비선형 최소제곱법을 이용한 점탄성 감쇠를 갖는 원통셸의 실험진동해석
Experimental Vibration Analysis for Viscoelastically Damped Circular Cylindrical Shell Using Nonlinear Least Square Method
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초록
It is a recent trend for advanced ships and submarines to incorporate composite structureswith viscoelastically damping material. Much research has been done on curve-fitting techniquesto identify vibration characteristic parameters such as natural frequencies, modal damping ratios, and mode shapes of the composite structure. In this study, an advanced technique for accurately determining vibration characteristic of a circular cylindrical shell-attached viscoelastically damping material is used, based on a multi-degree of freedom (MDOF) curve-fitting method. First, an initial value is obtained by using a linear least square method. Next,using the initial value, the exact modal parameters of the composite circular cylindrical shell are obtained by using a nonlinear least square method. Results show computation time is greatly decreased and accurate results are obtained by the MDOF curve-fitting method.
Abstract
It is a recent trend for advanced ships and submarines to incorporate composite structureswith viscoelastically damping material. Much research has been done on curve-fitting techniquesto identify vibration characteristic parameters such as natural frequencies, modal damping ratios, and mode shapes of the composite structure. In this study, an advanced technique for accurately determining vibration characteristic of a circular cylindrical shell-attached viscoelastically damping material is used, based on a multi-degree of freedom (MDOF) curve-fitting method. First, an initial value is obtained by using a linear least square method. Next,using the initial value, the exact modal parameters of the composite circular cylindrical shell are obtained by using a nonlinear least square method. Results show computation time is greatly decreased and accurate results are obtained by the MDOF curve-fitting method.
참고문헌 (5)
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- Ibrahim,S.R., "A Method for the Direct Identification of Vibration Parameters from the free Response", The Shock and Vibration Bulletin, 47(4), pp.183~ (1977)
- Mergeay,M., "Multi Degree of Freedom Parameter Estimation Methods for Modal Analysis", Annals of the CIRP, 31, pp.269~ (1982)
- Nagamatsu, A., "Modal Analysis", ~ (1985)
- Van Loon,P., "Parameters of Mechanical Structures", Ph. D., pp.1974