發(fā)布時間：2018-07-03 21:53

  本文選題：電阻膜片 + 氣泡霧化　； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：精密碳膜電位計作為一種位移傳感器,由于其高穩(wěn)定性和高精度的特點,被廣泛應(yīng)用于航空航天領(lǐng)域的位置反饋系統(tǒng)中。電阻膜片作為精密碳膜電位計中關(guān)鍵組成部分,其加工質(zhì)量體現(xiàn)在電阻值、線性度和耐磨性上,會直接影響位置反饋系統(tǒng)的控制精度和使用壽命。制造精密碳膜電位計的過程中,采用霧化射流噴涂工藝加工電阻膜片,電阻液噴涂的霧化質(zhì)量會對電阻膜片的加工質(zhì)量有至關(guān)重要的影響。本課題首先在精密碳膜電位計噴涂裝置的基礎(chǔ)上,分析了電阻膜片霧化射流噴涂加工的原理,對氣泡霧化噴嘴的霧化特性進(jìn)行了系統(tǒng)的研究。氣泡霧化噴嘴是一種新型霧化噴嘴,具有一些其他傳統(tǒng)類型霧化噴嘴不具有的優(yōu)點,如霧化質(zhì)量受噴嘴口內(nèi)徑影響小、霧化質(zhì)量高、耗氣量小。為將氣泡霧化噴嘴的優(yōu)點更好地應(yīng)用于電阻液霧化,進(jìn)行了電阻液氣泡霧化射流的數(shù)值模擬,通過仿真結(jié)果得到霧化氣壓條件對液滴速度等霧化質(zhì)量的影響。然后設(shè)計搭建了電阻液氣泡霧化射流PIV(Particle Image Velocimetry)速度測量實驗臺,利用條件參數(shù)可調(diào)的霧化設(shè)備,采用先進(jìn)的PIV儀器,配合開發(fā)的PIV圖像處理軟件,搭建了不受外界干擾的實驗環(huán)境,實現(xiàn)了對電阻液氣泡霧化射流場的測量。采用多重網(wǎng)格迭代互相關(guān)算法,通過Matlab軟件編寫了PIV圖像處理程序,完成了對電阻液氣泡霧化射流場圖像的分析處理,得到了流場的瞬態(tài)速度分布,實驗結(jié)果令人滿意。最后基于精密碳膜電位計噴涂裝置進(jìn)行了某型號電阻膜片的噴涂工藝試驗,在不同電阻液氣泡霧化射流場中進(jìn)行加工,得到不同霧化特性對電阻膜片的電阻值以及線性度的影響,尋求較優(yōu)的工藝參數(shù)組合滿足目標(biāo)型號的電阻值和線性度的要求。
[Abstract]:As a displacement sensor, precision carbon film potentiometer is widely used in position feedback system in aerospace field because of its high stability and high accuracy. As a key component of the precision carbon film potentiometer, the resistance film is characterized by its resistance, linearity and wear resistance, which will directly affect the control accuracy and service life of the position feedback system. In the process of making the precision carbon film potentiometer, the atomization quality of the resistive liquid spray will have an important effect on the processing quality of the resistance film. Firstly, based on the precision carbon film potentiometer spraying device, the principle of resistance film spray jet spraying is analyzed, and the atomization characteristics of bubble atomizing nozzle are studied systematically. Bubble atomizing nozzle is a new type of atomizing nozzle, which has some advantages that other traditional atomization nozzles do not have. For example, the atomization quality is little affected by the nozzle inner diameter, the atomization quality is high, and the gas consumption is small. In order to apply the advantages of bubble atomizing nozzle to the atomization of resistive liquid, the numerical simulation of the atomizing jet with resistive liquid was carried out. The influence of atomization pressure on the droplet velocity and other atomization quality was obtained by the simulation results. Then, a PIV (Particle Image velocimetry) velocity measuring system is designed and built. The PIV image processing software is developed with advanced PIV instrument and the atomizing equipment with adjustable conditional parameters. An experimental environment without external interference was set up to measure the atomized jet field of resistance liquid bubble. A PIV image processing program is developed by using the iterative cross-correlation algorithm of multi-grid and Matlab software. The image analysis of resistive liquid bubble atomization jet field is completed, and the transient velocity distribution of the flow field is obtained. The experimental results are satisfactory. Finally, based on the precision carbon film potentiometer spraying device, the spraying process of a certain type of resistive film was tested and processed in different resistance liquid bubble atomization jet field. The influence of different atomization characteristics on resistance value and linearity of resistance film is obtained, and the optimum combination of process parameters is found to meet the requirements of resistance value and linearity of the target model.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212

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本文編號：2095130