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A novel tuned heave plate system for heave motion suppression and energy harvesting on semi-submersible platforms

Science China(Technological Sciences) 2016年第6期59卷 897-912页

作者： LIU Kun OU jin ping School of Civil Engineering Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Institute of Ocean Deep Water Engineering Dalian University of Technology

Deepwater offshore structures such as semi-submersible platforms suffer powerful ocean waves due to their location and site condition. The long distance away from the shore also brings many difficulties to energy supply for the platform operation. How to reduce the response of the platform and convert the wave energy into electrical power is a meaningful topic. In this paper, a tuned heave plate system(THP) is presented and designed to be employed on a semi-submersible platform for heave motion suppression and energy harvesting. This THP system is composed of spring supports, a power take-off system(PTO), and a heave plate. The PTO system is a permanent magnet linear generator(PMLG), which could directly convert the kinetic energy of the heave plate into electronic power. The stiffness of the spring supports is designed based on the principle of the tuned mass damper(TMD). The numerical model of the platform and the THP system is established according to the hydrodynamic analysis results of the platform. The model is tested and modified by scale model tests on the platform in the wave tank. A parameter study, including the size, tuned period, and damping ratio of the THP system, is conducted systematically based on the numerical model. The optimal parameters of the THP are selected due to the maximum heave motion reduction under severe wave conditions in South China Sea. The performance of the semi-submersible with and without the THP system under different wave conditions is analyzed. It is demonstrated that this novel tuned heave plate system could reduce the heave motion of the semi-submersible platform significantly and generate considerable power, which makes the THP system have a broad prospect for development.

关键词： heave motion semi-submersible wave energy harvesting wave energy converter TMD

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Resting Study of Tracer Experiment on Catalytic Wet Oxidation Reactor under Micro-gravity and Earth Gravity Conditions

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Chemical Research in Chinese Universities 2005年第6期21卷 702-706页

作者： YANG Ji JIA jin-ping School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 P. R. China

The International Space Station（ISS） employs catalytic wet oxidation carried out in a Volatile Reactor Assembly （VRA） for water recycling. Previous earth gravity experiments show that the VRA is very effective at removing polar, low molecular weight organics. To compare the reactor performance under micro-gravity and Earth gravity conditions, a tracer study was performed on a space shuttle in 1999 by using 0.2% potassium carbonate as the chemical tracer. In this paper, the experimental data were analyzed and it is indicated that the reactor can be considered as a plug flow one under both micro-gravity and earth gravity experimental conditions. It has also been proved that dispersion is not important in the VRA reactor under the experimental conditions. Tracer retardation was observed in the experiments and it is most likely caused by catalyst adsorption. It is concluded that the following reasons may also have influence on the retardation of mean residence time ：（1） the liquid can be held by appurtenances, which will retard the mean residence time; （2） the pores can hold the tracer, which can also retard the mean residence time.

关键词： Tracer study Micro-gravity Dispersion model Tank in series model Catalytic wet oxidation

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X-ray Flashes from Off-axis Nonuniform Jets

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Chinese Journal of Astronomy and Astrophysics 2004年第5期4卷 473-480页

作者： Zhi-ping jin Da-Ming Wei Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008 National Astronomical Observatories Chinese Academy of SciencesBeijing 100012

It has been widely believed that the outflows in gamma-ray bursts are jetted and some jets may have structures like ∈(θ)∝θ-k. We check the possibility that X-ray flashes come from such jets. Both qualitative and quantitative analyses have shown that this model can reproduce most of the observational features of both X-ray flashes and gamma-ray bursts. Using the usual parameters of gamma-ray bursts, we have carried out numerical calculations for both uniform and nonuniform jets, of their fluxes, spectra and peak energies. It seems that nonuniform jets are more appropriate to these observational properties than uniform jets. We have also shown that in our model the observational ratio of gamma-ray bursts to X-ray flashes is about a few units.

关键词： X-rays general-gamma rays bursts-ISM jets and outflows

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Experimental study of hydrogen-rich/oxygen-rich gas–gas injectors

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Chinese Journal of Aeronautics 2013年第5期26卷 1164-1172页

作者： jin ping Li Mao Cai Guobiao School of Astronautics Beihang University

Five types of coaxial injectors were investigated experimentally using hot hydrogen-rich gas and oxygen-rich gas, which were respectively provided by a GH2/GO2 hydrogen-rich perburner and a GH2/GO2 oxygen-rich preburner. The injectors were the shear coaxial injector, the oxidizer post expansion coaxial injector, the fuel impinging coaxial injector, the central body coaxial injector, and the shear tri-coaxial injector. The characteristic velocity efficiency and the combustor＇s wall temperatures were obtained for different design parameters through the experiments. It can be con- cluded that angles of the oxidizer post expansion and the fuel impinging have little influence on the combustion performance and the wall temperatures. The contact area between fuel and oxidizer and the mass flow rate have significant impacts on the combustion performance. The shear tri-coaxial injector has the best combustion performance but also the highest wall temperatures among the five types of injectors.

关键词： Combustion performance Experiment Gas-gas injector High mass flow rate Wall temperature

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CONVERGENCE RATE OF A GENERALIZED ADDITIVE SCHWARZ ALGORITHM

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Journal of Computational Mathematics 2006年第5期24卷 635-646页

作者： jin-ping Zeng Gao-jie Chen College of Mathematics and Econometrics Hunan University Changsha 410082 China

The convergence rate of a generalized additive Schwarz algorithm for solving boundary value problems of elliptic partial differential equations is studied. A quantitative analysis of the convergence rate is given for the model Dirichlet problem. It will be shown that a greater acceleration of the algorithm can be obtained by choosing the parameter suitably. Some numerical tests are also presented in this paper.

关键词： Schwarz additive algorithm Convergence rate Dirichlet problem.

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A review on photoelectrochemical cathodic protection semiconductor thin films for metals

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Green Energy & Environment 2017年第4期2卷 331-362页

作者： Yuyu Bu jin-ping Ao Institute of Technology and Science Tokushima University

Photoelectrochemical(PEC) cathodic protection is considered as an environment friendly method for metals anticorrosion. In this technology, a n-type semiconductor photoanode provides the photogenerated electrons for metal to achieve cathodic protection. Comparing with traditional PEC photoanode for water splitting, it requires the photoanode providing a suitable cathodic potential for the metal, instead of pursuit ultimate photon to electric conversion efficiency, thus it is a more possible PEC technology for engineering application. To date, great efforts have been devoted to developing novel n-type semiconductors and advanced modification method to improve the performance on PEC cathodic protection metals. Herein, recent progresses in this field are summarized. We highlight the fabrication process of PEC cathodic protection thin film, various nanostructure controlling, doping, compositing methods and their operation mechanism. Finally, the current challenges and future potential works on improving the PEC cathodic protection performance are discussed.

关键词： Photoelectrochemical cathodic protection TiO2photoanode SrTiO3 g-C3N4 Photo-electron storage

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On Mutually Orthogonal Extraordinary Supersquares

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Acta Mathematicae Applicatae Sinica 2021年第4期37卷 697-705页

作者： jin-ping FAN Hai-tao CAO Department of Mathematics Shanghai Normal UniversityShanghai200234China Institute of Mathematics Nanjing Normal UniversityNanjing210023China

Let Fd be the finite field with d *** subgroups in Fd×Fd play an important role in the field of quantum information theory,especially for the study of mutually unbiased ***,Ghiu et *** the concept of supersquare of order d which is related to extraordinary *** have given a method of construction of the mutually orthogonal supersquares,and determined all the complete sets of mutually orthogonal extraordinary supersquares of order *** this article,we present the construction of a complete set of mutually orthogonal extraordinary supersquares of order pn where p is a *** also determine all the complete sets of mutually orthogonal extraordinary supersquares of order 9.

关键词： extraordinary subgroup supersquare mutually orthogonal extraordinary supersquare finite field

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A New Subspace Correction Method for Nonlinear Unconstrained Convex Optimization Problems

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 745-756页

作者： Rong-liang CHEN jin-ping ZENG College of Mathematics and Econometrics Hunan University College of Computer Dongguan University of Technology

This paper gives a new subspace correction algorithm for nonlinear unconstrained convex optimization problems based on the multigrid approach proposed by S. Nash in 2000 and the subspace correction algorithm proposed by X. Tai and J. Xu in 2001. Under some reasonable assumptions, we obtain the convergence as well as a convergence rate estimate for the algorithm. Numerical results show that the algorithm is effective.

关键词： nonlinear optimization convergence subspace correction method

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Multisplitting Iteration Schemes for Solving a Class of Nonlinear Complementarity Problems

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Acta Mathematicae Applicatae Sinica 2007年第1期23卷 79-90页

作者： Chen-liang Li jin-ping Zeng College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China Department of Computational Science and Mathematics Guilin University of Electronics Technology Guilin541004 China Institute of Applied Mathematics Hunan University Changsha 410082 China

We consider several synchronous and asynchronous multisplitting iteration schemes for solving a class of nonlinear complementarity problems with the system matrix being an H-matrix. We establish the convergence theorems for the schemes. The numerical experiments show that the schemes are efficient for solving the class of nonlinear complementarity problems.

关键词： Nonlinear complementarity problems asynchronous iteration H-matrix multisplitting method

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An SQP Algorithm with Cautious Updating Criteria for Nonlinear Degenerate Problems

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 33-42页

作者： Tao-wen Liu jin-ping Zeng College of Mathematics and Econometrics Hunan University Changsha 410082 China College of Software Dongguan University of Technology Dongguan 523808 China

An efficient SQP algorithm for solving nonlinear degenerate problems is proposed in the paper. At each iteration of the algorithm, a quadratic programming subproblem, which is always feasible by introducing a slack variable, is solved to obtain a search direction. The steplength along this direction is computed by employing the 1∞ exact penalty function through Armijo-type line search scheme. The algorithm is proved to be convergent globally under mild conditions.

关键词： Degenerate problem exact penalty function SQP algorithm cautious update criteria globalconvergence

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