螺旋桨特性四象限Chebyshev拟合式的建立与深潜艇直航全工况运动仿真的实现

具体给出了深潜艇螺旋桨四象限特性的Chebyshev多项式拟合表达式,并转换为普通多项式表达式。给出了螺旋桨四象限动态工作情况下的仿真模型。这使明确表达深潜艇推进电机负载的静、动态特性成为可能。据此建立了适用于四象限动态工况的深潜艇推进模型。运用以上结果对深潜艇进行了多方面的仿真,仿真结果与实艇试验数据有很好的一致性,证明了以上结果在用于四象限动态工况研究和仿真时的正确性和有效性。     

螺旋浆特性四象限Chebyshev拟合式的建立与深潜艇直航全工况运动仿真的实现

具体给出了深潜艇螺旋浆四象限特性的Chebyshev多项式拟合表达式，并转换为普通多项式表达式，给出了螺旋浆四象限动态工作情况下的仿真模型，这使明确表达深潜艇推进电机负载的静，动态特性成为可能，据此建立了适用于四象限动态工况的深潜艇推进模型。运用以上结果对深潜艇进行了多方面的仿真，仿真结果与实艇试验数据有很好的一致性，证明了以上结果在用于四象限动态工况和领导具时的正确性和有效性。     

并网双馈风力发电实时仿真控制方案研究

基于RT-LAB实时仿真平台设计了双馈异步电机并网发电的整体系统,给出了双变流器的矢量控制方案.应用解耦理论,分别对网侧和转子侧变流器采用电网电压定向和定子电压定向两种矢量控制方案.采用精确模型,在提高系统仿真可信度的同时改进了可移植性.实时仿真研究结果表明:精确模型的采用对系统整体控制效果的研究具有更高的精度及更好的移植性;给出的双变流器矢量控制方案具有良好的控制效果;实时算法快速精确,仿真平台优秀可靠,有效的缩短了研究工作的产业化过程.     

粒子滤波器重采样算法的分析与比较

重采样算法解决了粒子滤波器的退化问题.从重采样实现原理、均匀分布理论和计算复杂度的角度对目前广泛应用的四种重采样算法(包括多项式重采样、残差重采样、分层重采样和系统重采样)进行了理论分析,同时引入有效样本数,设定重采样阈值,将四种算法应用于经典纯方位跟踪,通过仿真比较不同重采样算法条件下的运行时间和跟踪性能,并分析重采样阈值的设定对滤波性能的影响.仿真表明,四种算法在跟踪性能上很接近,系统重采样和分层重采样算法下的运行时间很接近,优于其余两种算法,设定重采样闽值后,整体跟踪误差减小了约50%,但并未明显减慢跟踪误差随时间推移的发散趋势.     

相干式CO_2激光雷达角跟踪系统

本文简述了相干式ＣＯ２激光雷达角跟踪系统的工作原理，讨论了激光雷达距离方程，分析了四象限探测器跟踪方法及误差特性。对于扩展朗伯目标，可采用边沿跟踪。为了提高信噪比，用频率搜索及窄带滤波的方法来检测信号，文中给出了接收机方框图和实验结果，本文还讨论了通道不一致性影响及校正方法。     

开关磁阻电动机控制器的仿真研究

介绍了开关磁阻电动机的准线性数学模型，以此为基础，使用Matlab／Simulink建立了通用的开关磁阻电机仿真模型；设计了电压斩波控制，电流斩波控制，换相控制等开关磁阻电机控制器的通用模块，从而建立了开关磁阻驱动系统仿真模块库。研究重点是设计基于皮特里网络(Petri-Net)的SRD控制策略选择器，并提出适用于微控制器实时控制的皮特里网络算法，仿真和实验结果都表明对优化SRD的四象限运行控制有较明显的效果，可应用于实际。     

基于HAQ模型的城镇居民住房支付能力研究

文章在分析住房支付能力典型指标的基础上,从“首付+月付”的维度构建了住房支付能力象限(HAQ)模型.模型设定完全支付能力、无支付能力、收入依赖型支付能力和财富依赖型支付能力四个象限,是四种不同的住房支付能力状态.当首付能力(DPA)不小于1时,家庭储蓄能够承担住房首付;当月付能力(MPA)不小于1时,家庭剩余收入能够支付住房每月还款额;反之则存在住房支付问题.最后以中国35个大中城市为例进行了模型测算,发现2012年中国35个大中城市普遍存在不同的住房支付问题,并且表现出明显的区域差异;象限模型与房价收入比在结果上具有可比性,且象限模型从内涵上更为丰富,为中国居民住房支付理论发展,住房市场运行状态和居民住房压力评价提供了新思路.     

三相电压型PWM整流器四象限运行的系统仿真分析

深入分析了三相电压型PWM整流器四象限运行时的电压需求,给出了SVPWM调制下的最大线性运行区域。针对初始浪涌电流冲击和负载扰动,提出一种基于I-P控制的改进型负载电流前馈的双闭环控制策略。利用MATLAB/Simulink仿真环境,根据伺服电机系统不同工况时的负载特点,对系统进行了全面的仿真实验,最后对动静态性能做出客观评价。     

脉冲直接力控制简易制导弹药命中精度研究

研究了基于弹体捷联激光四象限探测器体制下,利用脉冲力进行质心控制的弹道修正技术.通过外弹道模型的建立和数值仿真,研究了弹丸落角、脉冲发动机作用位置偏离质心距离、脉冲发动机工作宽度和总冲散布等因素对于弹道修正精度的影响,对比得出了影响弹丸修正精度的主要因素,为工程实现提供理论支持.     

基于滑模控制的三相电压型PWM整流器系统仿真

三相电压型PWM整流器(VSR)用于AC/DC/AD系统前端整流器时,由于PI控制的滞后性及其比例积分系数对系统参数的敏感性,很难在四象限运行中保持良好的动态性能和鲁棒性。考虑到VSR本身非线性的特点,提出了一种基于同步旋转坐标系的双闭环滑模变结构控制算法,在MATLAB/SIMULINK环境建立了仿真模型,对滑模算法和PI算法进行了对比仿真。结果表明,较之PI算法,滑模算法具有更好的动态响应。     

The 12th International Conference on Service Systems and Service Management ICSSSM'15

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Enterprise resource planning implementation decision & optimization models

To study the uncertain optimization problems on implementation schedule, time-cost trade-off and quality in enterprise resource planning (ERP) implementation, combined with program evaluation and review technique (PERT), some optimization models are proposed, which include the implementation schedule model, the timecost trade-off model, the quality model, and the implementation time-cost-quality synthetic optimization model. A PERT-embedded genetic algorithm (GA) based on stochastic simulation technique is introduced to the optimization models solution. Finally, an example is presented to show that the models and algorithm are reasonable and effective, which can offer a reliable quantitative decision method for ERP implementation.     

A calculus for services innovation

Innovation in the services area - especially in the electronic services （e-services） domain - can be systematically developed by first considering the strategic drivers and foci, then the tactical principles and enablers, and finally the operational decision attributes, all of which constitute a process or calculus of services innovation. More specifically, there are four customer drivers （i.e., collaboration, customization, integration and adaptation）, three business foci （i.e., creation-focused, solution-focused and competition-focused）, six business principles （i.e., reconstruct market boundaries, focus on the big picture not numbers, reach beyond existing demand, get strategic sequence right, overcome organizational hurdles and build execution into strategy）, eight technical enablers （i.e., software algorithms, automation, telecommunication, collaboration, standardization, customization, organization, and globalization）, and six attributes of decision informatics （i.e., decision-driven, information-based, real-time, continuously-adaptive, customer-centric and computationally-intensive）. It should be noted that the four customer drivers are all directed at empowering the individual - that is, at recognizing that the individual can, respectively, contribute in a collaborative situation, receive customized or personalized attention, access an integrated system or process, and obtain adaptive real-time or just-in-time input. The developed process or calculus serves to identify the potential white spaces or blue oceans for innovation. In addition to expanding on current innovations in services and related experiences, white spaces are identified for possible future innovations; they include those that can mitigate the unforeseen consequences or abuses of earlier innovations, safeguard our rights to privacy, protect us from the always-on, interconnected world, provide us with an authoritative search engine, and generate a GDP metric that can adequately measure the growing knowledge economy,     

论生物系统中的功能不守恒性

根据能量守恒定律，能量一次转换所做的总功应等于输入的总能量。但在生物系统中，能量的转换是多次的，其总功之和大于系统输入的总能量，此现象称之为功能不守恒性。能量转换效率越高，功能差别越大。能量通过细胞水平的多次转换，总功可提高至2倍左右。能量通过生态系统水平多次转换，总功可提高至1．4倍左右。通过系统内各子系统能流之和称为序能，反映了系统有序性大小，它取决于系统输入总能量和能量转换效率。根据序能原理，用GDP^2／9(GDP为国内生产总值，Q为能量总输入)反映人类社会功能和效率，要比单纯用GDP更客观。绿色GDP应同时考虑使GDP^2／Q增长最大和使自然生态系统的序能最大。人的经济行为和动物的行为对策也符合序能原理。     

Dealing with Human Relations in Chinese Systems Practice

This paper is about the Wuli, Shili, Renli (WSR) systems methodology. An important concept within this, Renli, has been developed from Confucian philosophy to clarify to Chinese researchers the necessity of dealing with human relations in systems practice. At present, the only formal means of operationalizing Renli that people are exploring in China is to import from the West methods for organizing debate. However, the concept of Renli suggests that more is needed than methods alone. In particular, facilitation skills are required. It is argued that the development of facilitation skills can be enhanced if researchers can gain both theoretical and practical knowledge of group dynamics, and engage in activities of self-reflection to look at, and alter, their own roles in these dynamics and the wider sociopolitical system. There are therefore three aspects to Renli: the use of systems methods for organizing debate, the acquisition of facilitation skills, and self-reflection geared toward the development of facilitation skills and enhanced critical awareness of the politics of intervention.     

云环境中邮件服务器面向传输的优化设计

随着云计算的发展,新的应用不断涌现,但电子邮件服务依然占有着重要的地位.邮件服务器是一种I/O密集的应用.在云计算时代,越来越多的用户邮件保存在服务器端,邮件在从客户端传输到服务器端之前,邮件或者邮件的部分内容在服务器端可能已经存在.基于这种现象,提出了一种方案,通过引入计算的代价来降低通信量,从而提高邮件服务器的处理能力.对电子邮件的格式和SMTP协议进行了扩充,引入了附件和正文分离传输的模式.在邮件传输时,客户端先计算附件的散列值,并作为正文的一部分传输到服务器端,服务器端再根据散列值来判断附件是否需要传输.     

金工工艺的优化设计

运用价值工程与运筹工程理论, 在金工工艺单项设计指标优化的基础上, 对其设计指标也进行了全面优化。     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

正August 10-14,2015Beijing,China The International Congress on Industrial and Applied Mathematics(IClAM)is the premier international congress in the field ofapplied mathematics held every four years under the auspices ofthe International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists and entrepreneurs fiom around the world will gather in Beijing,China for the 8th IClAM to be held at     

基于动力学仿真的多管火箭多因素分析

多管火箭武器的系统效能有多个指标,而每个指标又受到多个因素复合影响。按照武器系统效能分析的递阶层次,梳理了多管火箭性能分析的多因素问题。提出了基于虚拟样机动力学仿真过程多因素问题的数据挖掘方法及分析手段,弥补了传统方法对多因素问题决策分析的不足。并以多管火箭系统效能第四级指标起始扰动的三种影响因素为例进行了研究和验证。