發(fā)布時(shí)間：2019-02-21 14:55

【摘要】：近年來,可變壓縮比技術(shù)和可變配氣機(jī)構(gòu)得到了迅猛的發(fā)展,其目的都是為了使內(nèi)燃機(jī)具有更好的經(jīng)濟(jì)性以及動(dòng)力性。本文研究了一款多連桿單缸發(fā)動(dòng)機(jī),在原機(jī)模型上設(shè)計(jì)了一套可變壓縮比機(jī)構(gòu),相對(duì)原機(jī)來說,新機(jī)可以實(shí)現(xiàn)壓縮比的連續(xù)可調(diào)。并且還考慮到一種可變配氣技術(shù),來實(shí)現(xiàn)進(jìn)排氣門開啟關(guān)閉以及升程的變化。在設(shè)計(jì)的時(shí)候充分利用到虛擬樣機(jī)技術(shù),提供給實(shí)體機(jī)加工必須得數(shù)據(jù)參考,節(jié)約開發(fā)成本和時(shí)間。 本文主要包含了以下幾個(gè)主要研究?jī)?nèi)容: (1)介紹了一種新型多連桿可變壓縮比模型的建立過程,強(qiáng)調(diào)了其中幾個(gè)關(guān)鍵部件結(jié)構(gòu)的設(shè)計(jì)特點(diǎn)和功能。之后結(jié)合虛擬樣機(jī)技術(shù)構(gòu)建了完善的單缸可變壓縮比可變配氣機(jī)構(gòu)發(fā)動(dòng)機(jī)虛擬樣機(jī)模型,進(jìn)行了活塞連桿及配氣機(jī)構(gòu)的運(yùn)動(dòng)學(xué)分析。最后導(dǎo)入BOOST軟件模擬的氣缸壓力曲線,實(shí)現(xiàn)新機(jī)的多體動(dòng)力學(xué)分析。 (2)模型設(shè)計(jì)完成之后,考慮到單缸機(jī)的振動(dòng)和噪聲,重新設(shè)計(jì)了新機(jī)的平衡系統(tǒng),由于采用多連桿設(shè)計(jì),本文重新分析了慣性力的產(chǎn)生情況,設(shè)計(jì)了多套平衡裝置,并且最后通過最優(yōu)化方法來找出平衡機(jī)構(gòu)最佳設(shè)計(jì)和安裝的最佳位置。 (3)最后使用到ANSYS WORKBENCH軟件來對(duì)新機(jī)中關(guān)鍵零部件(上連桿,擺桿,下連桿等)實(shí)現(xiàn)有限元分析,計(jì)算它們的應(yīng)力應(yīng)變狀況以及強(qiáng)度和疲勞分析。結(jié)合ADAMS/auto FLEX模塊對(duì)連桿、擺桿實(shí)現(xiàn)柔性化設(shè)計(jì),并分析其和剛性體對(duì)比的結(jié)果。
[Abstract]:In recent years, the technology of variable compression ratio and variable valve train have been developed rapidly. The purpose of these technologies is to make the internal combustion engine have better economy and power performance. In this paper, a multi-link single-cylinder engine is studied, and a set of variable compression ratio mechanism is designed on the original machine model. Compared with the original engine, the new engine can realize the continuous adjustable compression ratio. A variable valve technology is also considered to realize the opening and closing of inlet and exhaust valve and the change of lift. The virtual prototyping technology is fully utilized in the design, and the data reference must be obtained for the physical machining, which saves the development cost and time. The main contents of this paper are as follows: (1) the establishment of a new multi-link variable compression ratio model is introduced, and the design features and functions of several key components are emphasized. Then a perfect virtual prototype model of a single cylinder variable compression ratio variable valve train engine is constructed with virtual prototyping technology. The kinematics analysis of piston connecting rod and valve train mechanism is carried out. Finally, the cylinder pressure curve simulated by BOOST software is introduced to realize the multi-body dynamics analysis of the new machine. (2) after the model design is completed, considering the vibration and noise of the single cylinder machine, the balancing system of the new machine is redesigned. Finally, the optimal design and installation position of the balancing mechanism is found by the optimization method. (3) at last, the ANSYS WORKBENCH software is used to realize the finite element analysis of the key parts (upper connecting rod, pendulum rod, lower connecting rod, etc.), and to calculate their stress-strain condition, strength and fatigue analysis. The flexible design of connecting rod and pendulum rod is realized with ADAMS/auto FLEX module, and the results of comparison with rigid body are analyzed.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH113;TK401

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