The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform

Harry H Asada - One of the best experts on this subject based on the ideXlab platform.

  • Large Effective-Strain Piezoelectric Actuators Using Nested Cellular Architecture With Exponential Strain Amplification Mechanisms
    IEEE ASME Transactions on Mechatronics, 2010
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    Design and analysis of Piezoelectric actuators having over 20% effective strain using an exponential strain amplification mechanism are presented in this paper. Piezoelectric Ceramic Material, such as lead zirconate titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e., only 0.1%, has been a major bottleneck for broad applications. This paper presents a new strain amplification design, called a “nested rhombus” multilayer mechanism, that increases strain exponentially through its hierarchical cellular structure. This allows for over 20% effective strain. In order to design the whole actuator structure, not only the compliance of Piezoelectric Material but also the compliance of the amplification structures needs to be taken into account. This paper addresses how the output force and displacement are attenuated by the compliance involved in the strain amplification mechanism through kinematic and static analysis. An insightful lumped parameter model is proposed to quantify the performance degradation and facilitate design tradeoffs. A prototype-nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.5 mm displacement from 12-mm actuator length and 30 mm width) and 1.7 N blocking force.

  • static lumped parameter model for nested pzt cellular actuators with exponential strain amplification mechanisms
    International Conference on Robotics and Automation, 2008
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    A static lumped parameter model is proposed for the design and analysis of nested Piezoelectric cellular actuators with exponential strain amplification mechanisms. Piezoelectric Ceramic Material, such as Lead Zirconate Titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e. only 0.1%, has been a major bottleneck for broad applications. We have proposed a "nested rhombus" multi-layer mechanism for PZT actuators, which increases strain exponentially through its hierarchical cellular structure, for over 20% effective strain. To drive a large load, however, care must be taken in the design of the strain amplification structure. Through kinematic and static analysis this paper addresses how the output force and displacement are attenuated by the joint stiffness and beam compliance involved in the strain amplification mechanism. An insightful lumped parameter model is developed to quantify the performance degradation and facilitate design trade-offs. A prototype nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.49 mm displacement from 12 mm actuator length) and 1.7 N blocking force.

  • Piezoelectric cellular actuators using nested rhombus multilayer mechanisms
    ASME 2008 Dynamic Systems and Control Conference Parts A and B, 2008
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    Piezoelectric Ceramic Material, such as Lead Zirconate Titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e. only 0.1%, has been a major bottleneck for broad applications. We have proposed a “nested rhombus” multi-layer mechanism for PZT actuators, which increases strain exponentially through its hierarchical cellular structure, for over 20% effective strain. To drive a large load, however, care must be taken in the design of the strain amplification structure. Through kinematic and static analysis this paper addresses how the output force and displacement are attenuated by the joint stiffness and beam compliance involved in the strain amplification mechanism. An insightful lumped parameter model is developed to quantify the performance degradation and facilitate design tradeoffs. A prototype nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.49 mm displacement from 12 mm actuator length) and 1.7 N blocking force.Copyright © 2008 by ASME

Jun Ueda - One of the best experts on this subject based on the ideXlab platform.

  • Large Effective-Strain Piezoelectric Actuators Using Nested Cellular Architecture With Exponential Strain Amplification Mechanisms
    IEEE ASME Transactions on Mechatronics, 2010
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    Design and analysis of Piezoelectric actuators having over 20% effective strain using an exponential strain amplification mechanism are presented in this paper. Piezoelectric Ceramic Material, such as lead zirconate titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e., only 0.1%, has been a major bottleneck for broad applications. This paper presents a new strain amplification design, called a “nested rhombus” multilayer mechanism, that increases strain exponentially through its hierarchical cellular structure. This allows for over 20% effective strain. In order to design the whole actuator structure, not only the compliance of Piezoelectric Material but also the compliance of the amplification structures needs to be taken into account. This paper addresses how the output force and displacement are attenuated by the compliance involved in the strain amplification mechanism through kinematic and static analysis. An insightful lumped parameter model is proposed to quantify the performance degradation and facilitate design tradeoffs. A prototype-nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.5 mm displacement from 12-mm actuator length and 30 mm width) and 1.7 N blocking force.

  • static lumped parameter model for nested pzt cellular actuators with exponential strain amplification mechanisms
    International Conference on Robotics and Automation, 2008
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    A static lumped parameter model is proposed for the design and analysis of nested Piezoelectric cellular actuators with exponential strain amplification mechanisms. Piezoelectric Ceramic Material, such as Lead Zirconate Titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e. only 0.1%, has been a major bottleneck for broad applications. We have proposed a "nested rhombus" multi-layer mechanism for PZT actuators, which increases strain exponentially through its hierarchical cellular structure, for over 20% effective strain. To drive a large load, however, care must be taken in the design of the strain amplification structure. Through kinematic and static analysis this paper addresses how the output force and displacement are attenuated by the joint stiffness and beam compliance involved in the strain amplification mechanism. An insightful lumped parameter model is developed to quantify the performance degradation and facilitate design trade-offs. A prototype nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.49 mm displacement from 12 mm actuator length) and 1.7 N blocking force.

  • Piezoelectric cellular actuators using nested rhombus multilayer mechanisms
    ASME 2008 Dynamic Systems and Control Conference Parts A and B, 2008
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    Piezoelectric Ceramic Material, such as Lead Zirconate Titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e. only 0.1%, has been a major bottleneck for broad applications. We have proposed a “nested rhombus” multi-layer mechanism for PZT actuators, which increases strain exponentially through its hierarchical cellular structure, for over 20% effective strain. To drive a large load, however, care must be taken in the design of the strain amplification structure. Through kinematic and static analysis this paper addresses how the output force and displacement are attenuated by the joint stiffness and beam compliance involved in the strain amplification mechanism. An insightful lumped parameter model is developed to quantify the performance degradation and facilitate design tradeoffs. A prototype nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.49 mm displacement from 12 mm actuator length) and 1.7 N blocking force.Copyright © 2008 by ASME

Thomas W Secord - One of the best experts on this subject based on the ideXlab platform.

  • Large Effective-Strain Piezoelectric Actuators Using Nested Cellular Architecture With Exponential Strain Amplification Mechanisms
    IEEE ASME Transactions on Mechatronics, 2010
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    Design and analysis of Piezoelectric actuators having over 20% effective strain using an exponential strain amplification mechanism are presented in this paper. Piezoelectric Ceramic Material, such as lead zirconate titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e., only 0.1%, has been a major bottleneck for broad applications. This paper presents a new strain amplification design, called a “nested rhombus” multilayer mechanism, that increases strain exponentially through its hierarchical cellular structure. This allows for over 20% effective strain. In order to design the whole actuator structure, not only the compliance of Piezoelectric Material but also the compliance of the amplification structures needs to be taken into account. This paper addresses how the output force and displacement are attenuated by the compliance involved in the strain amplification mechanism through kinematic and static analysis. An insightful lumped parameter model is proposed to quantify the performance degradation and facilitate design tradeoffs. A prototype-nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.5 mm displacement from 12-mm actuator length and 30 mm width) and 1.7 N blocking force.

  • static lumped parameter model for nested pzt cellular actuators with exponential strain amplification mechanisms
    International Conference on Robotics and Automation, 2008
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    A static lumped parameter model is proposed for the design and analysis of nested Piezoelectric cellular actuators with exponential strain amplification mechanisms. Piezoelectric Ceramic Material, such as Lead Zirconate Titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e. only 0.1%, has been a major bottleneck for broad applications. We have proposed a "nested rhombus" multi-layer mechanism for PZT actuators, which increases strain exponentially through its hierarchical cellular structure, for over 20% effective strain. To drive a large load, however, care must be taken in the design of the strain amplification structure. Through kinematic and static analysis this paper addresses how the output force and displacement are attenuated by the joint stiffness and beam compliance involved in the strain amplification mechanism. An insightful lumped parameter model is developed to quantify the performance degradation and facilitate design trade-offs. A prototype nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.49 mm displacement from 12 mm actuator length) and 1.7 N blocking force.

  • Piezoelectric cellular actuators using nested rhombus multilayer mechanisms
    ASME 2008 Dynamic Systems and Control Conference Parts A and B, 2008
    Co-Authors: Jun Ueda, Thomas W Secord, Harry H Asada
    Abstract:

    Piezoelectric Ceramic Material, such as Lead Zirconate Titanate (PZT), has large stress and bandwidth, but its extremely small strain, i.e. only 0.1%, has been a major bottleneck for broad applications. We have proposed a “nested rhombus” multi-layer mechanism for PZT actuators, which increases strain exponentially through its hierarchical cellular structure, for over 20% effective strain. To drive a large load, however, care must be taken in the design of the strain amplification structure. Through kinematic and static analysis this paper addresses how the output force and displacement are attenuated by the joint stiffness and beam compliance involved in the strain amplification mechanism. An insightful lumped parameter model is developed to quantify the performance degradation and facilitate design tradeoffs. A prototype nested PZT cellular actuator that weighs only 15 g has produced 21% effective strain (2.49 mm displacement from 12 mm actuator length) and 1.7 N blocking force.Copyright © 2008 by ASME

Jiayi Chen - One of the best experts on this subject based on the ideXlab platform.

  • a microscale linear phased array ultrasonic transducer based on pzt Ceramics
    Sensors, 2019
    Co-Authors: Xuejiao Jiang, Wen Wang, Xianmei Wu, Jiayi Chen
    Abstract:

    In this paper, a microscale high-frequency ultrasonic transducer was prepared by combining traditional planar ultrasonic phased-array technology and micro processing technology. The Piezoelectric Ceramic Material PZT was used as the functional Material of the transducer. The number of the arrays was 72, the width of each array was 50 μm, the pitch of each array was 70 μm, and the length of each array was 3 mm. The PZT chip was finely ground to a thickness of 130 μm and could reach a frequency of 10 MHz. The experimental platform of micron-scale precision was set up for a beam-forming lateral sound field test and imaging experiment to validate the theoretical analysis. The echo imaging test showed that a mold with a feature size of about 400 μm could be imaged well.

Michael J. Worswick - One of the best experts on this subject based on the ideXlab platform.

  • Antiplane mechanical and inplane electric time-dependent load applied to two coplanar cracks in Piezoelectric Ceramic Material
    Theoretical and Applied Fracture Mechanics, 2000
    Co-Authors: Zengtao Chen, Michael J. Worswick
    Abstract:

    This work is concerned with the dynamic response of two coplanar cracks in a Piezoelectric Ceramic under antiplane mechanical and inplane electric time-dependent load. The cracks are assumed to act either as an insulator or as a conductor. Laplace and Fourier transforms are used to reduce the mixed boundary value problems to Cauchy-type singular integral equations in Laplace transform domain. A numerical Laplace inversion algorithm is used to determine the dynamic stress and electric displacement factors that depend on time and geometry. A normalized equivalent parameter describing the ratio of the equivalent magnitude of electric load to that of mechanical load is introduced in the numerical computation of the dynamic stress intensity factor (DSIF) which has a similar trend as that for the pure elastic Material. The results show that the dynamic electric field will impede or enhance crack propagation in a Piezoelectric Ceramic Material at different stages of the dynamic electromechanical load. Moreover, the electromechanical response is greatly affected by the ratio of the crack length to the ligament between the cracks. The stress and electric displacement intensity factor can be combined by the energy density factor or function to address the fracture of Piezoelectric Materials under the combined influence of electromechanical loading.