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2014 International Conference on Experimental and Applied Mechanics(EAM 2014)

作者： Yingjie Duan Ling Chen Tao Xiong Xinghua Niu Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems School of Mechanical Engineering Tianjin University of Technology

To compare the strain and stress distribution on jaw bone around the implant with different crown-root and different teeth high in teeth repairing, three-dimensional geometric model of the implant was created and analyzed through UG and finite element analysis *** came to workbench software after it was drawn and assembly by 3D mapping software of *** material properties of the model, meshing, boundary conditions and forces applied for *** was Obtained that the size and distribution of stress and strain about jaw bone and implant under different *** influence of jaw bone and implant in different conditions was *** main results of the study are as follows: different implant and crown-root, maximum stress with the crown-root increases, but the maximum stress is *** in the high thread where the maximum stress with high thread show an inverted "U" shape, the maximum strain with high thread becomes flat.

关键词： Crown-root ratio High thread Three-dimensional finite element analysis

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Studying The Effects Of Different Materials And Thickness Of Titanium Layer To Implant Based On The Finite Element Method

Studying The Effects Of Different Materials And Thickness Of...

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2014 International Conference on Experimental and Applied Mechanics(EAM 2014)

作者： Yanqing Ma Ling Chen Shaokai Wang Xinghua Niu Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems School of Mechanical Engineering Tianjin University of Technology

Implant young's modulus has a decisive role on bone interface stress distribution and *** this paper, using UG software, change the traditional titanium implants into a new implant by the different thickness of the titanium layer wrapped in a variety of materials, and using ansys workbench changes thickness and Young's modulus of the core material, analysis of various the case of force and deformation of the implant, looking for a good biomechanics is both compatible with good mechanical properties and implant *** analysis, the ratio of all the results obtained: titanium layer thickness and Young's modulus of the core material has an impact on force and deformation.

关键词： Implant Finite element Young's modulus Titanium layer thickness

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A novel algorithm of space vector pulse width without sector calculation

A novel algorithm of space vector pulse width without sector...

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IEEE International Conference on Mechatronics and Automation

作者： Chunjie Wang Yongxin Tian Le Ge Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology 391 Tianjin China

ISBN: (纸本)9781479939800

Motor drive technology is the key to the development of electric vehicles, Voltage space vector pulse width modulation (SVPWM) method has been widely used due to its characteristics of convenient implementation and easy manipulation. Traditional space vector pulse width modulation (SVPWM) must calculation the sector, then deal with the complex calculations about the trigonometric function and irrational number, so the real-time control precision has been affected seriously. In this paper, through the thoroughly analyze of the principle of Voltage space vector pulse width modulation (SVPWM), a novel algorithm without sector calculation based on three vector synthesis has been proposed. By the synthesis of the two-axis components of the space vector in the two-phase stationary coordinate, it eliminates the sector and trigonometric calculations, makes the digital implementation easer and improves the accuracy of real-time control. The simulation shows the validity and feasibility of the algorithm.

关键词： Conferences Mechatronics Automation

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Hopf bifurcation analysis on dynamic voltage stability of wind power systems with SVC

Hopf bifurcation analysis on dynamic voltage stability of wi...

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IEEE International Conference on Mechatronics and Automation

作者： Ji Li Xuesong Zhou Guoling Dong Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Systems Nankai District Tianjin China

ISBN: (纸本)9781479939800

Hopf bifurcation frequently leads to periodic oscillations and even instability in nonlinear power systems. For Hopf bifurcation at equilibrium point in wind power systems, From the view of the structural stability, the static var compensator control effect on the Hopf bifurcation is analyzed, By tracking Hopf bifurcation point and two-parameter Hopf bifurcation boundary, The influence of the reactive power parameters of wind farms and the static var compensator parameters on dynamic voltage stability is analyzed. The study shows that static var compensator improves bus voltage stability and strengthens the power system equilibrium point stability by adjusting the local system's structural parameters, which can delay the Hopf bifurcation and improve the dynamic voltage stability of the nonlinear power system, this result is available for reference to voltage stability control of wind power systems.

关键词： Conferences Mechatronics Automation

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A kinematic modeling of an amphibious spherical robot system

A kinematic modeling of an amphibious spherical robot system

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IEEE International Conference on Mechatronics and Automation

作者： Shuxiang Guo Yuehui Ji Lin Bi Xu Ma Yunliang Wang Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems and Biomedical Robot Laboratory Tianjin University of Technology Tianjin China

ISBN: (纸本)9781479939800

This paper presents a kinematic model of an amphibious spherical robot through the Denavit-Hartenberg parameters method which will allow us to describe the link to the next or the previous. Then it is going to allow us to precisely define the frames which are going to move with the links, but also allow us to connect with the base through the structure to the end-actuator. Based on the known position and orientation of the robot, a series of kinematics equations are deduced through homogeneous transformation matrix based on the kinematics model and the inverse kinematics and each joint angle can be obtained. The prototype of amphibious robot includes four water-jet propellers and eight servo motors, which can be capable of changing walking mode between water-jet system and quadruped walking system. The walking speed and direction of amphibious robot can be handled by controlling the PWM pulse duty ratio. At last, some gait experiments had been carried out on the flat floor. The results of experiments verified that the model can give important guidance to gait trajectory planning for amphibious spherical robot.

关键词： Legged locomotion Kinematics Robot kinematics Joints Educational institutions Equations

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The construction and analysis of the three-dimensional finite element model of dental implant and root bisection joint prosthesis

The construction and analysis of the three-dimensional finit...

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IEEE International Conference on Mechatronics and Automation

作者： Chen Ji Ling Chen Shaokai Wang Zhong Zhang Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems Tianjin University of Technology Tianjin PR China

ISBN: (纸本)9781479939800

Objective: The paper is to explore the construction of the joint prosthesis model of dental implant and root bisection and mechanical rules of the bone-implant interface of screw-type dental implant. Methods: The Mimics software is applied for loading the image scanned by CT and reverse engineering software for optimizing the model, and Pro/engineer UG software for constructing the three-dimensional model. The model contains all ceramic crown, periodontal ligament, post core, drill base, screw-type dental implant, half of the real teeth, root canal, spongy bone and bone cortex. All the three dimensional finite element models were analyzed using ANSYS Workbench software. Stress distribution on the teeth surface under vertical load (250 N) were calculated for the models. Results: The spongy bone of the dental implant and its stress distribution and deformation rule is obtained. The stress value at the root of the screw-type dental plant is maximum, which is 100.15Mpa; deformation occurs mainly on the real tooth body, the maximum of which is 0.022mm. Conclusions: Acting as the sensory receptor, the periodontal ligament limits the bite force of the joint implant. Thus from the perspective of mechanical engineering, we can conclude that the joint prosthesis of clinical dental implant and root bisection is an excellent repair method.

关键词： Implants Teeth Finite element analysis Dentistry Stress Solid modeling Load modeling

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Finite element analysis on the mechanical behavior of articular cartilage under rolling load

Finite element analysis on the mechanical behavior of articu...

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IEEE International Conference on Mechatronics and Automation

作者： Qiuyue Zhang Lilan Gao Pengpeng Xiao Chunqiu Zhang Jinduo Ye Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems Tianjin University of Technology Tianjin PR China

ISBN: (纸本)9781479939800

Objective: The normal displacement, pore pressure and strain of different layers for articular cartilage were obtained with different compressive strains and rolling rates by finite element simulation method. Methods: The fibril reinforced poroelastic model of cartilage was built by considering depth-dependent elastic modulus, initial void ratio, permeability of strain and collagen fiber. By utilizing ABAQUS software, the finite element analysis on mechanical behavior of articular cartilage under the condition of rolling load was conducted. Results: With time continues, the normal displacement of different layers for cartilage tends to increase firstly and then decrease under rolling load. The normal displacement of superficial layer is largest, middle layer is smaller and deep layer is smallest. The normal displacement of different layers increases with the increment of compressive strain, however the changing tendency is not obvious with different rolling rates. Strain of superficial is largest while it decreases gradually with depth increasing. The pore pressure of different layers for articular cartilage increases with the increment of compressive strain while the pore pressure decreases along cartilage depth from surface to deep layer. Conclusions: It is found that the normal displacement and strain vary with different layers for articular cartilage under rolling load. The change of normal displacement of different layers is different with compressive strain and rolling rates. The paper acquires the pore pressure changes, which is hard to obtain by the experiment. The study contributes to the evaluation on the mechanical properties of cartilage with more accuracy and is significant for articular cartilage disease treatment and cartilage defect repair.

关键词： Strain Load modeling Finite element analysis Analytical models Permeability Materials

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The study of calibration and epipolar rectification for spherical stereo vision system

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2015年 30卷 19-25页

作者： Long, Bangqiang Lu, Chunfang Feng, Weijia State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin300072 China Tianjin Polytechnic University Tianjin300387 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Industry Systems Tianjin University of Technology Tianjin300384 China College of Computer and Information Engineering Tianjin Normal University Tianjin300387 China

A parameter calibration and epipolar rectification method for Spherical Stereo Vision System (SSVS) built by double fish-eye lenses is investigated in this paper. The geometric system model is established, which indicated the interior and exterior parameters. After that, the calibration method is researched for the general mathematical model. The principle of epipolar geometry for Spherical Stereo Vision System is discussed in detail. The calibration results of interior and exterior parameters are used for utilizing the epipolar rectification. The experiments prove that the calibration results are accurate and the effects of epipolar rectification are satisfied. The SSVS built by double fisheye lenses can get larger stereo field than traditional stereo vision system which based on a pair of perspective projection images. ©, 2015, The editorial office of Transaction of China Electrotechnical Society. All right reserved.

关键词： Calibration

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Finite element analysis of femoral fracture system

Finite element analysis of femoral fracture system

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作者： Gao, Ya Lei Dong, Li Min Chen, Wei Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in complicated Systems Tianjin 300384 China Tianjin Just Huajian Medical Instrument Co. Ltd Tianjin 300384 China

ISBN: (纸本)9783038351214

Plates are most commonly used fixation devices on treatment of femoral fracture, Hwoever, due to the unique mechanical properties and the strong bearing capacity of the femur, the cases of plate broken are at the top of the body skeleton. With the femur's healing, the stress on the femur and plate is in the process of dynamic transfer. Therefor, healing factors of femur should be considered to more fully describe the stress conditions, on femoral fracture fixation study. This paper study on titanium plate fixation of femoral fracture, analyzed the stress of the femur and plate in different healing period of the femur under different loads. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Finite element analysis of distinguish between two bone materials in femoral fixation system

Finite element analysis of distinguish between two bone mate...

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2014 2nd International Forum on Mechanical and Material Engineering, IFMME 2014

作者： Dong, Li Min Gao, Ya Lei Chen, Wei Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Application in complicated Systems Tianjin 300384 China Tianjin Just Huajian Medical Instrument Co. Ltd Tianjin 300384 China

ISBN: (纸本)9783038350798

This paper deals with the difference of finite element analysis of results between distinguishing bone materials modeling and single bone material modeling. The computed tomography (CT) data was used to build the model that can distinguish cortical bone, cancellous bone of the femur model, together with the plates could be used to set up internal fixation system and do the finite element analysis. The results indicated that the distributions of stress and strain were basically the same, so were the location of the maximum stress and strain. While, except under the axial loads the value of maximum stress and the value of maximum strain showed significant differences. Finally, study reached the conclusion that under the axial loads there were no significant difference between the two methods, thus the single bone material model could be used for easier computing, while, under the other 4 consequences paper recommended distinguishing bone material method for more practical results. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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