The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform

Benjamin K.s. Woods - One of the best experts on this subject based on the ideXlab platform.

  • Bidirectional Spiral Pulley Negative Stiffness Mechanism for Passive Energy Balancing
    Journal of Mechanisms and Robotics, 2019
    Co-Authors: Jiaying Zhang, Alexander D. Shaw, Michael I. Friswell, Mohammadreza Amoozgar, Benjamin K.s. Woods
    Abstract:

    The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative Stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative Stiffness mechanism. This uses a cable connected with a pre-tension spring to convert the decreasing spring force into the increasing balanced torque. The kinematics of the spiral pulley is first developed for bidirectional actuation, and its geometry is then optimized by employing an energy conversion efficiency function. The performance of the optimized bidirectional spiral pulley is then evaluated through the net torque, the total required energy, and energy conversion efficiency. Then, an additional test rig tests the bidirectional negative Stiffness Property and compares the characteristics with the corresponding analytical result. Exploiting the negative Stiffness mechanism is of significant interest not only in the field of morphing aircraft but also in many other energy and power reduction applications.

  • Spiral Pulley Negative Stiffness Mechanism for Morphing Aircraft Actuation
    Volume 5B: 42nd Mechanisms and Robotics Conference, 2018
    Co-Authors: Jiaying Zhang, Alexander D. Shaw, Amoozgar Mohammadreza, Michael I. Friswell, Benjamin K.s. Woods
    Abstract:

    The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative Stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative Stiffness mechanism. This uses a cable connected with a pre-tension spring to covert decreasing spring force into increasing balanced torque. The kinematics of the spiral pulley are firstly developed and its geometry is then optimised by employing an energy conversion efficiency function. The performance of the optimised spiral pulley is then evaluated through the net torque, the total required energy and energy conversion efficiency. An experiment demonstrates the negative Stiffness Property of the mechanism and compares its characteristics with the analytical result. Exploiting the negative Stiffness mechanism has a significant interest in not only the field of morphing aircraft but many other power reduction applications.an increasing output torque. The kinematics of the spiral pulley are firstly developed and its geometry is then optimised by employing an energy conversion efficiency function. The performance of the optimised spiral pulley is then evaluated through the net torque, the total required energy and energy conversion efficiency. An experiment demonstrates the negative Stiffness Property of the mechanism and compares its characteristics with the analytical result. Exploiting the negative Stiffness mechanism has a significant interest in not only the field of morphing aircraft but also many other energy and power reduction applications.

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

  • Bidirectional Spiral Pulley Negative Stiffness Mechanism for Passive Energy Balancing
    Journal of Mechanisms and Robotics, 2019
    Co-Authors: Jiaying Zhang, Alexander D. Shaw, Michael I. Friswell, Mohammadreza Amoozgar, Benjamin K.s. Woods
    Abstract:

    The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative Stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative Stiffness mechanism. This uses a cable connected with a pre-tension spring to convert the decreasing spring force into the increasing balanced torque. The kinematics of the spiral pulley is first developed for bidirectional actuation, and its geometry is then optimized by employing an energy conversion efficiency function. The performance of the optimized bidirectional spiral pulley is then evaluated through the net torque, the total required energy, and energy conversion efficiency. Then, an additional test rig tests the bidirectional negative Stiffness Property and compares the characteristics with the corresponding analytical result. Exploiting the negative Stiffness mechanism is of significant interest not only in the field of morphing aircraft but also in many other energy and power reduction applications.

  • Spiral Pulley Negative Stiffness Mechanism for Morphing Aircraft Actuation
    Volume 5B: 42nd Mechanisms and Robotics Conference, 2018
    Co-Authors: Jiaying Zhang, Alexander D. Shaw, Amoozgar Mohammadreza, Michael I. Friswell, Benjamin K.s. Woods
    Abstract:

    The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative Stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative Stiffness mechanism. This uses a cable connected with a pre-tension spring to covert decreasing spring force into increasing balanced torque. The kinematics of the spiral pulley are firstly developed and its geometry is then optimised by employing an energy conversion efficiency function. The performance of the optimised spiral pulley is then evaluated through the net torque, the total required energy and energy conversion efficiency. An experiment demonstrates the negative Stiffness Property of the mechanism and compares its characteristics with the analytical result. Exploiting the negative Stiffness mechanism has a significant interest in not only the field of morphing aircraft but many other power reduction applications.an increasing output torque. The kinematics of the spiral pulley are firstly developed and its geometry is then optimised by employing an energy conversion efficiency function. The performance of the optimised spiral pulley is then evaluated through the net torque, the total required energy and energy conversion efficiency. An experiment demonstrates the negative Stiffness Property of the mechanism and compares its characteristics with the analytical result. Exploiting the negative Stiffness mechanism has a significant interest in not only the field of morphing aircraft but also many other energy and power reduction applications.

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

  • semi active variable Stiffness vibration control of vehicle seat suspension using an mr elastomer isolator
    Smart Materials and Structures, 2011
    Co-Authors: Haiping Du, Weihua Li, Nong Zhang
    Abstract:

    This paper presents a study on continuously variable Stiffness control of vehicle seat suspension using a magnetorheological elastomer (MRE) isolator. A concept design for an MRE isolator is proposed in the paper and its behavior is experimentally evaluated. An integrated seat suspension model, which includes a quarter-car suspension and a seat suspension with a driver body model, is used to design a sub-optimal controller for an active isolator. The desired control force generated by this active isolator is then emulated by the MRE isolator through its continuously variable Stiffness Property when the actuating condition is met. The vibration control effect of the MRE isolator is evaluated in terms of driver body acceleration responses under both bump and random road conditions. The results show that the proposed control strategy achieves better vibration reduction performance than conventional on–off control.

Jinsong Leng - One of the best experts on this subject based on the ideXlab platform.

  • Variable Stiffness Property study on shape memory polymer composite tube
    Smart Materials and Structures, 2012
    Co-Authors: Yijin Chen, Jian Sun, Yanju Liu, Jinsong Leng
    Abstract:

    As a typical smart material, shape memory polymers (SMPs) have the capability of variable Stiffness in response to external stimuli, such as heat, electricity, magnetism and solvents. In this research, a shape memory polymer composite (SMPC) tube composed of multi-layered filament wound structures is investigated. The SMPC tube possesses considerable flexibility under high temperature and rigidity under low temperature. Significant changes in effective engineering modulus can be achieved through regulating the environment temperature. Based on the classical laminated-plate theory and Sun’s thick laminate analysis, a 3D theory method is used to study the effective engineering modulus and modulus ratio of the SMPC tube. The tensile test is conducted on the SMPC tube to verify the accuracy of the theoretical method. In addition, the effective engineering modulus and modulus ratio are discussed under different fiber-winding angles and fiber volume fractions of the SMPC tube. The presented analysis provides meaningful guidance to assist the design and manufacture of SMPC tubes in morphing skin applications.

Alexander D. Shaw - One of the best experts on this subject based on the ideXlab platform.

  • Bidirectional Spiral Pulley Negative Stiffness Mechanism for Passive Energy Balancing
    Journal of Mechanisms and Robotics, 2019
    Co-Authors: Jiaying Zhang, Alexander D. Shaw, Michael I. Friswell, Mohammadreza Amoozgar, Benjamin K.s. Woods
    Abstract:

    The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative Stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative Stiffness mechanism. This uses a cable connected with a pre-tension spring to convert the decreasing spring force into the increasing balanced torque. The kinematics of the spiral pulley is first developed for bidirectional actuation, and its geometry is then optimized by employing an energy conversion efficiency function. The performance of the optimized bidirectional spiral pulley is then evaluated through the net torque, the total required energy, and energy conversion efficiency. Then, an additional test rig tests the bidirectional negative Stiffness Property and compares the characteristics with the corresponding analytical result. Exploiting the negative Stiffness mechanism is of significant interest not only in the field of morphing aircraft but also in many other energy and power reduction applications.

  • Spiral Pulley Negative Stiffness Mechanism for Morphing Aircraft Actuation
    Volume 5B: 42nd Mechanisms and Robotics Conference, 2018
    Co-Authors: Jiaying Zhang, Alexander D. Shaw, Amoozgar Mohammadreza, Michael I. Friswell, Benjamin K.s. Woods
    Abstract:

    The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative Stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative Stiffness mechanism. This uses a cable connected with a pre-tension spring to covert decreasing spring force into increasing balanced torque. The kinematics of the spiral pulley are firstly developed and its geometry is then optimised by employing an energy conversion efficiency function. The performance of the optimised spiral pulley is then evaluated through the net torque, the total required energy and energy conversion efficiency. An experiment demonstrates the negative Stiffness Property of the mechanism and compares its characteristics with the analytical result. Exploiting the negative Stiffness mechanism has a significant interest in not only the field of morphing aircraft but many other power reduction applications.an increasing output torque. The kinematics of the spiral pulley are firstly developed and its geometry is then optimised by employing an energy conversion efficiency function. The performance of the optimised spiral pulley is then evaluated through the net torque, the total required energy and energy conversion efficiency. An experiment demonstrates the negative Stiffness Property of the mechanism and compares its characteristics with the analytical result. Exploiting the negative Stiffness mechanism has a significant interest in not only the field of morphing aircraft but also many other energy and power reduction applications.