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1、基于VB的先进控制程序的研究与开发中文摘要本文介绍了遗传算法在PID控制中的应用。文章主要包括两个方面:遗传算法的基本原理和它的应用,还介绍了如何用VB为一个PID控制系统编制程序。理论方面讨论了遗传算法的基本技术原理,遗传算法的操作过程,遗传算法适合应用的环境,遗传算法的改进,基本的遗传算法的实现方法,遗传算法的种群代数和遗传算法的发展。遗传算法在过去三十年得到了迅猛的发展,并且遗传算法已经应用于大量的应用领域中。在很多应用方面都得到了很大的成功。遗传算法理论吸引了更多了研究者来研究它,发展它。遗传算法主要包含了复制,交叉,变异三个算子。PID控制器参数的优化设计是一个组合优化问题,因此采用
2、遗传算法智能整定技术。遗传算法求解组合优化问题所涉及的主要问题有参数编码方案、适应度函数设计、遗传算法参数选择等。在优化问题的实际应用中,合理处理以上问题,构造合适的遗传算法框架,是遗传算法的关键所在。遗传算法是对参数的编码进行操作,而非参数本身;而且是从多点开始并行操作,并不仅仅是局限于一点的。通过目标函数来计算适配值,而不需要其他的推导,从而对问题的依赖型较小,寻优规则由概率决定的。遗传算法可对解空间进行高效的启发式搜索,并且对于待寻优的函数基本无限制,既可以是数学解析式所表示的显函数,也可以式映射矩阵甚至神经网络的隐函数,因而应用范围较广。【关键词】PID控制,遗传算法,复制,交叉,变异
3、Study Of Advance Control Program Based on Visual Basic AbstractThis paper provides a review in genetic algorithms. The discussion includes theoretical aspects of genetic algorithms and genetic algorithm applications. Theoretical topics under review include genetic algorithm techniques, genetic opera
4、tor technique, niching techniques, genetic drift, method of benchmarking genetic algorithm performances, measurement of difficulty level of a test-bed function,population genetics and developmental mechanism in genetic algorithms. Examples of genetic algorithm application in this review are pattern
5、recognition, robotics, artificial life, expert system, electronic circuit design, cellular automata, and biological applications. Genetic Algorithms have been intensively studied during the past three decades. Amounts of applications have benefited from the utilisation of genetic algorithms. Theoret
6、ical approaches on genetic algorithms have also helped researchers to understand the mechanisms of genetic algorithms. This paper is produced in an attempt to provide a brief description of current developments in genetic algorithms. The discussion can be divided roughly into two main parts: theoretical aspects of genetic algorithms and genetic algorithm applications. genetic algorithm contains reproduction operator、crossover operator、mutation operator.【Key words】PID control ,Genetic algorithm, Reproduction,Crossover , Mutation2