共查询到20条相似文献,搜索用时 140 毫秒
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针对一个阀控对称缸的液压伺服系统,进行了基于SimHydraulics不同控制策略的实物仿真,研究其在不同的控制策略下的动态响应性。通过Simulink数学建模验证基于SimHydraulics的物理建模的可行性,并对仿真结果进行了分析。总结了应用SimHydraulics液压元件库仿真与不同控制策略联合的方法,此方法使得液压伺服系统的设计、控制策略设计可以同时进行,提高了液压系统设计的快速性和控制的稳定性。 相似文献
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介绍了一种八轮车的架构设计,同时运用基于模型的方法设计了整车的控制策略与运动学控制算法。通过对整车控制策略研究,将其模块化,使用MATLAB/Simukink/Stateflow建立仿真模型。运用自动代码生成技术生成可执行的代码,并通过硬件在环试验验证了控制策略与控制算法的正确性。 相似文献
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为解决无人机着陆滑跑短跑道的实际应用问题,设计着陆短距控制策略.以某型有人机改型的无人机为研究对象进行建模分析,设计常规固定翼无人机着陆控制律分析其着陆性能;设计连续襟翼直接力控制下的着陆纵向控制策略,有效地提高了无人机自主着陆的短距性能.通过仿真对比试验可知:该控制策略提高了对象无人机的着陆精度以及低速着陆下的抗风性... 相似文献
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以Stewart运动平台基于正解补偿的控制策略为研究对象,采用线性化方法,对该控制策略进行了简化,得到了基于正解补偿控制的等效控制策略,从而明确了基于正解补偿控制的机理。通过仿真分析,把基于正解补偿控制策略与等效控制策略的仿真结果进行对比,证明了等效模型的正确性。根据理论与仿真分析的结果,该文把基于正解补偿控制器参数设计归结为单系统控制器参数设计,为基于正解补偿控制系统设计提供了理论指导。该文的理论推导与仿真分析可以证明,正解补偿控制策略可以等效还原为基于运动学反解的单系统控制策略,正解补偿控制策略从本质上说只不过是提高了单系统的开环增益,提高的倍教取决干正解补偿因平的大小. 相似文献
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《现代制造技术与装备》2017,(5)
设计了一款1.2L汽油机增程器的多点转速切换控制策略,在Matlab/Simulink搭建控制策略模型,联合Cruise模拟了汽车在NEDC工况下的行驶。通过SOC变化、需求功率、发动机功率及发电效率分析得出,在设计的控制策略下,增程器能够满足功率需求维持电量值,且增程器的发电效率大于70%。 相似文献
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论文首先总结了目前变速恒频双馈风力发电系统通常采用的定子磁链定向、转子磁链定向和气隙磁场定向控制方式的基本控制原理和存在的一些问题。为了解决这些问题,论文依据双PWM变流器的拓扑结构,设计了基于电网电压定向的矢量控制策略,同时,针对转子侧变流器所要实现的功能,设计了基于定子电压定向的矢量控制策略,最后,论文通过仿真,验证了电压定向的矢量控制策略的正确性。 相似文献
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本文首先介绍了最具代表性的Bosch公司的高压共轨系统,据此进行了电控系统的软硬件设计和控制策略设计,通过试验,达到了预期的设计效果。 相似文献
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AutoCAD为平台的作业和考试,需要考虑上交试卷的真实性,可对整卷采取"防串"措施;卷面类型应有不同,各题目也要"防复制".因此,对不同题目的分析和不同处理的方法都是重要的.这些问题解决了,才可构建"试卷库",配之开发的相应程序及菜单文件,进而构成一个实用的"考试系统",才对课程建设起到有价值的意义. 相似文献
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Aiming at the problem that paper smoothness cannot be measured on line, a new method for soft measurement of paper smoothness is put forward on the basis of studying paper quantization distribution. A soft measurement system is established, by which, paper quantization noise is processed by time-frequency analysis and non-linear transformation, so that online paper smoothness can be obtained through a Radial Basis Function Neural Networks (RBFNNs). The results show that this soft computing method is a feasible way with high measuring accuracy. 相似文献
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本文对Saunders法评价剪切图作一讨论,把求解简化为解一个三元一次方程组,并给出两种求解方法。利用本文所给的数据表,可以大大减小计算量使得计算可以借助普通计算器完成。为实际加工检测提供了一种比较实用的方法。 相似文献
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介绍一种新型的键盘显示控制芯片-SK5279A,SK5279A是一种具有串行接口,可同时驱动8位共阴式数码管(或64只独立的LED)的单片显示驱动芯片,它内部带有译码器,具备两种译码方式,可直接接收16进制码,通过软件控制可选择两种译码方式的一种或不译码,此芯片还具有多种控制指令,如显示位数限制、闪烁、左移、右移、段寻址等。SK5279A除具有上述功能外,还可连接多达64健的键盘矩阵,可给出键盘有效信号,并可直接输出键值。并结构简单、编程灵活,可广泛应用于仪器仪表、控制面板等场合,本文将结合实际,具体阐述其应用。 相似文献
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G. Thimm G. A. Britton S. C. Fok 《The International Journal of Advanced Manufacturing Technology》2004,24(3-4):261-271
The purpose of this paper and its companion (Part 2) is to present a rigorous graph theoretic model to link designing with process planning. This paper shows how to generate process plans from design dimension trees. It is the foundation for the companion paper, Part 2, which shows how part dimensioning (during designing) can be guided by knowledge of the datum-hierarchy tree structure underlying process plans. Design dimensions are represented as a design dimension tree, which is the basis for defining an ideal (optimal) datum-hierarchy tree of a process plan. The ideal datum-hierarchy tree, in turn, is used to define measures of process planning efficiency. These measures can be utilised to compare actual process plans and improve manufacturing processes. An example is presented to illustrate the concepts and method. 相似文献
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L. C. Woods 《International Journal of Mechanical Sciences》1960,1(4):313-321
This paper gives a new and more accurate treatment of the theory of rectangular wind tunnels that are ventilated by means of longitudinal slots on one pair of opposite walls. An aerofoil is placed at zero incidence midway between the slotted walls. The cross-flow, which is induced by the slots on the basic two-dimensional flow, is calculated accurately. This permits an averaged boundary condition to be obtained which is more accurate than those previously published.
In the final section of the paper the wake and solid blockage caused by the slotted walls is calculated. Let the slots have a width 2σa and be spaced 2a apart and let the tunnel height be H. Then the theory yields the σ, 2a/H relation for zero blockage without any limit on the ratio 2a/H, which in earlier treatments is required to be small. 相似文献
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5-axis micro milling machine for machining micro parts 总被引:3,自引:3,他引:0
Young-bong Bang Kyung-min Lee Seungryul Oh 《The International Journal of Advanced Manufacturing Technology》2005,25(9-10):888-894
This paper presents a PC-based 5-axis micro milling machine, which can be used for machining micro-sized parts, and be easily constructed a low cost. Micro cutting is a method for manufacturing three-dimensional micro parts; however, machine tools for micro machining are expensive. The micro milling machine presented in this paper is mainly composed of commercially available micro stages, and an air spindle and PC-based control board. An effective method for initializing the spindle position is proposed. Test results of the micro milling machine are presented, which include machining of micro walls, micro columns and micro blades. 相似文献