Papers by Keyword: Flexible Cable

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Authors: Ji Won Yoon, Kab Jin Jun, Tae Won Park
Abstract: Recently, the finite element absolute nodal coordinate formulation(ANCF) was developed for large deformation analysis of flexible bodies in multi-body dynamics. This formulation is based on finite element procedures and the general continuum mechanics theory to represent elastic forces. In this paper, a computational method, which predicts the dynamic and structural properties of a very flexible beam in a multibody system, is presented based on Euler-Bernoulli beam theory and ANCF. In order to consider the dynamic interaction between a continuous large deformable beam and a rigid multibody system, a combined system equations of motion was derived by adopting absolute nodal coordinates and rigid body coordinates. The efficiency and reliability of the computational results are verified by comparison with a commercial program. These methods can be applied for predicting the dynamic stress and fatigue life of the wire harness used in a robot system. The process of predicting the fatigue life using the proposed method in this paper may be applied to continuous mechanical parts of various dynamic systems.
Authors: Wen Zheng Du, Zheng Xie
Abstract: This paper introduces a novel mathematical model that using the Hamiltons' principle to set up coupled dynamics model of gantry cranes with flexible cable. By using finite element method to solve the equations that govern the motion of the crane system. Numerical simulations for the coupled dynamics model are presented for various operating conditions, and compared to the simulation results of the model with cranes made with rigid cable under the same working conditions. From the consequence, we can get the effects of cable's flexibility on gantry crane's kinematical properties; According to the conclusions, this paper defines two parameters of the gantry cranes, and qualitatively analyzes the two parameters' effects on dynamics kinematical properties of gantry cranes.
Authors: Yue Zhang, Cheng Wei, Jiang Zhang, Yang Zhao
Abstract: The wire rope of drilling device is modeled by using absolute nodal coordinate formulation (ANCF) which is presented for the analysis of three dimensional flexible cable in this paper. This formulation is suited for the analysis of large rotation and deformation problem. Only axial and bending deformations are taken into account in this paper, which increases the computational efficiency without affecting the precision. Vibrations of the drilling mechanism and the wire rope under different preloads are simulated. It can be seen from the emulational results that resonance will occur when the preload increases to a certain value and the amplitude is the largest in this case.
Authors: Li Hua Zou, Kai Huang, Wei Zhang, Yu Rao, Li Yuan Wang
Abstract: A new seismic isolation system,namely the prestress rubber isolator(PRI,Chinese patent application number:200910174415x),is introduced.The basic principle of this new isolator is: making all or part of vertical deformation of isolator be finished in advance by exerting a longitudinal pre-compressional stress on the rubber isolator with flexible cables, the prestress tension cables become loose because of unloading after the exerting of superstructure loads,and the loose cables can limit the horizontal displacement and resist the tension of isolator. The calculation formula of horizontal stiffness of isolator is derivated,and the mechanical properties are researched. The research results show that:besides the horizontal isolating property of common rubber isolators,the prestress rubber isolator has also properties of reducing vertical deformation, limiting horizontal displacement and resisting tension.Moreover,the prestress isolator has also a certain vertical isolating affect because of the improve of rubber thickness.
Authors: Jian Ming Shi, Dong Zhou, Jie Geng, Chuan Lv
Abstract: Digital design and assembly of cables is a most important and difficult problem in mechanical industry. The paper solved the problem through the CAD/CAE software. Firstly, 3-D model of electrical bundle was built in the digital mock-up. The model reflected the parameters of the bundle exactly. After the design of cables, the simulation of cable moving was developed. The flexible feature of cable was displayed in the animation. It was an exciting achievement of this article, which can be used in the virtual assembly of cables to detect design problems. Besides the maintenance process containing cable plug and pull was simulated. The ergonomics was then tested in the form of virtual maintenance.
Authors: Wei Cai Quan, Zhu Ying Zhang, Ai Qun Zhang, Qi Feng Zhang
Abstract: We present an idea for modeling flexible ocean umbilical cable using a nonlinear finite element method. The umbilical cable is assembled by Reissners geometrically exact beam elements, which take account of the geometric nonlinearities of large rotation and displacement, and effects of axial load and bending stiffness for modeling of slack cables. The linearization and discretization of the entire weak form for the umbilical cable system are proposed. The resulting semi-discrete motion equations are solved by the Newmark method. The capability of considering the action of horizontal ocean current is a key feature of this analysis. An example about the two-dimensional dynamic behavior of the umbilical cable system in depth-dependent ocean current with sinusoidal ship motion is presented.
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