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Non-destructive Quality Evaluation of Watermelon and Melon Based on Its Acoustic Properties and Dynamic Finite Element Analysis

Acknowledgements第17-19页
Abstract第19页
Chapter 1 General Introduction第24-28页
Chapter 2 Literature Review第28-56页
    2.1 Introduction第28-29页
    2.2 USD A Quality Grade第29页
    2.3 Maturity and ripening第29-37页
        2.3.1 Definition of maturity第30页
        2.3.2 Terminology第30-31页
            2.3.2.1 Ripeness and physiological maturity第30-31页
            2.3.2.2 Changes in fruit as it approaches maturity第31页
        2.3.3 Characteristics of maturity index第31页
        2.3.4 Requirements for maturity indices第31-32页
        2.3.5 Method to determine maturity第32-35页
        2.3.6 Quality issues for melons第35页
        2.3.7 Optimal quality第35-36页
        2.3.8 Components of harvest index第36-37页
    2.4 Testing techniques第37-39页
    2.5 Firmness第39-43页
    2.6 Impact第43-45页
    2.7 Sonic vibration第45-51页
    2.8 Elastic and viscoelastic behavior第51-52页
    2.9 Vibration mode shape第52-55页
    2.10 Conclusion第55-56页
Chapter 3 Finite Element Based Modal Analysis of the Dynamic Behavior of Melons第56-70页
    3.1 Introduction第56-57页
    3.2 Theory and modeling第57-64页
    3.3 Solution approaches第64-68页
        3.3.1 Calculation methods第64-66页
            3.3.1.1 Selection of MDOF第64-65页
            3.3.1.2 Matrix reduction第65-66页
        3.3.2 Eigenvalue and eigenvector extraction第66-68页
    3.4 Simulation model steps第68-69页
    3.5 Summary第69-70页
Chapter 4 General Materials and Methods第70-80页
    4.1 Introduction第70-71页
    4.2 Materials and methods第71-78页
        4.2.1 Experimental procedure第71页
        4.2.2 Plant material第71页
        4.2.3 Fruit parameter measurement第71-73页
            4.2.3.1 Dimension measurement第71-72页
            4.2.3.2 Fruit mass measurement第72页
            4.2.3.3 Density measurement第72-73页
            4.2.3.4 Young's modulus第73页
        4.2.4 Firmness measurement parameter第73-74页
        4.2.5 Experimental setup第74-76页
            4.2.5.1 Accessories parts第76页
                4.2.5.1.1 Main frame device第76页
                4.2.5.1.2 Adjustable sliding part第76页
                4.2.5.1.3 Triangle第76页
                4.2.5.1.4 Square bulb water balance第76页
        4.2.6 Measurement of acoustic response of fruits第76-78页
    4.3 Summary第78-80页
Chapter 5 Finite Element Modal of Watermelon and its Application第80-91页
    5.1 Introduction第80-81页
    5.2 Methods and materials第81-83页
        5.2.1 Theory and analysis第81-82页
        5.2.2 Experimental setup第82页
        5.2.3 Method第82-83页
            5.2.3.1 Acoustic impulse - response method第82页
            5.2.3.2 Measurement of firmness第82-83页
    5.3 Finite element modeling of ellipsoidal revolution第83-85页
    5.4 Results and discussion第85-90页
        5.4.1 Vibration shape analysis of finite element model第85-89页
        5.4.2 Selected of location and direction of force excitation and measurement sensor第89-90页
    5.5 Conclusions第90-91页
Chapter 6 Determination of Acoustic Vibration in Watermelon by Finite Element Modeling第91-107页
    6.1 Introduction第91-93页
    6.2 Materials第93页
        6.2.1 Fruits第93页
        6.2.2 Ball impactor types第93页
    6.3 Measurement of acoustic response of watermelons第93-95页
    6.4 Firmness measurement第95页
    6.5 Finite element modeling第95-99页
    6.6 Results and discussion第99-107页
        6.6.1 Comparison of FE results with experimental measurements第99页
        6.6.2 Mode shape of the watermelon in vibration第99-100页
        6.6.3 Effect of testing location around the equator of the fruit第100-103页
        6.6.4 Relationship between the resonant frequency and firmness第103-104页
        6.6.5 Relationship between the resonant frequency and Young's modulus第104页
        6.6.6 Relationships between the resonant frequency and stiffness factors 82 6.7 Conclusions第104-107页
Chapter 7 Quality Evaluation of Watermelon第107-118页
    7.1 Introduction第107页
    7.2 Materials and methods第107-109页
        7.2.1 Fruits第107-108页
        7.2.2 Equipments第108页
        7.2.3 Measurement of acoustic impulse - response of fruits第108页
        7.2.4 Measurement of firmness of fruits第108-109页
    7.3 Theory and analysis第109-111页
    7.4 Results and discussion第111-116页
        7.4.1 Vibration shape analysis of finite element model第111-113页
        7.4.2 Mode shapes of the watermelon in vibration第113-114页
        7.4.3 Comparison of FE with experimental results第114-115页
        7.4.4 Relationship between resonance frequency and watermelon firmness第115-116页
    7.5 Conclusion第116-118页
Chapter 8 Firmness Evaluation of Melon第118-131页
    8.1 Introduction第118-119页
    8.2 Materials and methods第119-122页
        8.2.1 Materials第119页
            8.2.1.1 Fruit第119页
            8.2.1.2 Impactor type第119页
        8.2.2 Experimental determination of the spherical resonant frequency第119-120页
        8.2.3 Firmness measurement第120-121页
        8.2.4 Experimental determination of static elastic modulus第121-122页
    8.3 Finite element simulation of the dynamic properties of intact melons第122-123页
    8.4 Results and discussion第123-129页
        8.4.1 Mode shapes of the melon in vibration第123-126页
        8.4.2 Location and direction of force excitation and measurement sensors第126页
        8.4.3 Effect of types of impactor on natural frequency第126-128页
        8.4.4 Relations among resonant frequency, stiffness factor and firmness第128-129页
        8.4.5 Elastic modulus of different tested layers第129页
    8.5 Conclusions第129-131页
Chapter 9 Main Conclusions第131-133页
Chapter 10 Bibliography第133-154页
Publication第154页

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