Unicode Charset Support in Java Programming

摘要: 在信息国际化的今天, 正确处理不同的语言文字已经成为绝大多数软件系统的必备功能, 该文介绍了在Java 程序设计中如何 处理和显示不同的语言文字, 尤其是非英文字符的处理。本文从基本的编码知识入手, 详细介绍了Java 语言中编码转换的技术, 并给出 了可以用于实际开发的实例代码, 为构建国际化的Java 软件系统打下良好的基础。Abs tract: Currently, Multi languages support is a key feature of software product. It is necessary to process and display the characters in different languages correctly. This article give a brief introduction of encoding first, then show you how to handle the encoding/ decoding in Java, provide some demo codes could be used in development at last. All of these make contribution on building software with international, multi languages support

Analysis and optimization of SVPWM strategy for a six-phase inverter

为提高六相电压源逆变器的稳定性,最大限度地降低系统功率损耗,通过分析六相电压源逆变器相邻四矢量控制策略,并结合其本身所具有的开关特性,合理利用不同类型的零电压矢量,并调整其在一个开关周期中的作用时间,以达到改善功率器件开关模式的目的,从而优化了六相电压源逆变器空间矢量脉宽调制(SVPWM)策略.仿真结果表明,传统的电压矢量调制方式相比,该方法在不同调制深度下具有理想的谐波特性,同时可以有效地降低逆变器开关损耗.In order to improve the stability and reduce system power loss of a six-phase voltage source inverter,the adjacent four vectors control strategy was analyzed,as well as its own switching characteristics,so as to use different types of zero-voltage vector rationally and adjust the acting time in one switching cycle.By this means,the switching mode of a power device was improved,thereby optimizing the space vector pulse width modulation(SVPWM) strategy of the six-phase voltage source inverter.The simulation results show that compared with the conventional voltage vector modulation mode,the proposed method has ideal harmonic characteristics under different modulation depths,and at the same time,it can effectively reduce the inverter switching losses.国家985工程建设基金资助项目(0630X13400

Application of Public Telephone Network for Intelligent Home

利用单片机控制技术实现一种新的智能家居远程控制系统。该系统以公共电话网络为主要的信号载体,采用密码验证方式识别用户的合法身份,利用电话机上的按键作为控制命令键实现对家用电器的控制。在对家用电器进行控制的过程中,采用电力载波调制解调的方式,达到在对家用电器控制时无需单独布线的优点。同时当系统识别到用户家里有特殊情况时,如火灾、被盗、煤气泄漏等,可以实现自动拨号报警。系统会自动根据用户预先设定的拨号号码,发出报警信息,达到向用户报警的目的。Single chip computer control technology is applied to design a new intelligent home remote control system which uses the public telephone network as a key signal carrier and identifies the user′s legal status with password verification method.It uses the telephone button to control the household appliances.In the control process it uses power line carrier modem to control the household appliances,so it has the advantage of no separate wiring.At the same time,if the house occurs some special circumstances such as fire,theft,gas leak,etc,it can automatically sends the alarm information to users

Two-degree-freedom internal model control for current loop of small rotational inertia PMSM

为改进小转动惯量永磁同步电机电流动态响应性能,建立考虑旋转反电动势和逆变器环节的永磁同步电机电流环三阶数学模型,以该数学模型为基础,设计小转动惯量永磁同步电机电流环二自由度内模控制器。并针对该电流控制系统的鲁棒性能与内模控制器参数、反馈滤波器参数都相关的问题,引入新的反馈滤波器,使两参数分别调节系统的动态跟踪性能和鲁棒性能。详细分析该内模控制方法下系统参数敏感度和负载对电流动态性能的影响。最后通过仿真和实验,表明该方法有助于提高小转动惯量永磁同步电机电流动态响应性能,且参数调整简单明确。In order to improve the current dynamic response performance of small rotational inertia permanent magnet synchronous motor(PMSM),a three-order mathematic model of current loop considering rotating electromotive force and inverter was built.Based on that,a two-degree-freedom internal model control(2Dof-IMC) for current loop was proposed.With the problem,robustness of 2Dof-IMC system was dependent on two parameters of the feedback filter and internal controller,a new feedback filter was designed.Then current dynamic following performance and system robustness can be adjusted by corresponding parameter.In addition,the system sensitivity function and effect of load on current dynamic response performance were analyzed in detail.Finally by means of simulation and experiment,it is confirmed that this control strategy can improve the current dynamic response performance of small rotational inertia PMSM,and adjustment of its parameter is simple and definite.福建省自然科学基金(2010J05141

三自由度冗余驱动并联机构的奇异性和工作空间分析

基于4-SPS/S三自由度冗余驱动并联机构的位置逆解模型,运用微分法推导出了该并联机构的雅可比矩阵,结合Gosselin奇异性分析法和数值分析法,分析了该并联机构的奇异性。随后分析了影响4-SPS/S三自由度冗余驱动并联机构工作空间的主要因素,并对其各支链的行程限制、各球铰副的转角限制和各支链间的尺寸干涉限制等影响因素进行了解析化分析。最后,基于4-SPS/S三自由度冗余驱动并联机构的位置正解模型,设计了该并联机构回转工作空间的求解算法。该算法避免了数值方法及几何方法的复杂性和不确定性,实现了回转工作空间的直观性表达。厦门大学“985工程”专项资金资助项目(0000-X07204);福建省自然科学基金资助项目(2010J05141);南昌航空大学博士启动基金资助项目(EA201204428

SVPWM Control Strategy for Six-Phase Voltage Source Inverter

在对六相电压源逆变器矢量控制的分析基础上,结合六相系统电压矢量开关模式的特点,通过对两个零矢量在开关周期中的合理分配,提出新的适用于六相电压源逆变器空间矢量控制方法。该方法在保证输出性能的前提下可以有效地降低开关损耗。仿真结果验证了该方法的有效性。Based on the vector control analysis of a six-phase voltage source inverter and combined with the characteristics of the six-phase system voltage vector switch mode,a new SVPWM control stratygy was proposed by rationally allocating the two zero vectros in the switching cycles.The method can effectively reduce the switching lossed with the guaranty of the output performance.Simulation results verify the effectiveness of the method

基于函数矩阵的一类混沌系统同步

研究了一类混沌系统的同步问题、基于稳定性理论和极点配置技术,设计了两个混沌系统之间的同步方案,实现两个混沌系统之间的同步,通过函数矩阵,实现驱动系统和响应系统的状态变量按给定的函数矩阵同步,同时证明了该方法同样适用于两个混沌系统之间的滞后同步,通过对Lorenz混沌系统和Lorenz超混沌系统的数值模拟,进一步验证了所提方案的有效性

Acceleration Performance Index Analysis of Spatial 3-Dof Parallel Manipulator with Redundant Actuator

在建立空间三自由度冗余驱动并联机构HESSIAn矩阵的基础上,研究空间三自由度冗余驱动并联机构的加速度全域性能指标。在预设工作空间内,绘制加速度全域性能指标图谱。通过观察图谱,分析加速度全域性能指标随并联机构尺寸参数变化的分布规律。结果表明:ηA的最大值为0.803 7,即加速度性能指标最优,对应的结构参数为l_1=3.0 M,l_2=4.0 M,l_3=0.5 M,l_4=3.0 M;加速度性能指标好的空间三自由度冗余驱动并联机构组型主要集中在2.5 M≤l_1≤3.0 M,3.5 M≤l_2≤4.0 M,0.5 M≤l_3≤1.0 M,2.5 M≤l_4≤3.0 M的区域。The acceleration global performance index of spatial three degree-of-freedom parallel manipulator with redundant actuator was researched by Hessian matrix.The performance atlas was drawn in the default workspace.The geometry size distribution law of spatial three degree-of-freedom parallel manipulator with redundant actuator was analyzed,and the optimal size range under acceleration global performance index was established by the performance atlas.The results show that the best acceleration global performance indexηais 0.803 7 and the corresponding structure parameters are l_1= 3.0 m,l_2= 4.0 m,l_3= 0.5 m,l_4= 3.0 m,furthermore the good acceleration global performance areas are 2.5 m≤l_1≤3.0 m,3.5 m≤l_2≤4.0 m,0.5 m≤l_3≤1.0 m,2.5 m≤l_4≤3.0 m.江西省青年自然科学基金项目(20151BAB217022); 江西省教育厅青年科学基金项目(GJJ14549); 南昌航空大学博士启动金项目(EA201204428

Multi-computer control based on CAN bus for air compressors

分析传统空压机多机联控系统的不足之处和CAN总线的特点,提出一种各空压机在没有总调度机的情况下,通过动态分配算法,实现多机联控的方法.该方法使系统在部分空压机出故障时能做到"无缝连接",从而保障系统的正常运行.在该空压机系统中,通过CAN总线实现空压机的分散控制、多机联控,使空压机系统运行在最佳工况,实现各空压机的等疲劳运行.The disadvantages of traditional multi-computer control system used on air compressor system and features of CAN bus are analyzed.Dynamic distribution algorithm used for realizing multi-computer control without the scheduling of the host computer is presented,which realizes switching among the computers without the disturbance to the whole system when some computers are disable.In the control system of air compressor,the CAN bus is used to realize multi-computer control.So the air compressor system would work in optimal state,and the air compressors work in equal fatigue state

Application of Siemens PLC in Center Air Adjusting System

介绍了在医院病房的空气调节系统中使用西门子PLC及SOFTPANEL组态软件对医院病房进行温度、湿度、压差等方面进控制,针对控制要求用一套冷热混合系统代替一般工程上用的供冷、供热两个系统达到了节约投资及减少铺设管道的目的。The paper Introduces Siemens PLC and SOFTPANEL configuration software are used in Sickroom Center Air Adjusting System.The system mainly control temperature and humidity and pressure and so on.Using a cold heat mix system replace the normal using cold and heat two system,so it saves the investment and reduces laying the pipe