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Design and implementation of centralized and distributed self-adaption of simulation system framework

International Journal of Simulation: Systems, Science and Technology 2016年第44期17卷 7.1-7.7页

作者： Gong, Jianxing Kong, Jiangtao Hao, Jianguo Huang, Jian College of Mechatronics Engineering and Automation National University of Defense Technology Changsha410073 China

Firstly, the integration techniques of simulation systems, such as component-based, middleware-based and bridgedesign mode and so on, have been introduced in this paper. Then, based on these, a common simulation system framework has been designed on the view of software architecture, which enables the simulation system based on the simulation system framework to run on the distribution mode and the centralized mode. Moreover, based on the two running mode, the simulation system could use the same modeling specification, the unified protocol of data interoperation and integrative simulation running infrastructure. Lastly, according to the above design idea, this thesis has put forward the implementation process of key software modules, application modes and the work flow, which simulation model components and simulation running infrastructure based on the simulation system framework would meet the requirement of self-adaption of distribution mode and the centralized mode so that it has improved the reusing and interoperability of resources of simulation system. © 2016, UK Simulation Society. All rights reserved.

关键词： Middleware

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Nanometer precision fabrication for optical surfaces 16

Nanometer precision fabrication for optical surfaces

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16th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2016

作者： Peng, Xiaoqiang Dai, Yifan Li, Shengyi Shi, Feng Zhou, Lin Song, Ci Yang, Can College of Mechatronics Engineering and Automation National University of Defense Technology Changsha410073 China Hu'nan Key Laboratory of Ultra-precision Machining Technology Changsha410073 China

ISBN: (纸本)9780956679086

The fast development of technology results in increasing demands on nano-precision optical surfaces in fields of lithography, synchrotron radiation, space observation and inertial confinement fusion (ICF). As the requirements on equipments performance are continuously rising, the surface accuracy and roughness of optical components need to be further improved, which almost hit the theoretical physical limit. The highly increased demands not only bring tough challenges for optics fabrication, but make it the frontier in the nano-precision fabrication area. Through the development of conventional polishing and computer controlled small tool polishing technique, the technology of optical manufacturing has evolved to controllable compliant tools polishing, which is represented by Magnetorheological polishing (MRF) and Ion Beam Figuring (IBF). The polishing tools of these latest developed techniques could be controlled flexibly, which enhances the manufacturing adaptability to aspheric surface curvature and the long- Term stability of removal function. By utilizing the self-innovated controllable flexible polishing technology and facilities, National University of Defense Technology has realized nano-precision fabrication of typical optical surfaces and provided strong support in manufacturing technology to national science and technology projects.

关键词： Inertial confinement fusion

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Design and simulation of liquid cooled system for power battery of PHEV

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IOP Conference Series: Materials Science and engineering 2017年第1期231卷

作者： Jianpeng Wang Haijun Xu Xiaojun Xu Cunyun Pan College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

Various battery chemistries have different responses to failure, but the most common failure mode of a cell under abusive conditions is the generation of heat and gas. To prevent battery thermal abuse, a battery thermal management system is essential. An excellent design of battery thermal management system can ensure that the battery is working at a suitable temperature and keeps the battery temperature diffenence at 2-3 °C. This paper presents a thermal-elcetric coupling model for a 37Ah lithium battery using AMESim. A liquid cooled system of hybrid electric vehicle power battery is designed to control the battery temperature.A liquid cooled model of thermal management system is built using AMESim, the simulation results showed that the temperature difference within 3°C of cell in the pack.

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The quadruped robot adaptive control in trotting gait walking on slopes

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AIP Conference Proceedings 2017年第1期1890卷

作者： Shulong Zhang Hongxu Ma Yu Yang Jian Wang College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

The quadruped robot can be decomposed into a planar seven-link closed kinematic chain in the direction of supporting line and a linear inverted pendulum in normal direction of supporting line. The ground slope can be estimated by using the body attitude information and supporting legs length. The slope degree is used in feedback, to achieve the point of quadruped robot adaptive control walking on slopes. The simulation results verify that the quadruped robot can achieves steady locomotion on the slope with the control strategy proposed in this passage.

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A parallel optimization method for product configuration and supplier selection based on interval

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IOP Conference Series: Materials Science and engineering 2017年第1期207卷

作者： Jian Zheng Meng Zhang Guoxi Li College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China

In the process of design and manufacturing, product configuration is an important way of product development, and supplier selection is an essential component of supply chain management. To reduce the risk of procurement and maximize the profits of enterprises, this study proposes to combine the product configuration and supplier selection, and express the multiple uncertainties as interval numbers. An integrated optimization model of interval product configuration and supplier selection was established, and NSGA-II was put forward to locate the Pareto-optimal solutions to the interval multiobjective optimization model.

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Fractional order robust visual servoing control of a quadrotor UAV with larger sampling period

Fractional order robust visual servoing control of a quadrot...

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2016 International Conference on Unmanned Aircraft Systems, ICUAS 2016

作者： Shang, Bo Liu, Jianxin Zhao, Tiebiao Chen, Yangquan Q. College of Information Science and Engineering Northeastern University Shenyang China School of Mechanical Engineering Xihua University Chengdu Sichuan China Mechatronics Embedded Systems and Automation Lab University of California MercedCA95343 United States

ISBN: (纸本)9781467393331

Unmanned aerial vehicles (UAVs) are widely applied in both civil and military fields, such as rescue, surveillance, exploration, navigation, precision agriculture and etc., because of small size, low cost and easy maintenance. However the autonomous flight of UAVs under unstructured environment is still open, especially when GPS is unavailable or indoor task is scheduled. Furthermore, GPS-based navigation accuracy needs to be improved. To deal with these limitations, in this paper, we provide an engineering-oriented solution of precise hovering based on visual servoing and fractional order proportional-integral-derivative (PID) controller without GPS information. First, the mathematical speed model of a quadcopter is obtained by step response experiments. Then, fractional order PID controller algorithm is designed to improve its hovering accuracy and robustness. In our work, the position reference is extracted with an on-board color based target recognition algorithm instead of GPS. Both simulation and field experimental results demonstrate that the proposed scheme can achieve a better performance in terms of hovering accuracy and robustness to disturbances. In particular, for the first time, we show that, the sampling period can be bigger than usual when using fractional order control algorithm, relaxing costly hardware requirement for fast real-time vision-based feedback. © 2016 IEEE.

关键词： Controllers

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Vertical signal feedthrough for sandwich devices based on anodic bonding and after laser trimming

Vertical signal feedthrough for sandwich devices based on an...

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2016 IEEE International Symposium on Inertial Sensors and Systems

作者： Xinghua Wang Qiang Xu Dingbang Xiao Zhanqiang Hou Zhihua Chen Xuezhong Wu College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

This paper reports a novel, low-cost and inherently simple vertical signal transmission method for glass-silicon-glass sandwich micro-electro-mechanical systems (MEMS) gyroscopes based on heavily doped silicon-bridge. As for the fabrication technique, only glass-to-silicon anodic bonding and after-laser-trimming process are needed, which are fully compatible with standard MEMS technology. Micro gyroscopes based on this optimized strategy were fabricated and experimental results showed that the proposed strategy for vertical signal transmission could be successfully integrated with MEMS devices and potentially be used in wafer level hermetic sealing.

关键词： Micromechanical devices Gyroscopes Substrates Silicon Glass Capacitance Bonding

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Least-squares estimation for linear models with certain ranges

Least-squares estimation for linear models with certain rang...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Chao Zhou Yueke Wang Chunjie Qiao Weihua Dai College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (纸本)9781509040940

As a signal processing method, the least-squares method plays a crucial role in parameter estimation, and great progress has been made in recent decades. However, errors may occur when the parameters to be estimated have some actual physical meaning, e.g., if the human-body temperature is estimated to be 70 °C by a general least-squares method. In this study, we consider solving a particular problem, named ranged least-squares estimation (RLSE), where the parameters are restricted to certain meaningful ranges. By using a theoretical analysis, we prove that the solution of the RLSE problem is unique and can be obtained in finite number of steps when the system matrix has a full column rank. Two programmable algorithms are proposed: a basic algorithm and another with improved efficiency. We also present a numerical experiment of an actual RLSE problem for hydrological parameter estimation, which validates the proposed method.

关键词： Algorithm design and analysis Estimation Parameter estimation Upper bound Signal processing algorithms Convex functions

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Application of SVM in Object Tracking Based on Laplacian Kernel Function

Application of SVM in Object Tracking Based on Laplacian Ker...

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International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC

作者： Yaohui Wang Jiyang Zhang College of Mechatronics Engineering and Automation Nation University of Defense Technology Changsha China

ISBN: (纸本)9781509007691

In the process of object tracking, because of the light, the angle of view as well as the target shape change causes the goal which is easy to lose. In this paper, we use the SVM based on Laplacian Kernel Function. Under the framework of Struck, it is applied to the object tracking, and comparing with other kernel functions, such as Linear Kernel Function, Gauss Kernel Function and so on, which can achieve the object tracking with high accuracy and stability.

关键词： Kernel Support vector machines Target tracking Object tracking Optimization Training Laplace equations

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Sample capacity for autonomous underwater vehicle range accreditation

Sample capacity for autonomous underwater vehicle range accr...

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IEEE International Conference on Big Data Analysis (ICBDA)

作者： Xiaojun Guo Shaojing Su Zhiping Huang Yimeng Zhang Chunwu Liu College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (纸本)9781467395922

In this paper we are interested in the hypothesis test (HT) solution in the presence of prior information and conjugated prior distribution. Truncated Bayesian sequential posterior odd test (SPOT) is introduced to predict the required test sample size in autonomous underwater vehicle (AUV) range accreditation. We focus on the connection between risks (type I and type II) and truncated threshold, required test sample size. And the computational approach based on numerical approaching is given in steps. Supported by prior information after fusion on credibility, we deeply analyzed the effect of risk base value on SPOT performance, and an array of random bootstrapping data is generated to validate the conclusion. A mature solution to small-size-sample test accreditation is proposed in this paper, which provides vital suggestions for test sample size prediction in small-size-sample parameter hypothesis test.

关键词： Bayes methods Accreditation Gaussian distribution Upper bound Underwater vehicles Sociology Statistics

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