A method of fuzzy optimization design based on genetic algorithm is presented as a new method of parameter optimization design for dc double closed loop speed adjusting system . the method covers three steps . firstly , speed overshoot rate and settling time are chosen as performance indice according to the demand of engineering . these indice are normalized by using fuzzy membership function and then weighted to form objective function of optimization model of the system . secondly , the dynamic response curve of the system with corresponding parameters and peoformance indice are obtained by computerized numerical calculation and simulation . finally , parameters of engineering design are expanded as searching space ; and parameters of speed regulator and current regulator are taken as genes in chromosome . these genes in searching space are optimized to get best solution by way of genetic algorithm . as shown by experimental results , the parameters designed by this method are capable of significantly improving performance indice of the system , which proves that it is a practical and effective method 提出一种基于遗传算法的直流双闭环调速系统参数优化设计方法.根据工程技术的要求，选用速度超调量和过渡时间作为参数优化性能指标.将该指标用模糊隶属度函数归一化，再加权平均形成系统优化模型的目标函数.采用计算机数值计算方法，通过仿真获得系统对应参数的动态响应曲线及其性能指标.最后以工程设计的参数为搜索范围，以速度调节器和电流调节器的参数为染色体中的基因，通过遗传算法在搜索范围中优化这些基因，获得优化解.实验结果表明，所设计的参数能使系统性能指标有显著提高
From impulse - response curves that were derived from vec models based on cointegration vectors finally , we can conclude as follows : all monetary policy tool variables have rather small impulse to macro - economy variables in the short run , and their impulse would boost up at different degree in the long run 从最终作出的基于协整向量的误差修正模型的冲击响应曲线，可看到：所有货币政策工具变量对宏观经济变量的冲击在短期内均较微弱，从长期来看，冲击均有不同程度的增强。
At first , the dynamic mathematic model is created in the light of the known dimensions and structure . then base on the mathematic model , dynamic analysis of the system is studied by drawing the open - loop bode diagram closed - loop bode diagram and step response curve using the analysis and calculating function of matlab . the influence factor on frequency character steady and performance of the system is also analyzed 首先，根据已确定的尺寸参数和结构需要，计算并建立起系统的动态数学模型，然后在已知系统数学模型的基础上，利用matlab语言强大的分析计算功能，对系统进行动态分析，通过画出系统的开环bode图、闭环bode图及系统的阶跃响应曲线，分析了系统的频率特性、稳定性及系统性能的影响因素。
As follows are the main contents of this paper : firstly , a matlab program has been worked out according to the response model of integrate and defective pile in time zone ; secondly , the most important factor that affects the curve of velocity is obtained through analyzing the curve of velocity response 主要研究内容如下：首先，针对成层土中完整桩和缺陷桩的时域响应模型编制了matlab程序；其次，通过对成层土中桩的时域速度响应曲线的分析，得到了影响速度响应曲线的主要因素。
