本文關(guān)鍵詞： 熱力膨脹閥 開度測試 流量測試 容量測試 模糊自適應(yīng)　出處：《中國計(jì)量學(xué)院》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：熱力膨脹閥作為制冷系統(tǒng)的重要組成部分，根據(jù)過熱度變化自動(dòng)調(diào)節(jié)進(jìn)入蒸發(fā)器的制冷劑流量。容量是熱力膨脹閥的重要性能指標(biāo)，表征了熱力膨脹閥的制冷能力。容量測試必須在特定的工況下進(jìn)行，國家標(biāo)準(zhǔn)對其作了嚴(yán)格的規(guī)定。然而，目前熱力膨脹閥容量測試系統(tǒng)在工況控制上普遍采用傳統(tǒng)的單輸入單輸出控制算法，這往往忽略了工況參數(shù)之間的耦合性。因此，無法使測試工況達(dá)到理想的控制品質(zhì)，從而導(dǎo)致容量測試精度低下�；谏鲜銮闆r，本文開發(fā)了一種基于多變量模糊自適應(yīng)算法的熱力膨脹閥容量測試系統(tǒng)，實(shí)現(xiàn)了測試工況的優(yōu)化控制和容量的準(zhǔn)確測試。主要研究內(nèi)容如下： （1）熱力膨脹閥容量測試系統(tǒng)整機(jī)方案設(shè)計(jì)。包括開度測試裝置的設(shè)計(jì)、制冷劑流量測試裝置的設(shè)計(jì)和控制模塊的設(shè)計(jì)。開度測試裝置由傳感器、電磁閥、電控比例閥、恒溫槽等部件組成，實(shí)現(xiàn)開度-感溫包溫度特性曲線的測定。制冷劑流量測試裝置由制冷回路、冷卻水回路和冷凍水回路組成，實(shí)現(xiàn)制冷劑質(zhì)量流量-開度特性曲線的測定。控制模塊以工控機(jī)為核心，利用多功能數(shù)據(jù)采集卡實(shí)現(xiàn)信號采集與控制。在系統(tǒng)軟件設(shè)計(jì)上，，利用Visual Basic6.0開發(fā)了一套可視化的測試軟件，提供了友好的、易操作的用戶界面。 （2）制冷劑流量測試工況控制算法的研究。在分析工況參數(shù)的影響因素及參數(shù)間耦合關(guān)系的基礎(chǔ)上，將參數(shù)自調(diào)整的多變量模糊控制算法應(yīng)用于工況的控制，并對控制器的控制品質(zhì)進(jìn)行了分析�？刂平Y(jié)果表明，該算法具有良好的跟蹤性、較高的控制精度。 （3）實(shí)驗(yàn)研究。對熱力膨脹閥容量測試系統(tǒng)的實(shí)驗(yàn)數(shù)據(jù)進(jìn)行了分析，并根據(jù)實(shí)驗(yàn)數(shù)據(jù)對該系統(tǒng)進(jìn)行了性能評定。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)的容量測試相對誤差在1.5%以內(nèi)，容量測量合成標(biāo)準(zhǔn)不確定度為0.059kW，擴(kuò)展不確定度為0.118kW，滿足了課題的設(shè)計(jì)要求。
[Abstract]:Thermal expansion valve, as an important part of refrigeration system, automatically adjusts the refrigerant flow into evaporator according to the change of superheat. Capacity is an important performance index of thermal expansion valve. The refrigeration capacity of thermal expansion valve is characterized. The capacity test must be carried out under specific working conditions, which is strictly regulated by the national standard. At present, the traditional single input and single output control algorithm is widely used in the capacity measurement system of thermal expansion valve, which often ignores the coupling between the operating parameters. It can not make the test condition achieve the ideal control quality, which leads to the low accuracy of capacity testing. Based on the above situation, this paper develops a thermal expansion valve capacity test system based on multivariable fuzzy adaptive algorithm. The optimal control of the test condition and the accurate measurement of the capacity are realized. The main research contents are as follows: 1) the design of the whole system for measuring the capacity of the thermal expansion valve, including the design of the opening test device, the design of the refrigerant flow test device and the design of the control module. The opening test device is composed of sensors and solenoid valves. Electronic control proportional valve, constant temperature tank and other components to achieve the open-temperature package temperature characteristic curve measurement. Refrigerant flow test device consists of refrigeration circuit, cooling water loop and chilled water loop. The measurement of refrigerant mass flow-opening characteristic curve is realized. The control module takes industrial control computer as the core and uses multi-function data acquisition card to realize signal acquisition and control. In the system software design. A set of visual testing software is developed by using Visual Basic6.0, which provides a friendly and easy user interface. 2) study on the control algorithm of refrigerant flow test condition. Based on the analysis of the influence factors of the operating conditions parameters and the coupling relationship between the parameters. The multivariable fuzzy control algorithm with self-adjusting parameters is applied to the control of working conditions and the control quality of the controller is analyzed. The control results show that the algorithm has good tracking performance and high control accuracy. The experimental data of the thermal expansion valve capacity test system are analyzed, and the performance of the system is evaluated according to the experimental data. The experimental results show that. The relative error of capacity measurement is less than 1.5%, the uncertainty of capacity measurement synthesis standard is 0.059kW, and the extended uncertainty is 0.118kW, which meets the design requirements of the project.
【學(xué)位授予單位】：中國計(jì)量學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP274;TB657

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王川川;趙錦成;齊曉慧;;模糊控制器設(shè)計(jì)中量化因子、比例因子的選擇[J];四川兵工學(xué)報(bào);2009年01期

2 由玉文;吳愛國;張志剛;翟文鵬;;變負(fù)荷工況下制冷系統(tǒng)多變量模糊控制方法研究[J];低溫與超導(dǎo);2011年12期

3 江沿源;鐘桂龍;;風(fēng)冷、水冷和蒸發(fā)式冷凝器制冷系統(tǒng)經(jīng)濟(jì)性研究[J];廣東化工;2008年10期

4 李慎安;測量不確定度表述講座 第六講 標(biāo)準(zhǔn)測量不確定度的B類評定[J];中國計(jì)量;2000年06期

5 郭學(xué)森;韓旭;周森林;劉永華;李永;;直接蒸發(fā)冷卻系統(tǒng)現(xiàn)狀與展望[J];建筑熱能通風(fēng)空調(diào);2009年03期

6 朱瑞琪,陳文勇,吳業(yè)正;電子膨脹閥的控制[J];流體機(jī)械;1998年05期

7 周永明,陳芝久,孫文哲,于兵;面向多變量控制的制冷系統(tǒng)性能分析[J];流體機(jī)械;1999年04期

8 李兆博;吳愛國;何熠;翟文鵬;;制冷系統(tǒng)的改進(jìn)Smith預(yù)估補(bǔ)償和解耦控制[J];控制理論與應(yīng)用;2013年01期

9 張淑芹;;測量不確定度的評定方法[J];品牌與標(biāo)準(zhǔn)化;2010年04期

10 田健;朱瑞琪;馮全科;;風(fēng)冷制冷機(jī)組的多變量模糊控制研究[J];西安交通大學(xué)學(xué)報(bào);2006年05期

本文編號：1483398