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    Dynamic Modeling and Nonlinear Characteristics of a Cracked Bolt-Disk Combined Rotor System

    Source: Journal of Engineering for Gas Turbines and Power:;2021:;volume( 143 ):;issue: 009::page 091024-1
    Author:
    Liu, Yi
    ,
    Liu, Heng
    ,
    Li, Yuan
    ,
    Wang, Nanshan
    DOI: 10.1115/1.4051415
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Different from the crack on the rotating shaft, the crack on the bolt, which is a connecting part of the bolt-disk combined rotor, is a kind of local defect. The local crack on the bolt under high pretension is always in open state, and it increases the overall vibration of the combined rotor significantly in practice. This paper studies the modeling of the crack on the bolt and nonlinear dynamic behaviors of the cracked bolt-disk rotor system. The circumferential bolts with a transverse open crack are treated as several bar elements under the assumption that each bolt has the same original tensile extension length. The cracked correction coefficient is introduced to describe the decreasing amount of bolt's tension due to crack. After this coefficient is obtained according to finite element method, the stiffness matrix of circumferential bolts with crack is built based on total potential energy. The dynamic model consists of a time-independent stiffness matrix for perfect bolts, a time-variant reductive stiffness, and an additional moment. As a result, the crack in bolt reduces rotor's nonlinear stability and leads to greater vibration and fluctuation. In addition, crack depth has much larger influence than crack location on the dynamic behaviors.
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      Dynamic Modeling and Nonlinear Characteristics of a Cracked Bolt-Disk Combined Rotor System

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4278184
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    • Journal of Engineering for Gas Turbines and Power

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    contributor authorLiu, Yi
    contributor authorLiu, Heng
    contributor authorLi, Yuan
    contributor authorWang, Nanshan
    date accessioned2022-02-06T05:30:36Z
    date available2022-02-06T05:30:36Z
    date copyright8/9/2021 12:00:00 AM
    date issued2021
    identifier issn0742-4795
    identifier othergtp_143_09_091024.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4278184
    description abstractDifferent from the crack on the rotating shaft, the crack on the bolt, which is a connecting part of the bolt-disk combined rotor, is a kind of local defect. The local crack on the bolt under high pretension is always in open state, and it increases the overall vibration of the combined rotor significantly in practice. This paper studies the modeling of the crack on the bolt and nonlinear dynamic behaviors of the cracked bolt-disk rotor system. The circumferential bolts with a transverse open crack are treated as several bar elements under the assumption that each bolt has the same original tensile extension length. The cracked correction coefficient is introduced to describe the decreasing amount of bolt's tension due to crack. After this coefficient is obtained according to finite element method, the stiffness matrix of circumferential bolts with crack is built based on total potential energy. The dynamic model consists of a time-independent stiffness matrix for perfect bolts, a time-variant reductive stiffness, and an additional moment. As a result, the crack in bolt reduces rotor's nonlinear stability and leads to greater vibration and fluctuation. In addition, crack depth has much larger influence than crack location on the dynamic behaviors.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleDynamic Modeling and Nonlinear Characteristics of a Cracked Bolt-Disk Combined Rotor System
    typeJournal Paper
    journal volume143
    journal issue9
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4051415
    journal fristpage091024-1
    journal lastpage091024-8
    page8
    treeJournal of Engineering for Gas Turbines and Power:;2021:;volume( 143 ):;issue: 009
    contenttypeFulltext
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