霍林河电厂燃烧系统及其设备选型

关于300MW燃煤锅炉电厂燃烧系统的选型，各电厂在设计中有不同依据．该文根据内蒙古霍林河地区的地理、气候情况，以及所用煤质特点，介绍了霍林河电厂300MW机组的燃烧系统和磨煤机、一次风机、二次风机、引风机的选型依据，以及最终的选用，以供设计人员参考。     

阀冷系统管道泄漏专用检修工具的研究

本文以阀冷系统管道泄露检修为核心,针对专用检修工具进行设计研究,主要包括三部分设计内容,依次为：针对换流阀层间冷却水管的紧固力矩工具、针对冷却水系统焊缝渗漏的快速封堵工具及针对冷却水系统主回路阀类的拆装工具。本文所设计的冷却水系统专用检修工器具套装,主要用于检测、预防特定位置水管接头泄露和泄露后快速处理,避免因管道泄露影响水冷系统正常运行。本文的研究内容具有良好的推广性,成果可推广到所有直流换流站,不但适用于高压直流输电行业,也可应用于相同场景的其它行业,具有较高的社会效益和经济效益。     

普通无心磨床加工气门锁夹槽的技术改造

将普通无心磨床改进设计为加工气门锁夹槽的专用磨床,实施气门锁夹槽成形磨削的工作流程,实现砂轮成形修正进给和导轮进给补偿的联动,满足气门锁夹槽成形磨削的要求.     

直槽齿轮滚刀刃磨的简易工具

齿轮滚刀的刃磨,在大中型工厂企业,一般部是采用专用滚刀磨床刃磨,这种磨床具有精确的分度机构,并有对刀、进刀及砂轮修正等装置,刃磨滚刀的质量及效率均较高。 我厂是乡镇企业,属小型工厂,没有这种设备,而我厂目前根据制造设备的现实需要,每年约需刃磨660把次左右,通常都是外协刃磨,这样不但花费大,而且还不及时,常常耽误生产。针对这种情况,我们学习制作了如图所示的工具,在万能工具磨床上刃磨滚刀,取得了满意的效果。     

基于实例推理的柴油机辅助匹配选型的研究

以柴油机的匹配选型为应用背景,研究并开发了一个基于案例推理的柴油机辅助匹配选型系统原型,以实现对柴油机的匹配选型。系统依据柴油机的用途和主要特征属性将柴油机进行分类,根据层次分析（AHP）法确定各特征项的权重,进而根据最近邻算法对某一种类的案例集进行检索排序,最后构建了软件原型系统。通过对柴油机匹配选型案例进行仿真测试,表明了设计思想是合理的,实现方法是有效的。     

熔盐塔式太阳能热发电站中蒸汽发生系统水循环方式的对比分析

蒸汽发生系统水循环方式的选择对熔盐塔式太阳能热发电站的投资经济性及安全稳定运行至关重要。对熔盐塔式太阳能热发电站的蒸汽发生系统进行了介绍，对蒸汽发生系统的两种水循环方式——自然循环方式和强制循环方式进行了技术性和经济性对比分析。分析结果表明：在目前熔盐塔式太阳能热发电站采用高温、超高压参数下，自然循环方式及强制循环方式技术路线均能满足熔盐塔式太阳能热发电站蒸发换热的需求；若选择强制循环方式，在设备选型时，应将强制循环泵的结构及运行环境作为重点进行综合分析；结合国内已建成的熔盐塔式太阳能热发电项目的运行经验及太阳能热发电技术的发展趋势，熔盐塔式太阳能热发电站蒸汽发生系统的出口主蒸汽压力在亚临界以下(<16 MPa)时，从技术性、经济性及运行维护方面综合考虑，水循环方式推荐采用自然循环方式。以期为熔盐塔式太阳能热发电站蒸汽发生系统的设计选型提供参考。     

汽轮机DEH系统中电液转换器性能的分析与比较

电液转换器的选型是DEH系统设计的关键问题之一,在实际应用中选择的主要是MOOG阀和DDV阀,它们各有优缺点。就响应时间、流量、灵敏度和油质这4项指标对G761型MOOG阀和D634型DDV阀在透平油压力为4MPa下的性能进行分析和对比,得出了一些结论,可供选用时参考。     

光伏系统电缆设计选型优化研究

为了优化光伏系统电缆选型设计方法,提高电缆选型的规范程度,总结了在多种敷设形式下的电缆选型设计方法,并在此基础上分析温升法和经济电流法在光伏系统电缆选型方面的适用性。提出适用性较广的光伏系统电缆选型设计优化方法,为光伏发电系统的工程设计提供有力的支持。     

基于实例推理的柴油机辅助匹配选型的研究

以柴油机的匹配选型为应用背景,研究并开发了一个基于案例推理的柴油机辅助匹配选型系统原型,以实现对柴油机的匹配选型.系统依据柴油机的用途和主要特征属性将柴油机进行分类,根据层次分析(AHP)法确定各特征项的权重,进而根据最近邻算法对某一种类的案例集进行检索排序,最后构建了软件原型系统.通过对柴油机匹配选型案例进行仿真测试,表明了设计思想是合理的,实现方法是有效的.     

基于模型的电控单体泵怠速控制策略的开发

以电控单体泵控制系统的开发为研究背景，进行了基于模型的电控单体泵怠速控制算法的V模式开发：利用Matlab／Simulink仿真工具，建立了电控单体泵怠速控制算法模型；利用TargetLink自动代码生成工具，实现模型程序代码至控制系统标准C代码的生成，同时对控制算法模型进行模型在环仿真与软件在环仿真以考察代码的生成精度；通过仿真开发工具实现模型代码的硬件下载；利用硬件在环仿真系统以及标定工具实现对控制策略算法的校验以及参数的在线优化。仿真与硬件在环测试结果表明：所设计的怠速闭环控制算法能够满足电控单体泵控制系统的需要；TargetLink是一个比较好的软件代码生成工具；V模式开发方案是一种有效的电控单体泵控制系统的开发流程，在缩短开发周期的同时，降低了开发成本。     

Two-axis model development of cage-rotor brushless doubly-fedmachines

A two-axis model of a cage-rotor brushless doubly-fed machine (BDFM) which is suitable for machine and BDFM drive system dynamics studies is presented. The technique enables the two-axis model to be derived from a detailed model recently developed for investigation of design aspects of the machine. Unlike the conventional approaches to self-cascaded machines analysis, this method permits analysis of the machine characteristics in both dynamic and steady state conditions, and also facilitates machine and drive system design by directly correlating machine performance with machine structure and parameters. The approach allows the machine parameters to be calculated from machine geometry and developed into the model parameters     

曲轴轴径专用测量工具的设计与应用

简要介绍P11C六缸发动机曲轴加工过程中轴径的在线测量方法及其专用检具(梯形卡规)的设计。并使用埃帝科曲轴综合测量仪测量曲轴,其测量数据和检具测量数据进行对比分析,为检具准确性的确认提供了依据。检具操作简单,满足了现场快速测量的需要,测量数据直接可指导加工机床的精度调整。     

镗床数控与电气系统的技术改造

本文阐述了数控与电器控制系统在卧式镗铣床技术改造中应用的具体设计思想和实现的方法。介绍了SINUMERIN 810C数控系统对直流伺服电机变速驱动系统控制所实现的宽的调速范围、高的稳定精度、快的动态响应及在四象限内运动等良好的技术特性；描述了该机床CNC控制的结构特点。     

Multiple reference frame analysis of a multistack:variable-reluctance stepper motor

A multistack variable-reluctance stepper motor is analyzed using the concept of multiple reference frames. The average-value model developed is shown to approximately predict steady-state and dynamic operation of this device. Moreover, the state variables of this model are constant in the steady state. Therefore, the differential equations which describe this model can be linearized whereupon an eigenvalue analysis can be used to investigate dynamic instabilities. It is shown that this approach can be used to approximately predict the occurrence of parametric instability which heretofore has not been achieved using an eigenvalue analysis. The average-value model established in this paper should serve as a unique tool to aid in the design of the machine as well as the controls associated with the electronic drive system     

筑路机械冷却装置液压驱动系统研究

就筑路机械用冷却系统对筑路机械发动机的重要性进行分析，并说明了冷却不合理可能对发动机造成的不良后果。对冷却系统驱动方式进行了分类，介绍了各自的主要发展过程，并分别分析了优点及不足，最后提出了一种新型的筑路机械用冷却系统，克服了传统冷却系统定传动比及单一驱动方式的缺点，减小了空气流动阻力，提高了热交换能力，     

A laboratory model for harmonic measurements in windpowergenerators

In this letter we present the principles of an integrated control and measurement system which is linked to a DC servo motor used to drive a single-phase induction machine. The role of the DC servo motor is to model the drive from the turbine of a wind energy conversion system (WECS). This drive is in turn physically connected to a single-phase induction machine that is in turn linked to an external single-phase supply and various loads applied. Measurements of the harmonic components from the system are obtained from a desktop computer with analog to digital interface cards running programs developed under LabVIEW software. The system demonstrates the greatest change in harmonic components just before onset of power generation and thereafter settles to a constant level. Work is planned to expand the system to include more nodes, three phase capabilities, and reactive power electronic control     

A generalized computer-aided formulation for the dynamic and steadystate analysis of induction machine inverter drive systems

A generalized formulation for the computer-aided analysis of induction machine drives including feedback controls is presented. A simple circuit model for the induction machine is developed to enhance the conventional drive formulation. This model eliminates a general difficulty encountered in the automatic formulation of machine dq -terminal constraints imposed by the drive operations. An efficient algorithm is proposed using a simple nodal approach for automatic formulation of power electronic circuits. This algorithm, combined with the proposed machine circuit model, can easily be used to simulate an arbitrarily configured drive system including the effects of control dynamics. A pulse-width-modulated current-source-inverter drive system is employed to demonstrate the efficiency of the proposed formulation. The dynamic and steady-state performance of this drive system including an effective harmonic control are simulated. The simulated results are experimentally verified     

基于VERICUT的汽轮机大叶片数控加工仿真的应用

利用数控加工仿真软件VERICUT实现了汽轮机大叶片四坐标数控加工仿真.该仿真系统针对四坐标加工中心建立了相应的刀具、机床、回转工作台和夹具模块以及配置了机床控制系统,详细介绍了各个子系统的体系结构、功能以及实现的关键技术.以汽轮机大叶片为例,利用仿真模块对四坐标加工进行动态仿真,实现了汽轮机大叶片的四坐标虚拟加工中的"干涉、过切及碰撞"检查.     

A step-down chopper-controlled slip energy recovery induction motordrive

The design of a chopper-controlled slip energy recovery drive, also known as a static Kramer drive, demands an exact knowledge of the steady state and dynamic performance of the system over the complete operating range. To accomplish this, a coupled circuit approach is necessary whereby the self and mutual coupling effects, voltage and current harmonics in the machine and voltage and current ripple at different points in the drive system are duly taken into account. Such a model should enable the accurate prediction of all instantaneous current values which leads to accurate prediction of electric torque and harmonics injected into the supply. This paper presents a model to accomplish the above. Mathematical predictions are verified with experimental results