The Experts below are selected from a list of 2163 Experts worldwide ranked by ideXlab platform
Mingxiang Ling - One of the best experts on this subject based on the ideXlab platform.
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enhanced mathematical modeling of the displacement Amplification Ratio for piezoelectric compliant mechanisms
Smart Materials and Structures, 2016Co-Authors: Mingxiang Ling, Minghua Zeng, Daniel J InmanAbstract:Piezo-actuated, flexure hinge-based compliant mechanisms have been frequently used in precision engineering in the last few decades. There have been a considerable number of publications on modeling the displacement Amplification behavior of rhombus-type and bridge-type compliant mechanisms. However, due to an unclear geometric approximation and mechanical assumption between these two flexures, it is very difficult to obtain an exact description of the kinematic performance using previous analytical models, especially when the designed angle of the compliant mechanisms is small. Therefore, enhanced theoretical models of the displacement Amplification Ratio for rhombus-type and bridge-type compliant mechanisms are proposed to improve the prediction accuracy based on the distinct force analysis between these two flexures. The energy conservation law and the elastic beam theory are employed for modeling with consideRation of the translational and rotational stiffness. Theoretical and finite elemental results show that the prediction errors of the displacement Amplification Ratio will be enlarged if the bridge-type flexure is simplified as a rhombic structure to perform mechanical modeling. More importantly, the proposed models exhibit better performance than the previous models, which is further verified by experiments.
Dawei Zhang - One of the best experts on this subject based on the ideXlab platform.
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A Parasitic Motionless Piezoelectric Actuated Microgripper for Micro/Nano Manipulation
2019 International Conference on Manipulation Automation and Robotics at Small Scales (MARSS), 2019Co-Authors: Bijan Shirinzadeh, Mohammadali Ghafarian, Ammar Al-jodah, Yanling Tian, Dawei ZhangAbstract:This paper presents an asymmetric design of piezoelectric actuated microgripper for micro-objects handling. The microgripper offers parasitic motionless linear motion of the gripper jaw. The design integrates a bridge-type mechanism and parallelogram mechanisms in such a way that a pure linear motion of the gripper jaw in the grasping direction can be achieved. The analytical modeling is developed to find the output displacement, the displacement Amplification Ratio, and the natural frequency of the mechanism. Finite element analysis (FEA) is conducted to verify the results obtained from analytical modeling. The FEA results show that a jaw displacement of 353 μm with a displacement Amplification Ratio of 17.65 can be achieved. The parasitic motion can be reduced to 0.012 % of the gripper jaw motion in the x-direction. The modal analysis shows that the first natural frequency of 207.81 Hz can be achieved. The minimum safety factor of the design is 6.06, which ensures the microgripper can perform a repeated task.
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Design of a novel parallel monolithic 3-DOF compliant micromanipulator
2019 International Conference on Manipulation Automation and Robotics at Small Scales (MARSS), 2019Co-Authors: Mohammadali Ghafarian, Bijan Shirinzadeh, Ammar Al-jodah, Yanling Tian, Dawei ZhangAbstract:A three degrees of freedom (DOF) monolithic compliant parallel micromanipulator is presented. The research aim is to design a monolithic mechanism with capability of working in three translational axes and having high resonant frequency. A finite element analysis (FEA) model is developed to perform analysis and predict the behaviour of the mechanism, and thus establish the computational Jacobian, workspace and Amplification Ratio. Finally, the stress-strain relationship of the mechanism is investigated by applying safety factor and the results are presented.
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Design and Control of a Compliant Microgripper With a Large Amplification Ratio for High-Speed Micro Manipulation
IEEE ASME Transactions on Mechatronics, 2016Co-Authors: Fujun Wang, Yanling Tian, Cunman Liang, Xingyu Zhao, Dawei ZhangAbstract:The design and control of a novel piezoelectric actuated compliant microgripper is studied in this paper to achieve fast, precise, and robust micro grasping opeRations. First, the microgripper mechanism was designed to get a large jaw motion stroke. A three-stage flexure-based Amplification composed of the homothetic bridge and leverage mechanisms was developed and the key structure parameters were optimized. The microgripper was manufactured using the wire electro discharge machining technique. Finite element analysis and experimental tests were carried out to examine the performance of the microgripper mechanism. The results show that the developed microgripper has a large Amplification factor of 22.6. Dynamic modeling was conducted using experimental system identification, and the displacement and force transfer functions were obtained. The position/force switching control strategy was utilized to realize both precision position tracking and force regulation. The controller composed of an incremental proportional-integral-derivative control and a discrete sliding mode control with exponential reaching law was designed based on the dynamic models. Experiments were performed to investigate the control performance during micro grasping process, and the results show that the developed compliant microgripper exhibits good performance, and fast and robust grasping opeRations can be realized using the developed microgripper and controller.
Daniel J Inman - One of the best experts on this subject based on the ideXlab platform.
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enhanced mathematical modeling of the displacement Amplification Ratio for piezoelectric compliant mechanisms
Smart Materials and Structures, 2016Co-Authors: Mingxiang Ling, Minghua Zeng, Daniel J InmanAbstract:Piezo-actuated, flexure hinge-based compliant mechanisms have been frequently used in precision engineering in the last few decades. There have been a considerable number of publications on modeling the displacement Amplification behavior of rhombus-type and bridge-type compliant mechanisms. However, due to an unclear geometric approximation and mechanical assumption between these two flexures, it is very difficult to obtain an exact description of the kinematic performance using previous analytical models, especially when the designed angle of the compliant mechanisms is small. Therefore, enhanced theoretical models of the displacement Amplification Ratio for rhombus-type and bridge-type compliant mechanisms are proposed to improve the prediction accuracy based on the distinct force analysis between these two flexures. The energy conservation law and the elastic beam theory are employed for modeling with consideRation of the translational and rotational stiffness. Theoretical and finite elemental results show that the prediction errors of the displacement Amplification Ratio will be enlarged if the bridge-type flexure is simplified as a rhombic structure to perform mechanical modeling. More importantly, the proposed models exhibit better performance than the previous models, which is further verified by experiments.
Fuliang Wang - One of the best experts on this subject based on the ideXlab platform.
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Modeling and Experimental Study of a Wire Clamp for Wire Bonding
Journal of Electronic Packaging, 2015Co-Authors: Fuliang WangAbstract:A wire clamp is used to grip a gold wire with in 1–2 ms during thermosonic wire bonding. Modern wire bonders require faster and larger opening wire clamps. In order to simplify the design process and find the key parameters affecting the opening of wire clamps, a model analysis based on energy conservation was developed. The relation between geometric parameters and the Amplification Ratio was obtained. A finite element (FE) model was also developed in order to calculate the Amplification Ratio and natural frequency. Experiments were carried out in order to confirm the results of these models. Model studies show that the arm length was the major factor affecting the opening of the wire clamp.
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Finite element analysis of wire clamp for wire bonding
2012 13th International Conference on Electronic Packaging Technology & High Density Packaging, 2012Co-Authors: Fuliang WangAbstract:Wire clamp is used in the wire bonding process to grip and release the gold wire for forming loop profile in 1-2 milliseconds. Large opening and high response frequency are the mainly two factors for wire clamp design. To research the feature of wire clamp, a finite-element model was developed to calculate the Amplification Ratio and nature frequency. Results show that piezoelectric actuated wire clamp has a high resonant frequency of over 1000 Hz and an opening of over 80 μm. The effect of geometry parameters on the Amplification Ratio was also studied based on the finite-element model, and length of arm was found as the major factor. This research is useful for wire clamp design and optimization.
Quan Zhang - One of the best experts on this subject based on the ideXlab platform.
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a novel Amplification Ratio model of a decoupled xy precision positioning stage combined with elastic beam theory and castigliano s second theorem considering the exact loading force
Mechanical Systems and Signal Processing, 2020Co-Authors: Quan Zhang, Jianguo Zhao, Yan Peng, Huayan Pu, Yi YangAbstract:Abstract A novel mathematical model which can precisely calculate the Amplification Ratio of a bridge-type Amplification mechanism has been proposed. The elastic beam theory and the Castigliano’s second theorem were utilized to establish the mathematical model with consideRation of the deformation of input beams, output beam, connecting beams and flexure hinges. The proposed model was compared with existing theoretical models and finite element model (FEM), and the results validated that the proposed model featured a better performances and was the most proximal model to the FEM analysis. With the interval of the adjacent flexible hinges changed, the error at the peak of Amplification Ratio with the FEM was limited to 6.76%, which was lower than most of the typical existing models. To further verify the effectiveness and expansibility of the proposed method, a decoupled XY precision positioning stage was investigated. Considering the influence of the loading force exerted on Amplification mechanism, the displacement Amplification Ratio model of the positioning stage was established, and the results were further proved through the finite element simulation. The experimental results presented that the Amplification Ratios for X-direction and Y-direction motions are 5.83 and 5.71, the measured workspace of the stage is 174.9 μm × 171.3 μm, and the cross-coupling error was evaluated to less than 3%.
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Design, Modeling, and Testing of a Novel XY Piezo-Actuated Compliant Micro-Positioning Stage
Micromachines, 2019Co-Authors: Quan Zhang, Jianguo Zhao, Xin Shen, Qing Xiao, Jun Huang, Yuan WangAbstract:A novel decoupled XY compliant micro-positioning stage, based on a bridge-type Amplification mechanism and parallelogram mechanisms, is designed in this paper. Analytical models of the bridge-type Amplification mechanism and parallelogram mechanisms are developed by Castigliano’s second theorem and a Beam constrained model. The Amplification Ratio, input stiffness, and output stiffness of the stage are further derived, based on the proposed model. In order to verify the theoretical analysis, the finite element method (FEM) is used for simulation and modal analysis, and the simulation results indicate that the errors of the Amplification Ratio, input stiffness, and output stiffness of the stage between the proposed model and the FEM results are 2.34%, 3.87%, and 2.66%, respectively. Modal analysis results show that the fundamental natural frequency is 44 Hz, and the maximum error between the theoretical model and the FEM is less than 4%, which further validates the proposed modeling method. Finally, the prototype is fabricated to test the Amplification Ratio, cross-coupling error, and workspace. The experimental results demonstrate that the stage has a relatively large workspace, of 346.1 μm × 357.2 μm, with corresponding Amplification Ratios of 5.39 in the X-axis and 5.51 in the Y-axis, while the cross-coupling error is less than 1.5%.
