014 Journal of applied mathematics & informatics Vol.32 No.1
In this paper, we consider the periodic boundary value problem with sign changing nonlinearity u′′′+ ρ³u = ∫(t,u), t∈2 [0,2π], subject to the boundary value conditions: u(i)(0) = u(i)(2π), i = 0,1,2, where ρ∈(0, 1/√3) is a positive constant and f(t,u) is a continuous function. Using Leggett-Williams fixed point theorem, we provide sufficient conditions for the existence of at least three positive solutions to the above boundary value problem. The interesting point is the nonlinear term f may change sign.
Huixuan Zhuang,Qinglin Sun,Zengqiang Chen,Xianyi Zeng 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.11
In this paper, a novel attitude control method for nonlinear missile system is proposed, which combines backstepping technique with linear active disturbance rejection control (LADRC). Firstly, the nonlinear missilemodel is introduced and transformed into the standard state equation. The linear extended state observer (LESO) is used to estimate the unknown variables. Compared with PID control method, the homologous LADRC designensures that the state variables of the closed-loop system converge to the reference state. The stability of LESO and LADRC is theoretically analyzed and proved. A large number of comparative simulations show the effectiveness ofthe method. The simulation results show that LADRC has better control performance than SMC and PID method.
TRIPLE SOLUTIONS FOR THREE-ORDER PERIODIC BOUNDARY VALUE PROBLEMS WITH SIGN CHANGING NONLINEARITY
Tan, Huixuan,Feng, Hanying,Feng, Xingfang,Du, Yatao The Korean Society for Computational and Applied M 2014 Journal of applied mathematics & informatics Vol.32 No.1
In this paper, we consider the periodic boundary value problem with sign changing nonlinearity $$u^{{\prime}{\prime}{\prime}}+{\rho}^3u=f(t,u),\;t{\in}[0,2{\pi}]$$, subject to the boundary value conditions: $$u^{(i)}(0)=u^{(i)}(2{\pi}),\;i=0,1,2$$, where ${\rho}{\in}(o,{\frac{1}{\sqrt{3}}})$ is a positive constant and f(t, u) is a continuous function. Using Leggett-Williams fixed point theorem, we provide sufficient conditions for the existence of at least three positive solutions to the above boundary value problem. The interesting point is the nonlinear term f may change sign.
Qiuling Ma,Huixuan Zhang,Yuqi Cui,Xiaoyong Deng,Ruonan Guo,Xiuwen Cheng,Mingzheng Xie,Qingfeng Cheng 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Cu2O decorated TiO2 nano-tube arrays (Cu2O/TiO2 NTAs) photoelectrode was fabricated throughelectrodeposition strategy. Meanwhile, physicochemical properties of the resulting photoelectrode weresystematically studied by series of measurements. Results indicated that Cu2O/TiO2 NTAs photoelectrodeperformed a significantly enhanced light absorbance in the visible region between 400 and 800 nm,transient photocurrent density of 0.162 mA Cm 2, photogenerated charge separation efficiency and 99.9%of photoelectrocatalytic efficiency for decomposition of 2,4,6-trichlorophenol within 120 min Xenonillumination with the help of +1.0 V (vs. SCE) potential. Furthermore, the enhanced visible lightresponsible photoelectrocatalytic mechanism was proposed and discussed.
Jianfeng Gou,Xiaohui Li,Huixuan Zhang,Ruonan Guo,Xiaoyong Deng,Xiuwen Cheng,Mingzheng Xie,Qingfeng Cheng 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Silver/silver chloride/exfoliated graphite (Ag/AgCl/EG) nano-photocatalyst was synthesized through precipitation and photoreduction processes. Afterwards, physicochemical properties of Ag/AgCl/EG were systematically studied by series of techniques. Results indicated that spherical-like Ag0 and AgCl with a diameter of 18.6 nm were deposited onto the surface of EG, resulting in the large surface area, strong visible absorbance and high charge separation efficiency. In addition, Ag/AgCl/EG exhibited high visible light photocatalytic (PC) activity for degradation of RhB (99.5%) and phenol (89.1%) solution. Also, the enhanced visible light PC mechanism was proposed and confirmed. Furthermore, Ag/AgCl/EG nano-photocatalyst performed good reusability even after six recycles utilization.
Properties of Poly(vinyl chloride)/PB-g-PMMA Composites
Guangfeng Wu,Hailong Zhang,Huixuan Zhang 한국고분자학회 2015 폴리머 Vol.39 No.5
To improve the mechanical properties of poly(vinyl chloride) (PVC), the characters of combining PVC with elastomers were considered. Polybutadiene grafted poly(methyl methacrylate) (PB-g-PMMA, MB) core-shell particles were prepared by emulsion polymerization, and were used as an impact modifier for PVC. The impact resistance, fracture, brittle-ductile transition and the morphology of PVC/MB blends were investigated. It was found that MB particles had a high toughening efficiency for PVC resin, the impact strength was more than 1100 J·m-1 when MB was 8 phr. Two factors influence the impact strength and brittle-ductile transition, one is the modifier content, and the other is core-shell weight ratio. The impact curves are Ω-like shape, the impact strength value is the highest at the middle part and the PVC/ MB blends show ductile break behaviors. The core shell ratio of ductile areas are limited from 80/20 to 90/10 for PVC/MB=100/8, and 70/30 to 93/7 for PVC/MB=100/10.
Yu Fan,Hailong Zhang,Guangfeng Wu,Huixuan Zhang 한국고분자학회 2015 폴리머 Vol.39 No.6
Core-shell structured grafted copolymer particles of butyl acrylate (BA) grafted methyl methacrylate (MMA) and styrene (St) monomers (ACR-g-St) were prepared by seed emulsion polymerization. Poly(vinyl chloride) (PVC)/ACR-g-St blends were proposed. The fusion properties, dynamic mechanical behavior, rheological behavior, mechanical properties and morphology of blends were characterized by a torque rheometer, dynamic mechanical analyzer (DMA), rotational rheometer, universal mechanical testing machine and scanning electron microscope (SEM). The results showed that the ACR-g-St particles accelerated the fusion of PVC resins, but the equilibrium torque increased slightly. The storage modulus (G′), loss modulus (G″) and complex viscosity (η<SUP>*</SUP>) of melts exhibited a monotonic changing with frequency and all had minimum values when ACR-g-St content was 16 phr. The tensile and impact strength were highest at 8 phr content of ACR-g-St. ACR-g-St not only can be used as an efficient impact aid but also plays a role of lubricant, which is helpful for PVC processing.