本文選題：雙跨軸承轉(zhuǎn)子系統(tǒng) + 非線性動(dòng)力學(xué)　； 參考：《北京信息科技大學(xué)》2015年碩士論文

【摘要】：根據(jù)旋轉(zhuǎn)機(jī)械關(guān)鍵設(shè)備安全運(yùn)行的保障水平和預(yù)知維護(hù)的需求，以及現(xiàn)代測(cè)控技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室的主要研究領(lǐng)域，依托實(shí)驗(yàn)室北京市青年英才計(jì)劃項(xiàng)目（71A1411128），以典型雙跨軸承轉(zhuǎn)子系統(tǒng)為研究對(duì)象，開展其運(yùn)行狀態(tài)機(jī)理的理論研究進(jìn)而實(shí)現(xiàn)系統(tǒng)的穩(wěn)健性運(yùn)行評(píng)價(jià)。具體研究?jī)?nèi)容如下： （1）建立了雙跨軸承轉(zhuǎn)子系統(tǒng)非線性動(dòng)力學(xué)模型。分析旋轉(zhuǎn)機(jī)械的系統(tǒng)構(gòu)成、運(yùn)行特點(diǎn)及常見運(yùn)行狀態(tài)，以大型旋轉(zhuǎn)機(jī)械為原型，建立各運(yùn)行狀態(tài)下系統(tǒng)的動(dòng)力學(xué)模型，得到轉(zhuǎn)速和偏心量變化時(shí)系統(tǒng)的非線性動(dòng)力學(xué)響應(yīng)，并得到了系統(tǒng)響應(yīng)的振動(dòng)波形圖、平面相圖和Poincaré截面圖等。分析表明：建立的模型能夠反映出轉(zhuǎn)子系統(tǒng)參數(shù)變化過程中響應(yīng)的演化過程，計(jì)算結(jié)果有利于開展雙跨軸承轉(zhuǎn)子系統(tǒng)穩(wěn)健性運(yùn)行評(píng)價(jià)研究。 （2）開展了基于分形維數(shù)理論的雙跨軸承轉(zhuǎn)子系統(tǒng)運(yùn)行狀態(tài)評(píng)價(jià)理論與方法研究。考慮到系統(tǒng)響應(yīng)的不規(guī)則性和不穩(wěn)定性，以振動(dòng)數(shù)據(jù)為輸入，進(jìn)行系統(tǒng)的運(yùn)行穩(wěn)健性研究。應(yīng)用LabVIEW軟件實(shí)現(xiàn)了基于分形關(guān)聯(lián)維數(shù)與盒維數(shù)理論的雙跨軸承轉(zhuǎn)子系統(tǒng)穩(wěn)健性運(yùn)行評(píng)價(jià)方法。分析表明：建立的分形維數(shù)故障評(píng)價(jià)方法可以有效地對(duì)雙跨軸承轉(zhuǎn)子系統(tǒng)進(jìn)行運(yùn)行狀態(tài)評(píng)價(jià)。 （3）進(jìn)行了雙跨軸承轉(zhuǎn)子運(yùn)行測(cè)試與分析系統(tǒng)的開發(fā)研究。該系統(tǒng)可以進(jìn)行模擬與實(shí)驗(yàn)兩部分的狀態(tài)評(píng)價(jià)，在系統(tǒng)內(nèi)部以模塊化的形式存在，包括參數(shù)設(shè)置、數(shù)據(jù)分析、數(shù)據(jù)采集以及模型評(píng)價(jià)等。該系統(tǒng)對(duì)此類軸承轉(zhuǎn)子設(shè)備評(píng)價(jià)提供了相應(yīng)診斷工具。 （4）開展了相關(guān)實(shí)驗(yàn)研究。針對(duì)雙跨軸承轉(zhuǎn)子實(shí)驗(yàn)臺(tái)特定運(yùn)行狀態(tài)，進(jìn)行了單一故障、耦合故障條件下的實(shí)驗(yàn)研究，并進(jìn)行系統(tǒng)理論模型和穩(wěn)健性運(yùn)行評(píng)價(jià)方法驗(yàn)證。分析表明：在測(cè)試情況相同的條件下正常運(yùn)轉(zhuǎn)時(shí)的關(guān)聯(lián)維數(shù)值最大，碰摩運(yùn)行時(shí)關(guān)聯(lián)維數(shù)明顯下降，不平衡與基礎(chǔ)松動(dòng)運(yùn)行時(shí)的關(guān)聯(lián)維數(shù)值略有下降；正常運(yùn)轉(zhuǎn)時(shí)的盒維數(shù)值最小，不平衡故障對(duì)系統(tǒng)的盒維數(shù)值影響不明顯，碰摩運(yùn)行時(shí)的盒維數(shù)明顯升高。通過建立基于分形關(guān)聯(lián)維數(shù)與盒維數(shù)理論的雙跨軸承轉(zhuǎn)子穩(wěn)健性運(yùn)行評(píng)價(jià)系統(tǒng)能準(zhǔn)確真實(shí)的反應(yīng)系統(tǒng)運(yùn)行狀態(tài)。 最后，雙跨軸承轉(zhuǎn)子測(cè)試系統(tǒng)的功能有待進(jìn)一步完善，需要大量的實(shí)驗(yàn)和數(shù)據(jù)的采集與分析，以便進(jìn)一步提高診斷模型的應(yīng)用價(jià)值。
[Abstract]:According to the guarantee level of the safe operation of the key equipment of rotating machinery and the requirement of predictive maintenance, as well as the main research fields of the key laboratory of the Ministry of Education of the Ministry of Modern Measurement and Control Technology, Based on the laboratory project 71A1411128, the typical double-span bearing rotor system is taken as the research object, and the theoretical research on the mechanism of its running state is carried out to realize the robust operation evaluation of the system. The main contents are as follows: 1) the nonlinear dynamic model of two-span bearing rotor system is established. This paper analyzes the system structure, running characteristics and common running state of rotating machinery. Taking large rotating machinery as prototype, the dynamic model of the system under each running state is established, and the nonlinear dynamic response of the system is obtained when the rotational speed and eccentricity change. The vibration waveform diagram, plane phase diagram and Poincar 茅 section diagram of the system response are obtained. The analysis shows that the model can reflect the evolution process of response in the process of parameter change of rotor system. The calculation results are beneficial to the research of robust operation evaluation of double-span bearing rotor system. (2) the theory and method of evaluation of the running state of double-span bearing rotor system based on fractal dimension theory are studied. Considering the irregularity and instability of the system response, the stability of the system is studied by taking the vibration data as input. Based on the theory of fractal correlation dimension and box dimension, LabVIEW software is used to evaluate the robustness of a two-span bearing rotor system. The analysis shows that the established fractal dimension fault evaluation method can effectively evaluate the running state of the two-span bearing rotor system. The system can be used to evaluate the state of simulation and experiment, and exists in the form of modularization, including parameter setting, data analysis, data acquisition and model evaluation. The system provides a diagnostic tool for the evaluation of this kind of bearing rotor equipment. According to the specific running state of the double-span bearing rotor test table, the experimental research is carried out under the condition of single fault and coupling fault, and the system theoretical model and robust operation evaluation method are verified. The analysis shows that under the same test conditions, the correlation dimension of normal operation is the largest, the correlation dimension of rub-impact operation decreases obviously, and the correlation dimension of unbalance and foundation loosening decreases slightly. The value of box dimension is the smallest in normal operation. The influence of unbalanced fault on the value of box dimension is not obvious, but the box dimension of rub-impact operation is obviously increased. Based on the theory of fractal correlation dimension and box dimension, the evaluation system of rotor robustness of double-span bearing can accurately and truly respond to the running state of the system. Finally, the function of the double span bearing rotor test system needs to be further improved, and a large number of experiments and data collection and analysis are needed in order to further improve the application value of the diagnostic model.
【學(xué)位授予單位】：北京信息科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH133.3

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相關(guān)期刊論文 前1條

1 孫政策,徐健學(xué);碰摩轉(zhuǎn)子的非線性動(dòng)力學(xué)特性研究[J];動(dòng)力工程;2003年01期

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本文編號(hào)：2045136