本文選題：非接觸式測(cè)量 + 失諧葉片輪盤��； 參考：《遼寧工業(yè)大學(xué)》2017年碩士論文

【摘要】：葉片輪盤系統(tǒng)廣泛應(yīng)用于燃汽輪機(jī)、航空發(fā)動(dòng)機(jī)、大型壓縮機(jī)等旋轉(zhuǎn)機(jī)械中,作為大型旋轉(zhuǎn)機(jī)械的主要工作部件,承擔(dān)著將熱能等其他能量轉(zhuǎn)化為機(jī)械能的重要任務(wù)。在長(zhǎng)期承受復(fù)雜的應(yīng)力應(yīng)變和惡劣工況影響的情況下,通常會(huì)導(dǎo)致葉片產(chǎn)生失諧。使葉片失諧使葉盤系統(tǒng)產(chǎn)生振動(dòng)局部化,長(zhǎng)此以往大型旋轉(zhuǎn)機(jī)械的葉盤系統(tǒng)將出現(xiàn)某一個(gè)或幾個(gè)葉片的高循環(huán)疲勞失效現(xiàn)象。為了避免葉片輪盤系統(tǒng)疲勞失效造成的重大財(cái)產(chǎn)損失,對(duì)葉片的振動(dòng)監(jiān)測(cè)和參數(shù)辨識(shí)方面的研究便顯得尤為重要。本課題結(jié)合失諧葉片輪盤系統(tǒng)振動(dòng)的非接觸測(cè)量問(wèn)題,著重研究以下幾個(gè)問(wèn)題:(1)首先,在葉片振動(dòng)理論的指導(dǎo)下,借助有限元軟件對(duì)葉片的應(yīng)力應(yīng)變和模態(tài)特征進(jìn)行了分析。通過(guò)分析得到的數(shù)據(jù)繪制出不同厚度葉片的應(yīng)力、位移形變?cè)茍D和葉片坎貝爾圖,完成了葉片的選型工作。并通過(guò)仿真分析獲得了葉片和葉片輪盤系統(tǒng)的振動(dòng)特征。(2)采用MATLAB軟件建立葉片振動(dòng)響應(yīng)模型,對(duì)葉片進(jìn)行振動(dòng)特征的虛擬仿真分析;基于非線性最小二乘法對(duì)葉片恒轉(zhuǎn)速同步振動(dòng)參數(shù)進(jìn)行辨識(shí),并結(jié)合仿真數(shù)據(jù)對(duì)非線性最小二乘法的辨識(shí)精度進(jìn)行驗(yàn)證。研究最小二乘法對(duì)葉片振動(dòng)參數(shù)辨識(shí)的可靠性。(3)對(duì)微小失諧旋轉(zhuǎn)葉片輪盤系統(tǒng)的葉片振動(dòng)進(jìn)行非接觸測(cè)量。將測(cè)得葉片振動(dòng)的振幅特征與MATLAB軟件在同等參數(shù)條件下模擬仿真的葉片振幅進(jìn)行對(duì)比分析,驗(yàn)證MATLAB軟件對(duì)葉片輪盤系統(tǒng)振動(dòng)虛擬仿真分析結(jié)果的可靠性。
[Abstract]:Blade disk system is widely used in rotating machinery such as steam turbine, aeroengine, large compressor and so on. As the main working part of large rotating machinery, it undertakes the important task of converting heat energy and other energy into mechanical energy.Under the influence of complex stress and strain and bad working conditions for a long time, it usually leads to the detuning of the blade.The vibration localization of the disk system is caused by the detuning of the blade, and the high cyclic fatigue failure of one or more blades will occur in the disk system of the large rotating machinery in the long run.In order to avoid the great property loss caused by the fatigue failure of the blade wheel system, it is very important to study the vibration monitoring and parameter identification of the blade.Based on the non-contact measurement of the vibration of detuned vane disk system, the following problems: 1: 1 are studied. Firstly, under the guidance of blade vibration theory, the stress strain and modal characteristics of the blade are analyzed with the help of finite element software.Based on the data obtained, the stress, displacement deformation cloud diagram and Campbell diagram of blades with different thickness were drawn, and the blade selection was completed.The vibration characteristics of blade and blade disk system are obtained by simulation analysis. (2) the blade vibration response model is established by MATLAB software, and the virtual simulation analysis of blade vibration characteristics is carried out.The reliability of the least square method for the identification of blade vibration parameters is studied. (3) Non-contact measurement of blade vibration of micro detuned rotating vane disk system is carried out.The amplitude characteristics of the measured blade vibration are compared with the blade amplitude simulated by MATLAB software under the same parameters. The reliability of the MATLAB software for the virtual simulation analysis of the blade wheel system vibration is verified.
【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH17

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