One of the best vibration control methods using smart actuators are semi-active approaches which are as strong as active methods and need no external energy supply such as passive ones. Compared with piezoelectric-based, MAGNETOSTRICTIVE-based control methods have higher coupling efficiency, higher Curie temperature, higher flexibility to be integrated with curved structures and no depolarization problems. Semi-active methods are well developed for piezoelectrics but MAGNETOSTRICTIVE-based approaches are not as efficient, powerful and well known as piezoelectric-based methods. The aim of this work is to propose a powerful semi-active control method using MAGNETOSTRICTIVE actuators. In this paper a new type of semi-active suppression methods using MAGNETOSTRICTIVE materials is introduced which contains an equipped vibrating structure with MAGNETOSTRICTIVE patches wound by a pick-up coil connected to an electronic switch and a capacitor. The novelty of the proposed damping method is switching on the coil current signal using mentioned switch and capacitor, which is briefly named SSDC (synchronized switch damping on capacitor). In this paper, the characteristics of the semi-active pulse-switching damping technique with MAGNETOSTRICTIVE materials are studied and numerical results show significant damping for almost all types of excitations.

This paper presents the analysis of vibration control of a laminated composite beam that including MAGNETOSTRICTIVE layers. The formulation of problem is presented based on the shear deformation beam theory. For vibration suppression, the velocity feedback control with constant gain distributed is considered. Navier's method is applied to analyze the solution of vibration suppression of laminated beam with the simply-supported boundary conditions. The influence of lamination schemes, modes, number of smart layers at the structure, the control gain of the magnetic field intensity and smart layer position on suppress of the vibration are discussed. In addition, the controlled motion of some special laminated composite beam is tested.

In this research, a control feedback system is used to study the free vibration response of rectangular plate made of MAGNETOSTRICTIVE material (MsM) for the first time. A new trigonometric higher order shear deformation plate theory are utilized and the results of them are compared with two theories in order to clarify their accuracy and errors. Pasternak foundation is selected to modelling of elastic medium due to considering both normal and shears modulus. Also in-plane forces are uniformly applied on MAGNETOSTRICTIVE nano-plate (MsNP) in x and y directions. Nonlocal motion equations are derived using Hamilton’s principle and solved by differential quadrature method (DQM) considering different boundary conditions. Results indicate the effect of various parameters such as aspect ratio, thickness ratio, elastic medium, compression and tension loads and small scale effect on vibration behaviour of MsNP especially the controller effect of velocity feedback gain to minimizing the frequency. These finding can be used to active noise and vibration cancellation systems in micro and nano smart structures.

This paper presents a MAGNETOSTRICTIVE in-pipe impact drive mechanism (IDM). To estimate the output performances of the IDM, a dynamics model was developed based on the MAGNETOSTRICTIVE material constitutive model and mechanical model of the IDM. Therefore, an experimental system has been built to test the motion performance of IDM. Simulation and experimental results illustrate that the proposed model can accurately predict the step-size of the IDM. The working frequency of the designed IDM is from 10 to 120 Hz, with a the step-size resolution of 740 nm. The MAGNETOSTRICTIVE IDM performs good linearity, and can be applied to precision positioning.

The present study investigates a novel two degrees of freedom (2DOF) modeling of hybrid-bistable vibration energy harvester (VEH) considering nonlinear magnetic interaction and elastic magnifier to improve the efficiency and expand the action bandwidth. The main part of harvesting mechanism is a composite cantilever beam consists of three layers of MAGNETOSTRICTIVE, piezoelectric and a metallic core with internal damping. Such a novel architecture generates more electrical power and operates at larger bandwidth than common piezoelectric or MAGNETOSTRICTIVE energy harvesting systems. In the present work, a coupled 2DOF model is developed to investigate the vibration behavior and energy harvesting rate of the harvester. The harmonic balance method is used to obtain the frequency responses and then the Runge-Kutta method is utilized to calculate the dynamic responses. A parametric study is done to investigate the effects of the key features of the harvester such as magnets distances, base acceleration level and excitation frequency on the rate of electricity generation.