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Zhu X.,Dalian University of Technology | Gao J.,Shandong University of Science and Technology | Feng E.,Dalian University of Technology | Xiu Z.,Dalian University of Technology | Jin S.,Troop
Biotechnology and Applied Biochemistry | Year: 2013

In this paper, stability analysis and controller design in microbial continuous culture with discrete time delay are studied. The dissimilation process of glycerol to 1,3-propanediol cannot avoid the disturbances caused by time delay. Time delay can limit and degrade the achievable performance of controlled systems, and even induce instability. Based on the biodynamic model, some properties of its solutions are discussed. In addition, we investigate how the time-delay affects the stability of the system. A linear matrix inequalities method is applied to find a feedback controller to ensure the stability of the closed-loop system. The simulation results indicate that this controller might be feasible for continuous bioprocess control. © 2013 International Union of Biochemistry and Molecular Biology, Inc.


Wang J.,Jilin University | Yang Z.,Jilin University | Liu S.,Jilin University | Zhang Q.,Jilin University | Han Y.,Troop
Advances in Mechanical Engineering | Year: 2016

With the increasing attention of energy saving and emission reduction technology, the recent application of hybrid powertrain technology affects the development of construction machinery industry. This article reviews these publications and provides comprehensive references. This article reviews the state-of-art for the hybrid wheel loader and excavator, which focuses on powertrain configuration, energy storage devices, and energy management strategies. The basis of classification and characteristic of each powertrain configuration are described. Advantages and disadvantages of batteries, supercapacitors, hydraulic accumulators, and flywheel used in hybrid construction machinery are summarized. The existing energy management strategies for hybrid construction machinery are also elaborated. The technological challenges and developing trends in the near future for hybrid construction machinery are discussed. © SAGE Publications Ltd, unless otherwise noted. Manuscript content on this site is licensed under Creative Commons Licenses.


Li Z.,PLA University of Science and Technology | Wang H.,PLA University of Science and Technology | Dong C.,PLA University of Science and Technology | Qian R.,Troop
IEEE Wireless Communications and Networking Conference, WCNC | Year: 2013

Wireless mesh networks (WMNs) are taking advantage of multiple radio interfaces to improve network performance, and numerous routing protocols have been proposed for WMNs. However, these routing protocols can not perform well in the heterogeneous multi-radio environment with distinct bandwidth difference, for little attention has been paid to routing overhead balancing. To address this issue, we present a routing protocol called URP (unified routing protocol) which cooperates with distinct bandwidth difference and makes appropriate use of networks to achieve the best performance. In WMNs, a large number of routing messages spread in different channels are duplicated, considering this nodes running URP select a high bandwidth channel set to forward routing messages rather than broadcasting them in each channel. On the one hand, this helps reduce the routing overhead and economize the resource of low bandwidth channels. On the other hand, the low bandwidth channels can contribute their limited resource to improving the throughput. In addition, an advanced expected transmission time (ETT) estimation method accounting for node mobility is implemented in URP, it helps URP considers both the variation of link quality and channel bandwidth to select a route. Simulations show that URP considerably reduces the routing overhead by 25% in heterogeneous WMNs with distinct bandwidth difference compared with OLSR. Moreover, the reduced resource consumption and the advanced ETT estimation method help improve the network throughput. © 2013 IEEE.


Zhang W.,Baoji University of Arts And Sciences | Ma H.,Shaanxi University of Technology | Zhang J.,Baoji University of Arts And Sciences | Chen L.,troop | Qu Y.,Baoji University of Arts And Sciences
Journal of Power Electronics | Year: 2015

This study investigates the multi-objective fuzzy optimization of crowbar resistance for the doubly fed induction generator (DFIG) low-voltage ride-through (LVRT). By integrating the crowbar resistance of the crowbar circuit as a decision variable, a multi-objective model for crowbar resistance value optimization has been established to minimize rotor overcurrent and to simultaneously reduce the DFIG reactive power absorbed from the grid during the process of LVRT. A multi-objective genetic algorithm (MOGA) is applied to solve this optimization problem. In the proposed GA, the value of the crowbar resistance is represented by floating-point numbers in the GA population. The MOGA emphasizes the non-dominated solutions and simultaneously maintains diversity in the non-dominated solutions. A fuzzy-set-theory-based is employed to obtain the best solution. The proposed approach has been evaluated on a 3 MW DFIG LVRT. Simulation results show the effectiveness of the proposed approach for solving the crowbar resistance multi-objective optimization problem in the DFIG LVRT. © 2015 KIPE.


Wang N.,Troop | Wang N.,Post Doctoral Scientific Research Workstation | Song Z.G.,Troop | Song Z.G.,Post Doctoral Scientific Research Workstation
Advances in Energy, Environment and Materials Science - Proceedings of the International Conference on Energy, Environment and Materials Science, EEMS 2015 | Year: 2016

The frequency hopping transmission station model overall construction technique and the principle of its main module design were studied. The Matlab/Simulink simulation platform was used to construct the frequency hopping transmission station model. Through the error rate computation and statistic module, the model is verified by a simulation example finally. © 2016 Taylor & Francis Group, London.


Yang S.,National University of Defense Technology | Zhang C.,National University of Defense Technology | Wang P.,National University of Defense Technology | Xue G.,Troop
2014 IEEE 7th Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2014 | Year: 2014

The aim of this paper is to present an integrated decision making framework for weapon application under uncertain environment. Within this framework, concise decision rules are extracted initially from original decision data based on fuzzy rough set theory. A set of appropriate weapon systems are identified through intuitionistic fuzzy reasoning using extracted fuzzy rules. Next, the optimal weapon system is selected from the set of alternatives by using fuzzy multi-attribute group decision-making methods. Then, the dynamic weapon-target assignment model is investigated on the basis of differential evolution algorithm. Ultimately, agile simulation provides a means for getting feedback on weapon system decisions. © 2014 IEEE.


Hu P.,Zhengzhou University | Shen J.,Zhengzhou University | Fang S.,Troop
Proceedings - 2012 IEEE 12th International Conference on Computer and Information Technology, CIT 2012 | Year: 2012

Combining cloud computing and mobile computing, a frame of Operational Command Training Simulation System based on mobile cloud computing was proposed, which includes infrastructure, platform, support, application and middleware layer. And the detail design of middleware layer was described. Some key technologies of the layer were settled as: cloud service access adapter, cache management and consistency maintenance strategy, data blocking and parallel processing. The bottleneck of the mobile terminal with limited resources had been solved, and the distribution and interoperability of simulation systems were enhanced. © 2012 IEEE.


Hongwei L.,PLA Military Transportation University | Yun X.,PLA Military Transportation University | Wuquan L.,PLA Military Transportation University | Wei Z.,Troop
Advanced Materials Research | Year: 2013

Biodiesel can be used as an alternative diesel fuel, but its physical and chemical properties determine its storage and transport and the use of management, according to its particular characteristics different from diesel fuel, this article analyzes the various characteristics and bio-diesel engine on the car the use of features, and thus summed up the bio-diesel in logistics management, to pay attention to specific issues. © (2013) Trans Tech Publications, Switzerland.


Man- machine- environment system theory provides important theoretical guidance and practical method to develop simulation training system; it is of important realistic significance for the development of simulation training system to apply these research results. This thesis is about the application of manmachine- environment system engineering theory in the development of simulation training system, introduces the functions and roles of simulation training system, explains the guiding significance of man- machine- environment system engineering theory to the development of simulation training system, and puts forward the basic thoughts to use man- machine- environment system engineering theory research results to guide the development of simulation training system. © Springer-Verlag Berlin Heidelberg 2015.


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Troop | Date: 2010-10-19

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