Based on the Bouc-Wen model, a nonlinear hysteretic restoring force model is established with dynamic equations. The hardening and softening of material after reaching yield limit are described by force-displacement curve. Gamultiobj algorithm group search optimization (GSO) used to fit identify hysteresis curves, respectively. effectiveness for identifying parameters verified, effects two algo...

This paper describes an algorithm to control a two stage hydraulic servovalve designed for aerospace applications. The valve has a piezoelectric ring bender actuating a first stage spool with a significant amount of overlap to reduce internal leakage. The piezoelectric ring bender is a less complex and lighter alternative to a conventional torque motor. The second stage has electrical instead o...

This paper is concentrated on control system design for an XY parallel micromanipulator with piezoelectric actuation. The decoupled property of the manipulator enables the employment of single-inputsingle-output controllers for the two working axes. To compensate for nonlinear hysteresis effect stemming from piezoelectric actuator, the dynamics with Bouc-Wen hysteresis model is derived and iden...

As an important member of smart materials, magnetorheological elastomers (MREs) exhibit characteristics that their modulus can be controlled by an external magnetic field. Based on these experimental results, a viscoelastic solid model with four parameters was proposed to predict the performance of MRE. A building model, three stories high, was constructed using MATLAB SIMULINK to evaluate the ...