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대형 선박 엔진의 동역학적 모델링에 관한 연구 원문보기

  • 저자

    정종하

  • 학위수여기관

    昌原大學校

  • 학위구분

    국내석사

  • 학과

    機械工學科

  • 지도교수

  • 발행년도

    2003

  • 총페이지

    iv, 37장.

  • 키워드

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T8935983&outLink=K  

  • 초록

    This article provides a dynamic modeling methodology of engines to be accurate with a small number of degrees of freedom for an active vibration control using a top brace. First, a finite element (FE) model for the engine structure is constructed so that the size of model is as small as possible where the dynamic characteristics of engine are ensured. Second, a technique is studied to obtain the exact mass and stiffness matrices of the FE model. The FE model still be too large to apply. Finally, a model reduction is, therefore, conducted to make an appropriate dynamic model for designing and simulating a top brace. In this article, a dynamic model of a huge 9 cylinder engine is constructed and reviewed for simulating a top brace. This study concluded as : (a) A dynamic model of 9 cylinder engine was constructed for analysis in the low frequency range near rigid body modes. Natural frequencies obtained by modal analysis of the model have good agreement with those from test data provided by manufacturer. The modeling technique will be very helpful. (b) A technique was presented to obtain the exact mass and stiffness matrices of the model from ANSYS. An important notice was also stated, that is, the Mass21 element and the coupling command in ANSYS should not be used in modeling. (c) The ANSYS FE model was reduced to the selected DOF model. The reduced model was reviewed by comparing to ANSYS FE model with the results for the eigenvalue analysis and forced vibration


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