Forhigh power applications,multilevel converters have many advantages in comparison with other circuit topologies with output transformers. Cascaded inverters are one type of multilevel converters,they are easy to imp...Forhigh power applications,multilevel converters have many advantages in comparison with other circuit topologies with output transformers. Cascaded inverters are one type of multilevel converters,they are easy to implement,very suitable for modularized layout and packaging.Their manufacturing cost is low.A multilevel PWM technique,called as General Technique of Selected Harmonics Elimination (GTSHE) ,is proposed in the paper. A general harmonic elimination equation for N cells,M pulses per half cycle,nth harmonic is derived,and verified by simulation results.展开更多
A more general form of projective synchronization, so called linear generalized synchronization （LGS） is proposed, which includes the generalized projective synchronization （GPS） and the hybrid projective synchron...A more general form of projective synchronization, so called linear generalized synchronization （LGS） is proposed, which includes the generalized projective synchronization （GPS） and the hybrid projective synchronization （HPS） as its special cases, Based on the adaptive technique and Lyapunov stability theory, a general method for achieving the LGS between two chaotic or hyperehaotic systems with uncertain parameters in any scaling matrix is presented. Some numerical simulations are provided to show the effectiveness and feasibility of the proposed synchronization method.展开更多
效应实验研究是高功率微波(High Power Microwave,HPM)技术持续发展的基础,也是获取目标对象效应阈值的最重要手段。采用窄谱高功率微波实验系统开展了对某微小型固定翼无人机的动态扰乱效能验证测试。无人机的机载飞行数据表明,高功率...效应实验研究是高功率微波(High Power Microwave,HPM)技术持续发展的基础,也是获取目标对象效应阈值的最重要手段。采用窄谱高功率微波实验系统开展了对某微小型固定翼无人机的动态扰乱效能验证测试。无人机的机载飞行数据表明,高功率电磁脉冲辐照无人机后,升降舵的偏转角由-5.9°急剧变化至-25°并出现“锁死”现象;方向舵的偏转角由0.1°剧烈变化至9.7°,随后出现非规则性地跳变。综合高功率电磁脉冲对无人机“后门”耦合效应过程分析认为,主要是扰乱了无人机飞控系统的中央处理器,致使其向舵机输出紊乱控制指令,直接引起升降舵和方向舵的偏转角发生剧烈变化,导致无人机进入失控状态并快速盘旋坠落。展开更多
As an energy generating equipment, the engine-generator set supplies power to the electric transmission. Therefore, its control is one of the key technologies of electric vehicles. Based on the discussion about the de...As an energy generating equipment, the engine-generator set supplies power to the electric transmission. Therefore, its control is one of the key technologies of electric vehicles. Based on the discussion about the demands to the engine-generator set in tracked vehicles, the detailed function of engine-generator and the control strategy are determined. The hardware and software of the control system are also developed and tested in a prototype vehicle. The experiment results show that the control system has good reliability and can satisfy the power requirements of vehicles under all operating conditions.展开更多
文摘Forhigh power applications,multilevel converters have many advantages in comparison with other circuit topologies with output transformers. Cascaded inverters are one type of multilevel converters,they are easy to implement,very suitable for modularized layout and packaging.Their manufacturing cost is low.A multilevel PWM technique,called as General Technique of Selected Harmonics Elimination (GTSHE) ,is proposed in the paper. A general harmonic elimination equation for N cells,M pulses per half cycle,nth harmonic is derived,and verified by simulation results.
基金the National Natural Science Foundation of China (60574045 10661006).
文摘A more general form of projective synchronization, so called linear generalized synchronization （LGS） is proposed, which includes the generalized projective synchronization （GPS） and the hybrid projective synchronization （HPS） as its special cases, Based on the adaptive technique and Lyapunov stability theory, a general method for achieving the LGS between two chaotic or hyperehaotic systems with uncertain parameters in any scaling matrix is presented. Some numerical simulations are provided to show the effectiveness and feasibility of the proposed synchronization method.
文摘效应实验研究是高功率微波(High Power Microwave,HPM)技术持续发展的基础,也是获取目标对象效应阈值的最重要手段。采用窄谱高功率微波实验系统开展了对某微小型固定翼无人机的动态扰乱效能验证测试。无人机的机载飞行数据表明,高功率电磁脉冲辐照无人机后,升降舵的偏转角由-5.9°急剧变化至-25°并出现“锁死”现象;方向舵的偏转角由0.1°剧烈变化至9.7°,随后出现非规则性地跳变。综合高功率电磁脉冲对无人机“后门”耦合效应过程分析认为,主要是扰乱了无人机飞控系统的中央处理器,致使其向舵机输出紊乱控制指令,直接引起升降舵和方向舵的偏转角发生剧烈变化,导致无人机进入失控状态并快速盘旋坠落。
文摘As an energy generating equipment, the engine-generator set supplies power to the electric transmission. Therefore, its control is one of the key technologies of electric vehicles. Based on the discussion about the demands to the engine-generator set in tracked vehicles, the detailed function of engine-generator and the control strategy are determined. The hardware and software of the control system are also developed and tested in a prototype vehicle. The experiment results show that the control system has good reliability and can satisfy the power requirements of vehicles under all operating conditions.
