Electrostatic, comb-drive actuators have been designed for applications requiring displacements of up to 150 μm in less than 1 msec. A nonlinear model of the actuator relates the resonant frequency and the maximum stable deflection to the actuator dimensions. A suite of experiments that were carried out on DRIE, single-crystal silicon, comb-drive actuators confirm the validity of the model. Fou...

This paper presents the detailed model of a double clutch actuator with a suitable control algorithm. Firstly, there is an introduction into the theory of a double clutch transmission and the aim of this project. The simulation model with a Dymola R © and a MATLAB R ©/Simulink R © part is discussed. The library of a vehicle model with a highly detailed hydromechanical clutch is introduced, whic...

This paper gives a new approach for modeling the fluid-structure interaction of servovalve component-actuator. The analyzed valve is a precision flow control valve-jet pipe electrohydraulic servovalve. The positioning of an actuator depends upon the flow rate from control ports, in turn depends on the spool position. Theoretical investigation is made for No-load condition and Load condition for...

Joint flexibility is a very important factor to consider in the controller design for robot manipulators if high performance is expected. Most of the research works on control of flexible-joint robots in literature have ignored the actuator dynamics to avoid complexity in controller design. The problem of designing nonlinear controller for a class of single-link flexible-joint robot manipulator...

This paper addresses the design of an observer-based fault diagnosis scheme, which is applied to some of the sensors and actuators of a wind turbine benchmark model. The methodology is based on a modified sliding mode observer (SMO) that allows accurate reconstruction of multiple sensor or actuator faults occurring simultaneously. The faults are reconstructed using the equivalent output err...

The dynamic lift response of an airfoil to sinusoidal amplitude variations from a synthetic jet actuator was studied. The wing was at a fixed angle of attack, and the actuator operated in a ‘burst-mode’ with a fixed duty cycle. The actuator burst amplitude was used as a control signal, which was varied between an ‘off’ condition and the actuator saturation voltage. Three dimensionless frequenci...

A single crystal silicon MEMS microactuator for high density hard disk drives is described in this paper. The microactuator is located between a slider and a suspension, and drives the slider on which a magnetic head is attached. The MEMS actuator is fabricated by improved LISA process. It has an electrically isolated 20:1 (40μm thick, 2μm width) high aspect ratio structure directly processed f...

Attaining a controlled output strain and utilizing a full potential of active material are the significant factors to design Terfenol-D actuator devises such as active damping devices, high speed hydraulic valve actuators, large-force linear motors and large torque rotating motors. To achieve this, a high magnetic biasing field is required in an actuator. The present work attempts to propose a ...

Parallel mechanisms driven by fixed linear actuators promise high speed and high output, thanks to lightweight movable parts. Several types of mechanism applying this mechanical principle are already known. Although these have different methods of actuator arrangement, they may be considered the same mechanism since they can be treated using the same kinematics. However, it is not known how the...

|Glaucoma is an eye disease which is caused by abnormal high IOP (Intra Ocular Pressure) in the eye. The use of implants is increasing in these days in order to treat the glaucoma. However, though conventional implants have a capability of pressure regulation, they cannot maintain IOPs desired for di erent patients. To solve these problems, it is needed to develop a new implant which is capable...