The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform

Zheng H. Zhu - One of the best experts on this subject based on the ideXlab platform.

  • Flight Dynamics and Control Strategy of Electric Solar Wind Sails
    Journal of Guidance Control and Dynamics, 2020
    Co-Authors: Zheng H. Zhu
    Abstract:

    This paper studies the flight dynamics and control strategy for electric solar wind sails based on the Nodal Position finite element method, where the coupling effects between tether dynamics and t...

  • A high accurate hamiltonian Nodal Position finite element method for spatial cable structures undergoing long-term large overall motion
    Communications in Nonlinear Science and Numerical Simulation, 2019
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    Abstract This paper addresses the challenges faced by the error accumulation over long-term numerical calculation for dynamic modeling of spatial flexible cable structures undergoing large translational and rotational motion. A high accurate Hamiltonian Nodal Position finite element method is proposed to deal with the challenges. The new Nodal Position finite element discrete formulation is derived by Hamiltonian theory and Green strain theory with full expression of global stiffness matrices without additional simplifications. Symplectic difference algorithm is built for numerical solution to optimally preserve the energy, momenta and area (volume) of the phase space. Forth-order closed Newton-Cotes numerical integration is applied to calculate the aerodynamic drag force. The Symplectic conservation feature of the proposed method is validated by the dynamics of a long-period classical pendulum. The numerical accuracy and stability of the proposed method are validated by LS-DYNA simulations for a flexible polyethylene rubber conical pendulum, the experiments of a three-dimensional circularly towed cable and the experiments of a free swing cable. The present algorithm is compared with the conventional second-order Runge-Kutta algorithm. All validations and comparisons indicate that the proposed method is stable and highly accurate.

  • Three-Dimensional High-Fidelity Dynamic Modeling of Tether Transportation System with Multiple Climbers
    Journal of Guidance Control and Dynamics, 2019
    Co-Authors: Gefei Shi, Zheng H. Zhu
    Abstract:

    This paper studies the dynamics of a tether transportation system by the Nodal Position finite element method in the framework of an arbitrary Lagrangian–Eulerian description. Material coordinate i...

  • A virtual experiment for partial space elevator using a novel high-fidelity FE model
    Nonlinear Dynamics, 2018
    Co-Authors: Gefei Shi, Zhanxia Zhu, Zheng H. Zhu
    Abstract:

    This paper developed a high-fidelity virtual experiment for a partial space elevator using Nodal Position finite element method with arbitrary Lagrangian–Eulerian description. The new method is designed to test the effectiveness of the optimal control strategies derived from a simplified two-piece dumbbell model for the orbital transfer of a partial space elevator. In the current work, the partial space elevator is modeled by the Nodal Position finite element method with arbitrary Lagrangian–Eulerian description. A novel technique is introduced to describe the movement of the climber along the tether by variable-length elements. The optimal trajectory of the climber’s velocity is derived from the optimal control and then is input to the finite element model to conduct a virtual experiment. The dynamic responses of the elevator resulted from the newly proposed finite element approach and the widely used simple approach are in good agreement. It shows the newly developed Nodal Position finite element method with arbitrary Lagrangian–Eulerian description is high fidelity, which can provide an effective virtual experimental environment to verify the effectiveness of libration control strategies based on the simplified two-piece dumbbell model.

  • Hamiltonian Nodal Position Finite Element Method for Cable Dynamics
    International Journal of Applied Mechanics, 2017
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    This paper developed a new Hamiltonian Nodal Position finite element method (FEM) to treat the nonlinear dynamics of cable system in which the large rigid-body motion is coupled with small elastic ...

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

  • A high accurate hamiltonian Nodal Position finite element method for spatial cable structures undergoing long-term large overall motion
    Communications in Nonlinear Science and Numerical Simulation, 2019
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    Abstract This paper addresses the challenges faced by the error accumulation over long-term numerical calculation for dynamic modeling of spatial flexible cable structures undergoing large translational and rotational motion. A high accurate Hamiltonian Nodal Position finite element method is proposed to deal with the challenges. The new Nodal Position finite element discrete formulation is derived by Hamiltonian theory and Green strain theory with full expression of global stiffness matrices without additional simplifications. Symplectic difference algorithm is built for numerical solution to optimally preserve the energy, momenta and area (volume) of the phase space. Forth-order closed Newton-Cotes numerical integration is applied to calculate the aerodynamic drag force. The Symplectic conservation feature of the proposed method is validated by the dynamics of a long-period classical pendulum. The numerical accuracy and stability of the proposed method are validated by LS-DYNA simulations for a flexible polyethylene rubber conical pendulum, the experiments of a three-dimensional circularly towed cable and the experiments of a free swing cable. The present algorithm is compared with the conventional second-order Runge-Kutta algorithm. All validations and comparisons indicate that the proposed method is stable and highly accurate.

  • Hamiltonian Nodal Position Finite Element Method for Cable Dynamics
    International Journal of Applied Mechanics, 2017
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    This paper developed a new Hamiltonian Nodal Position finite element method (FEM) to treat the nonlinear dynamics of cable system in which the large rigid-body motion is coupled with small elastic ...

  • Hamiltonian Nodal Position Finite Element Method for Cable Dynamics
    International Journal of Applied Mechanics, 2017
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    This paper developed a new Hamiltonian Nodal Position finite element method (FEM) to treat the nonlinear dynamics of cable system in which the large rigid-body motion is coupled with small elastic cable elongation. The FEM is derived from the Hamiltonian theory using canonical coordinates. The resulting Hamiltonian finite element model of cable contains low frequency mode of rigid-body motion and high frequency mode of axial elastic deformation, which is prone to numerical instability due to error accumulation over a very long period. A second-order explicit Symplectic integration scheme is used naturally to enforce the conservation of energy and momentum of the Hamiltonian finite element system. Numerical analyses are conducted and compared with theoretical and experimental results as well as the commercial software LS-DYNA. The comparisons demonstrate that the new Hamiltonian Nodal Position FEM is numerically efficient, stable and robust for simulation of long-period motion of cable systems.

Gefei Shi - One of the best experts on this subject based on the ideXlab platform.

  • Three-Dimensional High-Fidelity Dynamic Modeling of Tether Transportation System with Multiple Climbers
    Journal of Guidance Control and Dynamics, 2019
    Co-Authors: Gefei Shi, Zheng H. Zhu
    Abstract:

    This paper studies the dynamics of a tether transportation system by the Nodal Position finite element method in the framework of an arbitrary Lagrangian–Eulerian description. Material coordinate i...

  • A virtual experiment for partial space elevator using a novel high-fidelity FE model
    Nonlinear Dynamics, 2018
    Co-Authors: Gefei Shi, Zhanxia Zhu, Zheng H. Zhu
    Abstract:

    This paper developed a high-fidelity virtual experiment for a partial space elevator using Nodal Position finite element method with arbitrary Lagrangian–Eulerian description. The new method is designed to test the effectiveness of the optimal control strategies derived from a simplified two-piece dumbbell model for the orbital transfer of a partial space elevator. In the current work, the partial space elevator is modeled by the Nodal Position finite element method with arbitrary Lagrangian–Eulerian description. A novel technique is introduced to describe the movement of the climber along the tether by variable-length elements. The optimal trajectory of the climber’s velocity is derived from the optimal control and then is input to the finite element model to conduct a virtual experiment. The dynamic responses of the elevator resulted from the newly proposed finite element approach and the widely used simple approach are in good agreement. It shows the newly developed Nodal Position finite element method with arbitrary Lagrangian–Eulerian description is high fidelity, which can provide an effective virtual experimental environment to verify the effectiveness of libration control strategies based on the simplified two-piece dumbbell model.

Yongfeng Luo - One of the best experts on this subject based on the ideXlab platform.

  • Stochastic Deviation Method of Calculating Nodal Positions of Existing Spatial Structures
    Structural Health Monitoring 2017, 2017
    Co-Authors: Jun Liu, Yongfeng Luo
    Abstract:

    According to the uncertainty and the inherent randomness of Nodal Positions of existing spatial structures, a stochastic deviation method (SDM) was proposed to calculate the Nodal Positions and to reckon the geometric shapes. Taking into account the random characteristics of spatial structures, sampling principles and an approach to calculating minimum sample size in the SDM were given. Deriving from probability and statistics theory, the procedure for inferring the probabilistic distributions of the Nodal Position deviations were proposed. The proposed SDM was adopted to reckon the geometric shape of a reticulated shell structure, and the nonlinear static stability analysis were carried out using the structural spatial Position determined by the SDM. It was shown that the SDM can give more realistic results and can be used for the assessment of existing spatial structures.

Huaiping Ding - One of the best experts on this subject based on the ideXlab platform.

  • A high accurate hamiltonian Nodal Position finite element method for spatial cable structures undergoing long-term large overall motion
    Communications in Nonlinear Science and Numerical Simulation, 2019
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    Abstract This paper addresses the challenges faced by the error accumulation over long-term numerical calculation for dynamic modeling of spatial flexible cable structures undergoing large translational and rotational motion. A high accurate Hamiltonian Nodal Position finite element method is proposed to deal with the challenges. The new Nodal Position finite element discrete formulation is derived by Hamiltonian theory and Green strain theory with full expression of global stiffness matrices without additional simplifications. Symplectic difference algorithm is built for numerical solution to optimally preserve the energy, momenta and area (volume) of the phase space. Forth-order closed Newton-Cotes numerical integration is applied to calculate the aerodynamic drag force. The Symplectic conservation feature of the proposed method is validated by the dynamics of a long-period classical pendulum. The numerical accuracy and stability of the proposed method are validated by LS-DYNA simulations for a flexible polyethylene rubber conical pendulum, the experiments of a three-dimensional circularly towed cable and the experiments of a free swing cable. The present algorithm is compared with the conventional second-order Runge-Kutta algorithm. All validations and comparisons indicate that the proposed method is stable and highly accurate.

  • Hamiltonian Nodal Position Finite Element Method for Cable Dynamics
    International Journal of Applied Mechanics, 2017
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    This paper developed a new Hamiltonian Nodal Position finite element method (FEM) to treat the nonlinear dynamics of cable system in which the large rigid-body motion is coupled with small elastic ...

  • Hamiltonian Nodal Position Finite Element Method for Cable Dynamics
    International Journal of Applied Mechanics, 2017
    Co-Authors: Huaiping Ding, Zheng H. Zhu, Xiaochun Yin, Lin Zhang
    Abstract:

    This paper developed a new Hamiltonian Nodal Position finite element method (FEM) to treat the nonlinear dynamics of cable system in which the large rigid-body motion is coupled with small elastic cable elongation. The FEM is derived from the Hamiltonian theory using canonical coordinates. The resulting Hamiltonian finite element model of cable contains low frequency mode of rigid-body motion and high frequency mode of axial elastic deformation, which is prone to numerical instability due to error accumulation over a very long period. A second-order explicit Symplectic integration scheme is used naturally to enforce the conservation of energy and momentum of the Hamiltonian finite element system. Numerical analyses are conducted and compared with theoretical and experimental results as well as the commercial software LS-DYNA. The comparisons demonstrate that the new Hamiltonian Nodal Position FEM is numerically efficient, stable and robust for simulation of long-period motion of cable systems.