Papers by Author: Jing Zhong Xing

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Authors: Xiao Xia Chen, Shu Zhong Lin, Jing Zhong Xing
Abstract: Method to investigate the elastic deformation of a flexspline in harmonic driver was developed under assembly force from wave generator and transmission force. Shell element and tapered beam element were applied to model the flexspline cone and the teeth on the flexspline respectively. Forced displacement of the flexspline in assembly state was imposed by contact analysis between the flexspline and wave generator. According to experimental distribution of tangential forces in transmission state, applying forces at the teeth tips on the flexspline in mesh state, deformation distribution under transmission torque loading was obtained. Simulations of assembly state and transmission state were realized in ANSYS software. In three sections of tooth ring vertical to the axis, the deformation distributions of the flexspline under specified displacement in assembly state were compared with the theory results. Deformation between tip of tooth and neutral layer in assembly state and in transmission state were compared respectively. The deformation results agreed well with the theory results in assembly state, while difference was found in tangential displacement on tooth tips in transmission state, which may influence mesh property evidently under transmission loading.
Authors: Xiao Xia Chen, Shu Zhong Lin, Jing Zhong Xing, Yu Sheng Liu
Abstract: The displacement of tooth and the deformation of flexspline of harmonic drive in transmission state were studied by finite element model with shell element. A finite element model of flexspline based on shell element was built with taper teeth on the flexspline, and the contact relationship was defined by contact element between the flexspline and wave generator. The deformation distribution of the flexspline and the deformed position of the teeth on the flexspline were obtained by nonlinear contact analysis in ANSYS environment under the transmission forces according to the loading distribution in the reference. The position of teeth tip and teeth root in front, middle and back plane along teeth length were given by the deformation results. The research shows that the positions and orientations of the teeth in the planes have quite different distributions, which may influence mesh property evidently. The deformation in transmission state in the paper is of importance in heavy loading harmonic drive design because there is no theory results for flexspline in transmission state.
Authors: Xiao Xia Chen, Shu Zhong Lin, Jing Zhong Xing
Abstract: Harmonic drive has widespread applications for its compact size and high reduction ratios. It is often favored for electro-mechanical systems with space and weight limitation. In order to minimize the volume and improve its transmission capacity, more and more aborative design technologies are adopted. For structural analyses in assembly state and in transmission stage, Finite Element Analysis (FEA) can be widely applied to get proper parameters and performance. Flexspline usually endures large deformation under assembly force from wave generator. In transmission state, driving force leads to multiple tooth mesh contact between flexspline and circular spline teeth. In this paper, shell element is applied to build flexspline cone, and tapered beam element is used to model the teeth on the flexspline. Contact relation between flexspline and wave generator is simulated by contact element. Forced displacement of flexspline is imposed by contact analysis. Transmission forces are acted at the teeth tips on the flexspline in mesh state, whose values are determined according to experimental distribution. Simulations of assembly state and transmission state are computed in ANSYS. Deformation and stress distribution in assembly state are compared with that in transmission state. Some suggestions for long life and high performance design are present.
Authors: Jing Zhong Xing, Li Chen, Jin Chao Li
Abstract: Advanced composite materials generally use fiber in very high volume fraction, compression of textile/perform is adopted in manufacture processes. The major role of the compaction process is to obtain high fiber volume fraction in final parts. During the compaction process, transverse compaction of textile/perform is the main deformation form, where the compaction behavior of a fiber bundle is the most basis issue. In this paper, a micromechanical model of aligned fiber bundle with high fiber volume fraction was developed to investigate elastic deformation behavior under bulk compressive pressure and longitudinal stress. Bending characteristics of a waved fiber was established to describe the transverse bulk compression and the longitudinal deformations of a bundle. A wave amplitude was introduced to describe initial distance between fibers, which affects the initial fiber volume fraction and the transverse deformation feature. An improved representative fiber cell was present to get the deflection of a bending fiber under transverse and axial force. Randomly distributed directions of waved fibers lead to a more reasonable representative fiber cell, which influences initial fiber volume fraction and leads to logical deformation explanation and symmetric constitutive relation for aligned fiber bundle with high volume fraction. Analytical formulae to describe the constitutive relationship of fiber bundle under transverse and longitudinal stress were present. Numerical results show that the transverse bulk compressive stress and its deformation are related to wave amplitude and available fiber volume fraction. The comparison to present literatures was given to show the improvement of the model.
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