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Amplification Ratio

The Experts below are selected from a list of 2163 Experts worldwide ranked by ideXlab platform

Mingxiang Ling – 1st expert on this subject based on the ideXlab platform

  • enhanced mathematical modeling of the displacement Amplification Ratio for piezoelectric compliant mechanisms
    Smart Materials and Structures, 2016
    Co-Authors: Mingxiang Ling, Minghua Zeng, Daniel J Inman

    Abstract:

    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 – 2nd expert on this subject based on the ideXlab platform

  • A Parasitic Motionless Piezoelectric Actuated Microgripper for Micro/Nano Manipulation
    2019 International Conference on Manipulation Automation and Robotics at Small Scales (MARSS), 2019
    Co-Authors: Bijan Shirinzadeh, Mohammadali Ghafarian, Ammar Al-jodah, Yanling Tian, Dawei Zhang

    Abstract:

    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.

  • Design of a novel parallel monolithic 3-DOF compliant micromanipulator
    2019 International Conference on Manipulation Automation and Robotics at Small Scales (MARSS), 2019
    Co-Authors: Mohammadali Ghafarian, Bijan Shirinzadeh, Ammar Al-jodah, Yanling Tian, Dawei Zhang

    Abstract:

    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.

  • Design and Control of a Compliant Microgripper With a Large Amplification Ratio for High-Speed Micro Manipulation
    IEEE ASME Transactions on Mechatronics, 2016
    Co-Authors: Fujun Wang, Yanling Tian, Cunman Liang, Xingyu Zhao, Dawei Zhang

    Abstract:

    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 – 3rd expert on this subject based on the ideXlab platform

  • enhanced mathematical modeling of the displacement Amplification Ratio for piezoelectric compliant mechanisms
    Smart Materials and Structures, 2016
    Co-Authors: Mingxiang Ling, Minghua Zeng, Daniel J Inman

    Abstract:

    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.