基于FUZZY-PID控制方法在温度控制中的应用

本文根据传统PID控制技术，结合模糊控制理论，设计出模糊PID控制器，并用来完成在复杂系统中的温度控制。详细分析了PID参数整定设计方案，模糊PID控制器结构原理和设计方法，控制规则库的推理过程；利用MATLAB中的SIMULINK和FUZZY工具箱进行了仿真研究，仿真结果表明，FUZZY—PID控制比常规PID控制效果好，仿真结果比较理想。     

Fuzzy-PID复合控制在磨矿过程上的应用研究

把Fuzzy控制技术与PID控制技术相结合,开发Fuzzy-PID复合控制器,实现磨机在不同负载下Fuzzy与PID控制系统的自动转换.实践结果表明,该控制器对过程具有很强的适应性和鲁棒性,适用于磨矿过程,并能提高磨机的效率.     

模糊-PID控制在SVG中的应用

提出了一种采用模糊-PID（Fuzzy-PID）控制的SVG无功补偿控制器的设计方法。用PSCAD软件对系统进行了仿真,仿真结果表明,利用Fuzzy-PID控制器控制静止无功发生器的无功电流具有可行性与有效性。     

脉冲燃烧技术在太钢步进式加热炉中的应用

本文针对太钢1549mm热连轧厂四座板坯加热炉采用脉冲燃烧技术的特点,设计了基于模糊PID控制理论的数字化燃烧控制系统。通过控制每个烧嘴的开关时间,达到控制燃料和空气给进量从而控制炉温的目的。模糊逻辑控制器以PID控制器为基础,控制动作由常规PID实现。模糊控制程序块根据输入变量的变化,以系统观测、专家经验和操作方法为依据,进行模糊推理后做出决策,在线整定PID参数Kp和Ki。该控制系统投运后,具有动态性能好、控制温度波动小、节约燃料等优点,取得了良好的使用效果。     

可逆冷连轧监控AGC算法的研究

可逆冷连轧机系统中的监控AGC是纯滞后环节,用常规PID控制器,很难满足系统要求.利用RBF神经网络对PID控制器的参数进行自整定,在一定程度上增强了系统的鲁棒性,把基于RBF神经网络的智能PID控制器与Smith预估器相结合,对监控AGC系统进行控制,起到了很好的效果.     

Fuzzy-PID控制器在PCS7和MATLAB中的设计比较

以温度为控制对象,分别在PCS 7和MATLAB中设计了Fuzzy-PID控制器。前者利用CFC编程实现,后者借助OPC技术和Fuzzy Logic Toolbox工具箱实现。通过比较,发现Fuzzy-PID控制器在MATLAB中的设计具有编程简单、容易修改模糊规则的特点,适于在实际工业领域中推广应用。     

液压弯辊系统的自适应模糊神经网络控制

 液压弯辊系统具有时变、非线性、外界干扰严重等特点，难以建立精确的用于控制的数学模型。针对该问题，在预先设计了一个PID控制器的基础上，用模糊神经网络设计了一种具有自适应能力的控制器。仿真实验表明，同常规PID控制器相比，该控制器可以克服弯辊系统的参数改变对控制性能的影响，极大地提高了系统的抗干扰能力，降低了控制系统性能对弯辊系统解析模型精度的依赖程度。结果证明该控制方法对于弯辊系统的控制是有效的。     

3-RPS并联机器人位置分析及控制仿真

应用坐标变换法和封闭解法,基于3-RPS并联机器人位置分析,采用Matlab建立3-RPS型并联机器人仿真模型,给定不同状态下的参考输入,通过合理设置PID控制器各项参数进行运动学仿真比较.仿真结果表明：在不同的参考输入的条件下,动平台的位置变化几乎相同,实现了PID控制调平作用,驱动杆实际输出与参考值的偏差在允许范围内波动,控制效果明显,为研究基于并联机器人自动调平提供参考.     

基于模糊推理的自适应PID控制器研究

针对常规PID控制器当控制对象变化时,控制器的参数难以在线自动调整,难以很好地控制非线性、时变的复杂系统和模型不清楚的系统,介绍了一种基于模糊控制原理的自适应PID控制器,同时利用MATLAB中的Simulink和Fuzzylogic工具箱进行了仿真研究,仿真结果具有令人满意的动、静态特性。     

中厚板轧机自动厚度控制系统的鲁棒性研究

中厚板轧机液压厚度控制系统是一个具有抗扰性的控制系统,但系统响应速度过慢,轧机出口有较大厚度偏差。基于传递函数理论,建立了液压AGC系统的动态数学模型,对带有常规PID控制器和模糊自校正PID控制器的厚度控制系统进行了仿真研究。仿真结果表明,模糊自校正PID控制器具有更好的控制效果,系统具有更强的鲁棒性。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.