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Multibody Dynamics Using Quasi Energy andMomentum Conservative Algorithm Implemented with a Novel Four-Node Co-Rotational Quadrilateral Shell Element 认领 引用
1
作者 Zhongxue Li Yu Peng +2 位作者 JinXu Loc Vu-Quoc Bassam A.Izzuddin 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第7期255-286,共32页
This paper proposes a computational theory for multibody dynamics based on a novel co-rotational formulation of a four-node quadrilateral shell element,designed to address nonlinear dynamic problems in flexible multib... This paper proposes a computational theory for multibody dynamics based on a novel co-rotational formulation of a four-node quadrilateral shell element,designed to address nonlinear dynamic problems in flexible multibody systems undergoing arbitrarily large displacements and rotations.To circumvent the numerical inefficiency caused by the asymmetric tangent stiffness matrix in conventional co-rotational approaches,an incrementally additive vectorial rotational variable is introduced,which ensures the symmetry of the element’s tangent stiffness matrix in both global and local coordinate systems.The adoption of this vectorial rotational variable substantially improves computational efficiency and numerical stability.Hamilton’s principle is employed to derive the system’s dynamic equilibrium differential equation.For time integration,a generalized midpoint scheme coupled with a quasi energy–momentum conservative algorithm is used.This scheme ensures nearly exact conservation of the system’s total energy,linear momentum,and angular momentum in long-term simulations.The accuracy and stability of the proposed methodology are verified through four benchmark cases:an L-shaped plate,a ruler-shaped plate,a hemispherical shell with an 18°top opening,and a non-smooth shell-three intersecting plates.The results indicate that after the external loads are removed,the system’s total energy,total linear momentum,and total angular momentum are conserved with near-exact precision.The numerical results show excellent agreement with reference solutions from prior publications,and the computational process remains robustly stable. 展开更多
关键词 Co-rotational approach four-node quadrilateral shell element energy-momentum conservative algorithm multibody dynamics
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A Simple Framework of Conservative Algorithms for the Coupled Nonlinear Schrdinger Equations with Multiply Components 认领 引用 被引量：1
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作者 钱旭 宋松和 李伟斌 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第6期703-709,共7页
Considering the coupled nonlinear Schr¨odinger system with multiply components, we provide a novel framework for constructing energy-preserving algorithms. In detail, based on the high order compact finite differ... Considering the coupled nonlinear Schr¨odinger system with multiply components, we provide a novel framework for constructing energy-preserving algorithms. In detail, based on the high order compact finite difference method, Fourier pseudospectral method and wavelet collocation method for spatial discretizations, a series of high accurate conservative algorithms are presented. The proposed algorithms can preserve the corresponding discrete charge and energy conservation laws exactly, which would guarantee their numerical stabilities during long time computations.Furthermore, several analogous multi-symplectic algorithms are constructed as comparison. Numerical experiments for the unstable plane waves will show the advantages of the proposed algorithms over long time and verify the theoretical analysis. 展开更多
关键词 conservative algorithm coupled nonlinear SchrSdinger equation multiply components unstablewave
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Occlusion Culling Algorithm Using Prefetching and Adaptive Level of Detail Technique 认领 引用
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作者 郑福仁 战守义 杨兵 《Journal of Beijing Institute of Technology》 EI CAS 2006年第4期425-430,共6页
A novel approach that integrates occlusion culling within the view-dependent rendering framework is proposed. The algorithm uses the prioritized-layered projection（PLP） algorithm to occlude those obscured objects, a... A novel approach that integrates occlusion culling within the view-dependent rendering framework is proposed. The algorithm uses the prioritized-layered projection（PLP） algorithm to occlude those obscured objects, and uses an approximate visibility technique to accurately and efficiently determine which objects will be visible in the coming future and prefetch those objects from disk before they are rendered, view-dependent rendering technique provides the ability to change level of detail over the surface seamlessly and smoothly in real-time according to cell solidity value. 展开更多
关键词 occlusion culling prefetching adaptive level of detail（LOD） approximate algorithm conservative algorithm
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A Conservative Multiversion Locking-Graph Scheduler Algorithm 认领 引用
4
作者 陈昉 施伯乐 《Journal of Computer Science & Technology》 SCIE EI 1991年第2期161-166,共6页
In order to improve the concurrency of multiversion database systems,a conservative MV locking-graph scheduler algorithm is proposed,which takes the power of MVS as a target.The algorithm combines the advantages of lo... In order to improve the concurrency of multiversion database systems,a conservative MV locking-graph scheduler algorithm is proposed,which takes the power of MVS as a target.The algorithm combines the advantages of locking and graph,and does optimizing processes on read-only and write-only operations to reduce the blocks of transactions.The correctness and com- plexity of the algorithm are also provided. 展开更多
关键词 node cycle SG A Conservative Multiversion Locking-Graph Scheduler Algorithm
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Energy conserving and decaying algorithms for corotational finite element nonlinear dynamic responses of thin shells 认领 引用 被引量：2
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作者 YANG JinSong XIA PinQi 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第12期3311-3321,共11页
On the basis of the finite element corotational formulation for geometric nonlinear static analysis of thin shells with large rota- tion and small strain established before and from the generalized-a time integration ... On the basis of the finite element corotational formulation for geometric nonlinear static analysis of thin shells with large rota- tion and small strain established before and from the generalized-a time integration algorithm, the energy conserving and de- caying algorithms for corotational formulation nonlinear dynamic response analysis of thin shells are established in this paper. Responses are solved by means of a predictor-corrector procedure. In the case of ignoring the structural damping, the conserv- ing or decaying total energy of structure and the controllable numerical damping for high frequency responses can ensure the numerical stability of the algorithm. The inertial parts are linearly interpolated directly in the fixed global coordinate system by using the element nodal displacement in the global coordinate system for obtaining the constant mass matrix, while the elastic parts adopt the corotational formulation. Hence, the whole formulation obtained in this paper is element independent. Through three typical numerical examples, the performances of the algorithm in this paper were compared with those of the classical Newmak and HHT-a algorithms to indicate that the algorithm in this paper could accurately solve nonlinear dynamic respons- es of thin shells with large displacements and large rotations. 展开更多
关键词 thin shell nonlinear dynamics corotational formulation finite elements energy conserving and decaying algorithms
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A sharp-interface immersed smoothed point interpolation method with improved mass conservation for fluid-structure interaction problems 认领 引用 被引量：3
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作者 Bo-qian Yan Shuangqiang Wang +3 位作者 Gui-yong Zhang Chen Jiang Qi-hang Xiao Zhe Sun 《Journal of Hydrodynamics》 SCIE EI CSCD 2020年第2期267-285,共19页
To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-P... To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-PIM combining mass conservation algorithm,called Sharp-ISPIM-Mass,is proposed in this work.Based on the so called sharp-interface method,the technique of quadratic local velocity reconstruction has been developed by combining with the mass conservation algorithm,which enables the present method improve the accuracy of the velocity field and satisfy the mass conservation condition near the boundary field.So the proposed method would not encounter the problem of spurious mass flux.In addition,a new form of FSI force evaluation considering pressure and viscous force to perform a whole function from the fluid domain to fictitious fluid domain is introduced,which makes the present method obtain more accurate results of FSI force than the original one.Through the numerical studies of a number of benchmark examples,the performance of the Sharp-ISPIM-Mass has been examined and illustrated. 展开更多
关键词 Sharp-interface technique immersed type method mass conservation algorithm fluid-structure interaction(FSI)
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