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Proceedings of IEEE International Conference on Industrial Technology 2000 (IEEE Cat. No.00TH8482)最新文献

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High current regulated, variable DC power supplies for simulating power transients expected in nuclear reactors 用于模拟核反应堆电力瞬变的大电流稳压可变直流电源
R. D. Kulkarni, D.S. Bisht, P. K. Bhaumik, H. P. Vyas, Ranjan Sinha
The paper highlights the design and control of DC power supplies used for direct heating applications in the experimental facilities for simulating various kinds of power transients like reactor decay power curve, loss of coolant accident, reactor setback and stepback patterns, etc. expected in nuclear reactors. High current regulated thyristor controlled DC power supplies designed have superior response than those of power transients. The DC power has been controlled by using programmable ramp generator which generates the reference voltage proportional to the square root of power and feeds to the control circuit of the power supply for simulating the power transients precisely.
本文重点介绍了实验设施中用于直接加热的直流电源的设计和控制,以模拟核反应堆中可能出现的各种功率瞬态,如反应堆衰变功率曲线、冷却剂损失事故、反应堆挫折和后退模式等。所设计的大电流稳压晶闸管控制的直流电源具有比电源瞬态响应更好的特点。采用可编程斜坡发生器控制直流电源,产生与功率平方根成正比的参考电压,并馈送到电源控制电路,以精确模拟电源瞬态。
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引用次数: 9
Fuzzy logic control of a hydraulic system 液压系统的模糊控制
R. Rahbari, C. D. de Silva
This paper presents the implementation of a fuzzy logic controller on an automated machine for mechanical processing of salmon. The prototype machine, as developed in The Industrial Automation Laboratory, is an innovative and automated version of a fish cutting machine. It is able to considerably reduce wastage of fish meat during processing, by automatically adjusting the position of the blade of the cutter with respect to the fish that is being processed. The machine consists of an intermittent-motion conveyor system to move the fish forward, a pneumatically activated guillotine-type blade that operates in the vertical direction, an X-Y horizontal table which carries the cutting blade assembly and is driven by two hydraulic actuators, and a digital CCD camera that takes the image of a fish for geometric sensing before it is cut. A Proportional-plus-derivative (PD) type fuzzy logic controller is developed and implemented successfully for driving the cutter assembly. The performance of the fuzzy logic controller is investigated, with respect to the control specifications for the machine. The real time controller operates in sampling periods of 1 ms; consequently, the membership functions are designed so that only four rules are fired at each sampling period, thereby enabling real time processing. Processing stability of the controller may be adjusted by 9 central rules. Criteria for choosing the membership functions of inputs and output are discussed.
本文介绍了模糊控制器在三文鱼机械加工自动化机上的实现。在工业自动化实验室开发的原型机是一种创新和自动化的鱼切机版本。它能够在加工过程中通过自动调整刀具刀片的位置,相对于正在加工的鱼,大大减少鱼肉的浪费。该机器包括一个间歇运动输送系统,用于移动鱼,一个气动启动的断头台式刀片,在垂直方向上工作,一个X-Y水平工作台,携带切割刀片组件,由两个液压致动器驱动,以及一个数字CCD相机,在切割前拍摄鱼的图像进行几何传感。研制并成功实现了一种比例加导数(PD)型模糊控制器,用于刀具装配的驱动。根据机床的控制要求,对模糊控制器的性能进行了研究。实时控制器的采样周期为1ms;因此,成员函数被设计成在每个采样周期只触发四条规则,从而实现实时处理。控制器的处理稳定性可通过9条中心规则进行调节。讨论了选择输入和输出隶属函数的准则。
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引用次数: 10
Design and analysis of electro optic sensor by finite element method 电光传感器的有限元设计与分析
S. Laskar, P. Dutta, S. Sen
The paper presents design, development, and analysis of electro-optic sensor by using FEM. The electro-optic effect (Pockels effect) has been used for measurement of voltage of variable frequency where a lithium-niobate crystal, sandwiched between electrodes undergoes a change in its refractive index when subjected to applied voltage. Change in refractive index is converted to a corresponding change in intensity using polarimetric method to facilitate on line measurement. The intensity of the output light transmitted through the crystal changes as a function of the applied voltage. Therefore output voltage of the detector gives a measure of the voltage applied. Experimental work has been carried out to study the effect of sinusoidal and also pulse used as voltage sensor or field sensor with high and low applied voltage. Multielectrode configuration forms the basic structure of an electro-optic A/D converter where number of electrode is equal to the number of bits of the A/D converter. The nonlinearity of the electro-optic sensor is found as +0.97%. The maximum applied voltage is 150 V and the sensitivity is (0.02-0.04) volt/volt.
本文采用有限元法对电光传感器进行了设计、开发和分析。电光效应(Pockels效应)已被用于测量频率可变的电压,其中夹在电极之间的铌酸锂晶体在施加电压时经历折射率的变化。利用偏振法将折射率的变化转换为相应的强度变化,以方便在线测量。通过晶体的输出光的强度随施加电压的变化而变化。因此,检测器的输出电压给出了施加电压的度量。实验研究了正弦和脉冲在高、低外加电压下用作电压传感器或场传感器的效果。多电极配置构成了电光A/D转换器的基本结构,其中电极数等于A/D转换器的位数。电光传感器的非线性系数为+0.97%。最大施加电压为150v,灵敏度为(0.02-0.04)伏/伏。
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引用次数: 1
Multi-sensor data fusion strategies for real-time application in test and evaluation of rockets/missiles system 多传感器数据融合策略在火箭/导弹系统测试与评估中的实时应用
P. Banerjee, R. Appavu Raj
In this paper various aspects of a typical flight test range are highlighted. Specifically tracking, sensor fusion and safety related aspects are briefly discussed. A hierarchical multi-sensor data fusion strategy is presented. A typical result using Kalman filter-fusion filter for this scheme is given.
本文重点介绍了一个典型飞行试验靶场的各个方面。具体地,跟踪,传感器融合和安全相关方面进行了简要的讨论。提出了一种分层多传感器数据融合策略。给出了卡尔曼滤波-融合滤波的典型结果。
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引用次数: 7
Intelligent processing of time series using neuro-fuzzy adaptive genetic approach 基于神经模糊自适应遗传方法的时间序列智能处理
A. K. Palit, D. Popovic
An intelligent approach is proposed for processing of time series based on a neuro-fuzzy network and an adaptive genetic algorithm (AGA). A chaotic time series data is used for network training because the trained network should be applied for forecasting of chaotic time series. A simple technique is used to measure the convergence speed of the GA, which in turn determines the probability values of genetic operators in each generation. Using the adaptive versions of probability values of genetic operators the modified GA version has improved its convergence towards the desired fitness function. As the accuracy measure of the forecast the performance indices such as sum square error (SSE), mean square error (MSE), and mean absolute error (MAE) are used. It was shown that the proposed intelligent approach is an excellent tool for forecasting the chaotic time series.
提出了一种基于神经模糊网络和自适应遗传算法的时间序列智能处理方法。使用混沌时间序列数据进行网络训练是因为训练后的网络需要用于混沌时间序列的预测。采用一种简单的技术来测量遗传算法的收敛速度,从而确定每一代遗传算子的概率值。利用遗传算子概率值的自适应版本,改进的遗传算法提高了对期望适应度函数的收敛性。采用平方和误差(sum square error, SSE)、均方误差(mean square error, MSE)和平均绝对误差(mean absolute error, MAE)等性能指标作为预测精度的度量。结果表明,该方法是预测混沌时间序列的一种有效工具。
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引用次数: 7
An intelligent micro-fluidic system for drug delivery 一种智能微流体给药系统
F. Tay, W. O. Choong, Haifeng Liu, G. L. Xu
This paper describes the development and characterization of a micro-fluidic system which comprises of a micro-pump, passive micro-valve and its control circuit. Some applications for such a system include micro-coolant systems, micro-chemical analysis systems and fluid handling systems. Micro-fluidic systems are generally application specific and the focus of the proposed system is for drug delivery. The micro-pump is of the reciprocating membrane type and is based on piezoelectric actuation. It can be manufactured using MEMS fabrication technology such as silicon micro-machining. The pump utilizes check valves made of photosensitive polyimide as the rectifying unit and a O10 mm piezoelectric diaphragm as the actuator unit. The theoretical analysis for the actuator and valve characteristics is presented in this paper. The resulting effects on the flow characteristics and performance are also presented. Results obtained from experiments are also described. Based on these characteristics, a controller circuit is designed and fabricated. The controller uses a single-chip-computer as the processor unit. A liquid crystal display (LCD) is used to display the pump status and settings. The driver is powered by dry cells and it can provide a 200 V square wave input for the pump by utilizing a built-in transformer and regulator circuit. There are two modes of control, namely, frequency and voltage driving to control the pump performance characteristics such as flow rate and pump head. For this system, a maximum pump head and pump rate of 3.28 mH/sub 2/O and 900 /spl mu/L/min respectively are obtained.
本文介绍了一种由微泵、无源微阀及其控制电路组成的微流体系统的研制和特性。这种系统的一些应用包括微冷却剂系统、微化学分析系统和流体处理系统。微流体系统通常是特定应用的,所提出的系统的重点是药物输送。该微型泵为往复膜式,基于压电驱动。可采用硅微加工等MEMS制造技术制造。该泵采用光敏聚酰亚胺制成的止回阀作为整流单元,O10毫米压电隔膜作为致动器单元。本文对执行机构和阀门的特性进行了理论分析。分析了其对流动特性和性能的影响。文中还叙述了实验结果。根据这些特点,设计并制作了控制电路。该控制器采用单片机作为处理器单元。液晶显示器(LCD)用于显示泵的状态和设置。驱动器由干电池供电,利用内置的变压器和调节电路,可以为泵提供200v的方波输入。有两种控制方式,即频率和电压驱动,以控制泵的流量和泵扬程等性能特性。该系统的最大泵扬程和泵流量分别为3.28 mH/sub 2/O和900 /spl mu/L/min。
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引用次数: 5
Nonlinear optimal control: principle of local optimality 非线性最优控制:局部最优原理
Hayase, T. Yamazaki, E. Rijanto
In this paper, it is shown that a nonlinear regulator constructed by using a state-dependent Riccati equation (SDRE) is a local optimal solution of the original optimal control problem. In order to prove this fact, the conventional methods-Lagrange multiplier method, minimum principle and dynamic programming are used-and an idea of the principle of local optimality is introduced by modifying the principle of optimality of dynamic programming.
本文证明了用状态相关Riccati方程(SDRE)构造的非线性调节器是原最优控制问题的局部最优解。为了证明这一事实,利用了拉格朗日乘子法、最小值原理和动态规划等传统方法,并通过对动态规划最优性原理的修改,引入了局部最优性原理的思想。
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引用次数: 2
Genetic evolution of neural network based on a new three-parents crossover operator 基于三亲交叉算子的神经网络遗传进化
A. Srivastava, S. K. Srivastava, K. Shukla
Among the emerging technologies nowadays, the genetic algorithm, a powerful optimization technique, is becoming the subject of new craze among neural network researchers. Genetic algorithms (GAs) for training and designing artificial neural networks (ANNs) have proved to be a useful integration. This paper reports an improvement over earlier work on the genetic evolution of neural network weights using the two-parents multipoint restricted crossover (Double-MRX) operator proposed by Srivastava, Shukla and Srivastava (Microelectronics Journal, vol. 29, no. 11, p.921-31, 1998). In this research, a methodology to improve network convergence is presented by introducing a new concept contrary to natural law, i.e. crossover with randomly selected multiple crossover sites restricted to lie within individual weight boundaries, hence termed as Triple-MRN. In GAs, the search strategy relies more on exchange of information between individual building blocks by exploiting crossover operator. The use of Triple-MRX promotes cooperation among individuals, that better exploits the new genotypic information contained in genome variation. This ensures a much more effective search, both in terms of quality of the solution and speed of convergence as shown by the simulation experiments. Fitness function used in the authors' study is 1/MSE (mean square error). The effectiveness of the proposed technique is tested by evaluating the capability of neural network to learn a real-world gas identification problem.
在当今的新兴技术中,遗传算法作为一种强大的优化技术,正成为神经网络研究人员的新热点。遗传算法(GAs)用于训练和设计人工神经网络(ann)已被证明是一种有用的集成方法。本文报道了使用由Srivastava, Shukla和Srivastava提出的双亲多点限制交叉(Double-MRX)算子对神经网络权重遗传进化的早期工作的改进(微电子学杂志,vol. 29, no. 29)。11,第921-31页,1998)。在本研究中,通过引入一个与自然规律相反的新概念,即随机选择多个限制在单个权重边界内的交叉点进行交叉,提出了一种提高网络收敛性的方法,因此称为Triple-MRN。在GAs中,搜索策略更多地依赖于利用交叉算子在单个构建块之间进行信息交换。Triple-MRX的使用促进了个体之间的合作,从而更好地利用基因组变异中包含的新基因型信息。这确保了更有效的搜索,无论是在解的质量和收敛速度方面,如仿真实验所示。本文采用的适应度函数为1/MSE(均方误差)。通过评估神经网络学习实际气体识别问题的能力,验证了该技术的有效性。
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引用次数: 1
An improved performance resonant AC-DC converter 一种改进型谐振AC-DC变换器
C. Chakraborty, M. Ishida, T. Hori
The performance of a CLL type resonant AC/DC converter has been presented in this paper. It has been shown that, within the desired load range, the converter operates in the lagging power factor mode. A new control scheme to control the output DC voltage and to shape the input AC current is developed. The controller is practically implemented and a major improvement in the input current waveform has been noted.
本文介绍了一种CLL型谐振AC/DC变换器的性能。结果表明,在期望的负载范围内,变换器工作在滞后功率因数模式下。提出了一种控制输出直流电压和塑造输入交流电流的新控制方案。该控制器已实际实现,并且在输入电流波形方面有了重大改进。
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引用次数: 0
Developing an experimental mobile robot-ROVEL 研制一种实验性移动机器人rovel
N. Costa, C. Neves, M. Crisostomo, P. Coimbra
Building an experimental autonomous vehicle or robot, which has the ability to perform in real environments is both a technical and scientific challenge and demands the development of systems for perception, modelling, planning and navigation. Within this scope, this paper describes the construction of a low cost mobile autonomous robot, intended for educational and research purposes. The work presented in this communication describes the mechanical structure of the vehicle, the electronic modules developed and the software modules implemented for the control and remote navigation.
制造一辆能够在真实环境中运行的实验性自动驾驶汽车或机器人,既是一项技术挑战,也是一项科学挑战,需要开发感知、建模、规划和导航系统。在此范围内,本文描述了一种低成本移动自主机器人的构建,旨在用于教育和研究目的。本文介绍了车辆的机械结构、开发的电子模块和实现的控制和远程导航软件模块。
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引用次数: 0
期刊
Proceedings of IEEE International Conference on Industrial Technology 2000 (IEEE Cat. No.00TH8482)
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