基于实特征值灵敏度的二级传动齿轮箱减振研究
发布时间：2024-03-15 02:54
齿轮箱的主要振源来自减速器内部的齿轮、轴和轴承等转动系统。振动的能量产生于轮齿的啮合面,之后通过齿轮传递到轴,然后从轴传递到轴承,最后振动能量通过轴承座由轴承向齿轮箱扩散。这些能量一部分被齿轮箱的结构阻尼所吸收,其余的能量成为了齿轮箱的激励。当齿轮箱的固有频率和激励力频率相等时,由于共振的原因,便导致了破坏性振动。 通过采用以下两种方法可以避免破坏性振动的发生：一是修改齿轮箱的结构设计,二是在齿轮箱上增加肋板。第一种方法是通过改变齿轮箱的壁厚来改变其固有频率,使其避开齿轮啮合频率(GMF)；第二种方法是在齿轮箱的振动最剧烈处增加肋板来减小振动的幅度。 本文对二级传动齿轮箱用以上两种方法来模拟固有频率的改变和降低振动幅值,计算机仿真是在MSC. Partarn和Nastran里实现的。 通过模态分析,得到了齿轮箱的固有频率和阵型,其中接近GMF的固有频率被提取出来进行灵敏度分析,在本文中对应的是第4,5和6阶固有频率。灵敏度分析是计算齿轮箱上箱体顶部、上箱体壁,下箱体前壁和侧壁的厚度对结构特征值的改变率。基于灵敏度分析的结果,可以发现齿轮箱的上箱体顶部和上箱体壁可以使结构的固有频率移动超...
【文章页数】：84 页
【学位级别】：硕士
【文章目录】：
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
本文编号：3928445
【文章页数】：84 页
【学位级别】：硕士
【文章目录】：
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
本文编号：3928445
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