本文關(guān)鍵詞：轉(zhuǎn)軸—密封系統(tǒng)的動力特性研究　出處：《河南理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 轉(zhuǎn)軸系統(tǒng) 非線性 分岔 機械密封 動態(tài)特性

【摘要】：在旋轉(zhuǎn)機械（如透平機械、潛水電機、泵類和壓縮機等）中，由于轉(zhuǎn)軸上安裝有機械密封裝置，轉(zhuǎn)軸和機械密封就組成了一個新的系統(tǒng)，即轉(zhuǎn)軸—密封系統(tǒng)。隨旋轉(zhuǎn)機械向大功率、高速度、高效率、低能耗方向的不斷發(fā)展，就有必要研究分析影響此類機械轉(zhuǎn)軸系統(tǒng)振動特性的各種因素。隨著對該系統(tǒng)考查的深入，單從線性的角度或考慮單一因素研究轉(zhuǎn)軸系統(tǒng)的振動特性已遠(yuǎn)遠(yuǎn)不能滿足實際生產(chǎn)的需要。眾多學(xué)者已認(rèn)識到：滑動軸承支承力和機械密封作用對轉(zhuǎn)軸系統(tǒng)振動特性的影響較為顯著。 本文以旋轉(zhuǎn)機械轉(zhuǎn)軸系統(tǒng)為主要研究對象，高度提煉出具有典型結(jié)構(gòu)的轉(zhuǎn)軸—密封系統(tǒng)的物理模型，以此開展了如下研究：①通過建立轉(zhuǎn)軸—密封系統(tǒng)模型，采用Runge-Kutta法，系統(tǒng)地研究分析了運行參數(shù)和密封參數(shù)等對機械轉(zhuǎn)軸系統(tǒng)和密封環(huán)振動特性的影響及其改變時所引發(fā)的分岔行為及混沌運動等現(xiàn)象。仿真結(jié)果表明：在一定條件下，當(dāng)考慮機械密封作用時，轉(zhuǎn)軸表現(xiàn)出疊加的復(fù)雜運動，，如隨著轉(zhuǎn)速的提高，轉(zhuǎn)軸系統(tǒng)會出現(xiàn)單周期運動、多倍周期運動、擬周期運動甚至混沌等。同時也發(fā)現(xiàn)當(dāng)考慮密封作用時，轉(zhuǎn)軸系統(tǒng)存在由倍周期運動—擬周期運動—混沌運動—倍周期的運動路徑。②研究了偏心距、密封壓差及密封間隙等對轉(zhuǎn)軸系統(tǒng)和密封環(huán)振動特性的影響規(guī)律和轉(zhuǎn)軸—密封系統(tǒng)的穩(wěn)定性。利用數(shù)值仿真結(jié)合Floquet理論對系統(tǒng)判穩(wěn)，結(jié)果表明：在低速時，轉(zhuǎn)軸系統(tǒng)將作穩(wěn)定的單周期運動，當(dāng)達(dá)到失穩(wěn)速度后，系統(tǒng)由于失穩(wěn)改作擬周期運動及更復(fù)雜的運動。研究發(fā)現(xiàn)不同的密封參數(shù)對系統(tǒng)穩(wěn)定性的影響不同。在相同的條件下，轉(zhuǎn)軸失穩(wěn)轉(zhuǎn)速隨機械密封間隙的增大而降低；隨壓差的增大而提高。這些結(jié)論也為機械密封設(shè)計和機械密封在整個系統(tǒng)中的安裝調(diào)試提供了一定的理論依據(jù)和指導(dǎo)。 本文利用模擬實驗平臺對上述理論進(jìn)行了實驗測試，通過對比實驗數(shù)據(jù)和仿真數(shù)據(jù)分析進(jìn)行了驗證。在結(jié)合理論分析和相關(guān)實驗的基礎(chǔ)上，研究分析了旋轉(zhuǎn)機械轉(zhuǎn)軸系統(tǒng)的振動特性及穩(wěn)定性問題等。所得的結(jié)論和結(jié)果將為發(fā)展對轉(zhuǎn)軸系統(tǒng)工程適用的振動抑制或控制技術(shù)，提高轉(zhuǎn)軸系統(tǒng)穩(wěn)定性分析、故障診斷、可控運行和優(yōu)化設(shè)計水平提供理論基礎(chǔ)。
[Abstract]:In the rotating machinery (such as turbine machine, submersible motor pumps and compressors, etc.), since the shaft is installed on the rotating shaft and the mechanical seal, mechanical seal on the formation of a new system, namely the shaft seal system. With the rotating machinery to high power, high speed, high efficiency, low energy consumption development direction and there are a variety of factors necessary to study the influence analysis of vibration characteristics of the mechanical shaft system. With the system studied deeply, or considering the vibration characteristics of the single factor study of shaft system can not meet the needs of the actual production from the linear perspective. Many scholars have realized: the influence of bearing force of sliding and mechanical seal effect on vibration characteristics of rotor system is more significant.
The rotating shaft system as the main research object, highly refined with physical model of shaft - typical structure of the sealing system, in order to carry out the research as follows: 1. Through the establishment of shaft seal system model, using Runge-Kutta method, systematic research and analysis of the operating parameters and the parameters of mechanical seal ring and shaft system vibration effect the sealing characteristics and the change of behavior caused by the bifurcation and chaotic motion. The simulation results show that under certain conditions, with mechanical seal, shaft exhibit complex motion superposition, such as with the increase of the rotation speed of shaft system will appear single periodic motion, multiple periodic motion, quasi periodic motion and chaos at the same time also found that when considering the sealing effect, existing shaft system by double period motion quasi periodic motion and chaotic motion motion path, cycle times Study on diameter. Eccentricity, sealing pressure and seal clearance on the stability of shaft system vibration characteristics and the influence of the sealing ring and the shaft seal system. By numerical simulation with Floquet theory on the system stability criterion, the results showed that: in the low speed, the shaft system will make single periodic motion stability, when to achieve speed instability, instability of the system for the quasi periodic motion and more complex. The study found that different sealing parameters influence on the stability of the system. In the same conditions, increasing the instability speed of shaft with mechanical seal gap decreases; with increasing pressure increasing. Provide some the theoretical basis and guidance for the installation and debugging of the conclusions of mechanical seal design and mechanical seal in the whole system.
Based on the above theoretical simulation platform was tested, through the comparative analysis of the experimental data and the simulation data were verified. On the basis of theoretical analysis and Experimental Research on the analysis of the shaft system vibration and stability problems. The conclusions and results will be used for the development of the vibration of shaft system engineering reduction and control, improve the stability of shaft system analysis, fault diagnosis, and provide a theoretical basis for controllable operation and optimize the design level.

【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH136

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