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Dynamical energy equipartition of the Toda model with additional on-site potentials

Chinese Physics B 2017年第10期26卷 107-111页

作者：张振俊唐春梅康静童培庆 College of Science Hohai University School of Physics and Technology Nanjing Normal University Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University

We study the dynamical energy equipartition properties in the integrable Toda model with additional uniform or disordered on-site energies by extensive numerical simulations. The total energy is initially equidistributed among some of the lowest frequency linear modes. For the Toda model with uniform on-site potentials, the energy spectrum keeps its profile nearly unchanged in a relatively short time scale. On a much longer time scale, the energies of tail modes increase slowly with time. Energy equipartition is far away from being attached in our studied time scale. For the Toda model with disordered on-site potentials, the energy transfers continuously to the high frequency modes and eventually towards energy equipartition. We further perform a systematic study of the equipartition time teq depending on the energy density ε and the nonlinear parameter α in the thermodynamic limit for the Toda model with disordered on-site potentials. We find teq∝ （1/ε）^a（1/α）^b, where b≈ 2a. The values of a and b are increased when increasing the strengths of disordered on-site potentials or decreasing the number of initially excited modes.

关键词： energy transport behaviors Toda model uniform or disordered on-site potentials

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LPI radar signal detection based on radial integration of Choi-Williams time-frequency image

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Journal of systems science & complexity 2015年第5期28卷 973-981页

作者： Yongjian Liu Peng Xiao Hongchao Wu Weihua Xiao Science and Technology on Complex Aviation Systems Simulation Laboratory Aviation University of Air Force

This paper mainly revolves the time-frequency image of low probability of intercept(LPI) radar signals and carries out research work on image features selection and extraction and recognition. Since Choi-Williams distribution(CWD) uses the exponential kernel of bilinear generalized class of time-frequency distribution, it has an excellent time-frequency aggregation. And it is suitable for detecting LPI radar signals in a low signal-to-noise ratio(SNR) condition. A radial integration method based on the integral rotating factor is proposed to detect LPI radar signals when the signals' time-frequency image is obtained. First, the digital image processing method is used to preprocess the LPI radar signals' time-frequency images after CWD transformation; then, the radial integration method based on the integral rotating factor is used to detect LPI radar signals in the binary images. The analytic results of real data show that the method has a good performance on detecting LPI radar signals in a low SNR condition. Additionally,the method is simple and takes less logic resources and has the potential of real-time detection of LPI radar signals.

关键词： low probability of intercept （LPI） integral rotating fac-tor signal detection image processing

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Study on the effectiveness equivalent of army weapons based on the sos simulation

Study on the effectiveness equivalent of army weapons based ...

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International Conference on Control Engineering and Information System, ICCEIS 2014

作者： Zhao, Z.Q. Zhang, X.Z. Science and Technology on Composite Land Systems Simulation Laboratory Beijing China College of Mechaeronics Engineering and Automation National University of Defense Technology Changsha Hunan China Science and Technology on Composite Land Systems Simulation Laboratory Beijing China

ISBN: (纸本)9781138026858

Under the background of the system of systems (Sos) confrontation of army weapon, owing to being enclosed in the sealed fighting subsystem, and the effectiveness matrix is degrading, so the effectiveness equivalent on the varieties of the weapon in the system of systems cannot be conducted for many years as a difficult problem in the field of assessment on the effectiveness of weapon systems. The principle of multiple effectiveness equivalent aiming at expanding the traditional effectiveness equivalent theory was presented, filling in gap existing in the original theory, and satisfactorily realized the effectiveness equivalent of varieties of main weapon systems in army’s weapon system of systems, which is an important breakthrough and innovation in the study on assessment of effectiveness of weapon systems, enjoying broad utilization prospect. © 2015 Taylor & Francis Group, London.

关键词： System of systems

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Study on methods based on Sobol indices method for analyzing sensitivity of army equipment effectiveness

Study on methods based on Sobol indices method for analyzing...

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2014 International Conference on simulation and Modeling Methodologies, Technologies and Applications, SMTA 2014

作者： Zhao, Zhiqiang Wang, Zhigang Yi, Liu Science and Technology on Complex land Systems Simulation Laboratory Beijing China College of Mechaeronics Engineering and Automation National University of Defense Technology Changsha Hunan China

ISBN: (纸本)9781845649821

Sensitivity analysis on weapons and equipment is the foundation for determining the priorities of development and construction of army weapons and equipment, constitutes the important contents of system optimization. In this paper, the applicability Sobol index method in the analysis of sensitivity of army equipment system effectiveness was explained, the model of Sobol index method theory was established, examples of sensitivity of army equipment system effectiveness was offered, and the applicability of this method was described through the comparisons of several common sensitivity indexes and the sensitivity index in Sobol index method. © 2014 WIT Press.

关键词： Sensitivity analysis

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An analysis method for contribution degree of C4ISR system based on operational effectiveness

An analysis method for contribution degree of C4ISR system b...

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IASTED International Conference on Modelling and simulation, MS 2012

作者： Yu, Qin-Zhang Zhang, Ying-Chao Hu, Run-Tao Shen, Zhi-Ming Zhang, Jing Beijing Institute of System Engineering Science and Technology on Complex Systems Simulation Laboratory Beijing China

ISBN: (纸本)9780889869264

C4ISR system is the multiplicator of System of Armament systems (SoAS). An analysis method for Contribution Degree of C4ISR system is proposed in the paper. Firstly, Overall-Effect based evaluation method for operational effectiveness of SoAS is introduced. Secondly, Contribution Degree of C4ISR system is defined and experiment flow based on exploratory simulation is designed. On this basis, an analysis method for Contribution Degree of C4ISR system is put forward. Finally, a simulation experiment is executed to prove the effectiveness of the method.

关键词： C4ISR system Contribution Degree Analysis Method Operational Effectiveness Multiplying circuits simulation test evaluation method armament WWOX gene

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System of systems complexity and decision making

System of systems complexity and decision making

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2012 7th International Conference on System of systems Engineering, SoSE 2012

作者： Zhang, Yingchao Beijing Institute of System Engineering Science and Technology on Complex Systems Simulation Laboratory Beijing China

ISBN: (纸本)9781467329750

complexity in System of systems (SoS) is a key factor in SoS decision making. This paper analyzes the main characteristics of SoS, especially its complexity in terms of monolithic emergence, component systems adaption and uncertainty in SoS evolution. It further discusses the effects of SoS complexity on SoS decision making. In light of SoS complexity, the paper figures out the major problems that need to be addressed in four areas, namely SoS adaption, abnormity analysis in SoS evolution, exploratory analysis of SoS capability and SoS simulation. In conclusion the paper proposes a preliminary SoS decision making model based on the analysis of SoS adaption. © 2012 IEEE.

关键词： System of systems

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Architecture transformation research on joint border defense systems-of-systems 2021

Architecture transformation research on joint border defense...

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2021 5th International Conference on Management Engineering, Software Engineering and Service sciences, ICMSS 2021

作者： Zhang, Mengmeng Yi, Shuanghui Lin, Menglong Chen, Honghui Science and Technology on Information Systems Engineering Laboratory China National Key Laboratory for Complex System Simulation China

ISBN: (纸本)9781450389709

Currently, with the deepening of development and open of China's border, issues of border joint defense become increasingly arduous. Traditional means of cooperation and coordination are far from being able to align requirements;information systems of different joint defense units are difficult to interconnect and interoperate;the previous results of joint defense informatization are difficult to inherit. The main reason is the lack of border joint defense information construction with a top-level design approach. Via the lens of top-level design, this paper establishes a multi-viewpoint architecture framework and transformation process, develops the as-is and to-be joint defense architecture, and finally analyzes transformation principles from the as-is architecture to to-be architecture. This paper mainly explores the architecture transformation mechanisms under the border joint defense scenario. © 2021 ACM.

关键词： Architecture

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Study of application of reciprocal scale in quantitative analysis

Study of application of reciprocal scale in quantitative ana...

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5th International Conference on Applied Mathematics, simulation, Modelling, ASM'11

作者： Bai, Hanbin Wei, Jicai Complex Systems Simulation in the Science and Technology Complex Systems Simulation Laboratory Beijing Institute of System Engineer Post BOX. 9702#19 Beijing 100101 China

ISBN: (纸本)9781618040169

Focused on scale problems, this study demonstrated the importance of scale system selection, and necessity of scale system evaluation. The mutually exclusivity of complete consistency under different scale systems has been proved using mathematical contradiction method, and conclusions with practical significances has been obtained through experimental method in this study that the exponential scale is more reasonable than other scales in reciprocal scale system. Although there are some errors exist in the method used by this study, there are also certain practical significances for the analysis that how to increase the accuracy of AHP method.

关键词： Hierarchical systems

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Investigation of multiple-attribute decision making model based on uncertainty

Investigation of multiple-attribute decision making model ba...

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5th International Conference on Applied Mathematics, simulation, Modelling, ASM'11

ISBN: (纸本)9781618040169

There are many uncertainties in multiple-attribute decision making problems so that the reliability and correctness of decision making results depend on the scientifically and reasonably confirmation of attribute weights. Combination assigning method based on optimal eigenvectors which uses multi-objective optimization to integrate subjective and objective weightings was presented in the study so that the limitations of both subjective assigning method and objective assigning method have been overcome. Furthermore, decision making model based on TOPSIS method was also established to obtain more reasonable and scientific method of weightings confirmation method for multi-attribute decision making problems.

关键词： Multiobjective optimization

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Research on Chi-square Distribution-based Firing Accuracy Data Analysis

Research on Chi-square Distribution-based Firing Accuracy Da...

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2015 International Conference on Advances in Mechanical Engineering and Industrial Informatics(AMEII 2015)

作者： Zhiqiang Zhao Bo Chuan Jiang Jingang Zhang Science and Technology on Complex land Systems Simulation Laboratory

ISBN: (纸本)9781510806481

In the test and evaluation of operation, the test benefits may be greatly reduced because no useful conclusions may be obtained from test data due to missing or incompleteness of test information records. Based on the characteristics of gun firing and by separating firing errors, this paper proposes an idea using for analyzing firing accuracy in case of incomplete test data records, establishes a method for analyzing chi-square distribution-based firing accuracy data, and conducts test data analysis on test data of a certain type of weapon. The effectiveness of this method is proven by analysis results which have offered effective method for conducting test data analysis.

关键词： Operational Test firing accuracy elements error dispersion error chi-square distribution confidence degree

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