In magnetic disk drive actuators, requirements to record and read data at higher track densities has made mechanical resonances of the servo actuator, suspension and the head gimbal assembly a critial consideration. The application of piezo electric material in the servo actuator can be used to re ne and accomplish track following in (extremely) high track density magnetic data storage by contr...

The development of a fluid cell with an acoustic radiation pressure ARP actuator for atomic force microscopy AFM is reported. The ARP actuator uses a zinc oxide thin film transducer fabricated on a silicon substrate to generate acoustic waves in the 120–180 MHz range. These waves are coupled to the liquid and are reflected off of the AFM cantilever exerting radiation pressure to move the AFM ca...

TCERA (Tunable Compliance Energy Return Actuator) is a robotic actuator inspired by properties and behavior of the human knee joint, in that it utilizes antagonistic contraction to vary torsional stiffness and joint angle. The actuator is an electrically activated artificial muscle which uses two constant air-mass pneumatic springs configured antagonistically about the knee joint. The positions...

This paper discusses a state space estimation for an electromechanical actuator valve using extended Kalman filter (EKF). A proposed actuator model includes a Tustin’s friction model with strong nonlinearities, hence it represents an accurate model for describing the friction phenomenon in an electromechanical actuator valve. At first the state equations of the model were converted into a time-...

A 2-Degrees of freedom powered prosthetic wrist actuator has been proposed that can provide the Abduction/Adduction & Flexion/Extension movements of the human wrist. The basic structure of the actuator is a Ball and Socket joint and the force is transmitted from the DC geared servo motors to the joint through the Bowden cables. The proposed design is capable of providing the required DOF in bot...

This paper reports on the design of a biorobotic actuator. Biological requirements are developed from published reports in the muscle physiology literature whose parameters are extracted and applied in the form of the Hill muscle model. Data from several vertebrate species (rat, frog, cat, and human) are used to evaluate the performance of a McKibben pneumatic actuator. The experimental results...

Introduce the structure and working principle of precision giant magnetostrictive actuator and establish the actuator system object transfer function model so as to design a suitable active disturbance rejection controller (ADRC). According to the model analysis, regard the actuator system as a first-order inertia object with dead time to construct second-order ADRC, use MATLAB for parameter tu...

The electro-mechanical actuators are used in aerospace vehicle is used for attitude control of vehicle. Actuators used in aerospace vehicle require very accurate positioning accuracy, high dynamic requirements. Hence the actuator design in aerospace vehicle is very critical and plays very important role in total performance of the vehicle. The actuators are to be designed very compactly with hi...

The problems of control of robot manipulators with actuation degradation and detection of actuation faults are addressed in this paper. An adaptive fault tolerant control method is proposed for robot manipulators to maintain the required performance in the presence of actuation degradation, and the same adaptive algorithm is utilized to detect actuation failures. The proposed method can compens...

Substantial damage may occur when a rotary actuator fails during operation. Therefore, effective fault diagnosis of a rotary actuator is crucial to ensuring the safety of the device. However, only a few studies on fault detection, fault isolation, and performance assessment have focused on rotary actuators. In this study, fault detection and fault isolation processes were implemented by designi...