대형 선박용 엔진의 유한요소 모드 해석을 이용한 상태 공간 모델 개발에 관한 연구
(A) study of state space model using mode analysis by the finite elements method for the huge marine diesel engine
대형 선박 엔진 유한요소 모드 해석 상태 공간 모델;
- 원문 URL
This article provides a dynamic analysis model for huge marine engine that examined analytically variation effects of frequency response by fitting of transverse stays such as hydraulic type(Hydraulic Top Bracing). First, vibration analysis using the 3-dimensional finite element models for the huge marine engine has performed in order to find out the dynamic characteristics. Second, 3-dimensional finite elements model for the huge maine engine was modified so that generate forcing nodes in crosshead part and top bracing nodes in cylinder frame part. Third, A system matrix and output matrix was derived for the general siso (single input single output)state space model. finally, developed state space model for the 3-dimensional finite element model for the huge marine engine without the additional modifying process. This study concluded as : a) In detail marine diesel eigine using a commercial fem program, A model modification was possible without excessive increment of model dofs by dividing a volume for a necessary modification and then modeling by the coupling between the dividing volume. b) In commercial fem program, among the normalized eigenvectors to mass matrix after modal analysis, taken a necessary eigenvecctors being request for composition of state space model from normalized eigenvetors. accomplished the state space model that the number of the model dofs was decreased. c) In detail marine diesel eigine using a commercial fem program, abridged a additional modification process, through the state space model of a marine diesel engine was possible directly using results of dynamic characteristics analysis, the characteristics of a frequency response can be obtained without a additional simplification and loss of accuracy compare to the result by detailed fem model. e) result of this work, state space model seems to be more compatible with top bracing model be comopsed of simulink in matlab program, can be used on analysis of frequency-domain response and time-domain transient response.