检索结果-内蒙古大学图书馆

New Theory and algorithm of Optimal Control Based on Natural Computation 11

New Theory and Algorithm of Optimal Control Based on Natural...

11th International Conference on Natural Computation (ICNC) / 12th International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Yang, Yi Nan, Ying Chen, Haoxiang Nanjing Univ Aeronaut & Astronaut Coll Astronaut Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781467376792

This paper presents a new theory and algorithm regarding on optimal control based on natural computation. This natural algorithm simulates the survival and competition of multi-races and multi-individuals in the astrospace which consists of all races and individuals. This super-intelligent natural algorithm covers most of current optimization algorithms for dynamic and static parameters, and is applicable to a variety of fields and disciplines. In the natural running process, all races and individuals can compete for its own interests, and the final results must be optimal for the overall situation. Some numerical simulation results show that this new theory and algorithm of optimal control are correct and feasible, as well as superior for the multilateral confrontations problem.

关键词： nature computation natural running optimal control global integrative optimization numerical algorithm multilateral confrontations

来源：评论

学校读者我要写书评

暂无评论

Experimental determination of the elastic-viscous characteristics of elastic ropes 7

Experimental determination of the elastic-viscous characteri...

引用

7th Scientific-Technical Conference Material Problems in Civil Engineering (MATBUD)

作者： Pavlov, Peter Evlogiev, Daniel Univ Architecture Civil Engn & Geodesy Sofia 1046 Bulgaria

The conducted analytical, numerical and experimental studies for waiving of the elastic-viscous characteristics of elastic ropes are presented in the current report. The analytical studies are related to the creation of a dynamic and mathematical model of a vibrating system, supported by such ropes. The numerical studies refer to the creation of a corresponding program and a simulation model. The experimental activities refer to the modification of an existing dynamic stand for the implementation of an experimental setting, corresponding to the initial dynamic model. Additional numerical activities are carried out in connection with the development of a programming module for receiving, processing and analysis of the results of the experimental studies. By applying of the combined procedure, the data for the resistance of randomly selected group of ropes, at different deformation in them, are received. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://***/lienses/by-nc-nd/4.0). Peer-review under responsibility of organizing committee of the 7th Scientific-Technical Conference Material Problems in Civil Engineering

关键词： elastic ropes dynamic model numerical algorithm experimental set elastic-viscous characteristics

来源：评论

学校读者我要写书评

暂无评论

Cholesky Factorization on Heterogeneous CPU and GPU Systems 9

Cholesky Factorization on Heterogeneous CPU and GPU Systems

引用

9th International Conference on Frontier of Computer Science and Technology

作者： Chen, Jieyang Chen, Zizhong Univ Calif Riverside Dept Comp Sci Riverside CA 92521 USA

ISBN: (纸本)9781467392952

General-purpose graphics processing units (GPGPUs) could bring huge performance improvements in scientific and numerical fields. We presented two approaches utilizing hybrid CPU/GPU system in Cholesky factorization. First, we analyzed the implementation of Cholesky factorization in MAGMA and identified the bottleneck of the current implementation, which is the use of fixed block size without considering any factors in the computing environment. So, we designed an algorithm, which could determine the optimal block size of Cholesky factorization based on multiple factors (input matrix size, CPU/GPU performance, and CPU/GPU bandwidth, etc.). Then, we presented a new improvement on MAGMA's implementation utilize the algorithm. Test results showed that our approach is more efficient than MAGMA's fixed block size implementation under some circumstance. After combining our implementation with MAGMA's implementation, the new hybrid implementation could outperform the current MAGMA implementation. Second, we identified that all the implementations of Cholesky factorization, to our best knowledge, that utilized the GPU do not fully utilized the multicore CPU. So, after studied other researchers approaches, we designed a new algorithm that could utilize multicore CPU and GPU simultaneously in Cholesky factorization. Our approach could keep the block size and workload distribution between CPU and GPU dynamically. Testing results showed the optimal data distribution ratio for our current implementation.

关键词： numerical algorithm Parallel algorithm Multicore GPU Cholesky Factorization

来源：评论

学校读者我要写书评

暂无评论

Reaction Control System using Hybrid Micro-Thrusters, Theoretical and Experimental Results 7

Reaction Control System using Hybrid Micro-Thrusters, Theore...

引用

7th International Conference on Recent Advances in Space Technologies (RAST)

作者： Chelaru, Teodor-Viorel Chelaru, Adrian Enache, Vasile Univ Politehn Bucuresti Res Ctr Aeronaut & Space Ghe Polizu 1 Bucharest Romania INCAS Natl Inst Aerosp Res Elie Carafoli Bucharest 061126 Romania SC Electromecania Ploiesti SA Ploiesti Romania

ISBN: (纸本)9781479976973

This paper develop a calculus model based on dedicated experiment for an innovative Reaction Control System (RCS) using hybrid rocket engine technology. Our RCS uses several hybrid micro-thrusters with their thrust modulated by a separate control system. For RCS, each of the thrusters is able to burn a few minutes and its thrust is modulated within certain limits by controlling the oxidizer flow. These studies were presented in RAST 2013 and are based on our own experiments performed in Electromecanica Ploiesti. Based on this concept we achieve a calculation of the performances of the RCS and make a comparison between theoretical and experimental results. Conclusions and discussions will be focused on technological possibilities to improve RCS performance and possible areas of application of it.

关键词： reaction control system hybrid rocket motor nozzle vehicle numerical algorithm computation model combustion

来源：评论

学校读者我要写书评

暂无评论

A Joint Optimization Method of Genetic algorithm and numerical algorithm Based on MATLAB

A Joint Optimization Method of Genetic Algorithm and Numeric...

引用

5th IEEE Conference on Industrial Electronics and Applications

作者： Zhang, Jingjun Zhong, Jitao Gao, Ruizhen He, Lili Hebei Univ Engn Dept Sci Res Coll Civil Engn Coll Mech & Elect Engn Handan Peoples R China

ISBN: (纸本)9781424450466

The mathematic model of a two-bar truss is built in MATLAB and the analysis is carried out by the genetic algorithm toolbox. In order to compare with each other, the parametric model of the planar truss is also established by the ANSYS Parametric Design Language and solutions are obtained using the first-order method native to ANSYS. The comparison of the results shows that genetic algorithms do not always display better properties than other algorithms for some problems. Finally, a joint optimization method which combines MATLAB genetic algorithm toolbox and the numerical algorithm based on the quasi-Newton method is proposed. Then the method is identified through the numerical example of the two-bar truss. The simulation results indicate that the joint optimization method can always converge to the global optimal solution.

关键词： genetic algorithm numerical algorithm optimization MATLAB ANSYS

来源：评论

学校读者我要写书评

暂无评论

Application of the Maximum Entropy Method for Determining a Sensitive Distribution in the Renewable Energy Systems

引用

JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME 2015年第4期137卷 042006-042006页

作者： Yari, Gholamhossein Farsani, Zahra Amini Iran Univ Sci & Technol Sch Math Tehran *** Iran

In the field of the wind energy conversion, a precise determination of the probability distribution of wind speed guarantees an efficient use of the wind energy and enhances the position of wind energy against other forms of energy. The present study thus proposes utilizing an accurate numerical-probabilistic algorithm which is the combination of the Newton's technique and the maximum entropy (ME) method to determine an important distribution in the renewable energy systems, namely the hyper Rayleigh distribution (HRD) which belongs to the family of Weibull distribution. The HRD is mainly used to model the wind speed and the variations of the solar irradiance level with a negligible error. The purpose of this research is to find the unique solution to an optimization problem which occurs when maximizing Shannon's entropy. To confirm the accuracy and efficiency of our algorithm, we used the long-term data for the average daily wind speed in Toyokawa for 12 yr to examine the Rayleigh distribution (RD). This data set was obtained from the National Climatic Data Center (NCDC) in Japan. It seems that the RD is more closely fitted to the data. In addition, we presented different simulation studies to check the reliability of the proposed algorithm.

关键词： hyper Rayleigh distribution Lagrange multipliers maximum copula maximum entropy method numerical algorithm renewable energy systems wind speed probability distribution

来源：评论

学校读者我要写书评

暂无评论

Experimental Determination of the Elastic-Viscous Characteristics of Elastic Ropes

引用

Procedia Engineering 2015年 108卷 488-495页

作者： Peter Pavlov Daniel Evlogiev Universiry of Architecture Civil Engineering and Geodesy 1 Hr. Smirnenski Blvd Sofia 1046 Bulgaria

关键词： elastic ropes dynamic model numerical algorithm experimental set elastic-viscous characteristics

来源：评论

学校读者我要写书评

暂无评论

Research on a Specific Harmonic Elimination Technique for Step Wave of Cascade Type H Bridge Converters

Research on a Specific Harmonic Elimination Technique for St...

引用

2015 5th International Conference on Computer Sciences and Automation Engineering(ICCSAE 2015)

作者： Anqi Li Department of Electrical Engineering North China Electric Power University

With the rapid development of power electronic technology, power electronic equipments with inverter devices as the main circuit structure are widely used, producing numerous harmonics and having a harmful effect on power grids and electricity equipments. This paper uses the improved genetic algorithm model and least square optimization model to calculate the switch angle when specific harmonic is eliminated and put forward the auxiliary control strategy to achieve power balance in each H bridge converter unit in a certain period.

关键词： selective harmonic elimination the improved genetic algorithm least squares optimization 0-1 planning numerical algorithm

来源：评论

学校读者我要写书评

暂无评论

Dynamic thermo-mechanical coupled response of random particulate composites:A statistical two-scale method

引用

Chinese Physics B 2014年第7期23卷 605-616页

作者：杨自豪陈云杨志强马强 Department of Applied Mathematics Northwestern Polytechnical University College of Computer Science Fujian Agriculture and Forestry University LSEC ICMSECAcademy of Mathematics and Systems ScienceChinese Academy of Sciences

This paper focuses on the dynamic thermo-mechanical coupled response of random particulate composite materials. Both the inertia term and coupling term are considered in the dynamic coupled problem. The formulation of the problem by a statistical second-order two-scale （SSOTS） analysis method and the algorithm procedure based on the finite-element difference method are presented. numerical results of coupled cases are compared with those of uncoupled cases. It shows that the coupling effects on temperature, thermal flux, displacement, and stresses are very distinct, and the micro- characteristics of particles affect the coupling effect of the random composites. Furthermore, the coupling effect causes a lag in the variations of temperature, thermal flux, displacement, and stresses.

关键词： random particulate composites statistical second-order two-scale （SSOTS） analysis method,thermo-mechanical coupling effect numerical algorithm

来源：评论

学校读者我要写书评

暂无评论

Complex Integral Method For Computing Hypersingular Integrals And Error Estimation

Complex Integral Method For Computing Hypersingular Integral...

引用

The 5th Asia-Pacific International Conference on Computational Methods in Engineering and the 11th Chinese National Conference on Computational Methods in Engineering(ICOME 2015)

作者： Yiming Chen Xuan Li Xuedao Shu Guangxian Shen College of Science Yanshan University Mechanical Engineering and Mechanics Ningbo University College of Mechanical Engineering Yanshan University

In this paper, the complex integral method is firstly put forward to compute hypersingular integrals on interval. Based on the classical Cauchy integral formula, the integral paths of hypersingular integrals is moved to the complex plane from the real axis so that there is no singular points in the new integral paths, and then the computational formulas of the exact value of hypersingular integrals is obtained. At the same time, the numerical algorithm of complex integral and error estimation are derived. numerical examples are provided to show that the method is computationally efficient.

关键词： Hypersingular Integrals Complex Integrals Error Estimation numerical algorithm

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：