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1.
参数自整定模糊PID控制恒压供水系统   总被引:4,自引:1,他引:4  
从硬件和软件两方面详述了以89C51单片机作为恒压供水控制系统的核心部件,采用模糊自适应PID参数控制算法构成实用恒压控制系统。通过自动整定PID的参数kP,k1,kD,使PID控制器能够通过改变输出电压来控制执行机构变频调速器的频率,从而使整个供水系统保持给定压力。  相似文献   

2.
针对电子束3D打印温度控制系统,采用自整定模糊PID控制,使用MATLAB模糊逻辑模块及仿真模块建立系统仿真图,通过仿真曲线获得优化参数。结果表明,与模糊控制系统及PID控制系统相比较,自整定模糊PID控制系统在电子束3D打印温度控制系统中具有动态响应快、调整速度快、稳态性能高、超调量小等优点。  相似文献   

3.
液压马达驱动机床主轴系统具有参数时变和高度非线性,传统PID控制器控制精度不高。针对液压马达驱动机床主轴系统速度控制问题,采用模糊自整定PID控制器实现液压马达驱动机床主轴系统的有效控制,并对控制效果进行仿真验证。构造了液压马达驱动机床主轴系统模型简图,建立了液压马达驱动机床主轴系统数学模型。对传统PID控制器参数,用模糊控制器进行实时整定,开发了模糊自整定PID控制器。最后,采用MATLAB对液压马达驱动机床主轴系统进行仿真。同时,与传统PID控制器的计算结果进行对比和分析。仿真结果显示:采用模糊自整定PID控制器的液压马达驱动机床主轴转速超调量小,具有更快的响应时间,跟踪精度高,同时系统能耗减少20%左右;即使受到较大随机干扰,模糊自整定PID控制器也能快速消除干扰,使机床主轴转速处于受控状态。采用模糊自整定PID控制器可以有效提高液压马达驱动机床主轴系统的动态稳定性以及抗干扰能力。  相似文献   

4.
基于模糊理论的PID参数自整定的温度控制仪   总被引:1,自引:0,他引:1  
介绍一种基于模糊理论的PID算法的自整定温度控制仪,给出了PID的温度测控原理,并对模糊控制思想及系统的软、硬件设计进行了详细阐述.采用该控制系统,能较好地克服温度控制对象的纯滞后特性,控制响应时间短,超调小.  相似文献   

5.
基于参数自整定模糊PID控制的抗生素发酵罐温度控制系统   总被引:1,自引:0,他引:1  
针对抗生素发酵过程中的发酵罐温度具有滞后性、非线性以及很难建立精确的数学模型等特性,本控制系统采用参数自整定模糊PID控制算法对发酵罐的温度进行控制,通过MATLAB仿真及实践应用表明,参数自整定模糊PID控制有效地改善了传统PID控制的缺陷,保证了发酵罐温度的精确控制,克服了温度对象时滞特性.同时对参数自整定模糊PID控制算法的三种实现方式进行了论述.  相似文献   

6.
鉴于目前企业、工厂和一些对温度调节精度要求比较高的场合,常规的PID控制器在温度的调控上精度还是远远不够。相比起常规PID控制,改进后的自整定模糊PID算法加入了模糊控制理论,同时可以实现参数的自适应调节。利用算法分析和MATLAB系统仿真得出调节参数,系统再根据反馈回来的数值进行参数整定,实现自适应调节的同时也进一步提高了系统调控数据的精度,最后输出仿真曲线,仿真试验结果表明在不需要系统精确传递函数的同时,基于自整定模糊PID算法下的温度调节控制精度可以压缩至±0.005℃。  相似文献   

7.
针对工业数据模型辨识精度不高及PID不能在线自整定问题,提出一种闭环在线自整定控制策略。控制策略利用递推最小二乘辨识方法获得模型,基于该模型采用改进的遗传算法进行PID自整定,构成闭环在线自整定系统。通过MATLAB中的App designer平台验证了所提方法的可行性和有效性。仿真结果表明:辨识得到传递函数可以很好地拟合跟踪工业数据,PID自整定参数闭环阶跃响应控制效果良好。  相似文献   

8.
火电厂主汽温控制系统具有大惯性、大延迟和时变等特性,采用常规PID串级控制方法难以获得满意的控制效果。通过引入1/1pade级数逼近纯滞后环节,将内模控制转换为常规PID控制器的参数的整定,运用变论域模糊控制原理来整定PID参数,从而实现了变论域模糊自整定PID内模控制。它充分综合了变论域模糊控制、内模控制、PID控制的优点。通过对锅炉过热蒸汽温度控制系统的仿真研究表明,变论域模糊自整定PID内模控制的控制效果优于常规的PID串级控制,它能适应对象参数的变化,具有较强的鲁棒性和自适应能力,控制品质好。  相似文献   

9.
LABVIEW是一种图形化编程语言,提供了虚拟仪器便捷的设计环境。将模糊控制与PID相结合,在LABVIEW中实现模糊自整定PID控制器,并将其作为外挂控制器通过MODBUS协议和新华仿真系统XDPS进行通信连接,最终实现外挂模糊自整定PID控制器对XDPS中主蒸汽温度系统的控制。对比XDPS中传统PID控制策略,仿真结果说明,模糊自整定PID控制时,系统的超调量和调节时间较小,外挂控制器和XDPS中传统PID的切换控制,使系统在安全稳定运行的同时又得到实时优化,满足现场实施要求,具有良好的应用前景。  相似文献   

10.
通过分析主汽温调节对象的动静态特性,得出该控制系统的设计原则,从而用Z-N整定方法设计出PID控制器的控制参数,结果证明用Z-N整定方法整定的PID控制器对主蒸汽温度具有良好的控制效果,可见Z-N整定能很好的应用于主蒸汽温度控制系统中。  相似文献   

11.
An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...  相似文献   

12.
The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.  相似文献   

13.
Giannuzzi LA  Utlaut M 《Ultramicroscopy》2011,111(11):1564-1573
30 keV Ga+ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z2, and shows a non-monotonic relationship between contrast and Z2. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z2, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.  相似文献   

14.
The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...  相似文献   

15.
The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....  相似文献   

16.
This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...  相似文献   

17.
分布动态载荷识别的抗噪处理   总被引:2,自引:2,他引:0  
针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.  相似文献   

18.
针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。  相似文献   

19.
Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.  相似文献   

20.
A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.  相似文献   

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