共查询到20条相似文献,搜索用时 78 毫秒
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本文介绍了 BP神经网络 ,并通过实验分别研究讨论了初始权值、阈值、学习率以及隐层层数等对网络收敛速度的影响 ,给出了实验数据 ,对如何选取网络结构及参数有着积极的指导意义 相似文献
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无速度传感器矢量控制系统速度估算新方法 总被引:1,自引:0,他引:1
介绍了一种简单易行的速度估算策略,给出了无速度传感器矢量控制系统的原理结构图,并针对系统的物理模型进行仿真论证,仿真结果证明了方案的可行性,同时给出了电压信息处理的方法。 相似文献
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本文对双边截断型分布族中参数θ及其可微函数构造了 EB 估计,在不同的条件下,分别求出了收敛速度,最后给出一个例子说明定理的合理性。 相似文献
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单晶炉提拉速度控制系统的设计与分析 总被引:4,自引:0,他引:4
在单晶硅生产过程中,对单晶硅提度有十分严格的要求,针对实际情况,本文设计并分析了一种实用的,在极低转速下实现无级调速的控制系统。用该系统来控制提拉机械,具有结构简单、造价低的特点,实测表明,系统的性能测量生产要求,现已投入批生产。 相似文献
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链式炮是一种安装在武斗直升机上的空对地航炮,是现代武斗机常用的武器装备,本次设计是链式炮射击速度控制系统的硬件和软件,经联试实验符合设计要求,该系统的研制在国内尚属首次。 相似文献
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一种实用的单晶炉提拉速度控制系统 总被引:1,自引:0,他引:1
文章提出了一种实用的单晶炉提拉速度控制系统。该系统结构简单、造价低。实测表明,系统的性能满足生产要求,现已获得成功应用并投入批量生产。 相似文献
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在当今水泥生产行业,新型干法制造工艺的应用已越来越普遍,随之而来的工业控制手段也越来越先进,自动化程度也越来越高。 相似文献
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Edi Kurniawan Hai Wang Bernadus H. Sirenden Jalu A. Prakosa Hendra Adinanta Suryadi Suryadi 《International Journal of Adaptive Control and Signal Processing》2021,35(11):2245-2258
This article presents a design strategy and stability analysis of modified repetitive sliding mode controller for uncertain linear systems. A modified repetitive controller is adopted to simultaneously track and reject periodic signals. A discrete-time sliding mode controller is combined to compensate the slow response of repetitive control and to provide robustness against plant parameters uncertainties. Stability analysis is provided to prove boundedness of the proposed control law and the convergence of sliding function and the tracking error. Comparative simulation results demonstrate that the proposed method is able to accurately track reference signal and to reject disturbance with fast transient response. The results also indicate that the closed-loop system remains stable in the presence of plant parameter changes. 相似文献
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Induction motors are robust and inexpensive machines and are used widely for variable speed control because of the recent development of electronic technique. In the case where loads of the motors are compressors, pumps, and so on, the constant V/F control of the induction motors usually is employed because it is difficult to install speed sensors and accurate speed control is not required. In such loads, the rotational speed of the motors fluctuates considerably because the load torque is pulsated. When the frequency of the torque pulsation is close to the resonant frequency of the mechanical system, large vibration and acoustic noise are produced especially in the low-frequency region. This paper proposes a method to suppress the variation of the rotational speed of the V/F controlled induction motor with a fluctuated load by feedforward compensation using a timing sensor of 1 pulse/rev, considering that the load torque varies periodically. The feedforward data by a period for the compensation is obtained by the learning control based on the repetitive control in which the motor speed is controlled by periodically reflecting the past speed error on the present V/F input to the inverter. Effectiveness of the proposed method is confirmed by approximate analysis, simulations and experiments. 相似文献
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In this note the effect of the adaptation gains on the rate at which a repetitive control law forces an error to zero is presented. Once determined, a design procedure is suggested for how to choose the gains for the repetitive control law. © 1997 by John Wiley & Sons, Ltd. 相似文献
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本串级调速系统在工业控制领域里占据着重要的位置,特别是在异步电机调速领域。传统的控制系统采用单片机作为控制元件,但是由于单片机自身的易损坏性和抗干扰能力差的特性,使其在工作环境恶劣时容易使控制系统不稳定甚至遭到破坏。PLC由于其抗干扰能力强和易于编程等特性,在电机调速领域迅速得到了广泛应用,本文将重点论述PLC控制系统在电机全速状态下发生故障时所采取的相关操作以显示PLC控制系统的优质特性。 相似文献
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H. Dang D.H. Owens 《International Journal of Adaptive Control and Signal Processing》2006,20(9):409-429
This paper presents a simple adaptive multi‐periodic repetitive control scheme when the MIMO LTI plant is not necessarily positive real (PR), however it is strictly minimum‐phase, the spectrum of high‐frequency gain matrix CB is symmetric and lies in the open right/left half complex plane(sign/spectrum definite). The non‐identifier‐based direct adaptive control technique, which does not need plant parameter information, is used to construct adaptive schemes and the system stability is analysed by Lyapunov second method. The extension to plant under certain non‐linear perturbations and an exponential stability scheme are also discussed. Finally, an adaptive proportional plus multi‐periodic repetitive control scheme is proposed. The theoretical findings are supported with simulations. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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叙述了汽轮机调节保安系统液压油的使用现状,分析并阐述了汽轮机油及EHC抗燃油的特性、质量标准及在生产应用中存在的问题和对机组安全运行的影响,详细分析了产生油液污染主要原因,制定了防止污染发生的技术防范措施. 相似文献
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设计了一种无刷直流电动机BLDCM(BrushLess DC Motor)无速度传感器变频调速系统.以数字信号处理器DSP(Digital Signal Processor)为数字控制器、智能功率模块IPM(Intelligent PowerModule)为功率逆变器组成硬件系统,采用反电势过零检测法进行电子换向,实现了BLDCM的无速度传感器转速跟踪.介绍了功率驱动主电路,交、直流变换部分采用单相桥式不控整流电路,以提高逆变电路所需的直流电压.通过检测关断相的反电势过零点来获得转子的位置信号,以控制绕组电流的切换,驱动电动机运转.论述了转速与电流反馈信号的检测.使用T法测转速;采用霍尔电流传感器检测直流侧母线电流;系统中转速和电流均由PID控制器进行调节.控制系统软件由主程序和中断程序组成,给出了系统软件的流程图.实验结果表明,系统调速性能良好. 相似文献