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8th International Conference on Intelligent Networking and Collaborative Systems (INCoS)

作者： Cao, Wenbin Song, Wenyuan Hu, Qiwei Du, Yinxia Mech Engn Coll Dept Engn Management Shijiazhuang Peoples R China Heibei Polytech Inst Shijiazhuang Peoples R China

ISBN: (纸本)9781509041237

In the past few decades, analytical models for maintenance optimization have been extensively investigated. As research continues, the cases considered during the mathematical modeling are much more practical, as well as complex, which brings many difficulties for solution. In this paper, we present an exact method for solving the selective maintenance model considering multiple maintenance actions. The solution procedure is discussed in detail. Moreover, an example is adopted to verify its efficiency. Compared with total enumeration method, the proposed method can significantly reduce the solution space (about 42.46%). What's more, unlike some intelligent algorithm, this method can always give out an optimal solution. Finally, the effects of available resources on solution space are discussed.

关键词： selective miantnance solution algorithm exact method imperfect maintenance

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Numerical solution to Vinti's Problem

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2015年第9期38卷 1757-1764页

作者： Wiesel, William E. US Air Force Inst Technol Dept Aeronaut & Astronaut Astronaut Engn 2950 Hobson Way Wright Patterson AFB OH 45433 USA

A practical, calculable solution to Vinti's problem is offered. Vinti's problem describes the motion of a satellite orbiting an oblate planet, including the point mass and oblateness J2 terms and differing from the actual geopotential only at the higher harmonics. Vinti's original solution is extended to cover motion over a rotating Earth. An eccentric-anomaly-like transform removes the singularities in the elliptic integrals, rendering them accessible to numerical calculation. The prediction problem requires the simultaneous solution of two Kepler's equations. Reduction to canonical action angle variables can also be accomplished via numerical techniques. This new realization of Vinti's solution is free of series expansions that limit accuracy and uses only simple well-understood numerical techniques. Possible use of Vinti's solution for further efforts is discussed.

关键词： Saturn Eccentric Anomaly Kepler's Equation Earth Satellites Newton Raphson Method Right Ascension Perigee solution algorithm Orbital Elements Earth Core

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A COMPARISON OF DIFFERENT solution algorithmS FOR THE NUMERICAL ANALYSIS OF VEHICLE-BRIDGE INTERACTION

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INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 2014年第2期14卷 1350065-1350081页

作者： Liu, K. Zhang, N. Xia, H. De Roeck, G. Beijing Normal Univ Acad Disaster Reduct & Emergency Management Beijing 100875 Peoples R China Katholieke Univ Leuven Dept Civil Engn B-3001 Louvain Belgium Beijing Jiaotong Univ Dept Civil Engn Beijing 100044 Peoples R China

The interaction between a bridge and a train moving on the bridge is a coupled dynamic problem. The equations of motion of the bridge and the vehicle are coupled by the time dependent contact forces. At each time step, the motion of the bridge influences the forces transferred to the vehicle and this, in turn, changes the forces acting on the bridge. In this paper, a comparison of three different time domain solution algorithms for the coupled equation of motion of the train-bridge system is presented. Guidelines are given for a good choice of the time step.

关键词： Train-bridge interaction solution algorithm time step

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Optimal energy storage system allocation and operation for improving wind power penetration

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IET GENERATION TRANSMISSION & DISTRIBUTION 2015年第16期9卷 2672-2678页

作者： Zheng, Le Hu, Wei Lu, Qiuyu Min, Yong Tsinghua Univ Dept Elect Engn State Key Lab Power Syst Beijing 100084 Peoples R China

In recent years, the energy storage system (ESS) has been demonstrated to be involved in many aspects of the integration of wind power. For ESS application, ESS allocation of the installation location, power rating, and energy rating is the first concern. Different from previous studies, this study emphasises the significance of the ESS operation in the study of ESS allocation. A bi-level-programming-based model is proposed to take the interaction of allocation and operation into consideration at the same time, with the external level optimising allocation and the internal level optimising operation. The complexity assessment and solution algorithm of the model is also discussed. Next, a genetic numerical algorithm is proposed to solve the bi-level model. The authors' results were tested on a modified IEEE 39 bus system and a provincial regional power system to verify both the flexibility and applicability of the proposed model and algorithm. This model is useful for various types of ESS and provides a foundation for ESS application.

关键词： wind power plants energy storage optimisation optimal energy storage system allocation wind power penetration ESS allocation installation location power rating energy rating bilevel-programming-based model external level optimising allocation internal level optimising operation complexity assessment solution algorithm genetic numerical algorithm modified IEEE 39 bus system provincial regional power system

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Drag Minimization Based on the Navier-Stokes Equations Using a Newton-Krylov Approach

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AIAA JOURNAL 2015年第6期53卷 1555-1577页

作者： Osusky, Lana Buckley, Howard Reist, Thomas Zingg, David W. Univ Toronto Toronto ON M3H 5T6 Canada Univ Toronto Inst Aerosp Studies Toronto ON M3H 5T6 Canada

A methodology is presented for performing numerical aerodynamic shape optimization based on the three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations. An initial multiblock structured mesh is first fit with B-spline volumes that form the basis for a hybrid mesh movement scheme that is tightly integrated with the geometry parameterization based on B-spline surfaces. The RANS equations and the one-equation Spalart-Allmaras turbulence model are solved in a fully coupled manner using an efficient parallel Newton-Krylov algorithm with approximate-Schur preconditioning. Gradient evaluations are performed using the discrete-adjoint approach with analytical differentiation of the discrete flow and mesh movement equations. The overall methodology remains robust even in the presence of large shape changes. Several examples of lift-constrained drag minimization are provided, including a study of the common research model wing geometry, a wing-body-tail geometry with a prescribed spanwise load distribution, and a blended-wing-body configuration. An example is provided that demonstrates that a wing optimized based on the Euler equations exhibits substantially inferior performance when subsequently analyzed based on the RANS equations relative to a wing optimized based on the RANS equations.

关键词： Navier Stokes Equations Aerodynamic Shape Optimization Reynolds Averaged Navier Stokes Blended Wing Body Configurations Tail Geometry Euler Equations Spalart Allmaras Turbulence Model solution algorithm Aerodynamic Performance Aircraft Configurations

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Advances in the discrete ordinates and finite volume methods for the solution of radiative heat transfer problems in participating media

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JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2014年 145卷 121-146页

作者： Coelho, Pedro J. Univ Lisbon Inst Super Tecn Dept Mech Engn LAETAIDMEC P-1049001 Lisbon Portugal

Many methods are available for the solution of radiative heat transfer problems in participating media. Among these, the discrete ordinates method (DOM) and the finite volume method (FVM) are among the most widely used ones. They provide a good compromise between accuracy and computational requirements, and they are relatively easy to integrate in CFD codes. This paper surveys recent advances on these numerical methods. Developments concerning the grid structure (e.g., new formulations for axisymmetrical geometries, body-fitted structured and unstructured meshes, embedded boundaries, multi-block grids, local grid refinement), the spatial discretization scheme, and the angular discretization scheme are described. Progress related to the solution accuracy, solution algorithm, alternative formulations, such as the modified DOM and FVM, even-parity formulation, discrete-ordinates interpolation method and method of lines, and parallelization strategies is addressed. The application to non-gray media, variable refractive index media, and transient problems is also reviewed. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Discrete ordinates method Finite volume method Spatial and angular discretization solution accuracy solution algorithm Parallelization strategies

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Ideal adsorbed solution theory solved with direct search minimisation

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COMPUTERS & CHEMICAL ENGINEERING 2014年 71卷 235-240页

作者： Santori, Giulio Luberti, Mauro Ahn, Hyungwoong Univ Edinburgh Sch Engn Inst Mat & Proc Edinburgh EH9 3JL Midlothian Scotland

The ideal adsorbed solution theory (IAST) is the most widespread theory for multicomponent adsorption interpretation. It postulates the existence of an adsorbed phase which behaves as a Raoult ideal solution. The theory results in a system of nonlinear algebraic equations which are solved to know the composition of the adsorbed mixture at equilibrium. In this paper an investigation on an alternative method for the IAST equations solution is proposed which is based on the minimisation of an objective function representing the iso-spreading pressure condition. This approach to the solution of the IAST equations reduces in some cases the computational effort and mitigates the issues of the currently adopted approaches (inversion of functions and initial guess). For binary systems, direct search minimisation approach is faster than the classic IAST equations solution approach up to 19.0 (Dual Langmuir isotherm) and 22.7 times (Toth isotherm). In ternary systems, this difference decreases to 10.4 (O'Brien and Myers isotherm) times. Compared to FASTIAS approach, direct search minimisation is up to 4.2 times slower in ternary systems. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Ideal adsorbed solution theory Adsorption equilibria Adsorption thermodynamics solution algorithm

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A solution method for the optimistic linear semivectorial bilevel optimization problem

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JOURNAL OF INEQUALITIES AND APPLICATIONS 2014年第1期2014卷 1-10页

作者： Lv, Yibing Wan, Zhongping Yangtze Univ Sch Informat & Math Jinzhou 434023 Peoples R China Wuhan Univ Sch Math & Stat Wuhan 430072 Peoples R China

In this paper, the linear semivectorial bilevel programming problem is our concern. Based on the optimal value function reformulation approach, the linear semivectorial bilevel programming problem is transformed into a nonsmooth optimization problem, and a solution algorithm is proposed. We analyze the global and local convergence of the algorithm and give an example to illustrate the algorithm proposed in this paper.

关键词： linear semivectorial bilevel programming problem optimal value function solution algorithm

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Strategic planning, design, and development of the shale gas supply chain network

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AICHE JOURNAL 2014年第6期60卷 2122-2142页

作者： Cafaro, Diego C. Grossmann, Ignacio E. INTEC UNL CONICET RA-3000 Santa Fe Argentina Carnegie Mellon Univ Dept Chem Engn Pittsburgh PA 15213 USA

The long-term planning of the shale gas supply chain is a relevant problem that has not been addressed before in the literature. This article presents a mixed-integer nonlinear programming (MINLP) model to optimally determine the number of wells to drill at every location, the size of gas processing plants, the section and length of pipelines for gathering raw gas and delivering processed gas and by-products, the power of gas compressors, and the amount of freshwater required from reservoirs for drilling and hydraulic fracturing so as to maximize the net present value of the project. Because the proposed model is a large-scale nonconvex MINLP, we develop a decomposition approach based on successively refining a piecewise linear approximation of the objective function. Results on realistic instances show the importance of heavier hydrocarbons to the economics of the project, as well as the optimal usage of the infrastructure by properly planning the drilling strategy. (c) 2014 American Institute of Chemical Engineers AIChE J, 60: 2122-2142, 2014

关键词： mixed-integer nonlinear programming approach strategic plan supply chain shale gas solution algorithm

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Minimax problems of discrete optimization invariant under majority operators

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COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS 2014年第8期54卷 1327-1336页

作者： Vodolazskii, E. V. Flach, B. Schlesinger, M. I. Int Sci Educ Ctr UA-03680 Kiev Ukraine Czech Tech Univ Prague 16636 Czech Republic

A special class of discrete optimization problems that are stated as a minimax modification of the constraint satisfaction problem is studied. The minimax formulation of the problem generalizes the classical problem to realistic situations where the constraints order the elements of the set by the degree of their feasibility, rather than defining a dichotomy between feasible and infeasible subsets. The invariance of this ordering under an operator is defined, and the discrete minimization of functions invariant under majority operators is proved to have polynomial complexity. A particular algorithm for this minimization is described.

关键词： discrete optimization problem minimax modification solution algorithm

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