確保動力從主發(fā)動機(jī)傳輸至螺旋槳,是船舶推進(jìn)系統(tǒng)設(shè)計的重要任務(wù),因此必須充分評估推進(jìn)軸系的振動特性。推進(jìn)軸系振動包括扭轉(zhuǎn)、縱向、橫向和耦合振動,這些振動對推進(jìn)軸系的性能將產(chǎn)生不利影響。橫向振動對軸系的影響顯著,將導(dǎo)致軸系產(chǎn)生彎曲和扭曲,容易導(dǎo)致螺旋槳周圍流體發(fā)生非均勻流動,同時引起軸系工作失衡。對于不同類型的船只,推進(jìn)軸系的工作條件是不同的。拖網(wǎng)漁船推進(jìn)軸系的工作環(huán)境相當(dāng)復(fù)雜。沿海地區(qū)對拖網(wǎng)漁船的需求日益增加,對提高其性能的需求也隨之增長。由于拖網(wǎng)位于漁船的尾部,容易引起不穩(wěn)定和波動,特別容易引發(fā)推進(jìn)系統(tǒng)的振動。因此隨著對拖網(wǎng)漁船性能要求的不斷提高,需要對拖網(wǎng)漁船的振動特性進(jìn)行進(jìn)一步的研究。推進(jìn)軸系振動對拖網(wǎng)漁船整體性能的影響十分突出,可以說是拖網(wǎng)漁船整體性能的關(guān)鍵。在結(jié)構(gòu)設(shè)計的各個階段,采用有限元法進(jìn)行振動分析已成為一種標(biāo)準(zhǔn)方法。采用有限元法進(jìn)行結(jié)構(gòu)設(shè)計,能夠?qū)Y(jié)構(gòu)可能出現(xiàn)的問題,在結(jié)構(gòu)建造之前,就進(jìn)行分析和補救。了解結(jié)構(gòu)的固有頻率、振型和最大變形,是確定危險區(qū)域及其受影響區(qū)域并防止結(jié)構(gòu)破壞的關(guān)鍵。因此,本研究的目的是在對拖網(wǎng)漁船結(jié)構(gòu)建模的基礎(chǔ)上,分析拖網(wǎng)漁船的運行工況和振動特性,優(yōu)化...

【文章頁數(shù)】：110 頁

【學(xué)位級別】：碩士

【文章目錄】：
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



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