本文關(guān)鍵詞：漁船用海水流化冰制冰機(jī)控制系統(tǒng)研發(fā)　出處：《浙江海洋大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 流化冰 制冰機(jī) 控制系統(tǒng) 模糊PID PLC

【摘要】：流化冰技術(shù)是一種高科技保鮮技術(shù),在食品速凍、冷鏈物流和低溫貯藏等方面具有廣泛的應(yīng)用前景。因其換熱效果好、對水產(chǎn)品表皮無損傷和可節(jié)約淡水等優(yōu)點(diǎn),流化冰制冰機(jī)是當(dāng)前國內(nèi)外研究熱點(diǎn),尤其是在漁船上的應(yīng)用研究。目前漁船用流化冰制冰機(jī)的自動化程度較低,導(dǎo)致穩(wěn)定性和效率較差,因此研發(fā)漁船用海水流化冰制冰機(jī)的控制系統(tǒng)有著重要現(xiàn)實(shí)意義。本文首先分析了漁船用海水流化冰制冰機(jī)控制系統(tǒng)的研發(fā)現(xiàn)狀,指出了目前控制系統(tǒng)控制策略不完善的問題,提出了一種基于變頻壓縮機(jī)和電子膨脹閥雙控制的控制系統(tǒng)方案。其次,以流化冰含冰率和制冰速率為控制目標(biāo),研究了模糊PID控制在電子膨脹閥開度自動調(diào)節(jié)上的應(yīng)用,并完成了基于西門子S7-300PLC的軟件平臺STEP7的模糊控制算法程序設(shè)計(jì)及基于MCGS的人機(jī)交互界面設(shè)計(jì)。最后,進(jìn)行了MATLAB仿真和實(shí)驗(yàn)驗(yàn)證,對比結(jié)果表明:與常規(guī)PID控制相比,采用模糊PID控制的控制系統(tǒng),具有較好響應(yīng)性和抗干擾性;含冰率進(jìn)入平穩(wěn)區(qū)所需時間縮短36%,控制精度是其2-3倍;進(jìn)入平穩(wěn)區(qū)后受到干擾,重新進(jìn)入穩(wěn)態(tài)區(qū)所需時間縮短42%,并且含冰率變化峰值僅為其50%。本研究提高了制冰效率,降低了冰堵幾率,提升漁船用海水流化冰制冰機(jī)的自動化水平,對流化冰在漁業(yè)領(lǐng)域的應(yīng)用起到了一定推動作用。
[Abstract]:Fluidized ice technology is a kind of high-tech preservation technology, which has a wide application prospect in food quick freezing, cold chain logistics and low temperature storage, because of its good heat transfer effect. For the advantages of no damage to the skin of aquatic products and the saving of fresh water, fluidized ice making machine is a research hotspot at home and abroad, especially in the application of fishing boats. At present, the degree of automation of fluidized ice making machines used in fishing vessels is low. As a result of poor stability and efficiency, it is of great practical significance to develop the control system of marine fluidized ice making machine for fishing boats. Firstly, this paper analyzes the research and development status of the control system of sea water fluidized ice making machine for fishing boats. This paper points out that the control strategy of the control system is not perfect at present, and puts forward a control system scheme based on the dual control of the frequency conversion compressor and the electronic expansion valve. Secondly, the control targets are the ice content of fluidized ice and the ice making rate. The application of fuzzy PID control to the automatic adjustment of the opening of electronic expansion valve is studied. And completed the software platform based on Siemens S7-300 PLC STEP7 fuzzy control algorithm program design and human-computer interface design based on MCGS. Finally. The MATLAB simulation and experimental results show that the fuzzy PID control system has better response and anti-interference than the conventional PID control system. The time required for the ice content to enter the stationary region is shortened by 36 times, and the control accuracy is 2-3 times. After entering the stationary region, the time required to re-enter the steady region is reduced by 42%, and the peak value of the change of ice content is only 50%. This study improves the efficiency of ice making and reduces the probability of ice blocking. Raising the automation level of sea water fluidized ice making machine for fishing boats has played a certain role in promoting the application of fluidized ice in fishery field.
【學(xué)位授予單位】：浙江海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TS254.4

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本文編號：1398803