The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Gu Qing-hua - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic Simulation of Cylinder Shell under Underwater Explosion Load
    Computer Simulation, 2009
    Co-Authors: Gu Qing-hua
    Abstract:

    Cylinder shell is an important component of Ship and submarine and Structure of ocean engineering.Studying its response to underwater explosion load is very important for increasing the lifecycle of Structure.The experiment of dynamic effect of Ship Structure produced by underwater shock and explosion bubble has been numerically simulated with LS-DYNA.And dynamic responses of different material and different parameter composite cylinder shell to underwater explosion load are analyzed.The results show that composite has higher anti-impact capability than steel,copper and aluminum and composite with smaller elastic modulus has higher anti-impact capability.The anti-impact can be calculated simply and quickly with this method which provides some references for design of Ship Structure.

Chris K. Mechefske - One of the best experts on this subject based on the ideXlab platform.

  • A study of vibration and vibration control of Ship Structures
    Marine Structures, 2009
    Co-Authors: Tian Ran Lin, Jie Pan, Peter O'shea, Chris K. Mechefske
    Abstract:

    This paper examines the vibration characteristics and vibration control of complex Ship Structures. It is shown that input mobilities of a Ship Structure at engine supports, due to out-of-plane force or bending moment excitations, are governed by the flexural stiffness of the engine supports. The frequency averaged input mobilities of the Ship Structure, due to such excitations, can be represented by those of the corresponding infinite beam. The torsional moment input mobility at the engine support can be estimated from the torsional response of the engine bed section under direct excitation. It is found that the inclusion of Ship hull and deck plates in the Ship Structure model has little effect on the frequency-averaged response of the Ship Structure. This study also shows that vibration propagation in complex Ship Structures at low frequencies can be attenuated by imposing irregularities to the ring frame locations in Ships. Vibration responses of Ship Structures due to machinery excitations at higher frequencies can be controlled by structural modifications of the local supporting Structures such as engine beds in Ships.

  • Vibration control of Ship Structures
    2008
    Co-Authors: Tian Ran Lin, Chris K. Mechefske
    Abstract:

    Two control approaches are presented in this paper for the vibration control of Ship Structures. One aims to control vibration energy transmission from vibrating machinery to a Ship Structure by modifying the input mobility of the local supporting Structure. Another aims to control vibration energy propagation in the Ship Structure by introducing irregularities to the ring frame locations. Four structural modifications are proposed in the first approach. The effect of the modifications to the force and moment input mobility at the engine mount locations is discussed. It is found that vibration energy transmission from a mechanical source to the Ship Structure can be controlled by structural modifications of the local supporting Structure. In the second approach, we found that vibration of the Ship Structure at low frequencies can be confined at the source section by moving some of the ring frames away from their respective periodic locations

  • INPUT MOBILITY OF Ship StructureS
    2008
    Co-Authors: Tian Ran Lin, Chris K. Mechefske
    Abstract:

    This paper studies the fundamental features and the control mechanism of input mobilities of a complex Ship Structure by utilizing the well-established finite element analysis method. It is shown that the input mobility of a Ship Structure due to out-of-plane force and bending moment excitations at the engine mount locations is controlled by the bending stiffness of engine supports. The frequency averaged input mobility can be represented by that of the corresponding infinite beam. The input mobility due to an in-plane force excitation is bounded by those of the corresponding finite and infinite beams. The torsional moment input mobility can be predicted by the input mobility of the source engine bed section bounded by two consecutive ring frames attributed to the comparatively large in-plane stiffness of the ring frames. It is illustrated that the frequency averaged Ship structural response is almost unaffected by neglecting the Ship hull and deck plates in the analysis

Ye Heng-kui - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue strength assessment of typical spots in a large LNGC based on spectral method
    Ocean Engineering, 2010
    Co-Authors: Ye Heng-kui
    Abstract:

    Based on Miner′s rule of linear damage accumulation and S-N curves,the fatigue life of 160 000m3 LNGC is predicated by employing the spectral-based analysis.First,a finite element model of the Ship Structure was built.Then,the principal stress transfer functions of hot spots and the distribution coefficient of band width are calculated at different wave frequencies in several wave headings.The fatigue lives of the hot spots are evaluated and assessed using wave scatter diagrams for the North Atlantic as wave loading spectrum.The result can offer the reference for the similar LNG Ship design and development.

  • Overall Strength Assessment of LNG Ship Structures Based on the Direct Computing Method
    2010
    Co-Authors: Ye Heng-kui
    Abstract:

    The overall strength assessment of a 160000m3 LNG Ship Structure was carried out based on direct computation. First, a finite element model of the Ship Structure was built. The extreme vertical wave bending moments were calculated based on 3-D hydrodynamic and long term prediction using North Atlantic scatter diagram. The design wave parameters were determined for typical load condition. The overall strength was estimated in design wave load. The results showed are effective for strength assessment of LNG Ship Structures and structural optimization. The assessment results can be a reference in the design and development of LNG Ship Structures

Tian Ran Lin - One of the best experts on this subject based on the ideXlab platform.

  • A study of vibration and vibration control of Ship Structures
    Marine Structures, 2009
    Co-Authors: Tian Ran Lin, Jie Pan, Peter O'shea, Chris K. Mechefske
    Abstract:

    This paper examines the vibration characteristics and vibration control of complex Ship Structures. It is shown that input mobilities of a Ship Structure at engine supports, due to out-of-plane force or bending moment excitations, are governed by the flexural stiffness of the engine supports. The frequency averaged input mobilities of the Ship Structure, due to such excitations, can be represented by those of the corresponding infinite beam. The torsional moment input mobility at the engine support can be estimated from the torsional response of the engine bed section under direct excitation. It is found that the inclusion of Ship hull and deck plates in the Ship Structure model has little effect on the frequency-averaged response of the Ship Structure. This study also shows that vibration propagation in complex Ship Structures at low frequencies can be attenuated by imposing irregularities to the ring frame locations in Ships. Vibration responses of Ship Structures due to machinery excitations at higher frequencies can be controlled by structural modifications of the local supporting Structures such as engine beds in Ships.

  • Vibration control of Ship Structures
    2008
    Co-Authors: Tian Ran Lin, Chris K. Mechefske
    Abstract:

    Two control approaches are presented in this paper for the vibration control of Ship Structures. One aims to control vibration energy transmission from vibrating machinery to a Ship Structure by modifying the input mobility of the local supporting Structure. Another aims to control vibration energy propagation in the Ship Structure by introducing irregularities to the ring frame locations. Four structural modifications are proposed in the first approach. The effect of the modifications to the force and moment input mobility at the engine mount locations is discussed. It is found that vibration energy transmission from a mechanical source to the Ship Structure can be controlled by structural modifications of the local supporting Structure. In the second approach, we found that vibration of the Ship Structure at low frequencies can be confined at the source section by moving some of the ring frames away from their respective periodic locations

  • INPUT MOBILITY OF Ship StructureS
    2008
    Co-Authors: Tian Ran Lin, Chris K. Mechefske
    Abstract:

    This paper studies the fundamental features and the control mechanism of input mobilities of a complex Ship Structure by utilizing the well-established finite element analysis method. It is shown that the input mobility of a Ship Structure due to out-of-plane force and bending moment excitations at the engine mount locations is controlled by the bending stiffness of engine supports. The frequency averaged input mobility can be represented by that of the corresponding infinite beam. The input mobility due to an in-plane force excitation is bounded by those of the corresponding finite and infinite beams. The torsional moment input mobility can be predicted by the input mobility of the source engine bed section bounded by two consecutive ring frames attributed to the comparatively large in-plane stiffness of the ring frames. It is illustrated that the frequency averaged Ship structural response is almost unaffected by neglecting the Ship hull and deck plates in the analysis

Wenpeng Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic response of a surface Ship Structure subjected to an underwater explosion bubble
    Marine Structures, 2014
    Co-Authors: Nu Zhang, Zhi Zong, Wenpeng Zhang
    Abstract:

    Abstract Bubble load in a noncontact underwater explosion can cause the Ship hull global response and local response. In current literature, the Ship hull is usually simplified as a hull girder to analyze its global response. However, literature dealt with the local response of a 3-D surface Ship hull subjected to an underwater bubble were limited. This investigation develops a procedure which couples the finite element method with doubly asymptotic approximation (DAA) method to study the problem of transient responses of a Ship hull Structure subjected to an underwater explosion bubble. Using a 3-D Ship model as examples, the global and local responses of the Ship model in vertical, transverse and longitudinal directions are performed in detail. The acceleration, velocity and displacement time histories are presented. The characteristics of both the global and local responses of the Ship model are discussed. The numerical results show that besides global whipping response, the Ship hull also sustains severe local responses in different directions subjected to underwater explosion bubble jetting, which should be taken into consideration.