当前位置:主页 > 科技论文 > 船舶论文 >

拖网渔船推进轴系振动特性分析与优化

发布时间:2023-05-28 12:37
  确保动力从主发动机传输至螺旋桨,是船舶推进系统设计的重要任务,因此必须充分评估推进轴系的振动特性。推进轴系振动包括扭转、纵向、横向和耦合振动,这些振动对推进轴系的性能将产生不利影响。横向振动对轴系的影响显着,将导致轴系产生弯曲和扭曲,容易导致螺旋桨周围流体发生非均匀流动,同时引起轴系工作失衡。对于不同类型的船只,推进轴系的工作条件是不同的。拖网渔船推进轴系的工作环境相当复杂。沿海地区对拖网渔船的需求日益增加,对提高其性能的需求也随之增长。由于拖网位于渔船的尾部,容易引起不稳定和波动,特别容易引发推进系统的振动。因此随着对拖网渔船性能要求的不断提高,需要对拖网渔船的振动特性进行进一步的研究。推进轴系振动对拖网渔船整体性能的影响十分突出,可以说是拖网渔船整体性能的关键。在结构设计的各个阶段,采用有限元法进行振动分析已成为一种标准方法。采用有限元法进行结构设计,能够对结构可能出现的问题,在结构建造之前,就进行分析和补救。了解结构的固有频率、振型和最大变形,是确定危险区域及其受影响区域并防止结构破坏的关键。因此,本研究的目的是在对拖网渔船结构建模的基础上,分析拖网渔船的运行工况和振动特性,优化...

【文章页数】:110 页

【学位级别】:硕士

【文章目录】:
Abstract
摘要
1 Introduction and Literature Review
    1.1 Overview
    1.2 Research Background and Motivation
    1.3 Basic Terms and Concepts of Vibrations
    1.4 Vibration Calculation Methods
    1.5 Research Status
    1.6 Research Objective
    1.7 Thesis Overview
    Chapter Summary
2 Basic Theory of Vibration of Trawler Propulsion Shafting
    2.1 Overview
    2.2 Basic Theory of Vibration
    2.3 Basic Algorithms for Eigenvalues of the Vibration
        2.3.1 Basic Theory
        2.3.2 Critical Speed Calculation
        2.3.3 Mode Shape Calculation
    2.4 Factors affecting Transverse Vibrations
        2.4.1 Bearing Contact and Attached Water Effect
        2.4.2 Stress Stiffening and Rotational Softening Effects
    Chapter Summary
3 Model Creation of Trawler Ship Structure in SolidWorks
    3.1 Overview
    3.2 Basic Terminologies related to Ship Structure
    3.3 Design Parameters with Labeling of Trawler Ship Structure
        3.3.1 Shaft
        3.3.2 Propeller
        3.3.3 Ship Hull
    3.4 Procedure of Model Creation of Trawler Ship Hull
    3.5 Procedure of Model Creation of Shaft and Propeller
    3.6 Assembly Process
    Chapter Summary
4 Testing and Simulation Verification of Vibration Characteristics of Experimental Trawler Propulsion Shafting
    4.1 Overview
    4.2 Simulation of Trawler Propulsion Shafting
        4.2.1 Fundamentals of Modal Analysis
        4.2.2 Modeling and Analysis Process
    4.3 Experimental Testing of Trawler Propulsion Shafting
        4.3.1 Fundamentals of Fast Fourier Transform(FFT)
        4.3.2 Testing Apparatus
        4.3.3 Experimental Platform
        4.3.4 Testing Procedure
    4.4 Comparative Analysis of ANSYS Simulation and Experimental Testing Results
    Chapter Summary
5 Vibration Characteristics Analysis of Real Trawler Propulsion Shafting based on ANSYS
    5.1 Overview
    5.2 Modal Analysis of Real Trawler Propulsion Shafting
        5.2.1 Analysis Process
        5.2.2 Campbell Diagram
    5.3 Comparative Analysis of Modal Parameters based on ANSYS and MATLAB
        5.3.1 Based on ANSYS
        5.3.2 Based on MATLAB
        5.3.3 Results and Discussions
    5.4 Harmonic Response Analysis of Real Trawler Propulsion Shafting
        5.4.1 Analysis Process
    Chapter Summary
6 Principles of Contacts simulation and Vibration Characteristics Analysis of Propulsion Shafting with considering Hull of Trawler Ship
    6.1 Overview
    6.2 Principles of Contacts Simulation of Propulsion Shafting with Hull of Trawler Ship
        6.2.1 Basic Concepts of Surface Contacts
        6.2.2 Types of Contacts
        6.2.3 Formulations of Contacts
        6.2.4 Contacts Analysis of Shaft line with Hull
    6.3 Vibration Characteristics Analysis of Propulsion Shafting with considering Hull of Trawler Ship
        6.3.1 Modal Analysis of Propulsion Shafting
        6.3.2 Modal Analysis of Propulsion Shafting with considering Trawler Ship Hull
    6.4 Comparative Analysis and Discussions
    Chapter Summary
7 Optimization Scheme to Reduce the Vibration Characteristics of Trawler Propulsion Shafting
    7.1 Overview
    7.2 Optimization Scheme
        7.2.1 Goal Driven Optimization
        7.2.2 Design Optimization
        7.2.3 Optimization considering Parameters Collectively
    7.3 Optimization Comparative Results and Discussions
    Chapter Summary
8 Conclusions and Recommendations
    8.1 Conclusion
    8.2 Recommendations for future work
Appendix A
Appendix B
Appendix C
Appendix D
References
Acknowledgement
Author Profile
Advisor Profile



本文编号:3824603

资料下载
论文发表

本文链接:https://www.wllwen.com/kejilunwen/chuanbolw/3824603.html


Copyright(c)文论论文网All Rights Reserved | 网站地图

版权申明:资料由用户acb4a***提供,本站仅收录摘要或目录,作者需要删除请E-mail邮箱[email protected]