数控专业毕业设计外文翻译--wincc在供热站恒压供水监控系统中的应用-数控设计(编辑修改稿)

数控专业毕业设计外文翻译--wincc在供热站恒压供水监控系统中的应用-数控设计(编辑修改稿)内容摘要：

or, this design of a dualmode Fuzzy2PI control, As shown in figure 2, and its design thinking is。 when the pressure is greater error when using fuzzy control, to obtain good transient。 When the pressure on the steadstate error into smaller, switched to process from PI control, to obtain good steady precision. PI control algorithms and fuzzy control algorithms are PLC, switching time by a puter program based on prior to the error autormatically. The system uses twoinput singleoutput fuzzy controller. to pressure the desired value and the measurement of e error and the error as a fuzzy controller input linguistic variables, transducer frequency variation u language as output variables. To e error, the error rate ec and control volume u fuzzy subset of ( NB,NS,ZE,PS,PB) and they quantified the domain of seven grades, (3,2,1,0,1,2,3). Fuzzy subset of the membership function used triangle. Initial experience of fuzzy control rules, as shown in table 1. Under these rules calculation of the total fuzzy relation R: 毕业设计（论文）外文翻译 Where x, U fuzzy relationship matrix on behalf of the “Cartesian” and the “and” operator. According minimax inference rules synthesis of output variables language domain of fuzzy sets U: U Finally, the weighted average method used for solutions vague and fuzzy volume U converted into precise amount u. The process is carried out offline, eventually Fuzzy Control Table, as shown in table 2. This form of the PLC memory storage, realtime control, fuzzy control would streamline the process for finding inquiries on the questionnaire process. Parametric Selection of Frequencywater system a reasonable selection pressure control parameters constant pressure to achieve energysupply system. The realization of is this objective the key is pressure control parameter selection, usually pipe work pressure control point two choice: a pipe work is the most negative pressure on constant pressure control and the other is the constant pressure pump outlet. pressure control. How will the two choices, we have to analyze simple Network pressure on the most disadvantaged constant, the water pipe work by QMAX reduced to Q1, pumps reduce speed, and water characteristic curve of A (unchanged) at the intersection point C, pump characteristic curve downward, work pressure on the most disadvantaged H0. And the pump outlet pressure constant pressure control, Ha unchanged, reduce water consumption by QMAX QI and Ha to pay to。