变频泵控马达调速系统遗传算法PID控制

提出了基于遗传算法的变频泵控马达调速系统的PID参数寻优方法。仿真结果证明了遗传算法寻优后的PID控制器较常规PID控制器具有更好的控制特性，对模型失配和负载扰动表现出更强的适应性和鲁棒性，很适合具有慢时变和存在负载扰动的变频泵控马达调速系统的控制。也指出了用遗传算法寻优变频泵控马达调速系统PID参数的局限性。     

神经网络自适应PID在开关磁阻电机中的应用仿真

介绍了一种基于神经网络的自适应PID控制器,其运用神经网络和BP算法在线调整PID参数,并把此控制器和传统PID控制器组合成一个复合控制器应用于开关磁阻电机调速系统中.仿真结果表明,与传统的数字PID控制器相比,该复合控制器具有更好的自适应性和鲁棒性.     

无刷直流电动机的神经网络PID控制器研究

提出了一种基于BP神经网络的PID控制器,该控制器有机结合了BP神经网络和PID的特点,克服传统PID控制存在的不足,并采用快速BP算法改善其收敛性,有效的提高了无刷直流电动机调速系统性能,仿真研究表明上述神经网络PID控制器,比传统PID控制器控制动态过程有明显改善,能够获得更高的跟踪精度。     

神经网络在直流调速系统中的应用

由于直流电动机的调速特性平滑、简单,启动、制动特性较好,并且能在较大范围内完成精确的速度和位置控制的优点,因此长期以来在调速传动中占主导地位。目前,直流调速系统普遍采用传统的PID控制器,其性能优越,构造简单,具有较好的稳定性及可靠性。但这并不代表传统PID控制器是完美的,其PID参数不易调节、自适应性较弱,这是它不容忽视的缺点。为了提高系统调速性能,本文将神经网络PID控制引入到双闭环直流调速系统中,当系统运行工况发生变化时,BP神经网络能够通过自身自主学习的能力,适时地对PID控制器的三个参数在线整定。通过仿真证实,该调速系统超调量小、动态响应快、调节时间短、稳态准确度高。这表明该方法在直流调速系统中的应用前景是十分光明的。     

基于神经网络的交流电机PID控制系统

将神经网络自身学习的特点和PID控制相结合构成控制算法,以DSP为控制器构建交流电机的控制系统,利用VB编写上位机监控程序进行交流电机变频调速控制研究,实验结果证明了系统响应速度快,抗干扰能力强的特性。     

基于变时滞神经网络的直流电机PID数字调速系统仿真研究

在PID模糊逻辑控制方法中引入变时滞函数,对直流电机的调速系统进行仿真研究。设计的变时滞神经网络用于PID模糊控制器,输入量是电机的转速偏差和转速偏差率,输出量用于控制斩波调速时的导通角,仿真结果表明该调速系统能有效地抑制超调现象,提高系统的响应速度和稳态性能。     

数字PID控制器在升降机调速系统中的应用

数字PID控制器能够快速进行多变量、非线性的信号处理,实时调节工业过程控制中的PID参数,与异步电动机的变频调速系统相结合,完全能够达到直流调速的动、静态性能指标。实践表明,数字PID控制器用于高层建筑施工升降机的调速系统,能够获得良好的效果。     

基于PLC的PID自适应控制器在调速系统中的应用

介绍了由PLC控制实现的神经网络PID自适应控制器。实验表明,该技术对于提高控制精度是行之有效的,具有在调速系统中推广应用的价值。     

基于变频技术的泵控缸液压调速系统的模糊PID控制的仿真研究

首先对变频泵控调速系统进行理论分析,建立了系统的数学模型。针对系统的非线性、变负载等特性,利用模糊PID作为系统的控制方案,设计模糊PID控制器。最后运用Matlab分别对系统的常规PID控制和模糊PID控制进行仿真,对其效果进行验证。     

神经网络与PID结合的直流调速系统自适应控制

提出一种将神经网络理论结合传统PID控制机理 ,构成单神经元PID控制器 ,并应用于直流调速系统。通过在线边学习边控制的方式 ,解决了传统PID的不足 ,实现了调速系统的快速过程实时在线控制要求。仿真结果表明 ,这控制方法具有良好的自适性 ,且系统鲁棒性优于传统双闭环控制。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

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.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

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

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

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....