This dissertation put forward a new control scheme to improve the control performance of load simulator . this control scheme which can bring the merit of the two kinds of servo valves into full play , use a pressure servo valve and a flow servo valve to control loading system 本文提出了压力伺服阀和流量伺服阀双阀控制方案,通过与压力伺服阀单阀控制方案的对比,指出其特点,为减摇鳍加载台的设计提供了新方法。
This paper also analyzes the load control of generating electricity unit in detail . gas turbine plays a role of responding quickly and load control , but the respondence speed of steam circulation system is slower relatively . if traditional pid controller is adopted to control load , the output of gas turbine is easy to vibrate so as to make system unstable 燃气轮机发挥着快速响应速度负荷控制指令的功能,而蒸汽循环系统的响应相对慢的多,如果利用传统的pid控制器进行了负荷控制,燃气轮机的出力易出现震荡,给系统带来不西安理工大学硕士学位论文稳定的同索,对燃”三轮机及其辅助设苏个利。
For long - span bridges , long - space spatial structure , high - rise buildings , high - rise tower , wind load is one of control loads for structure design , beside for the many use of kinds of the light weight and high strength material and many use of glass cladding , the problem of wind load on the building structure become more serious 对于大跨度桥梁、大跨度空间结构、高层建筑、高耸塔桅结构来说,风荷载是其结构设计中主要的控制荷载之一,同时由于各种轻质高强度材料及玻璃幕墙的大量运用,使得建筑结构受风影响的问题更加突出。
The factors which affect load frequency characteristics are dissected in this thesis . frequency characteristics of constant revolution controlled load 、 synchronous motor dragged load 、 asynchronous motor dragged load and their effect to dynamic frequency characteristics are analysed . conclusion is reached as : increasing the efficiency of asynchronous motor can recede its slip and improve dynamic frequency characteristics 论文深入分析了影响负荷频率特性的因素,分析了恒转速控制工具机、同步机拖动工具机以及异步机拖动工具机的频率特性和它们分别对系统动态频率过程的影响,得出了恒转速控制工具机对系统动态频率不利;提高异步机的效率可降低其转差率,从而改善系统动态频率特性的结论。