齒輪箱的主要振源來自減速器內(nèi)部的齒輪、軸和軸承等轉(zhuǎn)動系統(tǒng)。振動的能量產(chǎn)生于輪齒的嚙合面,之后通過齒輪傳遞到軸,然后從軸傳遞到軸承,最后振動能量通過軸承座由軸承向齒輪箱擴(kuò)散。這些能量一部分被齒輪箱的結(jié)構(gòu)阻尼所吸收,其余的能量成為了齒輪箱的激勵。當(dāng)齒輪箱的固有頻率和激勵力頻率相等時,由于共振的原因,便導(dǎo)致了破壞性振動。 通過采用以下兩種方法可以避免破壞性振動的發(fā)生：一是修改齒輪箱的結(jié)構(gòu)設(shè)計,二是在齒輪箱上增加肋板。第一種方法是通過改變齒輪箱的壁厚來改變其固有頻率,使其避開齒輪嚙合頻率(GMF)；第二種方法是在齒輪箱的振動最劇烈處增加肋板來減小振動的幅度。 本文對二級傳動齒輪箱用以上兩種方法來模擬固有頻率的改變和降低振動幅值,計算機(jī)仿真是在MSC. Partarn和Nastran里實(shí)現(xiàn)的。 通過模態(tài)分析,得到了齒輪箱的固有頻率和陣型,其中接近GMF的固有頻率被提取出來進(jìn)行靈敏度分析,在本文中對應(yīng)的是第4,5和6階固有頻率。靈敏度分析是計算齒輪箱上箱體頂部、上箱體壁,下箱體前壁和側(cè)壁的厚度對結(jié)構(gòu)特征值的改變率�；陟`敏度分析的結(jié)果,可以發(fā)現(xiàn)齒輪箱的上箱體頂部和上箱體壁可以使結(jié)構(gòu)的固有頻率移動超...

【文章頁數(shù)】：84 頁

【學(xué)位級別】：碩士

【文章目錄】：
ABSTRACT
摘要
Chapter 1 Introduction
    1.1 Background
    1.2 Objective and scope of work
    1.3 Organization of the thesis
Chapter 2 Literature Review
    2.1 Mechanism of gearbox vibration and noise
    2.2 Dynamic analysis
    2.3 Modal Analysis
        2.3.1 Effect of exciting displacement on vibration
        2.3.2 Effect of frequency on vibration
        2.3.3 Effect of damping on vibration
    2.4 Design sensitivity and optimization for low vibration
    2.5 Effect of Stiffeners
Chapter 3 Gearbox Geometric and Finite Element Model
    3.1 Gearbox Geometric modeling
    3.2 Gearbox Finite EIement Modeling
    3.3 RSSSCON Shell to Solid Transition
    3.4 Stiffeners Added on Top Wall of Shell-Solid Finite Element Modeling
    3.5 Summary
Chapter 4 Modal Analysis
    4.1 Normal modes Analysis
    4.2 Solid Gearbox Modes and Mode shapes
        4.2.1 First mode and mode shapes
        4.2.2 Fourth mode and mode shapes
        4.2.3 Twentieth mode and mode shapes
    4.3 Shell-Solid Gearbox Modal Analysis
    4.4 Effect of Stiffeners on Modal Analysis
    4.5 Summary
Chapter 5 Real Eigenvalue Sensitivity Analysis
    5.1 Realeigen value sensitivity
    5.2 Gear Mesh Frequency
    5.3 Design variables
    5.4 Design Properties:
    5.5 Design Objective
    5.6 Design Response
    5.7 Design Constraint
    5.8 Real Eigenvalue Sensitivity Analysis Results:
        5.8.1 Real Eigenfrequency Analysis of Top Casing:
        5.8.2 Real Eigenfrequency Analysis of Top Wall
        5.8.3 Real Eigenfrequency Analysis of Base Front Wall
        5.8.4 Real Eigenfrequency Analysis of Base Side Wall
    5.9 Summary
Conclusion
Future Work
References
Acknowledgement



本文編號：3928445