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This paper investigates whether and how network-induced delays positively benefit the networked active vibration control for multi-degree-of-freedom structural systems subject to earthquake excitation. By intentionally introducing proper network-induced delays in the feedback control loop, the structural control system in the networked control system architecture is described by a system with an interval...
This paper presents the design and characteristic analysis of a novel piezoelectric actuated microgripper to achieve fast and precision micro-object handling. The microgripper mechanism was firstly introduced, and a two-stage flexure-based amplification, composed of a homothetic bridge type mechanism and a parallelogram leverage mechanism, was designed to obtain a large jaw motion stroke. The kinematic,...
This paper investigates network-based H∞ fuzzy control for a self-balancing two-wheeled inverted pendulum via a T-S fuzzy model. Due to the insertion of a communication network between the pendulum and a fuzzy controller, the fuzzy control is implemented in an asynchronous way. Unlike the existing works, asynchronous constraints on fuzzy membership functions are introduced in deriving some delay-dependent...
This paper is concerned with the problem of model reference tracking control for a class of linear networked control systems (NCSs) in which a controlled plant is connected to an observer-based controller via a communication network. In the presence of network-induced delays and packet dropouts in the sensor-to-controller and controller-to-actuator connections, the inputs of the plant and the controller...
This paper presents a novel 3-DOF precision positioning stage for nanoimprint lithograph (NIL). Due to the advantages such as high positioning accuracy, dexterity, low inertial, and balanced mechanical structure, a piezo-driven flexure-based parallel mechanism is utilized. Based on Pseudo-Rigid-Body modelling theory, the kinematics of the stage is developed by simplifying the single-axis flexure hinges...
This paper presents the forward kinematics and stiffness estimation methodologies of a flexure-based five-bar micro-manipulator. The mechanical design of the micro-manipulator is firstly descried. Base on the configuration of the proposed flexure-based micro-manipulator, the whole system has been divided into a five-bar parallel mechanism and an amplification mechanism. Two mathematical expressions...
A high speed precision positioning system is developed through rotary voice coil actuator (VCA) direct driving. By use of finite element analysis (FEA) and dynamic simulation method, the dynamic characteristics of the motion system are investigated, and the magnetism distribution around the VCA has also been acquired. Considering the remnant vibration during the high-frequent starts and stops as well...
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