This paper shows a prototype of miniature compressor driven by moving magnetic linear actuator . Based on the prototype, the dynamics of the piston and the capacity of the compressor are analyzed, which include electromagnetic field and mechanical vibration behaviors. The theoretical results are compared with some experimental results, some problems are discussed for improving the miniature mac...

This paper describes the flight dynamics contribution to a research programme in which the objective is to design, develop and fly a UAV utilising flapless flight control. A circulation control actuator concept has been tested and a Simulink model is being developed for incorporation into the aircraft simulation. Results show that bi-directional proportional control of the air vehicle is feasible.

Actuator constraint handling is necessary for many crossdirectional controllers. We discuss how optimal steady state performance can be guaranteed by modifying an internal model control structure with a non-linear element. For the simple dynamics associated with most web processes this also gives good closed-loop dynamic behaviour. Thus unconstrained control design techniques may be applied dir...

In this paper, a continuous stable tracking control algorithm is proposed for spacecraft in the presence of unknown actuator failure, control input saturation and external disturbances. The design method is based on variable structure control and has the following properties: 1) fast and accurate response in the presence of bounded disturbances; 2) robust to the partial loss of actuator effecti...

In this paper, we report the results from the analysis of a numerical model used for the design of a magnetic linear actuator with applications to fin-based locomotion. Most of the current robotic fish generate bending motion using rotary motors which implies at least one mechanical conversion of the motion. We seek a solution that directly bends the fin and, at the same time, is able to exploi...

In this paper, the non-linear dynamics of a new Shape Memory Alloy (SMA) actuator that possesses impressive payload lifting capabilities are presented. This actuator consists of 48 SMA wires mechanically bundled in parallel forming one powerful muscle. It was designed to lift up to 45.4 kg (100 lbs.), which is approximately 300 times its weight. This SMA actuator was tested in open loop experim...

Series-elastic actuation offers several important benefits to dynamic robots, including high-bandwidth force control and improved safety. While this approach has become common among legged robots, the lack of commercial series-elastic actuators and the unique design requirements of these robots leaves custom-built actuators as the only option. These custom actuators are often designed for nomin...

In this paper, a continuous globally stable tracking control algorithm is proposed for a spacecraft in the presence of unknown actuator failure, control input saturation, uncertainty in inertial matrix and external disturbances. The design method is based on variable structure control and has the following properties: (1) fast and accurate response in the presence of bounded disturbances; (2) r...