外文翻譯---三坐標測量機測頭的誤差校準-其他專業(yè)-文庫吧資料
2025-01-27 09:17本頁面
【正文】 anjing University of Aeronautics and Astronautics ,Nanjing 210016 China) （ 2. Taiyuan University of Technology ,Taiyuan 030024 China) Abstract: From the system point of view, the feature of the thermal power unit and the demand on its control system are analyzed and research in details in this paper. The character that the boils and the steam turbine are a whole of relative independence is fully considered. By coordinate control, the purpose of the optimal whole operating effect of the system is realize adopting the key techniques of munication, puter and intelligent information process etc.... The adaptation and whole property of the system is emerged by interaction and coordination between subsystems. 1Introduction The system is an anic whole certain structure and function ,which consists of several element with interrelation , interdependence and interplay .The thermal power unit is a typical system ,posed of generator ,steam turbine ,boiler and many anxiliary equipment .Its main function is to produce the power load according to power work requirement .System engineering is the science used to study and design the plex system .In the meantime, It is also the theory and method used to deal with systems in term of definite aim in order to achieve the optimal whole of the system .From the system point of view, the coordinate control system of the thermal power unit has been studied and designed in this paper . 2 Study and Design on Automation Control System of the Thermal Power unit from the System Point of View Function of Automation Control System of the Power unit At first the thermal power unit as the controlled object is deeply studied before its automation control system is studied and designed .The thermal power unit is a huge group of equipments ,which is posed of generator, ,steam turbine ,boiler and many auxiliary equipments. Its process flow is plex and pipelines intervenient .Especially the largescale power unit is a typical coupling ,nonlinear ,varying plex controlled object with multiinput and multioutput .Thousands of parameters are measured ,operated and controlled .The character of object is changeful because of many different operating modes and switch relation .With enlarging of industry production scale and the raising of people’s living standard ,the required quantity of power energy is increasing and the difference of apex and vale of power load is increasing .So the new and higher require is put forward for automation control system of the power unit . （ 1.） Load control :Along with the increase of the unit capacity ,early load control mode of “boiler follows steam turbine ”or “steam turbine follows boiler ” has not already satisfied the requirements so we must adopt more suitable load control scheme ,which is the unit coordinate control . （ 2.） Reliability: The design of system must be reliable, ensuring safe and economic operation of the unit .In addition, The tolerance fault, redundant technology ,selfdiagnosis of software and hardware must be adopted to improve the reliability of system . （ 3.） Communication and manmachine interface: Because there are many parameters need to be measured and controlled and its varying speed is quick when the large scale unit is running , munication system must
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