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A new type of electromagnetic linear actuator for vehicle active suspension is designed. Combined with the finite element analysis tool, the effect of actuator structure parameters and power parameters on actuator thrust response is studied. Based on the simulation results, a prototype of electromagnetic linear actuator is developed. By comparison of the finite element simulation results and the experimental...
The Macro/Micro Dual-drive experiment system with numerical control working platform is built. The ball screw drives the working platform macroscopic motion. The giant magnetostrictive actuator (GMA) is used to compensate the microcosmic motion error. It is proposed that the transfer function of the GMA cascaded the rate-independent hysteresis model to structure GMA system model. The variable structure...
Based on the reversibility of magnetically controlled shape memory alloy (MSMA), a new actuator is proposed with self-checking and self-control function in this paper. The actuator can suppress the periodic vibration by adjusting the magnitude of excitation voltage. Operation principle, characteristics and the sensing signal processing of the MSMA actuator are analyzed, and experimental studies are...
Plasma flow control has become a newly-rising focus of international aerodynamics and aero thermodynamics fields. Experimental investigation of NACA 0015 airfoil stall separation suppression by span wise nanosecond discharge plasma aerodynamic actuation (NDPAA) is performed in the sake of improving the flow control ability for plasma flow control. The control effects influenced by various actuation...
Plasma flow control, based on plasma aerodynamic actuation, has become a newly-rising research focus in international aerodynamic field. Sliding discharge is a novel approach to generate plasma aerodynamic actuation. In this paper, a three-electrode plasma sheet actuator driven by repetitive nanosecond pulses with negative DC component is used to generate sliding discharge, which can be called nanosecond-pulse...
In this paper, the H∞ control method as the static acceleration feedback was put forward concerned with structural uncertainty and actuator saturation. The sufficiency and necessary condition that the controller existed was proved. By simulation, it was shown that the structure could hold the favorable stability by H∞ robust control technique.
This paper described the structure of a flexible miniature pneumatic robotic system which can move in human cavities, it makes inchworm-like movement driven by a 3-DOF (Degree of Freedom) pneumatic rubber actuator and holds its positions by air chambers. The high speed switch electromagnetic valve control system was designed for the robot locomotion in tube. The valve control circuit and the valve...
In this paper, a delta operator robust sliding mode controller is presented for pneumatic muscle actuator joint model. Sampling the model, a class of delta operator system with parameter uncertainty and exogenous disturbance is obtained. Sufficient LMI conditions are developed to guarantee the existence of the discrete linear sliding surfaces. By solving the conditions, a linear sliding surface is...
As the accuracy of the control channel model directly affects the stability and the convergence of the active vibration controller for smart flexible structures, offline identification of the control channel model is inappropriate for a vibration system whose characteristic and parameter is time-varying. To solve the problem of the control channel model identification, an active vibration control...
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