• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.1197-1202
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• 2007

The paper deals with the structural analysis and vibration test for the scaffolding system of LNG cargo containment. The eight-stories scaffolding system has telescopic area, working area, coner area and storage area in real system. In the structural analysis, the maximum displacement and stress of the each floor for the scaffolding system are investigated by finite element method. In the vibrational analysis, the natural frequencies and mode shapes for 8-stories scaffolding system of the LNG cargo containment are investigated. In order to compare theoretical natural frequencies with experimental ones, small size of 2-step scaffolding structure is used, and the theoretical results for natural frequency have a good agreement with experimental ones.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.20 no.6
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• pp.546-554
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• 2010

The paper deals with the structural analysis and vibration test for the scaffolding system of LNG cargo containment. The eight-stories scaffolding system has telescopic area, working area, coner area and storage area in real system. In the structural analysis, the maximum displacement and stress of the each floor for the scaffolding system are investigated by finite element method. In the vibrational analysis, the natural frequencies and mode shapes for 8-stories scaffolding system of the LNG cargo containment are investigated. In order to compare theoretical natural frequencies with experimental ones, small size of 2-step scaffolding structure is used, and the theoretical results for natural frequency have a good agreement with experimental ones.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.299-304
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• 2008

Dynamic characteristics of smart hull structure are investigated and active vibration control performance is evaluated. Dynamic model of smart hull structure with surface bonded Macro-fiber Composite (MFC) actuators is established by analytical method. Equations of motion of the host hull structure are derived based on Donnell-Mushtari equilibrium equations for a thin cylindrical shell. A general model for the interaction between hull structure and MFC actuator is included in the dynamic model. Modal analysis is then conducted and mode shapes and corresponding natural frequencies are investigated. After constructing of the optimal control algorithm, active vibration control performance of the proposed system is evaluated. It has been shown that structural vibration can be reduced effectively with proper control input.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.18 no.8
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• pp.832-840
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• 2008

Dynamic characteristics of smart hull structure are investigated and active vibration control performance is evaluated. Dynamic model of smart hull structure with surface bonded macro-fiber composite(MFC) actuators is established by analytical method. Equations of motion of the host hull structure are derived based on Donnell-Mushtari equilibrium equations for a thin cylindrical shell. A general model for the interaction between hull structure and MFC actuator is included in the dynamic model. Modal analysis is then conducted and mode shapes and corresponding natural frequencies are investigated. After constructing of the optimal control algorithm, active vibration control performance of the proposed system is evaluated. It has been shown that structural vibration can be reduced effectively with proper control input.

• Computational Structural Engineering
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• v.5 no.3
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• pp.139-146
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• 1992

Vibrational behaviors of highway girder bridges due to heavy traffics are discussed, and empirical formulae for impact factors are suggested in this paper. Appropriate vehicle model for vibration analysis is found and impact factors are calculated with different surface roughnesses, vehicle speeds and span lengths. It is shown that the present codes tend to underestimate impact factors.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1994.04a
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• pp.39-44
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• 1994

본 문에서는 조화기진력(harmonic force) 하에서 보조변수법을 적용한 연속법이 사용되어 선형구조물의 변위, 응력에 대한 치수 설계 민감도가 계산되었다. 또한 최적설계가 조화 하중의 경우에 시도되어 주어진 제한조건들을 만족하며 최소 중량이 계산되었다.

• Computational Structural Engineering
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• v.5 no.2
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• pp.87-91
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• 1992

Vibrational behaviors of highway girder bridges due to heavy traffics are discussed, and empirical formulae for impact factors are suggested in this paper. Appropriate vehicle model for vibration analysis is found and impact factors are calculated with different surface roughnesses, vehicle speeds and span lengths. It is shown that the present codes tend to underestimate impact factors.

• Computational Structural Engineering
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• v.7 no.3
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• pp.123-131
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• 1994

This paper is concerned with a new concept of vibration control in which thermal stresses are utilized. Thermal actuators are used to generate thermal stresses in a vibrating beam. The thermal actuators are found to work successfully as the control means. Especially the proposed control method in this paper can be effectively applied to the large space structures with low natural frequencies rather than to the structures with high natural frequencies. In the process of control design, various control methods including optimal-robust control method are investigated. Through numerical simulations, it is found that the robust-optimal control method can be efficiently with the vibration control of a cantilever beam using thermal stresses.

• The Journal of the Acoustical Society of Korea
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• v.4 no.3
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• pp.21-32
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• 1985

서로 상관관계가 있는 다입력원 진동계의 진동원을 규명하기 위한 방법을 제안하였다. 다차원 스펙트럼 해석을 이용함으로써 지하철 진동의 가장 중요한 진동원을 발견하였다. 이 분석은 진동의 전 달경로가 매우 복잡할 때 다입력-단일출력으로 모델화 하여 분석하는 방법이다. 또한 레지듀 스펙트럼 분석과 부분기여함수의 개념을 적용하여 지하철 진동이 콘크리트 구조물의 진동에 미치는 영향을 마이 크로 컴퓨터로 계산하였다. 이러한 연구의 결과로 지하철 진동의 다차원 스펙트럼의 오버올레벨을 측정 치와 비교하였다.

• Computational Structural Engineering
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• v.9 no.3
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• pp.135-143
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• 1996

The differential equations governing both the free vibrations and buckling loads of tapered beam-columns of circular cross-section with constant volume are derived and solved numerically. The effects of axial load are included in the differential equations. The parabolic equation is chosen as the variable radius of circular cross-section for the tapered beam-column. In numerical examples, the clamped-clamped, clamped-hinged and hinged-hinged end constraints are considered. The variations of the frequency parameters and buckling load parameters with the non-dimensional system parameters are presented in figures and the configurations of strongest columns are obtained.