Model predictive control of a rotary cement kiln

A first principles model of a cement kiln is used to control and optimize the burning of clinker in the cement production process. The model considers heat transfer between a gas and a feed state via convection and radiation. Furthermore, it contains effects such as chemical reactions, feed transport, energy losses and energy input. A model predictive controller is used to stabilize a temperature profile along the rotary kiln, guarantee good combustion conditions and maximize production. Moving horizon estimation was used for online estimation of selected model parameters and unmeasured states. Results from the pilot site are presented.     

Design of optimized fuzzy cascade controllers by means of Hierarchical Fair Competition-based Genetic Algorithms

In this study, we present a design of an optimized fuzzy cascade controller based on Hierarchical Fair Competition-based Genetic Algorithms (HFCGA) for a rotary inverted pendulum system. In this system, one controls the movement of a pendulum through the adjustment of a rotating arm. The objective is to control the position of the rotating arm and to make the pendulum maintain the unstable equilibrium point at vertical position. To control the system, we design a fuzzy cascade controller scheme which consists of two fuzzy controllers arrange in a cascaded topology. The parameters of the controller are optimized by means of the HFCGA algorithm. The fuzzy cascade scheme comprises two controllers located in two loops. An inner loop controller governs the position of the rotating arm while an outer controller modifies a set point of the inner controller implied by the changes of the angle of pendulum. The HFCGA being a computationally effective scheme of the Parallel Genetic Algorithm (PGA) has been developed to eliminate an effect of premature convergence encountered in Serial Genetic Algorithms (SGA). It has emerged as an effective optimization vehicle to deal with very large search spaces. A comparative analysis involving computing simulations and practical experiment demonstrates that the proposed HFCGA based fuzzy cascade controller comes with superb performance in comparison with the conventional Linear Quadratic Regulator (LQR) controller as well as HFCGA-based PD cascade controller.     

造纸厂负荷优化调度系统

以造纸厂生产实际为背景,给出了间隙式生产设备－蒸球优化调度的方法。仿真结果表明,该方法在满足纸浆实际需要的前提下,可以节能降耗。     

Vibration control of load for rotary crane system using neural network with GA-based training

A neuro-controller for vibration control of load in a rotary crane system is proposed involving the rotation about the vertical axis only. As in a nonholonomic system, the vibration control method using a static continuous state feedback cannot stabilize the load swing. It is necessary to design a time-varying feedback controller or a discontinuous feedback controller. We propose a simple three-layered neural network as a controller (NC) with genetic algorithm-based (GA-based) training in order to control load swing suppression for the rotary crane system. The NC is trained by a real-coded GA, which substantially simplifies the design of the controller. It appeared that a control scheme with performance comparable to conventional methods can be obtained by a relatively simple approach. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Collision-based flexible image encryption algorithm

This paper presents a novel image encryption algorithm, which is flexible to encrypt digital images with different precisions. The algorithm is construct from three collision-based dynamical systems: Hardy-Pomeau-Pazzis (HPP) model, rotary element (RE) model and billiard-particle model. Both the HPP and RE model are efficient and can support parallel computing; the billiard-particle is an excellent model for round key expansion. These models are revised to best suits image encryption. Analyses and simulations demonstrate that the proposed algorithm has satisfactory properties of randomness and sensitivity.     

江都第三抽水站油压装置油泵运行方式分析

以南水北调东线一期江都第三抽水站改造工程为例,针对其油压装置油泵运行方式如何选择的问题,基于绝热过程方程式,采用对比的方法,分析了断续运行方式和连续运行方式的年用电费用、设备投资、设备寿命、技术经济性。结果表明:断续运行是油泵运行方式的最佳选择。     

常熟水利枢纽泵站水泵典型故障分析与改造

对常熟水利枢纽泵站主水泵近年来运行中发生的典型故障进行分析,找到发生故障的原因,通过水力计算和模型试验研究,制定泵装置优化设计方案,指导常熟水利枢纽泵站加固改造。采用理论分析与试验相结合的方法,对原水泵、流道结构以及运行工况等进行分析。通过原型泵的装置数模计算和性能试验,选择合适新的水力模型,并对原泵装置结构进行优化,改善了水流特性。对水泵结构和材料进行了优化和加强,提高水泵的运行可靠性。改造后泵站机组,运行稳定性大大提高,为"引江济太"调水引流的效益发挥提供了的保障。常熟水利枢纽泵站机组加固改造的成功为江苏沿江泵站运行管理和今后的改造,提供了借鉴。     

江汉油区出砂油井治理技术研究

经过40年的开发,江汉油区地层出砂越来越严重,致使作业维护井次逐年上升,严重影响了油井的正常生产。根据江汉油区出砂储层地质特征和出砂井生产现状,有针对性地开展出砂井井筒清砂和携砂举升采油技术研究或矿场试验,使出砂井治理收到了一定效果,缓解了地层出砂对油井生产的影响,为进一步开展出砂油井治理指明了主攻技术方向。     

强制循环泵运行电流高的原因及对策

通过对FIX-450型强制循环泵操作环境、工作状况和结构参数的分析，找出其运行电流高的原因，并采取改进措施，使其运行电流恢复至正常水平。     

水泥预分解窑用碱性耐火材料的技术进展

介绍了水泥预分解窑的工作条件及其对窑衬耐火材料的影响 ,论述了目前世界水泥预分解窑的技术进展及其对窑用碱性耐火材料的要求 ,以及窑用碱性耐火材料的技术进展 ,分析了我国预分解窑生产技术的发展及预分解窑用耐火材料的发展 ,指出了中国预分解窑用耐火材料近期的发展趋势