本文選題：過盈連接　切入點(diǎn)：微動滑移　出處：《大連理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：風(fēng)力發(fā)電的行星架與法蘭采用過盈連接,在風(fēng)力載荷作用下,過盈配合的接觸表面會產(chǎn)生小幅的相對滑動,該現(xiàn)象被稱之為微動滑移。微動滑移將導(dǎo)致表面磨損、萌生裂紋甚至可能產(chǎn)生微動疲勞失效。本文采用有限元軟件Workbench,建立該結(jié)構(gòu)的有限元模型,編寫后處理程序,考慮初始裝配和工作載荷下,計(jì)算前后過盈配合的微動滑移結(jié)果,并分析滑移原因、探討結(jié)構(gòu)形狀參數(shù)對微動滑移的影響,最后提出改進(jìn)方案。 首先,介紹有限元接觸分析基礎(chǔ)。在對接觸的定義、摩擦模型、接觸類型簡要說明后,本文從算法原理和典型算例出發(fā),比較各個(gè)接觸算法在計(jì)算滑移量方面的差異。 其次,建立準(zhǔn)確且經(jīng)濟(jì)的有限元模型。包括：模型簡化,忽略不必要的結(jié)構(gòu)特征；軸承等效,因?yàn)樵摻Y(jié)構(gòu)尺寸較大,其結(jié)構(gòu)剛度接近軸承剛度,所以前后軸承不再視為剛性約束,而是采用彈簧等效；網(wǎng)格劃分,選擇高階單元,且在過盈連接區(qū)域布置細(xì)密網(wǎng)格,達(dá)到兼顧精度和效率的目的；將整個(gè)分析過程分解為裝配、預(yù)緊和加載三個(gè)分析步,模擬原結(jié)構(gòu)的實(shí)際工況；網(wǎng)格劃分大小敏感度分析。 再次,考慮到Workbench只能輸出基于初始狀態(tài)的合成滑移量,所以需要自行編寫后處理程序計(jì)算滑移矢量,其主要流程：提取各個(gè)接觸單元在自然坐標(biāo)系下的微動滑移,經(jīng)過坐標(biāo)變換、節(jié)點(diǎn)結(jié)果平均,得到全局坐標(biāo)下的滑移結(jié)果,然后根據(jù)形函數(shù)插值獲得接觸區(qū)域的滑移場。采用該后處理程序,逐個(gè)分析研究三個(gè)分析步：裝配階段、預(yù)緊階段和加載階段,分別計(jì)算各個(gè)分析步的滑移結(jié)果,并分析不同網(wǎng)格單元大小對滑移幅值的影響。 最后,分析滑移原因和結(jié)構(gòu)影響因素,并據(jù)此提出改進(jìn)方案。從結(jié)構(gòu)形式、載荷形式和滑移結(jié)果等角度,分析引起后端滑移的原因,并據(jù)此提出對微動滑移有影響的若干結(jié)構(gòu)形狀參數(shù),采用上述算流程分析其影響大小。根據(jù)影響因素分析結(jié)果,提出結(jié)構(gòu)改進(jìn)方案。改進(jìn)后,后端過盈的最大滑移幅值從原來的40.0μm降低至8.8μm。
[Abstract]:When the planetary frame of wind power is connected with flange by interference, the contact surface of interference fit will produce small relative sliding under the action of wind load, which is called fretting slip. Fretting slippage will lead to surface wear. Crack initiation may even cause fretting fatigue failure. In this paper, the finite element model of the structure is established by using the finite element software Workbench, and the post-processing program is compiled to calculate the fretting slip results of the interference fit under the initial assembly and working load. The influence of structural shape parameters on fretting slip is analyzed and the improvement scheme is put forward. First of all, the basic of finite element contact analysis is introduced. After a brief description of the definition of contact, friction model and contact type, this paper compares the differences between the contact algorithms in calculating the slip amount from the principle of the algorithm and the typical examples. Secondly, an accurate and economical finite element model is established, which includes: simplification of the model and neglect of unnecessary structural characteristics; bearing equivalence, because the structure is larger in size and its structural stiffness is close to that of the bearing. Therefore, the front and rear bearings are no longer regarded as rigid constraints, but are equivalent to the spring; the mesh is divided, the high-order element is selected, and the fine mesh is arranged in the interference connection area to achieve the purpose of taking into account the accuracy and efficiency; the whole analysis process is decomposed into assembly. Preload and preload are three analytical steps to simulate the actual working conditions of the original structure and the sensitivity analysis of mesh size. Thirdly, considering that Workbench can only output the synthetic slippage based on the initial state, it is necessary to write a post-processing program to calculate the slip vector. The main process is to extract the fretting slippage of each contact unit in the natural coordinate system. After coordinate transformation, the node results are averaged, and the slip results under the global coordinate are obtained. Then the slip field of the contact region is obtained by interpolation according to the shape function. By using the post-processing program, three analytical steps are analyzed and studied one by one: the assembly stage. The slip results of each analysis step are calculated and the effects of different mesh sizes on the slip amplitude are analyzed respectively in the preloading and preloading stages. Finally, the causes of slippage and the factors affecting the structure are analyzed, and an improved scheme is put forward. The causes of the back-end slippage are analyzed from the aspects of structure form, load form and slip result, etc. Based on the above analysis, some structural shape parameters which have influence on fretting slip are put forward, and the influence is analyzed by the above calculation process. According to the analysis results of influencing factors, the scheme of structural improvement is put forward. The maximum slip amplitude of back-end interference is reduced from 40.0 渭 m to 8.8 渭 m.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH131.7

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