Journal of Computational and Nonlinear Dynamics

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Dynamics of a Deployable Mesh Reflector of Satellite Antenna: Form-Finding and Modal Analysis
Journal of Computational and Nonlinear Dynamics - Tập 11 Số 4 - 2016
Pei Li, Cheng Liu, Qiang Tian, Haiyan Hu, Yanping Song
Mesh reflectors with large apertures have been used in many communication satellites. The performance of antenna reflectors crucially depends on the faceting error of the reflective surface, which is approximated by using meshes. The force density method (FDM) has been widely used for the form-finding analysis of mesh reflectors. However, after performing form-finding of some meshes, the e...... hiện toàn bộ
Practical Tuning Rule Development for Fractional Order Proportional and Integral Controllers
Journal of Computational and Nonlinear Dynamics - Tập 3 Số 2 - 2008
YangQuan Chen, Tripti Bhaskaran, Dingyü Xue
This paper presents a new practical tuning method for fractional order proportional and integral (FO-PI) controller. The plant to be controlled is mainly first order plus delay time (FOPDT). The tuning is optimum in the sense that the load disturbance rejection is optimized yet with a constraint on the maximum or peak sensitivity. We generalized Ms constrained integral (MIGO) based control...... hiện toàn bộ
Direct and Adjoint Sensitivity Analysis of Ordinary Differential Equation Multibody Formulations
Journal of Computational and Nonlinear Dynamics - Tập 10 Số 1 - 2015
Daniel Dopico, Yitao Zhu, Adrian Sandu, Corina Sandu
Sensitivity analysis of multibody systems is essential for several applications, such as dynamics-based design optimization. Dynamic sensitivities, when needed, are often calculated by means of finite differences. This procedure is computationally expensive when the number of parameters is large, and numerical errors can severely limit its accuracy. This paper explores several analytical a...... hiện toàn bộ
The Adjoint Method for Time-Optimal Control Problems
Journal of Computational and Nonlinear Dynamics - Tập 16 Số 2 - 2021
Philipp Eichmeir, Thomas Lauß, Stefan Oberpeilsteiner, Karin Nachbagauer, Wolfgang Steiner
Abstract In this article, we discuss a special class of time-optimal control problems for dynamic systems, where the final state of a system lies on a hyper-surface. In time domain, this endpoint constraint may be given by a scalar equation, which we call transversality condition. It is well known that such problems can be transformed to a two-point ...... hiện toàn bộ
Integration of Large Deformation Finite Element and Multibody System Algorithms
Journal of Computational and Nonlinear Dynamics - Tập 2 Số 4 - Trang 351-359 - 2007
Ahmed A. Shabana, Olivier A. Bauchau, Gregory M. Hulbert
This paper presents an overview of research and development efforts that are currently being devoted to integrate large deformation finite element formulations with flexible multibody system algorithms. The goal is to develop computer simulation capabilities for the analysis of physics and engineering models with significant details. The successful development of such new and integrated al...... hiện toàn bộ
On the Projection of a Flexible Bodies Modal Coordinates Onto Another Finite Element Model With Local Modifications
Journal of Computational and Nonlinear Dynamics - Tập 14 Số 7 - 2019
Wolfgang Witteveen, Stefan Pöchacker, Florian Pichler
The time integration of a complex multibody system is a time consuming part of the entire evaluation process of a flexible component. A multibody simulation of a flexible crankshaft, for instance, interacting with pistons, con rods, fly wheel, hydrodynamic bearings and further takes several hours of central processing unit (CPU) time and may dominate the entire simulation chain. Small, loc...... hiện toàn bộ
Dynamics of Multibody Systems With Spherical Clearance Joints
Journal of Computational and Nonlinear Dynamics - Tập 1 Số 3 - Trang 240-247 - 2006
Paulo Flores, Jorge Ambrósio, José Carlos Pimenta Claro, Hamid M. Lankarani
This work deals with a methodology to assess the influence of the spherical clearance joints in spatial multibody systems. The methodology is based on the Cartesian coordinates, with the dynamics of the joint elements modeled as impacting bodies and controlled by contact forces. The impacts and contacts are described by a continuous contact force model that accounts for geometric and mecha...... hiện toàn bộ
Normal Force-Displacement Relationship of Spherical Joints With Clearances
Journal of Computational and Nonlinear Dynamics - Tập 1 Số 2 - Trang 160-167 - 2006
Caishan Liu, Ke Zhang, Lei Yang
The spherical joint with clearances can be modeled as an axi-symmetric quasi-static contact of a sphere in a cavity. The Hertz theory based on the assumption of nonconformal contact is often used to represent the normal force-displacement relationship for the spherical joint with clearances. This assumption limits the application of the theory, especially in the case of occurring large def...... hiện toàn bộ
Translational Joints With Clearance in Rigid Multibody Systems
Journal of Computational and Nonlinear Dynamics - Tập 3 Số 1 - 2008
Paulo Flores, Jorge Ambrósio, José Carlos Pimenta Claro, Hamid M. Lankarani
A computational methodology for dynamic description of rigid multibody systems with translational clearance joints is presented and discussed in this work. Over the past years, extensive work has been done to study the dynamic effect of the revolute joints with clearance in multibody systems, in contrast with the little work devoted to model translational joints with clearance. In a joint ...... hiện toàn bộ
Development and Validation of Geometry-Based Compliant Contact Models
Journal of Computational and Nonlinear Dynamics - Tập 6 Số 1 - 2011
Lianzhen Luo, Meyer Nahon
Simulations are often used to evaluate space manipulator tasks that involve contact with the environment, due to the difficulty of performing realistic earth-based experiments. An important aspect of these simulations is the contact model used to determine the interbody forces between two objects in contact. In this paper, we present two compliant contact models for polyhedral contacting o...... hiện toàn bộ
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