Papers by Keyword: Rigidity

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Authors: Zeng Ming Li, Bin Bin Peng, Bao Gang Yang, Hao Yuan Chen
Abstract: In the paper, a novel 2-DOF (degree of freedom) plane translational parallel manipulator with passive universal joints and three legs is presented. Firstly, the 2-DOF translational parallel manipulator which has the spatial structure and high bearing capacity in the direction perpendicular to the kinematics plane is described. Then, the kinematics analysis of the 2-DOF parallel manipulator, which include inverse and forward solutions, are studied in detail, and the Jacobian matrix of the parallel manipulator is also derived based on it. Lastly, to improve the stability and bearing capacity further, the symmetric mechanisms with four legs and passive universal joints are constructed by adding a leg in parallel. The proposed 2-DOF parallel manipulator not only has the simple structure, but high stiffness especially in the direction perpendicular to kinematics plane for its spatial arrangment and passive universal joints.
Authors: Chang Li, Xiao Gang Ma, Xing Han, Guang Bing Zhao
Abstract: Created in ADAMS/View virtual environment, it combines the complementary advantages of the ADAMS secondary development programming technology APDL and VC++6.0 to build a rigidity and flexibility coupled parameterized dynamic simulation model of the PUMA560 robot, while through the self defining function of constraints and loads, it realizes the model drive loading . After multiple dynamic simulations, normal solutions and inverse solutions of the PUMA560 robot are obtained, and this can provide a foundation for the research on the operability and space locus of the PUMA560 robot. Meanwhile, this new method is also true for other similar kind of rigidity and flexibility coupled mechanics dynamic simulation and a reliable pathway for the analysis of mechanic random errors effect on its motion as well. The excellent feature of this new method is that it will considerate sufficiently the effects of key part’s elastic deformation on the entire mechanic motion, while it needs not to create complex analogue to solve the mechanic, rapidly, conveniently and with high accuracy, which has good theoretical meaning and application value.
Authors: Xiang Yang Jin, Xiang Yi Guan, Li Li Zhao, He Teng Wang, Zhi Hui Sun
Abstract: Analyze the dynamic characteristics of long tooth height gear transmission system by using transfer-matrix method. Firstly, set up a calculation model of level 2 transmission system for long tooth height gear and master gear and construct the transfer equation and transfer matrix of all components, then calculate the rigidity and rotational inertia of the system and know the natural frequency and dominant mode of the whole system through the computer, at last, analyze and compare two systems and prove the superiority of long tooth height gear for reducing vibration and lowering noise.
Authors: Ani Luo, Zhou Kun, Jian Hua Song, He Ping Liu, Te Xiao, Ling Ying Kong
Abstract: The truss structure has characteristics of small mass with high rigidity etc., so it is still practical in structures and researched by engineers and scientists. Here a truss structure with the paraboloid top surface is presented; several truss forms of the octahedral space units are connected into it. The equilibrium matrix is calculated by the force-density method. From the equilibrium matrix, number of the self-stress mode and number of the displacement mode of the structure is calculated. According to the obtained result, the structure is proved to be in equilibrium. Through the ANSYS software, the truss structure is researched for deformation under outer forces and it is proved that the structure has certain rigidity and withholding capacity.
Authors: Ji Hong Jiang, Zhong Xu, Kai Li, Xing Zhu Wang
Abstract: This paper takes the engineering project of push-pull type hangar door as an example, applying the large-scale general-purpose program STS in PKPM software to build a spatial model, PMSAP program to analyze the rods with finite element, and STS program to design connection of nods and post-processing of construction drawings. It puts forward an effective solution when designing similar steel door and special steel structure and provides guidance for practical engineering design.
Authors: Jian Jun Ye, Xun An Zhang, Xian Jie Wang
Abstract: The randomness of value of tuned sub-structure mass and rigidity is comparatively large because of the needs of actual projects. Based on the dynamic characteristics and reliability of MSCS, the seismic response of the mega structure and the overall failure probability are discussed with the value of tuned sub structural mass and rigidity under different seismic intensity. It is shown that tuned sub structural mass and rigidity have significant affection on the overall reliability of structure, and seismic intensity has not interfere this regular pattern. Therefore, structural parameters of optimization which are referred to the regular pattern should be considered in the actual design in order to further enhance seismic capability of MSCS.
Authors: Hai Jun Qu, Gui Cheng Wang, Yun Ming Zhu, X.D. Zhu
Abstract: A finite element model was developed for simulation of feed direction burr formation process in turning. Based on a series of stress and strain contours the progressive change of geometry at the edge of workpiece edge from simulation, a turning feed direction burr formation mechanism is proposed and divided into four stages: normal cutting stage, deformation of workpiece edge stage, continues cutting stage and final developed stage. The removal of the remaining part of allowance takes place close to the tool tip as the material has sufficient rigidity to allow cutting only in this area in final developed stage and secondary burr will be formed; primary burr will be formed in final developed stage if the remaining material has no rigidity to allow cutting continually in final developed stage. The burr size and burr shapes form simulation results are consistent with the experimental results. Finite element model generated here provided a numerical analysis method to solve the prediction of burr formation and physical insight into the fundamental burr formation mechanism.
Authors: Wei Feng Wang, Jun Tao Yuan, An Lin Zhang, Meng Li
Abstract: For present-day bridges.cable tensions test is a vitally important job in course of construction.The tensions condition of cables plays an especially important part in the course of construnction and operation.In order to ensure the safety of operation and lengthen the service life,the exact testing result is being required to obtain.In cable stayed bridges and arch bridges, the boundary condition as well as the bending rigidity has an greater effect on the cable forces testing of the short boom.This paper based on Additional Mass Method,using the method of GA-BP Neural network after Genetic Algorithm optimization to identify the cable forces of short boom and a preferable research result is obtained.
Authors: Ji Hoon Kim, Joo Yeung Jeong, Jung Min Bang, Jung Ho Kim, In Young Yang
Abstract: Carbon fiber reinforced plastics (CFRP) have high strength in comparison with dimensional stability, invariability of material property, high strength and rigidity, corrosion resistance. Therefore, CFRP is widely used in various fields including space and aviation industries, sports and leisure industries, and general structural members and parts. To achieve structural members of CFRP with high strength and rigidity, theoretical approaches is limited to isotropic material, and empirical studies have been conducted. As with other composite materials, CFRP shows different rigidity and strength due to difference in properties in fiber and matrix material. In this study, CFRP specimen with changing stack orientation angle was manufactured as general structural application, and bending strength and rigidity of the corresponding composite was measured. In addition, square aluminium tube reinforcement is applied to prevent the shortcoming of CFRP. Vacuum compressed CFRP via autoclave with square aluminium tube reinforcement material (Hybrid) was evaluated by changing of orientation angle.
Authors: Mohd Azrul Hisham Mohd Adib, Nur Hazreen Mohd Hasni
Abstract: The objectives of this study are to observe the deformation of mitral leaflet in systole condition and compare the rigidity of heart valve leaflet during systole and diastole conditions. Two-dimensional model of the mitral valve leaflet with ventricle were created using fluid structure interaction model in computational simulations. The result shows rigidity of heart valve leaflet always opposite to degeneration and the simulated displacement models corresponded to normal deformation in physical heart valve in systole condition. Modeling simulation techniques are very useful in the study of degenerative heart valve and the findings would allow us to optimize feature and geometries to reduced deformation of heart valve failure.
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