The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Minghui Zhang - One of the best experts on this subject based on the ideXlab platform.

  • a multi degree of freedom ultrasonic motor using in Plane Deformation of planar piezoelectric elements
    Sensors and Actuators A-physical, 2008
    Co-Authors: Minghui Zhang
    Abstract:

    A novel multi-degree-of-freedom (MDOF) ultrasonic motor was presented in this paper. The in-Plane Deformation of planar piezoelectric elements was used to generate the vibrations in the single stator. The working principle was elaborated; an initial prototype was fabricated and tested. The elliptical motion at the tip of the stator was demonstrated by measuring the vibration characteristics. And the load characteristic of the motor was also obtained. The results confirm that the motor successfully provides the desired MDOF motion around orthogonal axes with a single stator using in-Plane Deformation of planar piezoelectric elements.

  • P5G-6 A Multi-DOF Ultrasonic Motor Using In-Plane Deformation of PZT Elements
    2007 IEEE Ultrasonics Symposium Proceedings, 2007
    Co-Authors: Minghui Zhang, Mantian Li
    Abstract:

    A new multi degree-of-freedom (multi-DOF) ultrasonic motor using in-Plane Deformation of PZT elements is proposed in this paper. The stator of the motor consists of a hollow metal cylinder, whose outside surfaces are flattened on four sides at 90 degrees to each other. Four rectangular PZT plates polarized in thickness direction are bonded on them. By using the Deformation of PZT plates in the Plane perpendicular to the direction of polarization, the rotation around z-axis is generated by combining both bending vibration modes; whereas the rotation around x- or y-axis is generated by combining the longitudinal vibration mode and one of the above bending vibration modes. The stator geometry is designed in detail using the finite element method, and a prototype of the multi-DOF ultrasonic motor is produced. Admittance of the stator and load characteristics of the motor has been measured, respectively. The results confirm that the motor successfully provides the desired multi-DOF motion around orthogonal axes with a single stator using in-Plane Deformation of PZT elements.

  • A Multi-DOF Ultrasonic Motor Using In-Plane Deformation of PZT Elements and Its Driving Circuit
    2007 International Conference on Mechatronics and Automation, 2007
    Co-Authors: Minghui Zhang, Mantian Li
    Abstract:

    Due to the increasing number of DOFs of systems and the reducing the volume and weight of the devices, multi-degrees-of-freedom (DOF) actuators have become more useful in the field of robotics. And the general features of ultrasonic motors are also suitable for constructing a direct-drive multi-DOF actuator. So, a new multi-DOF ultrasonic motor using in-Plane Deformation of PZT elements is introduced in this paper. Then its working principle and requirement for driving circuit are analyzed. At last, a driving circuit is proposed accordingly which generates sinusoidal actuating signals with a FPGA part (a Direct Digital Synthesizer (DDS) array is synthesized in it) and amplifies them with high voltage power operational amplifiers. It is characteristic of independent adjustment of amplitude and frequency for each output signal and independent adjustment phase between any two of output signals. The circuit meets the requirement of the motor.

Mantian Li - One of the best experts on this subject based on the ideXlab platform.

  • P5G-6 A Multi-DOF Ultrasonic Motor Using In-Plane Deformation of PZT Elements
    2007 IEEE Ultrasonics Symposium Proceedings, 2007
    Co-Authors: Minghui Zhang, Mantian Li
    Abstract:

    A new multi degree-of-freedom (multi-DOF) ultrasonic motor using in-Plane Deformation of PZT elements is proposed in this paper. The stator of the motor consists of a hollow metal cylinder, whose outside surfaces are flattened on four sides at 90 degrees to each other. Four rectangular PZT plates polarized in thickness direction are bonded on them. By using the Deformation of PZT plates in the Plane perpendicular to the direction of polarization, the rotation around z-axis is generated by combining both bending vibration modes; whereas the rotation around x- or y-axis is generated by combining the longitudinal vibration mode and one of the above bending vibration modes. The stator geometry is designed in detail using the finite element method, and a prototype of the multi-DOF ultrasonic motor is produced. Admittance of the stator and load characteristics of the motor has been measured, respectively. The results confirm that the motor successfully provides the desired multi-DOF motion around orthogonal axes with a single stator using in-Plane Deformation of PZT elements.

  • A Multi-DOF Ultrasonic Motor Using In-Plane Deformation of PZT Elements and Its Driving Circuit
    2007 International Conference on Mechatronics and Automation, 2007
    Co-Authors: Minghui Zhang, Mantian Li
    Abstract:

    Due to the increasing number of DOFs of systems and the reducing the volume and weight of the devices, multi-degrees-of-freedom (DOF) actuators have become more useful in the field of robotics. And the general features of ultrasonic motors are also suitable for constructing a direct-drive multi-DOF actuator. So, a new multi-DOF ultrasonic motor using in-Plane Deformation of PZT elements is introduced in this paper. Then its working principle and requirement for driving circuit are analyzed. At last, a driving circuit is proposed accordingly which generates sinusoidal actuating signals with a FPGA part (a Direct Digital Synthesizer (DDS) array is synthesized in it) and amplifies them with high voltage power operational amplifiers. It is characteristic of independent adjustment of amplitude and frequency for each output signal and independent adjustment phase between any two of output signals. The circuit meets the requirement of the motor.

Damien Texier - One of the best experts on this subject based on the ideXlab platform.

  • in Plane and out of Plane Deformation at the sub grain scale in polycrystalline materials assessed by confocal microscopy
    Acta Materialia, 2019
    Co-Authors: N. Vanderesse, J.-c. Stinville, T.m. Pollock, P. Bocher, Damien Texier
    Abstract:

    Abstract High-resolution digital image correlation (HR-DIC) techniques have become essential in material mechanics to assess strain measurements at the scale of the elementary mechanisms responsible of the Deformation in polycrystalline materials. The purpose of this study is to demonstrate the use of laser scanning confocal microscopy (LSCM) coupled with DIC techniques to deepen knowledge on the Deformation process of a polycrystalline nickel-based superalloy at room temperature. The LSCM technique is capable of detecting both in-Plane and out-of-Plane strain localization within slip bands at the sub-grain level. The LSCM observations are consistent with previous in-situ scanning electron microscopy (SEM) studies: The onset of crystal plasticity occurs primarily near Σ3 twin boundaries with macroscopic loading in the elastic domain (macroscopic stress as low as 80% of the 0.2% offset yield strength (Y.S.0.2%)). This intense irreversible strain localization occurs with either a high Schmid factor (μ > 0.43) or a significant elastic modulus difference between the pair of twins (ΔE > 100 GPa). In the plastic Deformation domain, transgranular slip activity following slip systems with the highest Schmid factor is mostly responsible for the Deformation at the grain level, thus leading to strain percolation. The simultaneous in-Plane and out-of-Plane Deformation assessment via the HR-LSCM-DIC technique was found to be essential for the identification of active slip systems. Finally, the HR-LSCM-DIC technique enabled the quantification of the glide amplitude involved in the three-dimensional shearing process at the grain level that solely in-Plane measurements cannot provide.

  • IN-Plane and out-of-Plane Deformation at the SUB-GRAIN scale in polycrystalline materials assessed by confocal microscopy
    Acta Materialia, 2019
    Co-Authors: N. Vanderesse, J.-c. Stinville, T.m. Pollock, P. Bocher, Damien Texier
    Abstract:

    High-resolution digital image correlation (HR-DIC) techniques have become essential in material mechanics to assess strain measurements at the scale of the elementary mechanisms responsible of the Deformation in polycrystalline materials. The purpose of this study is to demonstrate the use of laser scanning confocal microscopy (LSCM) coupled with DIC techniques to deepen knowledge on the Deformation process of polycrystalline nickel-based superalloy at room temperature. The LSCM technique is capable of detecting both in-Plane and out-of-Plane strain localization within slip bands at the sub-grain level. The LSCM observations are consistent with previous in-situ scanning electron microscopy (SEM) studies: The onset of crystal plasticity occurs primarily near Σ3 twin boundaries with bulk locations in the elastic domain (macroscopic stress as low as 80% of the 0.2 % offset yield strength (Y.S.0.2%)). This intense irreversible strain localization occurs with either a high Schmid factor (μ > 0.43) or a significant elastic modulus difference between the pair of twins (ΔΕ > 100 GPa). In the plastic Deformation domain, transgranular slip activity following slip systems with the highest Schmid factor is mostly responsible for the Deformation at the grain level, thus leading to strain percolation. The simultaneous in-Plane and out-of-Plane Deformation assessment via the HR-LSCM-DIC technique was found to be essential for the identification of active slip systems. Finally, the HR-LSCM-DIC technique enabled the quantification of the real glide amplitude involved in the three-dimensional shearing process at the grain level that solely in-Plane measurements cannot provide.

Cunjiang Yu - One of the best experts on this subject based on the ideXlab platform.

  • in Plane Deformation mechanics for highly stretchable electronics
    Advanced Materials, 2017
    Co-Authors: Yewang Su, Xuecheng Ping, Ki Jun Yu, Bo Wang, Ming Li, Rui Li, Daniel V Harburg, Yong An Huang, Cunjiang Yu
    Abstract:

    : Scissoring in thick bars suppresses buckling behavior in serpentine traces that have thicknesses greater than their widths, as detailed in a systematic set of analytical and experimental studies. Scissoring in thick copper traces enables elastic stretchability as large as ≈350%, corresponding to a sixfold improvement over previously reported values for thin geometries (≈60%).

Yong An Huang - One of the best experts on this subject based on the ideXlab platform.

  • in Plane Deformation mechanics for highly stretchable electronics
    Advanced Materials, 2017
    Co-Authors: Yewang Su, Xuecheng Ping, Ki Jun Yu, Bo Wang, Ming Li, Rui Li, Daniel V Harburg, Yong An Huang, Cunjiang Yu
    Abstract:

    : Scissoring in thick bars suppresses buckling behavior in serpentine traces that have thicknesses greater than their widths, as detailed in a systematic set of analytical and experimental studies. Scissoring in thick copper traces enables elastic stretchability as large as ≈350%, corresponding to a sixfold improvement over previously reported values for thin geometries (≈60%).