基于Simulink的液压起升机构仿真研究

探讨了基于Simulink平台的液压起升机构建模与仿真方法。利用Simulink的SimMechaics模块集建立了起升机构的机械模型,采用改进的节流流量模型,基于节点法建模思想建立了易于计算机求解的液压系统模型,根据液压、机械系统的参数关联关系将两个系统模型有机集成起来,得到较为完整的液压起竖机构仿真模型,并给出了仿真结果,对起升机构的性能分析和智能控制算法的应用研究具有实际意义。同时指出,该方法能够实现机械、液压、控制系统仿真模型的有机集成,对复杂机电液一体化系统的仿真与优化研究具有借鉴意义。     

钢管水压试验机主液压系统建模与仿真

以钢管水压试验机液压系统为研究对象,阐述了水压试验机的工作流程和主液压系统工作磊理:选择AMESim作为软件环境,建立了该系统基于AMESim的主要元件子模型,并搭建成完整的某钢厂3号线水压试验机主液压系统模型,设置了模型中的主要参数,实现了该液压系统动态性能仿真.仿真结果表明,应用AMESim软件可以有效地对钢管水压试验机主液压系统进行模拟,取得了较好的结果,为进一步的深入研究奠定了坚实的基础.     

液压挖掘机工作装置仿真研究

简述了AMESim软件的性能和特点，对挖掘机工作装王的液压系统和机构在AMESim环境下进行了建模，设王了模型中的主要参数，实现了其液压系统动态仿真和机构的二堆动力学仿真．并采用试验的方式对仿真模型进行验证和改进，对仿真结果和试验结果进行了详细分析和比较，给出试验和仿真曲线，并在AMEViewer中显示仿真模型的运动。所得到的动臂、斗杆和铲斗液压缸无杆腔的压力误差在10bar以内，因此能够实现较精确的工作装置运动仿真，同时也验证了该模型的有效性。     

液压管路动态特性的Simulink仿真研究

研究液压管路的动态特性及其仿真实现方法对液压系统优化设计及其性能分析具有重要的意义。根据包含有动态摩擦项液压管路分段集中参数建模的思想，以功率键舍图推导出的输入势输出势模型为基础，提出应用Matlab软件中的动态仿真工具Simullnk软件包对液压管路的动态特性进行仿真的分析方法，液压冲击实例表明该仿真方法应用于管路的动态分析实用方便；创建的管路模型及得出的仿真结果可为液压集成块和其他液压管网动态特性的研究提供借鉴。     

车载发电液压传动系统的建模与仿真分析

根据某特殊用途电源车研究与开发的需要,针对研发的电源样车车载发电液压传动系统,运用MATLAB/Simulink软件建立了车载发电液压传动系统的仿真模型,并进行了相关的试验;通过试验,验证了车载发电液压传动系统仿真模型的准确性。在此基础上,对该电源样车车载发电液压传动系统的稳定性进行了仿真分析,同时研究了泵控马达调速系统的结构参数和运行参数对系统动态性能的影响。研究结果可以为该电源样车液压传动系统的进一步改进与完善提供一定的依据。     

某型涡扇发动机自动加速器仿真分析

某型涡扇发动机的机械液压控制系统实现了复杂的加速控制规律。为了深入分析该自动加速器特性,使用AMESim和Simulink建立了该自动加速器的联合仿真模型,并验证了仿真模型的正确性,且具有较高的精度。在此基础上分析了影响自动加速器性能的可调部件,仿真结果显示了这些部件的参数调整对自动加速器加速特性曲线的影响。结论为该机械液压控制器的改进改型提供依据。     

基于联合仿真的液力缓速器液压控制系统研究

对某重型车辆的液力缓速器系统进行研究。依据台架试验数据和神经网络理论建立了液力缓速器数学模型。基于AMESim建立了液压控制系统模型。基于MATLAB/Simulink建立整车制动模型和PID控制器模型。通过MATLAB-AMESim联合仿真验证液压控制系统的控制性能。仿真结果表明这套液压控制系统和控制算法具有良好的恒力矩控制性能,与试验结果对比也验证了基于联合仿真的液力缓速器液压控制系统研究方法是具有实用意义的。     

压电喷射点胶系统PID闭环控制仿真分析

介绍了一种新型液压放大压电点胶系统的结构和原理,分析了该系统的喷射过程和喷射条件,结合AMESim仿真软件,搭建了该系统的开环仿真模型,仿真验证了系统结构的可行性.针对开环点胶系统的不足,重点引入PID(比例积分微分)控制算法,构成闭环控制点胶喷射系统,在仿真环境下,对开环和闭环系统的性能进行了对比,分析表明,PID闭环控制可以改进和提高压电喷射点胶系统的性能,在喷嘴直径为0.1mm,胶体腔压强8 bar下,可以得到点胶速度为0.023 L/min、液滴直径为0.8 mm的稳定喷射液滴.     

新型机载一体化电液作动器的系统设计与仿真

设计了一种用于功率电传的新型一体化电动静液压作动器(EHA),分析该EHA的原理和设计特点,进行系统建模,采用MATLAB/Simulink对其进行仿真。分析了结构参数对系统性能的影响,并应用控制算法提高了系统的性能。仿真结果表明所设计的EHA及其控制方法具有良好的动态性能,达到预定的性能指标。     

基于Simulink的机电液系统集成化仿真平台研究

利用多领域软件构建了基于Simulink的机电液一体化系统集成化仿真平台.分析了机电液一体化系统各领域之间的参数关联关系,提出了基于Simulink的集成化仿真平台框架,研究了各软件之间的组织内部协同仿真方法.以液压驱动的大型起竖系统仿真为例验证仿真平台的可行性和有效性,表明该方法能够实现机械,液压、控制系统仿真模型的有机集成,高效、经济、可靠地处理机电液系统非线性建模仿真和优化控制问题,为机电液一体化系统的协同研发搭建一个支撑平台.     

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,     

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     

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,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists