The nucleus is the software in the design and realization of virtual instruments . we use the design method of module and use many papers to describe the whole building process of the typical signal generation module , date handling module , date reading and writing module , resultdemonstrate module . as the conclusions , we also offer the panels and the diagrams of virtual signal frequency spectrum analytical instrument , virtual butterworth filter , virtual signal generation instrument , virtual integrator and differentiator regulator and amplitude modulation wave counter modulation instrument 本文采用模块化设计方法，详细描述了典型信号生成模块、数据处理模块、数据读取和存储模块、显示模块等软件开发的全过程，分析、解决了设计及实现过程中出现的问题，并给出了已实现的虚拟信号频谱分析仪、虚拟巴特沃斯滤波器、调幅波解调器、虚拟信号发生器、虚拟积分器和微分器等实验教学用虚拟仪器的前面板图和程序流程图。
Some methods , such as adding integrator ; making use of neural network to remember fuzzy rule ; utilizing bang - bang controller and adjusting scale and proportion factors online , are researched to modify normal fuzzy controller for optimizing srd ' s dynamic and static performance . the simulation results given in this paper show the srd with modified fuzzy controller has excellent performance 本文以提高srd动、静态性能为指标，研究了如下几种改进模糊控制的方法： ( 1 )串联或并联积分器以提高静态精度； ( 2 )利用神经网络记忆模糊控制规则； ( 3 ) bang - bang控制与模糊控制结合； ( 4 )在线调整量化因子与比例因子。
