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IEEE Symposium on Differential Evolution (SDE)

作者： Domingo, B. M. Ponnambalam, S. G. Kanagaraj, G. Monash Univ Sunway Campus Sch Engn Bandar Sunway 46150 Selangor Darul Malaysia

ISBN: (纸本)9781467358736

This paper presents a random key Differential Evolution algorithm to find the optimal box type sequence and the layer type orientation for a three dimensional single container loading problem. The packing algorithm is based on the layer building approach which groups the boxes of the same type to create layers that are packed into empty spaces in the container. The spaces where layers are represented by maximal empty spaces which are created using difference process. A back bottom left heuristics is used to select the maximal empty space for each layer built. The performance of the DE is tested on seven test cases;each test case consists of 100 instances. The implications of the results show that DE performs well in terms of significant improvement in volume utilization.

关键词： Differential evolution algorithm packing algorithm space utilization container loading problem

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Modeling and simulation of iron ore pellet drying and induration process with accurate bed void fraction calculation

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DRYING TECHNOLOGY 2016年第6期34卷 651-664页

作者： Tan, Shuai Peng, Jun Shi, Hongbo E China Univ Sci & Technol Key Lab Adv Control & Optimizat Chem Proc Minist Educ Informat Sci & Engn Shanghai 200237 Peoples R China Huawei Technol Co Ltd Shanghai Peoples R China

As key parameters of modeling iron ore pellet drying and induration process, the properties of a packing bed are calculated by our proposed method. Derived from realistic spheres-dropping phenomena, the dropping and rolling rules make the moving sphere finally reach its minimum gravitational potential energy. Furthermore, the plastic deformation of green pellets and mechanic vibration are also considered in the model. The model is based on the laws of mass and heat transfer, physical process, and chemical reaction. The partial differential equations of the process kinetic model involve derivatives in time and bed depth. Comparing the results with measured data proves that the model can be used for optimizing the iron ore pellet induration process and as an effective tool for other, similar thermodynamic process simulations.

关键词： Adams-Moulton's method algorithm dropping and rolling rules explicit finite difference grate-kiln system iron ore pellet packing algorithm

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Three-dimensional mesoscale modeling of concrete with convex aggregate based on motion simulation

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CONSTRUCTION AND BUILDING MATERIALS 2021年 277卷

作者： Chen, Tao Xiao, Shiyun Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116024 Liaoning Peoples R China

Numerical simulation using a mesoscale model is an effective method to determine the complex mechanical behaviors of concrete. Establishing a numerical sample with a mesostructure close to realistic concrete is crucial for mesoscale simulation. This paper presents a heuristic packing algorithm for constructing 3D random aggregate models with high aggregate content. In the algorithm, the aggregate packing problem is considered as a problem of optimizing the potential energy of the mesoscale configuration. In the initial state, all aggregate particles are randomly placed inside the specimen container;then, the particles move in the container according to the proposed motion simulation strategy until a feasible spatial configuration is obtained. The framework is suitable for various types of aggregates, including spherical, ellipsoidal, polyhedral, and mixed-type aggregates, that have a support mapping representation. In this study, numerous samples with different types of aggregates were established, and the influence of the aggregate gradation on the packing density was examined. The results verified the efficiency and robustness of the proposed algorithm. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： Three-dimensional modeling Convex aggregates Collision detection Motion simulation packing algorithm

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A methodology for an optimal design of ground-mounted photovoltaic power plants

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APPLIED ENERGY 2022年 314卷

作者： Barbon, A. Bayon-Cueli, C. Bayon, L. Carreira-Fontao, V. Univ Oviedo Dept Elect Engn Oviedo Spain Univ Oviedo Dept Math Oviedo Spain Univ Oviedo Polytech Sch Engn Gijon Oviedo Spain

A methodology for estimating the optimal distribution of photovoltaic modules with a fixed tilt angle in ground-mounted photovoltaic power plants has been described. It uses Geographic Information System, available in the public domain, to estimate Universal Transverse Mercator coordinates of the area which has been selected for the installation of the photovoltaic plant. An open-source geographic information system software, QGIS, has been used. The estimation of the solar irradiance takes into account the variations in the local cloud cover distribution. The optimization process is considered to maximize the amount of energy absorbed by the photovoltaic plant using a packing algorithm (in MathematicaT software). This packing algorithm calculates the shading between photovoltaic modules. This methodology can be applied to any photovoltaic plant. Different rack configurations and tilt angles are incorporated in the study to account for the characteristics of the irregular shape of the land. The most used rack configurations in photovoltaic plants are the 2V x 12 configuration (2 vertically modules in each row and 12 modules per row) and the 3V x 8 configuration (3 vertically consecutive modules in each row and 8 modules per row). Codes and standards have been used for the structural analysis of these rack configurations. For this purpose, the wind loads, the snow loads, the weight of the structure, the weight of the photovoltaic modules, and combinations thereof have been calculated. This analysis has been performed with AutoDesk Robot Structural Analysis software for the different rack configurations. A detailed cost analysis of the most used rack configurations in photovoltaic plants has been presented. The levelized cost of the produced electricity efficiency is calculated for each rack configuration. The methodology has been applied in Sigena I photovoltaic plant located in Northeast of Spain. The current rack configuration used in this photovoltaic plant is the

关键词： Ground-mounted photovoltaic power plant packing algorithm Rack configuration Structural analysis Cost analysis

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A Software Framework for Simulating Stationkeeping of a Vessel in Discontinuous Ice

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MODELING IDENTIFICATION AND CONTROL 2014年第4期35卷 211-248页

作者： Metrikin, Ivan NTNU Dept Civil & Transport Engn N-7491 Trondheim Norway Statoil ASA Artic Design & Operat N-7053 Trondheim Norway

This paper describes a numerical package for simulating stationkeeping operations of an offshore vessel in floating sea ice. The software has found broad usage in both academic and industrial projects related to design and operations of floating structures in the Arctic. Interactions with both intact and broken ice conditions can be simulated by the numerical tool, but the main emphasis is placed on modelling managed ice environments relevant for prospective petroleum industry operations in the Arctic. The paper gives a thorough description of the numerical tool from both theoretical and software implementation perspectives. Structural meshing, ice field generation, multibody modelling and ice breaking aspects of the model are presented and discussed. Finally, the main assumptions and limitations of the computational techniques are elucidated and further work directions are suggested.

关键词： global ice loads numerical simulation physics engine computational geometry packing algorithm

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Vehicles for the Service Economy: Early-stage Vehicle Concept Designs for Vehicle-based Service

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Procedia CIRP 2023年 119卷 746-751页

作者： Clemens Pizzinini Leonhard Langer Irénée Froissart Ahmed Elsayed Markus Lienkamp

Future vehicles are connected, autonomous and shared platforms that render a multitude of services in our everyday lives. The vehicle's driving function will ultimately converge to a commodity sourced by superstructure manufactures that develop service-oriented functionality. For the early stage vehicle concept design, this new functionality imposes a new complexity for superstructure engineers. Novel service offerings translate into new functional requirements and technical components that need to be optimally sized and positioned inside the vehicle package to increase the amount of service units that can be supplied to the customer. Today, vehicle concept design optimization only focuses on powertrain components. In this paper, we introduce a novel two-step package design optimization for vehicle superstructures. First, functional requirements are derived from service units, the smallest unit of value to the vehicle-based service customer. We then develop component weight and size regression models from data retrieved from online warehouses. Components and their installation constrains are represented by scalable containers. A combined packing heuristic and parameter optimization arranges the containers within the vehicle's available installation space and created layout alternatives. We apply this procedure to a real case study based on the aCar, a light electric utility vehicle for rural sub-Saharan Africa. This is a first step to enable superstructure manufactures to design and optimize vehicle concept designs based on service capacity.

关键词： packing algorithm vehicle-based service vehicle concept design

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OPTIMAL CARRIER SHARING IN WIRELESS TDMA

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Journal of Interconnection Networks 2001年第2期2卷 189-211页

作者： S. C. BORST E. G. COFFMAN E. N. GILBERT P. A. WHITING P. M. WINKLER Bell Laboratories Lucent Technologies P.O. Box 636 Murray Hill NJ 07974 USA Also with: CWI P.O. Box 94079 1090 GB Amsterdam The Netherlands Current affiliation: Columbia University New York NY 10027

To improve efficiency, we allow a carrier in a TDMA (Time Division Multiple Access) network to be shared by adjacent cells. This sharing of time slots is seriously hampered by the lack of synchronization in distinct cells. We study packing algorithms that overcome this obstacle by clustering calls. The results suggest that even simple greedy algorithms are nearly optimal, and that little extra performance can be gained either by allowing the rejection of calls or by repacking.

关键词： Carrier sharing dynamic channel allocation mobile communications packing algorithm TDMA wireless networks time slot allocation

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Empirical quantitative characterization of holographic phase images of normal and abnormal cervical cells by fractal descriptors

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COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING-IMAGING AND VISUALIZATION 2018年第4期6卷 386-395页

作者： Mihailescu, Mona Scarlat, Eugen I. Paun, Irina Alexandra Grigorescu, Irina Radu, Roxana Nedelcu, Oana Tatiana Univ Politehn Bucuresti Appl Sci Phys Dept Bucharest Romania Univ Politehn Bucuresti Comp Sci & Informat Technol Dept Bucharest Romania LOTUS Hosp SRL Ploiesti Romania Natl Inst Res & Dev Microtechnol Bucharest Romania

The paper proposes a way to examine whether cervical cells qualify as normal or abnormal on the basis of phase profiles,and to subsequently perform local fractal descriptions of their three dimensional holographic images. The method is an alternative tool to discriminate among normal and abnormal cervical cells by exploiting the whole image of the cell not only limited zones like random cross sections. The empirical findings indicate correlation between cross sectional phase profile and fractal characterisation. The results are useful for developing cell counting algorithms based on Bayesian programming.

关键词： Digital holographic microscopy fractal descriptors cell discrimination packing algorithm cervical cells quantitative phase imaging

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An Improved Variable-width Spectrum Allocating algorithm for Multi-radio WMNs

An Improved Variable-width Spectrum Allocating Algorithm for...

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2011 International Conference on Intelligent Computing and Integrated Systems(ICISS 2011)

作者： Xiao-yan Zhou, Ting-lei Huang, Pin Liu, Gong-xing Wu School of Computer Science and Engineering Guilin University of Electronic Technology Guilin, China

A multi-radio wireless mesh network has the potential to provide higher throughput and a variable-width spectrum allocating strategy can bring this potential into play. This paper presents an improved packing algorithm base on interference condition in the wireless communication model and the characters of wireless mesh networks. Due to the fact that interference range varies with its channel width, our aim is to minimize the interference between nodes. We construct a looser structure to allocate spectrum to nodes and their neighboring nodes so that changed interference range of each nodes will result in less interference or even no interference.

关键词： variable-width spectrum allocation packing algorithm interference WMNs

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CELLmicrocosmos 2.2: advancements and applications in modeling of three-dimensional PDB membranes

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Journal of Cheminformatics 2010年第1期2卷 1-1页

作者： Björn Sommer T Dingersen S Rubert C Gamroth S Schneider University of Bielefeld Universitätsstraße 25 33615 Bielefeld Germany D-85748 Garching Germany

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