本文選題：拉桿轉(zhuǎn)子 + 分形接觸理論　； 參考：《陜西科技大學(xué)》2017年碩士論文

【摘要】：以材料表面的微觀特性分析為起點(diǎn),運(yùn)用粗糙表面的分形接觸理論,建立了輪盤面接觸模型,從理論上對(duì)拉桿轉(zhuǎn)子的接觸剛度問題作了進(jìn)一步深入研究。通過MATLAB軟件編程計(jì)算了拉桿轉(zhuǎn)子的法向和切向接觸剛度,得到不同預(yù)緊力和粗糙度下的剛度變化曲線。將一系列剛度值添加到輪盤的接觸模型中,并對(duì)拉桿轉(zhuǎn)子進(jìn)行了有限元模態(tài)分析;計(jì)算了滑動(dòng)軸承的動(dòng)力特性系數(shù),對(duì)拉桿轉(zhuǎn)子-軸承系統(tǒng)做了有限元模態(tài)分析,研究了剛性支撐和滑動(dòng)軸承支撐下拉桿轉(zhuǎn)子固有特性受預(yù)緊力的影響,以及改變轉(zhuǎn)子轉(zhuǎn)速影響滑動(dòng)軸承動(dòng)力特性系數(shù)的變化規(guī)律并分析滑動(dòng)軸承性能改變對(duì)拉桿轉(zhuǎn)子固有特性的影響;最后分析了溫度對(duì)法向和切向接觸剛度以及溫度對(duì)拉桿轉(zhuǎn)子-軸承系統(tǒng)固有頻率的改變。分析發(fā)現(xiàn)接觸剛度主要與預(yù)緊力和表面粗糙度有關(guān),且隨著預(yù)緊力增大,接觸剛度值開始時(shí)增長(zhǎng)較快,之后會(huì)逐漸變緩,并趨于一個(gè)定值,輪盤接觸表面越光滑的接觸剛度值越大,固有頻率的變化規(guī)律也是如此;隨著拉桿轉(zhuǎn)子轉(zhuǎn)速的升高,滑動(dòng)軸承的剛度系數(shù)和阻尼系數(shù)均呈下降趨勢(shì),拉桿轉(zhuǎn)子的固有頻率在剛性支撐下要大于滑動(dòng)軸承支撐的情況;滑動(dòng)軸承支撐下拉桿轉(zhuǎn)子固有頻率的變化是按照正向渦動(dòng)頻率隨轉(zhuǎn)速的提高而增大,反向渦動(dòng)頻率隨著轉(zhuǎn)速的提高而減小;隨著溫度的升高,轉(zhuǎn)子的材料性能會(huì)發(fā)生變化,使得拉桿轉(zhuǎn)子的接觸剛度下降,其固有頻率也隨之變小。為了驗(yàn)證所建模型的正確有效性,通過錘擊實(shí)驗(yàn)測(cè)試了拉桿轉(zhuǎn)子的固有特性,得到了模型轉(zhuǎn)子的幅頻特性曲線。具體內(nèi)容是對(duì)模型拉桿轉(zhuǎn)子的每根拉桿單獨(dú)進(jìn)行了預(yù)緊力標(biāo)定,擬合出拉桿預(yù)緊力隨擰緊力矩變化的曲線,組裝并調(diào)試了拉桿轉(zhuǎn)子實(shí)驗(yàn)臺(tái),完成了不同轉(zhuǎn)速和預(yù)緊力下拉桿轉(zhuǎn)子的錘擊響應(yīng)實(shí)驗(yàn)。分析結(jié)果與實(shí)驗(yàn)測(cè)試得到數(shù)據(jù)的一致性可以說明本文構(gòu)建的模型和使用的方法能夠準(zhǔn)確體現(xiàn)拉桿轉(zhuǎn)子的力學(xué)特性并正確分析其動(dòng)力學(xué)問題。
[Abstract]:Based on the analysis of the microcosmic characteristics of the material surface and the fractal contact theory of rough surface, the contact model of wheel and disk surface is established. The contact stiffness of the rod rotor is further studied theoretically. The normal and tangential contact stiffness of the rod rotor is calculated by MATLAB software, and the stiffness variation curves under different pretightening forces and roughness are obtained. A series of stiffness values are added to the contact model of the wheel plate, and the finite element modal analysis of the pull rod rotor is carried out, the dynamic characteristic coefficient of the sliding bearing is calculated, and the finite element modal analysis of the pull rod rotor-bearing system is done. In this paper, the influence of pretension force on the inherent characteristics of the pull rod rotor supported by rigid support and sliding bearing is studied. The influence of rotor speed on the dynamic characteristic coefficient of sliding bearing is analyzed, and the influence of the change of bearing performance on the natural characteristic of pull rod rotor is analyzed. Finally, the change of normal and tangential contact stiffness of temperature and the natural frequency of pull rod rotor bearing system are analyzed. It is found that the contact stiffness is mainly related to the pretension force and the surface roughness, and with the increase of the pretension force, the contact stiffness value increases rapidly at the beginning, then becomes slower and tends to a fixed value. With the increase of rotor speed, the stiffness coefficient and damping coefficient of sliding bearing decrease with the increase of rotor speed. The natural frequency of the rod rotor under rigid support is larger than that of the sliding bearing support, and the natural frequency of the pull rod rotor under the sliding bearing support increases with the increase of the rotational speed. The reverse vortex frequency decreases with the increase of rotational speed, and with the increase of temperature, the material performance of the rotor changes, which makes the contact stiffness of the rod rotor decrease and its natural frequency become smaller. In order to verify the validity of the model, the inherent characteristics of the pull rod rotor are tested by hammering experiments, and the amplitude-frequency characteristic curves of the model rotor are obtained. The specific content is that the pretension force of each rod of the model rod rotor is calibrated separately, the curve of the tension force changing with the tightening moment is fitted, and the test bench of the pull rod rotor is assembled and debugged. The hammering response of the rod rotor under different rotational speeds and pre-tightening forces has been completed. The consistency between the analysis results and the experimental data shows that the model and the methods used in this paper can accurately reflect the mechanical characteristics of the rod rotor and correctly analyze its dynamic problems.
【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH113

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉昕;袁奇;歐文豪;;燃?xì)廨啓C(jī)周向拉桿轉(zhuǎn)子拉桿應(yīng)力分析和改進(jìn)設(shè)計(jì)[J];西安交通大學(xué)學(xué)報(bào);2016年10期

2 賈延旭;張鎖懷;蔣賢龍;;基于ANSYS帶預(yù)緊力拉桿轉(zhuǎn)子模態(tài)分析[J];陜西科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年05期

3 李強(qiáng);許偉偉;王振波;金有海;鄭水英;;滑動(dòng)軸承動(dòng)力特性的數(shù)值計(jì)算方法[J];中國(guó)石油大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年05期

4 溫淑花;張宗陽;張學(xué)良;蘭國(guó)生;丁紅欽;王南山;;固定結(jié)合面剛度分形模型[J];農(nóng)業(yè)機(jī)械學(xué)報(bào);2013年02期

5 蔣洪德;;重型燃?xì)廨啓C(jī)的現(xiàn)狀和發(fā)展趨勢(shì)[J];熱力透平;2012年02期

6 蔣洪德;;加速推進(jìn)重型燃?xì)廨啓C(jī)核心技術(shù)研究開發(fā)和國(guó)產(chǎn)化[J];動(dòng)力工程學(xué)報(bào);2011年08期

7 劉少權(quán);張艷春;杜兆剛;王正;;溫度場(chǎng)對(duì)燃?xì)廨啓C(jī)拉桿轉(zhuǎn)子臨界轉(zhuǎn)速的影響[J];燃?xì)廨啓C(jī)技術(shù);2011年02期

8 張學(xué)良;賈庭芳;文曉光;溫淑花;武美先;;懸臂梁結(jié)合面建模與接觸剛度參數(shù)識(shí)別[J];太原科技大學(xué)學(xué)報(bào);2010年06期

9 何鵬;劉占生;張廣輝;馮永志;;分布拉桿轉(zhuǎn)子動(dòng)力學(xué)建模與分析[J];汽輪機(jī)技術(shù);2010年01期

10 溫淑花;張學(xué)良;文曉光;王鵬云;武美先;;結(jié)合面切向接觸剛度分形模型建立與仿真[J];農(nóng)業(yè)機(jī)械學(xué)報(bào);2009年12期

相關(guān)會(huì)議論文 前1條

1 王永亮;劉占生;孫立權(quán);;滑動(dòng)軸承-轉(zhuǎn)子系統(tǒng)動(dòng)力穩(wěn)定性的理論及實(shí)驗(yàn)研究[A];第9屆全國(guó)轉(zhuǎn)子動(dòng)力學(xué)學(xué)術(shù)討論會(huì)ROTDYN'2010論文集[C];2010年

相關(guān)博士學(xué)位論文 前2條

1 何鵬;彈塑性接觸和溫度分布對(duì)拉桿轉(zhuǎn)子動(dòng)力學(xué)特性的影響研究[D];哈爾濱工業(yè)大學(xué);2013年

2 方兵;精密數(shù)控機(jī)床及其典型結(jié)合面理論建模與實(shí)驗(yàn)研究[D];吉林大學(xué);2012年

相關(guān)碩士學(xué)位論文 前6條

1 艾書民;溫度場(chǎng)對(duì)航空發(fā)動(dòng)機(jī)轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)特性影響的研究[D];沈陽航空航天大學(xué);2012年

2 占敏劍;航空發(fā)動(dòng)機(jī)轉(zhuǎn)子熱力耦合分析[D];東北大學(xué);2010年

3 劉宇斌;大型通用機(jī)械轉(zhuǎn)子—軸承系統(tǒng)的動(dòng)力學(xué)分析[D];大連理工大學(xué);2009年

4 何鵬;分布式拉桿轉(zhuǎn)子動(dòng)力學(xué)特性分析[D];哈爾濱工業(yè)大學(xué);2009年

5 章圣聰;基于非連續(xù)性特點(diǎn)的盤式拉桿轉(zhuǎn)子軸承系統(tǒng)彎振動(dòng)力學(xué)研究[D];中南大學(xué);2008年

6 黃銳;9FA燃?xì)庹羝?lián)合循環(huán)機(jī)組軸系動(dòng)態(tài)特性分析[D];華北電力大學(xué)（北京）;2007年

，

本文編號(hào)：2045381