本文選題：全矢譜 + 轉(zhuǎn)子動力學　； 參考：《鄭州大學》2012年碩士論文

【摘要】：轉(zhuǎn)子系統(tǒng)結構參數(shù)(如剛度、阻尼等)、偏心質(zhì)量(外激勵)等對系統(tǒng)的動力學特性有很大的影響,而基于振動檢測的故障診斷過程實質(zhì)上是根據(jù)轉(zhuǎn)子系統(tǒng)動力學響應的特征來分析其剛度,阻尼以及激勵可能產(chǎn)生的變化。全矢譜技術是一項采用信息融合的思想來客觀描述轉(zhuǎn)子-軸承系統(tǒng)動力學響應中一些關鍵特征量的實用技術,全矢譜中的各特征參數(shù)可作為轉(zhuǎn)子系統(tǒng)故障診斷的依據(jù)。因此,根據(jù)轉(zhuǎn)子動力學和全矢譜理論來分析并建立轉(zhuǎn)子系統(tǒng)動力學參數(shù)(如支承剛度等)與全矢譜參數(shù)(如主振矢、振矢角等)的關系有十分重要的意義。 大部分旋轉(zhuǎn)機械的支撐具有各向異性,即支撐的各方向具有不同的剛度或阻尼。為了分析水平/豎直方向上的剛度、阻尼以及偏心質(zhì)量的分布與全矢譜各參數(shù)的之間的關系,本文建立了相應的轉(zhuǎn)子-軸承系統(tǒng)的有限元模型,利用有限元分析方法進行數(shù)值模擬,然后通過轉(zhuǎn)子試驗臺進行實驗驗證。 通過水平和豎直方向上的剛度變化與全矢譜參數(shù)的關系的研究結果表明：在恒定轉(zhuǎn)速下,改變兩相互垂直方向上的剛度,則主振矢、副振矢和方位角均隨剛度的變化而變化,通過實驗對這一結論進行了驗證。根據(jù)上述結論,提出依據(jù)偏心率進行故障判別的方法,根據(jù)軸承剛度對振矢和方位角的影響給出傳感器的安裝原則,從而提高對轉(zhuǎn)子系統(tǒng)故障監(jiān)測的準確性。 通過有限元分析方法對軸承阻尼與全矢譜參數(shù)之間的關系進行分析,數(shù)值模擬結果表明：阻尼對主振矢、副振矢以及振矢角均有影響。阻尼可以降低轉(zhuǎn)子系統(tǒng)的振動量,使振矢值減小,軸心軌跡的偏心率也有一定程度上的降低,故軸承阻尼對振動有一定的抑制作用。 就轉(zhuǎn)子-軸承系統(tǒng)的偏心質(zhì)量對全矢譜參數(shù)影響的分析結果表明：在忽略交叉剛度和阻尼的情況下,圓盤的偏心質(zhì)量只對主振矢和副振矢有影響,而對運動軌跡的偏心率和振矢角沒有影響,即偏心質(zhì)量只對軸心運動軌跡的大小有影響,對軸心軌跡的形狀和位置沒有影響。 本文所確立的轉(zhuǎn)子系統(tǒng)參數(shù)和全矢譜參數(shù)之間關系的結論,可以較好地應用于旋轉(zhuǎn)機械的故障機理研究中,從而提高故障診斷的準確率
[Abstract]:The structural parameters of rotor system (such as stiffness, damping, etc.) and eccentric mass (external excitation) have great influence on the dynamic characteristics of the system. The process of fault diagnosis based on vibration detection is based on the characteristics of dynamic response of rotor system to analyze the possible changes of stiffness, damping and excitation. The whole vector spectrum technique is a practical technique to objectively describe some key characteristic variables in the dynamic response of rotor-bearing system using the idea of information fusion. The characteristic parameters in the full vector spectrum can be used as the basis for fault diagnosis of the rotor system. Therefore, it is of great significance to analyze and establish the relationship between the dynamic parameters of rotor system (such as support stiffness) and the full vector spectrum parameters (such as main vibration vector, vibration vector angle, etc.) according to rotor dynamics and total vector spectrum theory. The support of most rotating machinery is anisotropic, that is, the stiffness or damping of the bracing is different in each direction. In order to analyze the relationship between stiffness, damping and eccentric mass distribution in horizontal / vertical direction and the parameters of full vector spectrum, a finite element model of rotor-bearing system is established in this paper. The finite element analysis method is used to simulate the rotor test rig. The relationship between the stiffness variation in horizontal and vertical directions and the total vector spectral parameters is studied. The results show that the main vibration vector, the secondary vibration vector and the azimuth change with the change of stiffness when the stiffness of the two vertical directions is changed at constant rotational speed. This conclusion is verified by experiments. According to the above conclusions, the method of fault diagnosis based on eccentricity is put forward, and the installation principle of sensor is given according to the influence of bearing stiffness on vibration vector and azimuth angle, so as to improve the accuracy of fault monitoring of rotor system. The relationship between the damping of bearing and the parameters of full vector spectrum is analyzed by finite element method. The numerical simulation results show that the damping has an effect on the main vibration vector, the secondary vibration vector and the angle of the vibration vector. Damping can reduce the vibration of the rotor system, reduce the vibration vector, and reduce the eccentricity of the axis trajectory to a certain extent, so the bearing damping has a certain inhibitory effect on the vibration. The results of the analysis of the effect of the eccentric mass of the rotor bearing system on the parameters of the full vector spectrum show that the eccentric mass of the disk only affects the main vibration vector and the secondary vibration vector when the cross stiffness and damping are ignored. But it has no effect on the eccentricity and the angle of vibration vector, that is, the eccentric mass has no effect on the shape and position of the axis track, but only on the size of the axis track. The conclusion of the relationship between the rotor system parameters and the total vector spectrum parameters established in this paper can be well applied to the study of the fault mechanism of rotating machinery, thus improving the accuracy of fault diagnosis.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH165.3

【引證文獻】

相關碩士學位論文 前1條

1 王紹;全矢高階譜分析關鍵技術研究[D];鄭州大學;2013年

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本文編號：1921336