發(fā)布時(shí)間：2018-02-12 05:03

  本文關(guān)鍵詞： 臨界轉(zhuǎn)速 ANSYS 傳遞矩陣法 模態(tài)分析 EMD 實(shí)驗(yàn)法　出處：《上海應(yīng)用技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本論文是基于市財(cái)政資助的《能源動(dòng)力機(jī)械轉(zhuǎn)子振動(dòng)故障實(shí)驗(yàn)平臺(tái)》完成的。在組裝調(diào)試高速柔性轉(zhuǎn)子實(shí)驗(yàn)臺(tái)時(shí),發(fā)現(xiàn)在逐漸增大轉(zhuǎn)子主軸轉(zhuǎn)速到達(dá)一定轉(zhuǎn)速時(shí)因?yàn)檎駝?dòng)過(guò)大然后導(dǎo)致轉(zhuǎn)速不能繼續(xù)增大、在過(guò)完臨界轉(zhuǎn)速后振幅依然處在振幅最高值以及轉(zhuǎn)子降速過(guò)程中它的臨界轉(zhuǎn)速的值有偏移等問(wèn)題。經(jīng)過(guò)查閱國(guó)內(nèi)外各種相關(guān)文獻(xiàn)后,決定先通過(guò)傳遞矩陣法對(duì)轉(zhuǎn)子實(shí)驗(yàn)臺(tái)進(jìn)行臨界轉(zhuǎn)速的計(jì)算和有限元軟件ANSYS對(duì)振動(dòng)實(shí)驗(yàn)臺(tái)的轉(zhuǎn)子進(jìn)行臨界轉(zhuǎn)速的計(jì)算以及模態(tài)分析,然后通過(guò)轉(zhuǎn)子實(shí)驗(yàn)臺(tái)進(jìn)行實(shí)驗(yàn),實(shí)驗(yàn)時(shí)還著重分析了垂直安裝兩個(gè)電渦流位移傳感器在主軸的同一平面上會(huì)產(chǎn)生一定的誤差,更改了安裝方式后,獲取轉(zhuǎn)子的頻譜圖、波形圖、軸心軌跡圖和幅值圖因?yàn)榕_(tái)體和桌子不平衡、油膜渦動(dòng)、外界的噪音以及實(shí)驗(yàn)室的溫度和濕度的影響,使實(shí)驗(yàn)數(shù)據(jù)圖結(jié)果不夠準(zhǔn)確。把得到的圖形數(shù)據(jù)采用EMD方法進(jìn)行去噪音處理。再把處理過(guò)的數(shù)據(jù)結(jié)果對(duì)比傳遞矩陣法和有限元法的結(jié)果,最后分析出各種方法出現(xiàn)誤差的原因。本論文基于實(shí)驗(yàn)平臺(tái)的使用,發(fā)現(xiàn)問(wèn)題、提出問(wèn)題、解決問(wèn)題,得出了一些有意義的結(jié)論。通過(guò)對(duì)《高速轉(zhuǎn)子系統(tǒng)臨界轉(zhuǎn)速及其模態(tài)分析》得出:在分析真實(shí)的旋轉(zhuǎn)機(jī)械時(shí),要特別注意這些產(chǎn)生誤差的原因,使結(jié)果更加準(zhǔn)確,使旋轉(zhuǎn)機(jī)械盡量偏離臨界轉(zhuǎn)速,保證良好的運(yùn)行轉(zhuǎn)態(tài),延長(zhǎng)使用壽命,預(yù)防旋轉(zhuǎn)機(jī)械突然損壞而造成重大事故。
[Abstract]:This paper is based on the "Energy Power Machinery rotor Vibration Test platform", which is funded by the city. When the high-speed flexible rotor test bench is assembled and debugged, It is found that when the rotor spindle speed is gradually increased to a certain speed, because the vibration is too large, the rotational speed can not continue to increase. After completing the critical speed, the amplitude is still at the highest value of the amplitude and the critical speed of the rotor is offset in the process of deceleration. After consulting all kinds of relevant literature at home and abroad, It is decided that the critical speed of the rotor is calculated by the transfer matrix method, the critical speed of the rotor is calculated by the finite element software ANSYS, and the modal analysis of the rotor is carried out, and then the experiment is carried out through the rotor test table. In the experiment, the error of two eddy current displacement sensors installed vertically on the same plane of the spindle is analyzed. After changing the installation mode, the spectrum and waveform of the rotor are obtained. Because of the imbalance between the table and the table, the oil film whirling, the noise from the outside, and the temperature and humidity of the laboratory, The result of the experiment data graph is not accurate enough. The EMD method is used to deal with the noise. Then, the results of the processed data are compared with the results of the transfer matrix method and the finite element method. Finally, the causes of errors in various methods are analyzed. Based on the use of experimental platform, this paper finds problems, puts forward problems, and solves problems. Some meaningful conclusions are drawn. By analyzing the critical speed and its mode of high speed rotor system, it is concluded that in analyzing real rotating machinery, special attention should be paid to the causes of these errors so as to make the results more accurate. The rotating machinery deviates from the critical speed as far as possible to ensure a good running state, prolong the service life, and prevent the sudden damage of the rotating machinery from causing serious accidents.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH133

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