本文關(guān)鍵詞：燃?xì)獍l(fā)電機(jī)組周向拉桿轉(zhuǎn)子非線性動(dòng)力學(xué)特性研究　出處：《華北電力大學(xué)(北京)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 燃?xì)獍l(fā)電機(jī)組 多盤拉桿式轉(zhuǎn)子 非線性動(dòng)力學(xué)分析 碰摩故障 初始彎曲故障 故障診斷

【摘要】：近年來,重型發(fā)電燃?xì)廨啓C(jī)在整體煤氣化聯(lián)合循環(huán)發(fā)電系統(tǒng)(IGCC系統(tǒng))、燃?xì)庹羝?lián)合循環(huán)發(fā)電系統(tǒng)等領(lǐng)域中得到了廣泛的應(yīng)用。與傳統(tǒng)的蒸汽發(fā)電機(jī)組相比,燃?xì)獍l(fā)電機(jī)組技術(shù)集成度更高、結(jié)構(gòu)更加復(fù)雜,較高的工作溫度和壓力對(duì)燃?xì)廨啓C(jī)的結(jié)構(gòu)和材料提出了較大的挑戰(zhàn)。轉(zhuǎn)子系統(tǒng)是燃?xì)廨啓C(jī)的核心部件,主要由壓氣機(jī)、透平以及相應(yīng)的支承系統(tǒng)構(gòu)成,開展燃?xì)廨啓C(jī)轉(zhuǎn)子動(dòng)力學(xué)特性研究,對(duì)于保障燃?xì)廨啓C(jī)安全穩(wěn)定運(yùn)行具有重要意義。本文依托于中央在京高校重大成果轉(zhuǎn)化項(xiàng)目“大型燃?xì)獍l(fā)電機(jī)組監(jiān)測(cè)保護(hù)系統(tǒng)及應(yīng)用”(ZDZH20141005401),以燃?xì)廨啓C(jī)多盤拉桿式轉(zhuǎn)子為對(duì)象,通過理論分析、數(shù)值模擬以及試驗(yàn)研究,對(duì)故障狀態(tài)下拉桿轉(zhuǎn)子系統(tǒng)的非線性動(dòng)力學(xué)響應(yīng)特性進(jìn)行研究,所得結(jié)果對(duì)深入掌握拉桿轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)特性,提高燃?xì)廨啓C(jī)轉(zhuǎn)子設(shè)計(jì)制造水平和運(yùn)行安全可靠性提供技術(shù)支持。論文的主要研究?jī)?nèi)容如下:(1)研究了拉桿轉(zhuǎn)子在碰摩故障條件下的非線性動(dòng)力學(xué)特性。建立了考慮輪盤之間接觸特性的拉桿轉(zhuǎn)子軸承系統(tǒng)非線性動(dòng)力學(xué)模型,對(duì)輪盤發(fā)生碰摩條件下的轉(zhuǎn)子響應(yīng)進(jìn)行求解,探討了系統(tǒng)轉(zhuǎn)速、靜子徑向剛度、不平衡質(zhì)量偏心距等參數(shù)對(duì)轉(zhuǎn)子動(dòng)力學(xué)特性的影響。通過與整體轉(zhuǎn)子系統(tǒng)的碰摩響應(yīng)特性對(duì)比分析表明:考慮輪盤之間的接觸特性與不考慮輪盤之間接觸特性的碰摩轉(zhuǎn)子系統(tǒng)響應(yīng)特性存在較大差異;靜子徑向剛度、偏心量、轉(zhuǎn)速對(duì)系統(tǒng)響應(yīng)特性影響較大,碰摩力主要影響系統(tǒng)高轉(zhuǎn)速區(qū)域的響應(yīng)特性。(2)研究了具有初始彎曲的拉桿轉(zhuǎn)子軸承系統(tǒng)的非線性動(dòng)力學(xué)特性。在拉桿轉(zhuǎn)子軸承系統(tǒng)動(dòng)力學(xué)模型中考慮轉(zhuǎn)軸初始彎曲的影響,計(jì)算分析了轉(zhuǎn)子系統(tǒng)響應(yīng),討論了系統(tǒng)轉(zhuǎn)速、初始彎曲量等參數(shù)對(duì)系統(tǒng)響應(yīng)的影響。結(jié)果表明:在分析具有初始彎曲故障的拉桿轉(zhuǎn)子系統(tǒng)的動(dòng)力學(xué)響應(yīng)特性的時(shí)候,將拉桿轉(zhuǎn)子近似的作為整體轉(zhuǎn)子處理是不合適的,建模時(shí)應(yīng)考慮輪盤之間接觸特性的影響;初始彎曲故障主要影響系統(tǒng)低轉(zhuǎn)速區(qū)域的響應(yīng)特性,隨著初始彎曲量的增加,系統(tǒng)的失穩(wěn)轉(zhuǎn)速逐漸增加,同時(shí)系統(tǒng)的混沌運(yùn)動(dòng)區(qū)域逐漸減小。(3)研究了初始彎曲與碰摩耦合條件下的拉桿轉(zhuǎn)子非線性動(dòng)力學(xué)特性�；谶_(dá)朗貝爾原理建立了考慮初始彎曲、輪盤接觸特性、非線性油膜力、碰摩力的拉桿轉(zhuǎn)子軸承系統(tǒng)動(dòng)力學(xué)模型,求解響應(yīng),討論了系統(tǒng)轉(zhuǎn)速、靜子徑向剛度、初始彎曲量等參數(shù)對(duì)系統(tǒng)耦合非線性動(dòng)力學(xué)響應(yīng)特性的影響。結(jié)果表明:不同故障模式下,拉桿轉(zhuǎn)子軸承系統(tǒng)的非線性動(dòng)力學(xué)響應(yīng)表現(xiàn)不同;與單一故障相比,耦合故障對(duì)拉桿轉(zhuǎn)子軸承系統(tǒng)動(dòng)力學(xué)特性的影響更為顯著,在低轉(zhuǎn)速區(qū)域,初始彎曲故障對(duì)系統(tǒng)的響應(yīng)特性影響較大,隨著轉(zhuǎn)速的升高碰摩故障逐漸成為影響系統(tǒng)運(yùn)動(dòng)特性的主導(dǎo)因素。(4)多盤拉桿轉(zhuǎn)子振動(dòng)特性的試驗(yàn)研究。設(shè)計(jì)搭建了多盤拉桿轉(zhuǎn)子實(shí)驗(yàn)臺(tái)及振動(dòng)測(cè)試系統(tǒng),采用模態(tài)參數(shù)辨識(shí)的方法識(shí)別多盤拉桿轉(zhuǎn)子系統(tǒng)在不同預(yù)緊力情況下的結(jié)構(gòu)特性。通過研究發(fā)現(xiàn)多盤拉桿轉(zhuǎn)子結(jié)構(gòu)一階彎振固有頻率以及二階彎振固有頻率隨拉桿螺栓擰緊力的升高呈現(xiàn)逐漸增大的趨勢(shì);輪盤之間接觸面的應(yīng)力分布對(duì)結(jié)構(gòu)的固有特性產(chǎn)生影響。
[Abstract]:In recent years, the heavy gas turbine for electricity generation in integrated gasification combined cycle power generation system (IGCC system), the field of gas steam combined cycle power generation system has been widely used. Compared with the traditional steam turbine, gas turbine technology to a higher degree of integration, the structure is more complex, presented a larger challenge higher temperature and pressure of the structure and material of the gas turbine. The rotor system is the core components of gas turbine, mainly by the compressor, turbine and a corresponding supporting system, to carry out research on the dynamic characteristics of gas turbine rotor, has important significance for guaranteeing the safe and stable operation of the gas turbine. This paper is based on the monitoring and protection system of large gas turbines in central Beijing University major achievement transformation project "and application" (ZDZH20141005401), the gas turbine disc rod type rotor as the research object, through theoretical analysis Analysis, numerical simulation and experimental study on the nonlinear dynamic response characteristics, the rotor system under fault condition is studied, the result of the master rod rotor system dynamics, improve the gas turbine rotor design and manufacture level and operation safety and reliability to provide technical support. The main research contents of this paper are as follows: (1) study on nonlinear dynamic characteristics the rotor of the rubbing fault conditions. The nonlinear dynamic characteristics of rod rotor bearing system model considering the contact between the wheel of the wheel, occurrence of rotor rub impact response under conditions are solved, discusses the system speed, stator radial stiffness, unbalance mass eccentricity parameters of the rotor dynamic characteristics. With the whole rotor system with characteristics of comparative analysis shows that the response of friction: considering the contact characteristics between the wheel and not consider Roulette There is a big difference between the rotor system response characteristics between the contact characteristics; the stator radial stiffness, eccentricity, rotational speed of the system response characteristics influence response characteristics of main influencing system through touch the high speed region. (2) studied the nonlinear dynamics with initial bending of the rotor bearing system. Considering the influence of initial rotating shaft in the bending of the rod rotor bearing system dynamics model, analyzed the response of rotor system, discusses the system speed, influence of initial bending parameters on the response of the system. The results show that when the dynamics of rotor system with initial bending failure in the analysis of the response characteristics, the rotor as a whole rotor is approximate not appropriate, modeling should be considered characteristic of contact between the wheel; response characteristics mainly affect the initial bending faults of low speed region And with the increase of initial bending, the instability speed of the system increases gradually, the chaotic motion area while the system decreases gradually. (3) studied the nonlinear dynamics of the rotor with initial bending and rubbing coupling conditions. The Darren Bell principle is established considering initial bending based on wheel contact characteristics, nonlinear oil film force, response solving the dynamic rod rotor bearing system model, rub impact, discusses the system speed, stator radial stiffness, influence of initial bending and other parameters on the coupled nonlinear dynamic response characteristics. The results show that different kinds of failure modes, rod rotor bearing system with nonlinear dynamic response performance of different; compared with the single fault, the influence of coupling the fault dynamic characteristics of rod fastening rotor bearing system is more significant in the low speed region, the response characteristics of the initial bending on the rotor system with greater impact With the increase of speed of rubbing fault has become the dominant factors influencing the system motion characteristics. (4) experimental study on multi disc rotor vibration characteristics. The design of multi disc rotor experimental platform and vibration test system, the identification of modal parameter identification method of multi disc rotor rod system under different preload conditions the structure characteristics used. Through the study found that increased gradually increasing trend of multi disc rotor structure of bending vibration natural frequency and the two order bending vibration frequency with the bolt tightening force; stress distribution influence on the inherent characteristics of the structure of the contact surface between the wheel.

【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM314

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