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介绍了汽车转向系统路感的实现方法和线控转向系统结构,并在对车辆动力学分析的基础上,利用键合图理论对汽车线控转向系统的路感进行了研究.在20-sim键合图仿真软件中给出了线控转向系统键合图模型,利用键合图理论对电机电流和路感进行仿真分析,最后利用执行电机电流反馈方法得到较为理想的路感. 相似文献
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基于Web的键合图法MEMS系统级多能量域仿真平台 总被引:4,自引:1,他引:4
通过对MEMS系统级仿真方法的研究,讨论了运用键合图法进行MEMS系统级多能量域仿真的可行性,提出了一种采用键合图/模拟框图混合表示进行MEMS动特性仿真的方法,并在该方法的基础上开发了一套基于功率键合图的MEMS系统级多能量域仿真软件平台“xi_Bond。同时一个基于键合图多通口场与结型结构的微元件库(包括梁、质量块、连接点、静电叉指等微元件)也在该仿真平台上得以实现,从而更好的支持了MEMS“Top Down”设计流程,并为系统快速建模提供了方便。最后通过一个多能量域MEMS系统仿真实例对该平台的有效性进行了验证。 相似文献
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基于集成CAD、CAE与可视化技术的虚拟样机技术,提出一种刚柔耦合系统动力学建模与仿真的方法.根据刚柔耦合动力学方程,建立计及刚体运动与弹性变形的系统虚拟样机.对于运动副间隙、摩擦力以及制造误差引起的建模与仿真误差,通过对比试验结果选择系统特征参数为修正因子进行调整,从而补偿以上因素对建模和仿真精度的影响.利用三维实体建模技术、有限元技术以及多体动力学分析,依照虚拟样机仿真和试验的建模仿真流程,完成了曲柄滑块机构的刚柔耦合动力学仿真实例.与试验对比结果表明建模方法和仿真流程的有效性和实用性. 相似文献
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基于ADAMS的动力减振镗杆径向跳动频域分析及参数优化 总被引:2,自引:0,他引:2
采用内置式动力减振的结构来增加镗杆的动刚度,并根据内置式动力减振镗杆的结构及振动特点,利用ADAMS和ANSYS软件联合建立了减振系统的多柔体动力学模型.在此基础上,分析了模型中的弹簧刚度系数和粘性阻尼系数对刀刃径向跳动量的影响.虚拟仿真结果验证了初始设计的可行性,确立了在物理样机设计中需要考虑的要点.同时以减小刀刃径向跳动量在整个频域内响应的最大值为目标对动力减振镗杆虚拟样机进行仿真优化分析,得出了减振系统的最优参数.仿真试验表明:系统的频域响应得到了改善.为进一步的减振系统结构优化设计提供了设计依据. 相似文献
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基于虚拟样机技术进行了飞行仿真转台及其控制器的设计.考虑到非线性、摩擦以及机械系统的柔性特性利用ADAMs进行具有复杂特性的虚拟样机建模.采用Solidworks进行机械部分的建立并导入ADAMS中,使机械设计和虚拟样机设计连贯有序.提出了利用虚拟样机技术代替通常的数学模型进行控制器设计及仿真实验的方案,使设计与实验结果与实际系统更加贴近.基于虚拟样机技术在更接近实际的情况下对控制性能进行检验.并且,控制器的设计可以在实际样机生产之前开始,提高了设计效率.以某单轴转台为例,详细介绍了该控制器设计及校验方法.联合仿真结果证明了方案的合理性. 相似文献
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Lü Min 《系统工程与电子技术(英文版)》2008,19(3)
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. 相似文献
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A calculus for services innovation 总被引:1,自引:1,他引:0
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, 相似文献
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论生物系统中的功能不守恒性 总被引:1,自引:0,他引:1
张知彬 《复杂系统与复杂性科学》2004,1(2):43-51
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。 相似文献
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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. 相似文献
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李弋 《系统工程理论与实践》2011,(Z2):70-74
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. 相似文献
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金工工艺的优化设计 总被引:2,自引:0,他引:2
邹庆化 《系统工程理论与实践》1996,10(11):106-112
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。 相似文献
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《系统工程理论与实践》2014,(4)
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 相似文献