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1、此文档是毕业设计外文翻译成品（ 含英文原文+中文翻译），无需调整复杂的格式！下载之后直接可用，方便快捷！本文价格不贵,也就几十块钱！一辈子也就一次的事！外文标题：The Variable Frequency and Speed Regulation Constant Pressure Water Supply System Based on PLC and Fuzzy Control外文作者：Peng Xiaohong, Xiao Laisheng ，Mo Zhi，Liu Guodong 文献出处: 2018 International Conference on Measuring Tech
2、nology and Mechatronics Automation (如觉得年份太老，可改为近2年，毕竟很多毕业生都这样做)英文2684单词，16878字符(字符就是印刷符)，中文4000汉字。（如果字数多了，可自行删减，大多数学校都是要求选取外文的一部分内容进行翻译的。）The Variable Frequency and Speed Regulation Constant Pressure Water Supply System Based on PLC and Fuzzy ControlAbstractFor solving the problem of poor quality an
3、d waste of electric energy coursed by water supply mode of a high water tower and a direct water pump, introduce a constant pressure supply water system, which adopts embedded fuzzy control technology, using PLC and frequency convener as its core. When the system runs, water pressure of the pipe is
4、inputted into the PLC from terminal X0 through pressure transmitter. Comparing the value of measured pressure with its set value, PLC controls the work frequency of the frequency converter by the output signal on fuzzy calculation in order to control rotation speed of water pump and adjust water pre
5、ssure of the pipe. The real time control performance to the water Pressure of water supply system designed in this paper was proved to be all-right according to the experimentation validated. The hard ware module is steady-going and reliable, and the fuzzy controller is proper and valid and can guar
6、antee the better stability of water pressure.Keywords-fuzzy control; PLC; variable frequency and speed regulationI.INTRODUCTIONWith the high-speed development of economy and society, energy shortage is becoming more and more obvious and the peoples requirements on both quality and reliability of wat
7、er supply is also increasing. Therefore it has become an inevitable trend to use advanced automation technology to design the constant pressure water supply system with high energy conservation and high reliability. Because the users requirement of water supply is often unsteady, a closed-loop regul
8、ation is needed to use outside a frequency converter in order to keep a constant water pressure and it is generally realized by PID in the past. However, the water supply system is a lag one with great inertia and the users requirement for water supply has large randomness and it may lead to water p
9、ressure on the pipeline without changing law, so it is a hard job to describe it with precise mathematical model. Therefore, it is difficult to achieve satisfactory control effect by using the traditional PID control. The fuzzy control technology is a good way to use fuzzy inference to realize syste
10、m control and it does not need to build mathematical models 1.In recent years, many researchers added fuzzy control strategy to a variety of control schemes and achieved satisfactory results. Li Zhong and others designed a kind of fuzzy water supply control system controlled by PLC that can overcome
11、 the issues to adjust the parameters difficultly in the traditional PID control 2. Zhao Bao-yong has designed a fuzzy-PID controller with self-adjusting factor based on a single chip, which has played an important role to control the water supply system with non-linear, lag characteristics and also
12、solved the problem to adjust parameters difficultly in the traditional PID control 3. LI Xin-chun designed a constant pressure water supply controller based on AT89C51 and applied fuzzy self-tuning PID algorithm to it 4. Qiao Weide puts forward a design with adaptive closed-loop control functions on
13、 pipeline pressure through the combination of neural networks and fuzzy logic and it has been robust and reliability 5. Wang Cai-xia has designed a fuzzy water supply system for one frequency converter to control three pumps, which greatly reduces the cost of both design and operation 6Among the sch
14、emes mentioned above, most of them are based on the PID control, which have greater frequency fluctuations and easily lead to water pressure in the pipeline unsteady. To solve those problems, after having systemically analyzed the work characteristic and the technical requirement for a water supply
15、control system, we have taken fuzzy control method to build a constant pressure water supply system based on PLC and frequency converter. We make use of fuzzy logic control theory to make pressure sensor signal to input and control variable from output fuzzy and achieve fuzzy logic control table by
16、fuzzy reasoning according to the rule table made by operating experience. In the course of real-time control, the system transforms input signal of pressure detected in real-time into output by seeking fuzzy logic control table, and then we obtain a precise output by fuzzy decision-making. At last, the system completes the whole process of fuzzy logic control for constant water pressure by controlling the frequency of motor according to the precise o
