共查询到19条相似文献,搜索用时 187 毫秒
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电镀锡生产线锡层厚度智能模糊控制系统 总被引:2,自引:2,他引:0
介绍了冷轧厂镀锡线锡层厚度智能模糊控制系统的组成结构、基本控制功能及其技术特点 ,并着重阐述了模糊控制器的原理。系统投运以来 ,取得了良好的控制效果。 相似文献
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介绍了冷轧厂镀锡线锡层厚度智能模糊控制系统的组成结构、基本控制功能及其技术特点,并着重阐述了模糊控制器的原理。系统投运以来,取得了良好的的控制效果。 相似文献
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首先分析水平辊道式玻璃钢化生产线的构成与工艺流程,然后进行控制系统结构设计.钢化玻璃品质控制的关键在于温度控制,因为钢化玻璃电加热炉是一个非线性、时变、大滞后系统.在数学建模的基础上,将增益自适应补偿Smith 算法运用于电加热炉温度控制,取得比传统PID控制更优的控制效果. 相似文献
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利用无模型自适应控制(Model—freeadaptive control,MFAC)方法仅需要被控对象输入和输出数据,而不需要其他任何信息的优点。针对工业生产过程中普遍存在的大时问滞后的特点,提出针对未知模型的大时滞对象的无模型自适应控制改进算法(Improved MFAC on Large Time—delay System,LTDS-IMFAC)。在改进算法中,在基本无模型自适应控制算法的基础上引入了带有滞后时间的输入变化率的约束项.以此来减小大时间滞后对整个控制过程的影响。通过MATLAB仿真试验证明了改进算法对于大时滞系统的控制具有较好的有效性。 相似文献
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本文给出一种模糊人工神经网络控制器(FANNC)作控制机构,用参考模型输出作理想训练目标以及此为基础而建立的广义BP算法作出自适应机构的模型参考自适应模糊人工神经网络控制系统(MRAFANNCS)。真正为一类缺乏精确数学模型的大滞后大惯性对象提供实现自适应控制的有效方法,弥补了一般设计方法的不足,仿真验证了该方法的合理性。 相似文献
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基于酸浸在氰化工艺的重要性,针对加酸后PH反应的大滞后从而导致的控制不够准确及时,以某金矿采用无模型自适应控制技术(MFA)成功实现加酸自动控制为例,介绍了无模型自适应控制在PH+大滞后的系统中强大的控制能力。 相似文献
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冷带轧机厚控系统自适应鲁棒输出反馈动态控制器设计 总被引:5,自引:1,他引:4
冷带轧机厚控系统可被认为是一个受外界干扰的线性不确定时滞系统.本文首先设计了标称系统下的鲁棒输出反馈动态控制器,以改善闭环系统的动静态性能;其次,在系统不需要满足不确定性匹配条件的情况下,将参数和外部扰动不确定性综合考虑.应用Lyapunov稳定性理论设计了系统不确定性上界参数的自适应估计器和系统的自适应控制器,保证了闭环系统的渐近稳定性,减小了设计的保守性;两者结合实现了板带出口厚度的有效控制.最后通过一个仿真实例说明本文所提出的自适应鲁棒控制器的有效性. 相似文献
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On improvement of transient performance in tracking control for a class of nonlinear systems with input saturation 总被引:1,自引:0,他引:1
This paper studies the technique of the composite nonlinear feedback (CNF) control for a class of cascade nonlinear systems with input saturation. The objective of this paper is to improve the transient performance of the closed-loop system by designing a CNF control law such that the output of the system tracks a step input rapidly with small overshoot and at the same time maintains the stability of the whole cascade system. The CNF control law consists of a linear feedback control law and a nonlinear feedback control law. The linear feedback law is designed to yield a closed-loop system with a small damping ratio for a quick response, while the nonlinear feedback law is used to increase the damping ratio of the closed-loop system when the system output approaches the target reference to reduce the overshoot. The result has been successfully demonstrated by numerical and application examples including a flight control system for a fighter aircraft. 相似文献
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龚辉 《自动化技术与应用》2012,31(8):67-70
宝钢股份有限公司冷轧薄板厂镀铬机组采用的是TMEIC公司的窄搭接滚压焊接机,本文介绍了该焊机的焊接原理、过程、工艺参数,摸索出该焊机及控制技术。现场应用效果表明,该焊机自动化程度高,工艺先进,能适应镀铬机组的生产需要。 相似文献
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This paper studies an arbitrary convergence time tracking controller design problem for high-order nonlinear systems. Our aim is to enhance the existing free-will arbitrary time control (FATC), which cannot track time-varying reference signals. To do so, a new nonautonomous equation is firstly introduced to enable an arbitrary settling time stability for one-order systems. Then, a prescribed performance control (PPC) technology is integrated for general high order systems. By a backstepping Lyapunov analysis with iteratively contructed nonautonomous equations, it is proved that the closed-loop system satisfies the prescribed performance and all signals of the closed-loop system are arbitrary settling time stable (ASTS). Compared with the existing results, the tracking control problem with arbitrary convergence time is addressed by a continuous control law, which shows a better transient performance also. Simulation results confirm the effectiveness of the proposed control method. 相似文献
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B. Wayne Bequette 《Annual Reviews in Control》2012,36(2):255-266
Pursuit of a closed-loop artificial pancreas that automatically controls the blood glucose of individuals with type 1 diabetes has intensified during the past 6 years. Here we discuss the recent progress and challenges in the major steps towards a closed-loop system. Continuous insulin infusion pumps have been widely available for over two decades, but “smart pump” technology has made the devices easier to use and more powerful. Continuous glucose monitoring (CGM) technology has improved and the devices are more widely available. A number of approaches are currently under study for fully closed-loop systems; most manipulate only insulin, while others manipulate insulin and glucagon. Algorithms include on–off (for prevention of overnight hypoglycemia), proportional–integral–derivative (PID), model predictive control (MPC) and fuzzy logic based learning control. Meals cause a major “disturbance” to blood glucose, and we discuss techniques that our group has developed to predict when a meal is likely to be consumed and its effect. We further examine both physiology and device-related challenges, including insulin infusion set failure and sensor signal attenuation. Finally, we discuss the next steps required to make a closed-loop artificial pancreas a commercial reality. 相似文献
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为了进一步抑制加速度计信号带宽范围内的噪声,提出并设计了一种基于∑-△M的五阶多反馈谐振式(MFLR)微机械加速度计闭环控制系统,该系统通过增加额外的内部负反馈对量化噪声进行再一次整形.微机械加速度计结构为一种全差分式结构,在结构层厚度为60 μm、基底层厚度为400μm的SOI硅片上,经过光刻、溅射、深度反应离子刻蚀等工艺步骤加工而成.整个闭环控制系统的Matlab/Simulink模型首先被建立,然后采用“单位圆分析法”进行系统参数的设定,系统仿真显示:当输入幅值1gn、频率128Hz的加速度信号时,加速度计的噪声为-136.2 dB,与传统五阶MF结构的∑-△M闭环控制系统相比,在0 ~500 Hz信号带宽范围内的噪声降低了7.9dB.最后整个系统在四层PCB电路板上进行了功能性验证和测试. 相似文献