The presence of van der Waals (vdW) force can lead to mechanical instability in freestanding nano-scale actuators. Most of the previous researches in this area have exclusively focused on modeling the instability in actuators with one actuating components. While, less attention has been paid to actuators consist of two actuating components. Herein, the effect of the vdW force on the instability...

Since the structural mechanics of super magnetostrictive actuator (GMA) system involves problems related to viscoelastic damping materials, fractional order is more accurate than integer calculus characterize features in structure. In further investigate intrinsic mechanism and dynamical characteristics GMA system, equations nonlinear containing terms are established main resonance analyzed usi...

In this paper, a quaternion-based finite-time sliding mode attitude controller is designed for a spacecraft performing high-thrust orbital maneuvers, with cold gas thrusters as its actuators. The proposed controller results are compared with those of a quaternion feedback controller developed for the linearized spacecraft dynamics, in terms of settling time, steady-state error, number of thrust...

Abstract: Subject of this paper is a method for consideration of control variable limits of single actuators in a redundant driven kinematic structure of a wheeled mobile robot (wmr). It is assumed that the desired robot state is given by the translational and rotational velocity of a coordinate system fixed to the robot frame. With the assumption of rigid body elements, motion is possible only...

There are two different ways of using SMA wires as actuators for shape control of flexible structures; which can be either embedded within the composite laminate or externally attached to the structure. Since the actuator can be placed at different offset distances from the beam, external actuators produce more bending moment and, consequently, considerable shape changes with the same magnitude...

This paper addresses the development of inverse compensation techniques for a class of ferromagnetic transducers including magnetostrictive actuators. If unaccommodated, the hys-teresis and nonlinear dynamics can produce severe loss of control authority and potential instabilities when the actuators are incorporated in control design. In this work, hysteresis is modeled through the domain wall ...