Modeling, optimization, and control of magnetostrictive high force-to-mass ratio reaction mass actuators

Abstract

A magnetostrictive reaction mass actuator possessing a large force to weight ratio has recently been developed at SatCon Technology Corporation. Achieving such high performance requires adequate modeling of this multidisciplinary device. The developed models allow performance optimization to be accomplished through parameter selection and control design.At the 1996 smart materials conference, the modeling and design issues associated with this actuator were discussed. Since that time, additional experiments and optimization have been performed that validate the proposed modeling. These experiments include validation of the thermal modeling and dynamic model validation through control experimentation. In addition to these results, a discussion of the trade-offs in terms of eddy current, controller, and thermal requirements, will be presented.

Analytical study of active control of wave transmission through cylindrical struts

“…In order to minimize the vibrations transmitted through a cylindrical strut to a host structure, various types of actuators can be used. In the ACSR control system developed by Westland Helicopters [3] electro-hydraulic actuators were used, and in the vibration-isolation system reported by Dozor et al [18,19] magnetostrictive actuators were used at the gearbox-fuselage interface. In the RHINO project, first piezoelectric actuators were considered by Brennan et al [20], and later, magnetostrictive actuators were used as mentioned in section 1.…”

“…where n and N are the number of turns per length of the solenoid and the number of turns of the coil, respectively. After substituting equation (19) into equation (20), one arrives at…”

<title>Active control of vibration transmission through struts</title>

“…A constant electric displacement over the surface area leads to = (D3Aa) = Aa. (15) Equating expressions (13) and (15) and solving for the electric displacement leads one to = 2V ejt+O). (16) 3WAaZ…”

Magnetostrictive wire-bonding clamp for semiconductor packaging: initial prototype design, modeling, and experiments

“…A drawing of the initial prototype actuator is shown in figure 2. A variety of work has been presented on the multidisciplinary design of magnetostrictive 4 The clamp mechanism is responsible for converting electrical energy into mechanical energy through the use of magnetostrictive transduction. A solenoidal coil of wire is used to apply a control field, while bias magnets are utilized to provide a bias field.…”