Optimization of architecture design has recently drawn research interest. System deployment optimization （SDO） refers to the process of optimizing systems that are being deployed to activi- ties. This paper first fo...Optimization of architecture design has recently drawn research interest. System deployment optimization （SDO） refers to the process of optimizing systems that are being deployed to activi- ties. This paper first formulates a mathematical model to theorize and operationalize the SDO problem and then identifies optimal so- lutions to solve the SDO problem. In the solutions, the success rate of the combat task is maximized, whereas the execution time of the task and the cost of changes in the system structure are mini- mized. The presented optimized algorithm generates an optimal solution without the need to check the entire search space. A novel method is finally proposed based on the combination of heuristic method and genetic algorithm （HGA）, as well as the combination of heuristic method and particle swarm optimization （HPSO）. Experi- ment results show that the HPSO method generates solutions faster than particle swarm optimization （PSO） and genetic algo- rithm （GA） in terms of execution time and performs more efficiently than the heuristic method in terms of determining the best solution.展开更多
Discusses in detail the deploying strategies and feature of the motion of the Tethered Space System and the effects of some parameters, such as the property and initial length of the tether, the perturbation of the at...Discusses in detail the deploying strategies and feature of the motion of the Tethered Space System and the effects of some parameters, such as the property and initial length of the tether, the perturbation of the atmosphere, the ellipse of the orbit and the mass distribution of the system and points out the deploying strategy is based on the controlling of tension and the length of tether. And concludes from the computer simulation results of a tethered atmosphere probing satellite deployment that the deploying strategy presented does work well.展开更多
This paper proposes a novel system deployment principle for master/slave islanded alternating current(AC)microgrids,with which decentralized control can be achieved without communications.The net power of a microgrid,...This paper proposes a novel system deployment principle for master/slave islanded alternating current(AC)microgrids,with which decentralized control can be achieved without communications.The net power of a microgrid,including active and reactive power,is metered and compensated locally and independently by its units.This can benefit a microgrid regarding system expandability,flexibility,and plug-and-play.The proposed strategy is demonstrated in a typical islanded AC microgrid with diesel generators,renewable generation,and hybrid storage.A diesel generator set with constant speed governor and static exciter runs to build up and dominate the main AC bus.An ultra-capacitor unit suppresses fastvarying power fluctuations,and the battery shares part of the slow-varying power component.The diesel generator set only provides slow-varying power within a lower limit,which can avoid dramatic accelerations and decelerations and low load-rate operation.Finally,simulations on MATLAB/Simulink are carried out to verify the proposed strategy in typical scenarios.展开更多
Deployment of buoy systems is one of the most important procedures for the operation of buoy system. In the present study, a single-point mooring buoy system which contains surface buoy, cable segments with components...Deployment of buoy systems is one of the most important procedures for the operation of buoy system. In the present study, a single-point mooring buoy system which contains surface buoy, cable segments with components, anchor and so on is modeled by applying multi-body dynamics method. The motion equations are developed in discrete node description and fully Cartesian coordinates. Then numerical method is used to solve the ordinary differential equations and dynamics simulations are achieved while anchor is casting from board. The trajectories and velocities of different nodes without current and with current in buoy system are obtained. The transient tension force of each part of the cable is analyzed in the process of deployment. Numerical results indicate that the transient payload increases to a peak value when the anchor is touching the seabed and the maximum tension force will vary with different floating configuration. This work is helpful for design and deployment planning of buoy system.展开更多
网际互连协议(Internet Protocol,IP)化技术凭借高带宽和灵活性等优势,为广播电视传输系统带来了新的可能,特别是在广播电视基带架构层,IP化音频(Audio over IP,AoIP)技术可以发挥重要作用,完成从源信号采集到发射的全过程音视频传输任...网际互连协议(Internet Protocol,IP)化技术凭借高带宽和灵活性等优势,为广播电视传输系统带来了新的可能,特别是在广播电视基带架构层,IP化音频(Audio over IP,AoIP)技术可以发挥重要作用,完成从源信号采集到发射的全过程音视频传输任务。基于此,介绍AoIP的相关概念、标准和应用优势,阐述基带架构的组成层次、采集编码和自动化功能,分析其技术特点。在此基础上,详细探讨AoIP技术在基带系统各层面的应用情况,包括AoIP网络部署、音视频流处理、自动化实现和同步方案等,并说明不同应用的效果。展开更多
基金supported by the National Natural Science Foundation of China(71171197)the National Basic Research Program of China(973 Program)(613154)
文摘Optimization of architecture design has recently drawn research interest. System deployment optimization （SDO） refers to the process of optimizing systems that are being deployed to activi- ties. This paper first formulates a mathematical model to theorize and operationalize the SDO problem and then identifies optimal so- lutions to solve the SDO problem. In the solutions, the success rate of the combat task is maximized, whereas the execution time of the task and the cost of changes in the system structure are mini- mized. The presented optimized algorithm generates an optimal solution without the need to check the entire search space. A novel method is finally proposed based on the combination of heuristic method and genetic algorithm （HGA）, as well as the combination of heuristic method and particle swarm optimization （HPSO）. Experi- ment results show that the HPSO method generates solutions faster than particle swarm optimization （PSO） and genetic algo- rithm （GA） in terms of execution time and performs more efficiently than the heuristic method in terms of determining the best solution.
文摘Discusses in detail the deploying strategies and feature of the motion of the Tethered Space System and the effects of some parameters, such as the property and initial length of the tether, the perturbation of the atmosphere, the ellipse of the orbit and the mass distribution of the system and points out the deploying strategy is based on the controlling of tension and the length of tether. And concludes from the computer simulation results of a tethered atmosphere probing satellite deployment that the deploying strategy presented does work well.
文摘This paper proposes a novel system deployment principle for master/slave islanded alternating current(AC)microgrids,with which decentralized control can be achieved without communications.The net power of a microgrid,including active and reactive power,is metered and compensated locally and independently by its units.This can benefit a microgrid regarding system expandability,flexibility,and plug-and-play.The proposed strategy is demonstrated in a typical islanded AC microgrid with diesel generators,renewable generation,and hybrid storage.A diesel generator set with constant speed governor and static exciter runs to build up and dominate the main AC bus.An ultra-capacitor unit suppresses fastvarying power fluctuations,and the battery shares part of the slow-varying power component.The diesel generator set only provides slow-varying power within a lower limit,which can avoid dramatic accelerations and decelerations and low load-rate operation.Finally,simulations on MATLAB/Simulink are carried out to verify the proposed strategy in typical scenarios.
基金supported by the National Natural Science Foundation of China (Grant No. 51175484)the Science Foundation of Shandong Province (Grant No. ZR2010EM052)
文摘Deployment of buoy systems is one of the most important procedures for the operation of buoy system. In the present study, a single-point mooring buoy system which contains surface buoy, cable segments with components, anchor and so on is modeled by applying multi-body dynamics method. The motion equations are developed in discrete node description and fully Cartesian coordinates. Then numerical method is used to solve the ordinary differential equations and dynamics simulations are achieved while anchor is casting from board. The trajectories and velocities of different nodes without current and with current in buoy system are obtained. The transient tension force of each part of the cable is analyzed in the process of deployment. Numerical results indicate that the transient payload increases to a peak value when the anchor is touching the seabed and the maximum tension force will vary with different floating configuration. This work is helpful for design and deployment planning of buoy system.
文摘网际互连协议(Internet Protocol,IP)化技术凭借高带宽和灵活性等优势,为广播电视传输系统带来了新的可能,特别是在广播电视基带架构层,IP化音频(Audio over IP,AoIP)技术可以发挥重要作用,完成从源信号采集到发射的全过程音视频传输任务。基于此,介绍AoIP的相关概念、标准和应用优势,阐述基带架构的组成层次、采集编码和自动化功能,分析其技术特点。在此基础上,详细探讨AoIP技术在基带系统各层面的应用情况,包括AoIP网络部署、音视频流处理、自动化实现和同步方案等,并说明不同应用的效果。
