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

  • topology optimization based on level set for a flexible Multibody System modeled via ancf
    Structural and Multidisciplinary Optimization, 2017
    Co-Authors: Jialiang Sun, Qiang Tian
    Abstract:

    A topology optimization methodology is proposed for the flexible Multibody System undergoing both large overall motion and large deformation. The System of concern is modeled via the absolute nodal coordinate formulation. The equivalent static load method is employed to transform the topology optimization of the nonlinear dynamic response of the System into a static one, and evaluated to adapt to the absolute nodal coordinate formulation by splitting the elastic deformations of the flexible components from the overall motions of those components. During the static topology optimization, the material interface is implicitly described as the zero level set of a higher-dimensional scalar function. Then, the semi-implicit level set method with the additive operator splitting algorithm is employed to solve the corresponding Hamilton-Jacobi partial differential equation. In addition, the expert evaluation method of weights based on the grey theory is utilized to define the objective function, and a modified augmented Lagrange multiplier method is proposed to treat the inequality volume constraint so as to avoid the oscillation and drift of the volume. Finally, two numerical examples are provided to validate the proposed methodology.

  • Model order reduction for dynamic simulation of a flexible Multibody System via absolute nodal coordinate formulation
    Computer Methods in Applied Mechanics and Engineering, 2017
    Co-Authors: Kai Luo, Haiyan Hu, Cheng Liu, Qiang Tian
    Abstract:

    The Absolute Nodal Coordinate Formulation (ANCF) can be used to model a flexible Multibody System subject to both overall motions and large deformations. With an increasing number of finite elements of ANCF to mesh flexible bodies, however, the computation cost will become extremely high. To improve the computational efficiency of ANCF for a large-scaled flexible Multibody System, a Systematic method is proposed in this study for the model order reduction based on the proper orthogonal decomposition and the Galerkin projection. At first, an approach for the selection of reduced constraint equations is proposed to deal with the singularity of the coefficient matrix of the Reduced-Order Model (ROM). Then, the computation of the reduced stiffness matrix and generalized force vector of the ROM are parallelized via the OpenMP directives. Afterwards, two parametric approaches are presented to make the ROM be adaptive to the change of System parameters. One is the interpolation approach of reduced-order basis vectors on a manifold to obtain the parametric ROM, and the other is the fast-to-slow ROM approach via the reduced-order basis vectors extracted from the fast dynamic responses to simulate slow dynamic responses. Finally, four numerical examples are given to validate the efficacy of the proposed method for the dynamic simulations of both rigid and flexible Multibody Systems.

  • structural optimization of flexible components in a flexible Multibody System modeled via ancf
    Mechanism and Machine Theory, 2016
    Co-Authors: Jialiang Sun, Qiang Tian
    Abstract:

    Abstract The paper presents how to optimize the flexible components in a flexible Multibody System undergoing both large overall motion and large deformation by using the Absolute Nodal Coordinate Formulation (ANCF) and the equivalent static load (ESL) method. Before the structural optimization, the flexible Multibody System is modeled via ANCF first so as to describe the coupled overall motion and large deformation accurately. During the structural optimization, the elastic deformation of the flexible component to be optimized is split from the overall motion of the flexible component, and then the equivalent static loads are determined by using the ESL method such that the structural optimization of nonlinear dynamic response can be transformed into a static one. In addition, the nonlinear interior point method is adopted to solve the corresponding structural optimization problem of nonlinear static response. The paper gives three numerical examples to validate the above optimization procedure. The final example of optimizing the arms in a rigid-flexible grasping robot shows that the proposed optimization procedure enables one to deal with realistic engineering Systems.

  • nonlinear dynamics and chaotic control of a flexible Multibody System with uncertain joint clearance
    Nonlinear Dynamics, 2016
    Co-Authors: Zhe Wang, Qiang Tian, Paulo Flores
    Abstract:

    The nonlinear dynamics of a flexible Multibody System with interval clearance size in a revolute joint is investigated in this work. The System is modeled by using a unified mesh of absolute nodal coordinate formulation (ANCF), that is, the flexible parts are meshed via the finite elements of the ANCF and the rigid parts are described via the ANCF reference nodes (ANCF-RNs). The kinetic models of all revolute joints are formulated by using ANCF reference node (ANCF-RN) coordinates. The influence of the Lund-Grenoble and the modified Coulomb’s friction models on the System dynamics is comparatively studied. The Chebyshev tensor product sampling method is used to generate the samples of the interval clearance size. With the purpose to maintain the continuous contact of the clearance joint, a modified extended delayed feedback control (EDFC) is used to stabilize the chaotic motion of the flexible Multibody System. Finally, the dynamics of a planar slider–crank mechanism with interval clearance size in a revolute joint is studied, as a benchmark example, to check the effectiveness of the presented computation method and the modified EDFC.

  • a new Multibody System approach for tire modeling using ancf finite elements
    Proceedings of the Institution of Mechanical Engineers Part K: Journal of Multi-body Dynamics, 2016
    Co-Authors: Mohil Patel, Qiang Tian, Grzegorz Orzechowski, Ahmed A. Shabana
    Abstract:

    This paper introduces a new computational Multibody System framework for developing accurate tire models using the finite element absolute nodal coordinate formulation (ANCF). Absolute nodal coordinate formulation finite elements are used to create the geometry and perform the finite element/Multibody System analysis of the tires. The computational procedure used in this study allows for modeling composite tires and for using a continuum-based air pressure and contact tire force models. The absolute nodal coordinate formulation tire mesh, which allows for high spinning speed, has a constant inertia matrix and zero Coriolis and centrifugal forces. The concept of the absolute nodal coordinate formulation reference node, introduced recently, is used to develop linear connectivity conditions between the tire tread and rim, thereby allowing for imposing these linear conditions at a preprocessing stage. Using this approach, the dependent variables are eliminated at a preprocessing stage before the start of the ...

Guoping Wang - One of the best experts on this subject based on the ideXlab platform.

  • theoretical modeling and numerical solution methods for flexible Multibody System dynamics
    Nonlinear Dynamics, 2019
    Co-Authors: Bao Rong, Xiaoting Rui, Ling Tao, Guoping Wang
    Abstract:

    Flexible Multibody System dynamics (MSD) is one of the hot spots and difficulties in modern mechanics. It provides a powerful theoretical tool and technical support for dynamic performance evaluation and optimization design of a large number of complex Systems in many engineering fields, such as machinery, aviation, aerospace, weapon, robot and biological engineering. How to find an efficient accurate dynamics modeling method and its stable reliable numerical solving algorithm are the two core problems of flexible MSD. In this paper, the research status of modeling methods of flexible MSD in recent years is summarized first, including the selection of reference frames, the flexible body’s kinematics descriptions, the deductions of dynamics equation, the model reduction techniques and the modeling methods of the contact/collision, uncertainty and multi-field coupling problems. Then, numerical solution technologies and their latest developments of flexible MSD are discussed in detail. Finally, the future research directions of modeling and numerical computation of flexible MSD are briefly prospected.

  • dynamics analysis and wave compensation control design of ship s seaborne supply by discrete time transfer matrix method of Multibody System
    Mechanical Systems and Signal Processing, 2019
    Co-Authors: Bao Rong, Guoping Wang, Xiaoting Rui, Ling Tao, Fufeng Yang
    Abstract:

    Abstract Real-time dynamics analysis and control of ship's seaborne supply (SSS) operations under complex sea conditions is a research hotspot in the fields of marine and ship engineering, mechanics and control engineering. In this paper, the discrete time transfer matrix method of Multibody System is proposed for dynamics modeling and analysis of a SSS System. This method solves the dynamics of System easily only by the low-order transfer equations, instead of the usual high-order global differential or differential-algebra equations of System; therefore, its computational efficiency is enhanced essentially. Then for improving the positioning precision and security of supply operations, a hybrid control System which is composed of three PD controllers and a fuzzy controller is designed to compensate the ship’s relative motion caused by sea waves. The formulas, dynamics algorithm and control design details are all presented. Some illustrative simulations show the proposed modeling method and control strategy are accurate and feasible, with low computational complexity and satisfying control performance.

  • study on automatic deduction method of overall transfer equation for tree Systems as well as closed loop and branch mixed Systems
    Advances in Mechanical Engineering, 2018
    Co-Authors: Lu Sun, Guoping Wang, Xiaoting Rui, Xue Rui
    Abstract:

    The transfer matrix method for Multibody Systems has been developed for 20 years and improved constantly. The new version of transfer matrix method for Multibody System and the automatic deduction ...

  • transfer matrix method for dynamics modeling and independent modal space vibration control design of linear hybrid Multibody System
    Mechanical Systems and Signal Processing, 2018
    Co-Authors: Bao Rong, Xiaoting Rui, Ling Tao, Guoping Wang
    Abstract:

    Abstract In this paper, an efficient method of dynamics modeling and vibration control design of a linear hybrid Multibody System (MS) is studied based on the transfer matrix method. The natural vibration characteristics of a linear hybrid MS are solved by using low-order transfer equations. Then, by constructing the brand-new body dynamics equation, augmented operator and augmented eigenvector, the orthogonality of augmented eigenvector of a linear hybrid MS is satisfied, and its state space model expressed in each independent model space is obtained easily. According to this dynamics model, a robust independent modal space-fuzzy controller is designed for vibration control of a general MS, and the genetic optimization of some critical control parameters of fuzzy tuners is also presented. Two illustrative examples are performed, which results show that this method is computationally efficient and with perfect control performance.

  • study on automatic deduction method of overall transfer equation for branch Multibody System
    Advances in Mechanical Engineering, 2016
    Co-Authors: Xue Rui, Guoping Wang, Xiaoting Rui, Jianshu Zhang, Lu Sun
    Abstract:

    The transfer matrix method for Multibody System is a new method developed in recent 20 years for studying Multibody System dynamics. The new version of transfer matrix method for Multibody System a...

Bao Rong - One of the best experts on this subject based on the ideXlab platform.

  • theoretical modeling and numerical solution methods for flexible Multibody System dynamics
    Nonlinear Dynamics, 2019
    Co-Authors: Bao Rong, Xiaoting Rui, Ling Tao, Guoping Wang
    Abstract:

    Flexible Multibody System dynamics (MSD) is one of the hot spots and difficulties in modern mechanics. It provides a powerful theoretical tool and technical support for dynamic performance evaluation and optimization design of a large number of complex Systems in many engineering fields, such as machinery, aviation, aerospace, weapon, robot and biological engineering. How to find an efficient accurate dynamics modeling method and its stable reliable numerical solving algorithm are the two core problems of flexible MSD. In this paper, the research status of modeling methods of flexible MSD in recent years is summarized first, including the selection of reference frames, the flexible body’s kinematics descriptions, the deductions of dynamics equation, the model reduction techniques and the modeling methods of the contact/collision, uncertainty and multi-field coupling problems. Then, numerical solution technologies and their latest developments of flexible MSD are discussed in detail. Finally, the future research directions of modeling and numerical computation of flexible MSD are briefly prospected.

  • dynamics analysis and wave compensation control design of ship s seaborne supply by discrete time transfer matrix method of Multibody System
    Mechanical Systems and Signal Processing, 2019
    Co-Authors: Bao Rong, Guoping Wang, Xiaoting Rui, Ling Tao, Fufeng Yang
    Abstract:

    Abstract Real-time dynamics analysis and control of ship's seaborne supply (SSS) operations under complex sea conditions is a research hotspot in the fields of marine and ship engineering, mechanics and control engineering. In this paper, the discrete time transfer matrix method of Multibody System is proposed for dynamics modeling and analysis of a SSS System. This method solves the dynamics of System easily only by the low-order transfer equations, instead of the usual high-order global differential or differential-algebra equations of System; therefore, its computational efficiency is enhanced essentially. Then for improving the positioning precision and security of supply operations, a hybrid control System which is composed of three PD controllers and a fuzzy controller is designed to compensate the ship’s relative motion caused by sea waves. The formulas, dynamics algorithm and control design details are all presented. Some illustrative simulations show the proposed modeling method and control strategy are accurate and feasible, with low computational complexity and satisfying control performance.

  • transfer matrix method for dynamics modeling and independent modal space vibration control design of linear hybrid Multibody System
    Mechanical Systems and Signal Processing, 2018
    Co-Authors: Bao Rong, Xiaoting Rui, Ling Tao, Guoping Wang
    Abstract:

    Abstract In this paper, an efficient method of dynamics modeling and vibration control design of a linear hybrid Multibody System (MS) is studied based on the transfer matrix method. The natural vibration characteristics of a linear hybrid MS are solved by using low-order transfer equations. Then, by constructing the brand-new body dynamics equation, augmented operator and augmented eigenvector, the orthogonality of augmented eigenvector of a linear hybrid MS is satisfied, and its state space model expressed in each independent model space is obtained easily. According to this dynamics model, a robust independent modal space-fuzzy controller is designed for vibration control of a general MS, and the genetic optimization of some critical control parameters of fuzzy tuners is also presented. Two illustrative examples are performed, which results show that this method is computationally efficient and with perfect control performance.

  • discrete time transfer matrix method for dynamics of Multibody System with flexible beams moving in space
    Acta Mechanica Sinica, 2012
    Co-Authors: Xiaoting Rui, Edwin Kreuzer, Bao Rong
    Abstract:

    In this paper, by defining new state vectors and developing new transfer matrices of various elements moving in space, the discrete time transfer matrix method of multi-rigid-flexible-body System is expanded to study the dynamics of Multibody System with flexible beams moving in space. Formulations and numerical example of a rigid-flexible-body three pendulums System moving in space are given to validate the method. Using the new method to study the dynamics of multi-rigid-flexible-body System moving in space, the global dynamics equations of System are not needed, the orders of involved matrices of the System are very low and the computational speed is high, irrespective of the size of the System. The new method is simple, straightforward, practical, and provides a powerful tool for multi-rigid-flexible-body System dynamics.

  • discrete time transfer matrix method for dynamics analysis of complex weapon Systems
    Science China-technological Sciences, 2011
    Co-Authors: Bao Rong, Guoping Wang, Bin He
    Abstract:

    Efficient, precise dynamic modeling and analysis for complex weapon Systems have become more and more important in their dynamic design and performance optimizing. As a new method developed in recent years, the discrete time transfer matrix method of Multibody System is highly efficient for Multibody System dynamics. In this paper, taking a shipboard gun System as an example, by deducing some new transfer equations of elements, the discrete time transfer matrix method of Multibody System is used to solve the dynamics problems of complex rigid-flexible coupling weapon Systems successfully. This method does not need the global dynamic equations of System and has the low order of System matrix, high computational efficiency. The proposed method has advantages for dynamic design of complex weapon Systems, and can be carried over straightforwardly to other complex mechanical Systems.

Xiaoting Rui - One of the best experts on this subject based on the ideXlab platform.

  • theoretical modeling and numerical solution methods for flexible Multibody System dynamics
    Nonlinear Dynamics, 2019
    Co-Authors: Bao Rong, Xiaoting Rui, Ling Tao, Guoping Wang
    Abstract:

    Flexible Multibody System dynamics (MSD) is one of the hot spots and difficulties in modern mechanics. It provides a powerful theoretical tool and technical support for dynamic performance evaluation and optimization design of a large number of complex Systems in many engineering fields, such as machinery, aviation, aerospace, weapon, robot and biological engineering. How to find an efficient accurate dynamics modeling method and its stable reliable numerical solving algorithm are the two core problems of flexible MSD. In this paper, the research status of modeling methods of flexible MSD in recent years is summarized first, including the selection of reference frames, the flexible body’s kinematics descriptions, the deductions of dynamics equation, the model reduction techniques and the modeling methods of the contact/collision, uncertainty and multi-field coupling problems. Then, numerical solution technologies and their latest developments of flexible MSD are discussed in detail. Finally, the future research directions of modeling and numerical computation of flexible MSD are briefly prospected.

  • dynamics analysis and wave compensation control design of ship s seaborne supply by discrete time transfer matrix method of Multibody System
    Mechanical Systems and Signal Processing, 2019
    Co-Authors: Bao Rong, Guoping Wang, Xiaoting Rui, Ling Tao, Fufeng Yang
    Abstract:

    Abstract Real-time dynamics analysis and control of ship's seaborne supply (SSS) operations under complex sea conditions is a research hotspot in the fields of marine and ship engineering, mechanics and control engineering. In this paper, the discrete time transfer matrix method of Multibody System is proposed for dynamics modeling and analysis of a SSS System. This method solves the dynamics of System easily only by the low-order transfer equations, instead of the usual high-order global differential or differential-algebra equations of System; therefore, its computational efficiency is enhanced essentially. Then for improving the positioning precision and security of supply operations, a hybrid control System which is composed of three PD controllers and a fuzzy controller is designed to compensate the ship’s relative motion caused by sea waves. The formulas, dynamics algorithm and control design details are all presented. Some illustrative simulations show the proposed modeling method and control strategy are accurate and feasible, with low computational complexity and satisfying control performance.

  • study on automatic deduction method of overall transfer equation for tree Systems as well as closed loop and branch mixed Systems
    Advances in Mechanical Engineering, 2018
    Co-Authors: Lu Sun, Guoping Wang, Xiaoting Rui, Xue Rui
    Abstract:

    The transfer matrix method for Multibody Systems has been developed for 20 years and improved constantly. The new version of transfer matrix method for Multibody System and the automatic deduction ...

  • transfer matrix method for dynamics modeling and independent modal space vibration control design of linear hybrid Multibody System
    Mechanical Systems and Signal Processing, 2018
    Co-Authors: Bao Rong, Xiaoting Rui, Ling Tao, Guoping Wang
    Abstract:

    Abstract In this paper, an efficient method of dynamics modeling and vibration control design of a linear hybrid Multibody System (MS) is studied based on the transfer matrix method. The natural vibration characteristics of a linear hybrid MS are solved by using low-order transfer equations. Then, by constructing the brand-new body dynamics equation, augmented operator and augmented eigenvector, the orthogonality of augmented eigenvector of a linear hybrid MS is satisfied, and its state space model expressed in each independent model space is obtained easily. According to this dynamics model, a robust independent modal space-fuzzy controller is designed for vibration control of a general MS, and the genetic optimization of some critical control parameters of fuzzy tuners is also presented. Two illustrative examples are performed, which results show that this method is computationally efficient and with perfect control performance.

  • study on automatic deduction method of overall transfer equation for branch Multibody System
    Advances in Mechanical Engineering, 2016
    Co-Authors: Xue Rui, Guoping Wang, Xiaoting Rui, Jianshu Zhang, Lu Sun
    Abstract:

    The transfer matrix method for Multibody System is a new method developed in recent 20 years for studying Multibody System dynamics. The new version of transfer matrix method for Multibody System a...

Ahmed A. Shabana - One of the best experts on this subject based on the ideXlab platform.

  • Durability analysis and implementation of the floating frame of reference formulation
    Proceedings of the Institution of Mechanical Engineers Part K: Journal of Multi-body Dynamics, 2017
    Co-Authors: Ahmed A. Shabana, Gengxiang Wang
    Abstract:

    The finite element floating frame of reference (FFR) formulation, implemented in most commercial Multibody System (MBS) computer programs, is widely used in the durability analysis by a large numbe...

  • a new Multibody System approach for tire modeling using ancf finite elements
    Proceedings of the Institution of Mechanical Engineers Part K: Journal of Multi-body Dynamics, 2016
    Co-Authors: Mohil Patel, Qiang Tian, Grzegorz Orzechowski, Ahmed A. Shabana
    Abstract:

    This paper introduces a new computational Multibody System framework for developing accurate tire models using the finite element absolute nodal coordinate formulation (ANCF). Absolute nodal coordinate formulation finite elements are used to create the geometry and perform the finite element/Multibody System analysis of the tires. The computational procedure used in this study allows for modeling composite tires and for using a continuum-based air pressure and contact tire force models. The absolute nodal coordinate formulation tire mesh, which allows for high spinning speed, has a constant inertia matrix and zero Coriolis and centrifugal forces. The concept of the absolute nodal coordinate formulation reference node, introduced recently, is used to develop linear connectivity conditions between the tire tread and rim, thereby allowing for imposing these linear conditions at a preprocessing stage. Using this approach, the dependent variables are eliminated at a preprocessing stage before the start of the ...

  • a total lagrangian ancf liquid sloshing approach for Multibody System applications
    Journal of Computational and Nonlinear Dynamics, 2015
    Co-Authors: Cheng Wei, Liang Wang, Ahmed A. Shabana
    Abstract:

    The objective of this investigation is to develop a total Lagrangian non-incremental liquid sloshing solution procedure based on the finite element (FE) absolute nodal coordinate formulation (ANCF). The proposed liquid sloshing modeling approach can be used to avoid the difficulties of integrating most of fluid dynamics formulations, which are based on the Eulerian approach, with Multibody System (MBS) dynamics formulations, which are based on a total Lagrangian approach. The proposed total Lagrangian FE fluid dynamics formulation, which can be Systematically integrated with computational MBS algorithms, differs significantly from the conventional FE or finite volume methods which are based on an Eulerian representation that employs the velocity field of a fixed control volume in the region of interest. The ANCF fluid equations are expressed in terms of displacement and gradient coordinates of material points, allowing for straight forward implementation of kinematic constraint equations and for the Systematic modeling of the interaction of the fluid with the external environment or with rigid and flexible bodies. The fluid incompressibility conditions and surface traction forces are considered and derived directly from the Navier Stokes equations. Two ANCF brick elements, one is obtained using an incomplete polynomial representation and the other is obtained from a B-spline volume representation, are used. The new approach ensures the continuity of the displacement gradients at the nodal points and allows for imposing higher degree of continuity across the element interface by applying algebraic constraint equations that can be used to eliminate dependent variables and reduce the model dimensionality. Regardless of the magnitude of the fluid displacement, the fluid has a constant mass matrix, leading to zero Coriolis and centrifugal forces. The analysis presented in this paper demonstrates the feasibility of developing an efficient non-incremental total Lagrangian approach for modeling sloshing problems in MBS System applications in which the bodies can experience large displacements including finite rotations. Several examples are presented in order to shed light on the potential of using the ANCF liquid sloshing formulation developed in this study.Copyright © 2015 by ASME

  • ancf tire assembly model for Multibody System applications
    Journal of Computational and Nonlinear Dynamics, 2015
    Co-Authors: Ahmed A. Shabana
    Abstract:

    The aim of this paper is to propose a new numerical approach for modeling tires in Multibody System (MBS) applications. In this approach, the tires, including the rigid rim, are modeled using one mesh developed using the finite element (FE) absolute nodal co-ordinate formulation (ANCF). The FE tire mesh, which allows for high spinning speed, has a constant inertia matrix and zero Coriolis and centrifugal forces. The connectivity conditions between the tire tread and rim are imposed at a preprocessing stage using linear constraint equations, thereby allowing for the elimination of dependent variables before the start of the simulation. The concept of the rim node is introduced in this paper to allow for the tire/axle assembly in MBS vehicle simulations. The rim node, which is not associated with a particular FE, is used to define the inertia of the rim, treated in this investigation as a rigid body. The procedure for evaluating the inertia coefficients associated with the rim node gradients is described. It is shown how fully parameterized ANCF beam and plate elements can be used to develop new tire geometry that captures details that cannot be captured using existing tire models. The concept of mixed ANCF FEs can also be used with both higher order fully parameterized and gradient deficient ANCF FEs to obtain a better distribution of the tire contact forces.

  • ancf reference node for Multibody System analysis
    Proceedings of the Institution of Mechanical Engineers Part K: Journal of Multi-body Dynamics, 2015
    Co-Authors: Ahmed A. Shabana
    Abstract:

    The objective of this short communication is to introduce the important concept of the absolute nodal coordinate formulation reference node (ANCF-RN), a concept that can be used effectively to deve...