Zhang J.,Hunan First Normal University |
He J.,Guangdong University of Petrochemical Technology
IEEE Photonics Journal | Year: 2017
In this paper, we propose a new kind of circular Airy beam whose spectrum is imposed an initial quadratic phase modulation (QPM). Unlike common abruptly autofocusing beams, we find that such modulated circular Airy beams (MCAB) at image plane, i.e., initial plane, may be morphed into conventional Airy patterns or Bessel-like patterns in spatial regime, depending on the magnitude of QPM. We further investigate the propagation characteristics of the MCAB both analytically and numerically. It is found that the focal intensity, as well as the size of focal spot, do not change with the QPM, but the latter greatly affects the focal trajectory and the focal position of MCAB. In particular, we show that, for the case of Airy pattern, MCAB will exhibit a dual abruptly focusing behaviors having the same focal intensity as well as size of focal spot, where there is one focus behind the image plane, and the another one is in front of it. On the other hand, for the case of Bessel-like pattern, the dual abruptly foci are simultaneously observed behind the image plane for positive QPM but in front of it for negative QPM, thus leading to the formation of an elegant optical bottle with paraboloidal shape. Such novel dual focusing behaviors are expected to be applied in the field of optical trapping and particle acceleration. © 2016 IEEE.
Zhao J.-Y.,Guangdong University of Petrochemical Technology
CIE 2016: 46th International Conferences on Computers and Industrial Engineering | Year: 2016
With simulation model of the manufacturing process in Fluorine Roller Workshop by Witness, which was run on computer, we can obtain such information of the production logistics system as manufacturing outcome, rate of equipment utilization, as well as some issues which were related to material handling and production bottleneck. By the analysis of the simulation results, had pointed out each kinds of question existed in the production process and came up with the improvement plan, simulation model's running results show that the improvement plan can make the production capacity increase by 30%.
Ren H.,Guangdong University of Petrochemical Technology |
Deng F.,South China University of Technology
ISA Transactions | Year: 2017
This paper investigates the mean square consensus problem of dynamical networks of leader-following multi-agent systems with measurement noises and time-varying delays. We consider that the fixed undirected communication topologies are connected. A neighbor-based tracking algorithm together with distributed estimators are presented. Using tools of algebraic graph theory and the Gronwall-Bellman-Halanay type inequality, we establish sufficient conditions to reach consensus in mean square sense via the proposed consensus protocols. Finally, a numerical simulation is provided to demonstrate the effectiveness of the obtained theoretical result. © 2017 ISA.
Chen Y.,Guangdong University of Petrochemical Technology |
Huang P.,South China University of Technology
Tribology Letters | Year: 2017
Optical interferometry is one of the most important methods used to measure lubricant film thickness. Based on the principle of relative optical interference intensity and using monochromatic light, this paper proposes an improved interference method to measure lubricant film thickness. First, a universal formula for calculating lubricant film thickness is deduced according to the basic principle of relative optical interference intensity. Then, based on the actual curve describing the relationship between the light intensity and film thickness, the accuracy of the interference method for monochromatic light is improved. The methods used to calibrate the inference order are also discussed. This paper uses the proposed method to measure the lubricant film thickness of base oil. The proposed method was validated through measurements and compared to the calculation results from the Hamrock–Dowson formula and another measurement method. Finally, a fitting formula for calculating the film thickness was derived for the light loading and high-velocity conditions. © 2017, Springer Science+Business Media, LLC.
Han G.,Hohai University |
Liu L.,Hohai University |
Jiang J.,Hohai University |
Shu L.,Guangdong University of Petrochemical Technology |
Hancke G.,City University of Hong Kong
IEEE Transactions on Industrial Informatics | Year: 2017
Recent breakthroughs in wireless technologies have greatly spurred the emergence of industrial wireless sensor networks (IWSNs). To facilitate the adaptation of IWSNs to industrial applications, concerns about networks' full coverage and connectivity must be addressed to fulfill reliability and real-time requirements. Although connected target coverage (CTC) algorithms in general sensor networks have been extensively studied, little attention has been paid to reveal both the applicability and limitations of different coverage strategies from an industrial viewpoint. In this paper, we analyze characteristics of four recent energy-efficient coverage strategies by carefully choosing four representative connected coverage algorithms: 1) communication weighted greedy cover; 2) optimized connected coverage heuristic; 3) overlapped target and connected coverage; and 4) adjustable range set covers. Through a detailed comparison in terms of network lifetime, coverage time, average energy consumption, ratio of dead nodes, etc., characteristics of basic design ideas used to optimize coverage and network connectivity of IWSNs are embodied. Various network parameters are simulated in a noisy environment to obtain the optimal network coverage. The most appropriate industrial field for each algorithm is also described based on coverage properties. Our study aims to provide IWSNs designers with useful insights to choose an appropriate coverage strategy and achieve expected performance indicators in different industrial applications. © 2005-2012 IEEE.
Li M.,Guangdong University of Petrochemical Technology
International Journal of Smart Home | Year: 2016
Smart home contains all the living functions of the traditional home, and provides a more safe, comfortable and high-tech home space. With the development and popularization of multimedia technology, computer technology has been applied to music classroom, laboratory, music hall, almost all aspects of music teaching and research. In this paper, the author analyzes smart home education and multimedia network teaching platform in piano music education. Multimedia combined with different teaching characteristics, through the modern media as the carrier of the communication channels, then process the formation of vivid images or sounds of music. Along with the digital process of music classroom, computer music workstations, multimedia, distance learning, portable music systems, online interactive music creation, and other technologies are being popularized. © 2016 SERSC.
Yu D.,Tianjin University |
Chen G.,Tianjin University |
Yu W.,Nuclear Power Institute of China |
Li D.,Guangdong University of Petrochemical Technology |
Chen X.,Tianjin University
International Journal of Plasticity | Year: 2012
Experimental results of monotonic uniaxial tensile tests at different strain rates and the reversed strain cycling test showed the characteristics of rate-dependence and cyclic hardening of Z2CND18.12N austenitic stainless steel at room temperature, respectively. Based on the Ohno-Wang kinematic hardening rule, a visco-plastic constitutive model incorporated with isotropic hardening was developed to describe the uniaxial ratcheting behavior of Z2CND18.12N steel under various stress-controlled loading conditions. Predicted results of the developed model agreed better with experimental results when the ratcheting strain level became higher, but the developed model overestimated the ratcheting deformation in other cases. A modified model was proposed to improve the prediction accuracy. In the modified model, the parameter mi of the Ohno-Wang kinematic hardening rule was developed to evolve with the accumulated plastic strain. Simulation results of the modified model proved much better agreement with experiments. © 2011 Elsevier Ltd. All rights reserved.
Wang F.,Guangdong University of Petrochemical Technology
Advances in Science and Technology of Water Resources | Year: 2014
In order to investigate the fractal features of meandering rivers, the divider dimension was used as a parameter to describe the internal structure of river patterns. It is proven that the divider dimension is equal to the Housdorff dimension. The divider dimensions of the lower Jingjiang River and its three local sections in six historical periods from 1496 to 2013 were computed, quantitatively characterizing the evolution laws of the river patterns. The results show that, compared with the sinuosity coefficient, the divider dimensions can better characterize the river pattern and its evolution laws.
Chen H.,Guangdong University of Petrochemical Technology |
Hu S.,Guangdong University of Petrochemical Technology
Optics Communications | Year: 2014
The optical solitons in parity-time (PT) symmetric mixed Bessel linear potential and modulated nonlinear lattices are studied, including linear case, and self-focusing modulated nonlinear lattices' cases. For linear case, the PT-breaking points, the eigenvalues and eigenfunction for different modulated depths of PT symmetry Bessel complex potential, are obtained numerically. The eigenvalue for linear case is equal to the critical propagation constant b c of soliton existence. With increasing of the depth of the nonlinear lattices, the power of fundamental solitons decreases and the beam width changes little, but the power of multipole solitons increases and the beam width decreases. Fundamental solitons are stable in the whole region and multipole solitons are stable with the propagation constants close to bc. The range of multipole solitons stability decreases with increasing of the depth of the nonlinear lattices. © 2014 Elsevier B.V.
Hu S.,Guangdong University of Petrochemical Technology |
Hu W.,South China Normal University
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2012
Optical solitons in the parity-time (PT)-symmetric Bessel complex potential are studied, including the linear case, and self-focusing and self-defocusing nonlinear cases. For the linear case, the PT-symmetric breaking points, eigenvalues and the eigenfunction for different modulated depths of the PT-symmetric Bessel complex potential are obtained numerically. The PT-symmetric breaking points increase linearly with increasing the real part of the modulated depths of the PT potential. Below the PT-symmetric breaking points, the eigenfunctions of linear modes are symmetrical; however, the symmetries of the eigenfunction break above the PT-symmetric breaking points. For nonlinear cases, the existence and stability of fundamental and multipole solitons are studied in self-focusing and self-defocusing media. The eigenvalue for the linear case is equal to the critical propagation constant b c of the existing soliton. Fundamental solitons are stable in the whole region and multipole solitons are stable with the propagation constants being close to b c both for self-focusing and self-defocusing nonlinearities. The range of solitons stability decreases with an increase of the number of the intensity peaks of the solitons. © 2012 IOP Publishing Ltd.