發(fā)布時間：2018-06-05 19:22

  本文選題：濕式雙離合器 + 濕式摩擦片��； 參考：《吉林大學(xué)》2011年碩士論文

【摘要】：濕式雙離合自動變速器具有傳統(tǒng)機械式變速器的傳動效率高、安裝空間緊密、質(zhì)量輕便,并且同時擁有自動變速器換檔平順、燃油經(jīng)濟性較高等優(yōu)點。濕式雙離合器在國內(nèi)發(fā)展時間較晚,正處在一個學(xué)習(xí)與探索的階段,但是隨著我國改革開放的進一步深入,對于汽車行業(yè)的發(fā)展也越來越重視。因此,我們通過借助國外的一些先進經(jīng)驗,更深層次的學(xué)習(xí)和研究濕式雙離合器技術(shù),為我國自動變速器的自主開發(fā)提供更多的參考依據(jù)。 本文以吉林省科技發(fā)展計劃項目《汽車關(guān)鍵核心技術(shù)(吉林省汽車自主創(chuàng)新聯(lián)合行動)》為依托,吉林省科學(xué)技術(shù)廳委托吉林大學(xué)承擔(dān)吉林省科技發(fā)展計劃中的雙離合器自動變速器(DCT)開發(fā)關(guān)鍵技術(shù)項目的科研任務(wù)。本文結(jié)合該項目重點對濕式雙離合器摩擦片油槽的流場特性分析進行深入研究,通過計算流體力學(xué)仿真軟件對冷卻油在摩擦片三種典型油槽的內(nèi)流場和主、從動摩擦片的對流換熱情況進行仿真分析并對帶排扭矩進行計算。文章正文內(nèi)容共分為五個部分來敘述： 第一部分通過濕式雙離合器自動變速器的結(jié)構(gòu)與工作原理,了解濕式摩擦片的工作環(huán)境。基于對當前國內(nèi)外濕式雙離合器自動變速器的發(fā)展需求,結(jié)合省廳的濕式雙離合器(DCT)關(guān)鍵技術(shù)開發(fā)的科技項目,了解到當前國內(nèi)外的專家、學(xué)者越來越關(guān)注濕式摩擦片表面溝槽對于摩擦片摩擦特性的影響,但是基于計算流體力學(xué)技術(shù)的研究卻很少。介于這種情況,提出本文研究內(nèi)容的思想,利用計算流體力學(xué)技術(shù)對冷卻油在摩擦片表面溝槽的流場特性進行仿真分析。 第二部分基于計算流體力學(xué)技術(shù),為本文的流場分析以及對流換熱提出數(shù)學(xué)計算模型。濕式離合器內(nèi)冷卻油可看成一種三維非穩(wěn)態(tài)、帶旋轉(zhuǎn)的不規(guī)則湍流流動。流場數(shù)值計算的本質(zhì)就是對離散后的控制方程組進行求解,即對控制方程在控制區(qū)域內(nèi)進行積分以建立包括各種相關(guān)離散變量的代數(shù)方程組,然后進行求解。而摩擦片破壞方式多為高溫引起摩擦偶件的變形、開裂或燒蝕,冷卻油液在摩擦片表面溝槽內(nèi)與主、動從摩擦片之間的熱交換情況,也成是本文研究的一個重點。 第三部分主要是搭建摩擦片油槽流場特性仿真模型。利用三維制圖軟件UG,創(chuàng)建三種典型油槽結(jié)構(gòu)。然后導(dǎo)入網(wǎng)格劃分軟件Gambit中進行模型簡化,并且對單元類型、網(wǎng)格類型、邊界類型、區(qū)域類型及其他相關(guān)選項設(shè)置后進行網(wǎng)格劃分,最終得出與求解域完全對應(yīng)的網(wǎng)格模型。 第四部分利用計算流體力學(xué)軟件Fluent分別對徑向油槽、方形槽、太陽射線槽進行內(nèi)流場和對流換熱的仿真分析。并且根據(jù)速度矢量值和溫度值來對比三種油槽的流場特性的優(yōu)劣。 第五部分委托摩擦片生產(chǎn)單位試制徑向油槽摩擦片并進行臺架試驗,分別為定輸入轉(zhuǎn)速,變進口流量和定進口流量,變輸入轉(zhuǎn)速兩種工況進行數(shù)據(jù)采集,并與仿真結(jié)果的對比,驗證仿真結(jié)果與試驗結(jié)果基本吻合。針對濕式離合器工作狀況的模擬,利用計算流體力學(xué)仿真軟件得出的數(shù)值結(jié)果,對于濕式離合器摩擦片的研究具有很高的參考價值。 最后進行全文總結(jié),介紹了工作中遇到的重點、難點,并且指明此次仿真結(jié)果的不足,提出今后進一步研究的方向。
[Abstract]:The wet double clutch automatic transmission has the advantages of high transmission efficiency, tight installation space and light quality, and also has the advantages of smooth shift gear and high fuel economy at the same time. The wet type dual clutch is developing late in China and is in a stage of study and exploration, but with the reform of our country With the further development of the opening, more and more attention has been paid to the development of the automobile industry. Therefore, through the use of some advanced foreign experience, we can study and study the wet double clutch technology in a deeper level, and provide more reference for the autonomous development of the automatic transmission in China.
Based on the Jilin provincial science and technology development project, the key core technology of automobile (Jilin auto innovation joint action), the Department of science and technology of Jilin commissioned the Jilin University to undertake the research task of the key technical project of the development of the dual clutch transmission (DCT) in the science and technology development plan of Jilin province. This paper combines the key points of the project. The flow field characteristic analysis of the wet double clutch friction plate oil tank is deeply studied. Through the calculation of the fluid mechanics simulation software, the internal flow field of the cooling oil in three typical oil grooves and the convection heat transfer of the main and the driven friction plate are simulated and calculated. The content of the article is divided into five parts. To describe:
In the first part, through the structure and working principle of the wet double clutch automatic transmission, the working environment of the wet friction friction disc is understood. Based on the development requirement of the current wet double clutch automatic transmission at home and abroad, and the scientific and technological project developed by the key technology of the wet double clutch (DCT) in the provincial office, the experts and scholars at home and abroad are understood. More and more attention is paid to the influence of the surface grooves on the friction characteristics of the friction plates, but the research based on computational fluid mechanics is very few. In this case, the idea of the content of this paper is put forward, and the flow field characteristics of the cooling oil in the surface groove of the friction plate are simulated and analyzed by the computational fluid dynamics.
The second part is based on the computational fluid dynamics (CFD), and proposes a mathematical model for the flow field analysis and convection heat transfer in this paper. The internal cooling oil in the wet clutch can be regarded as a three-dimensional unsteady, irregular turbulent flow with rotating. The essence of the numerical calculation is to solve the discrete control equations, that is, the control equation is in the control equation. In the control area, the integral in order to establish a set of algebraic equations including a variety of discrete variables is established and then solved. The failure mode of the friction disc is mostly caused by the deformation, cracking or ablation of the friction pairs. The heat exchange between the cooling oil in the groove surface of the friction plate and the main motion from the friction plate is also a study of this paper. Focus.
The third part is mainly to build the simulation model of the flow field characteristics of the oil tank of the friction plate. By using the 3D graphics software UG, three typical oil groove structures are created. Then the grid partition software Gambit is introduced to simplify the model, and the grid type, the grid type, the boundary type, the region type and the other related options are set up, and the final mesh is divided, finally, the grid is divided. A mesh model which is completely corresponding to the solution domain is obtained.
In the fourth part, the computational fluid dynamics software Fluent is used to simulate the internal flow field and the convection heat transfer of the radial oil tank, the square groove and the solar ray slot, and the flow field characteristics of the three kinds of oil tanks are compared according to the velocity vector value and the temperature value.
The fifth part of the production unit of the entrustment friction plate produces the radial oil tank friction plate and carries on the bench test. The data collection is carried out for the fixed input speed, the variable inlet flow rate and the fixed inlet flow rate and the variable input speed, and compared with the simulation results, the simulation results are basically consistent with the test results. The working shape of the wet clutch is done. The numerical results obtained from CFD simulation software have a high reference value for the study of wet clutch friction disc.
Finally, the paper summarizes the main points and difficulties encountered in the work, and points out the shortcomings of the simulation results, and puts forward the direction for further research.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH132.46

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本文編號：1983143