A dynamic model for a displacement amplified magnetostrictive driver for active mounts

Abstract

A magnetostrictive actuator with a hydraulic displacement amplification mechanism is designed to be used as a driver in active engine mounts. The dynamic response of the actuator is quantified in terms of the output displacement and the magnetostriction. Eddy current losses are modeled as a one-dimensional magnetic diffusion problem in cylindrical coordinates. The Jiles-Atherton model is used to describe the magnetization state of the material as a function of applied magnetic fields. Magnetostriction, which is modeled as a single-valued function of magnetization, provides an input to the mechanical model describing the system vibrations. Friction at the elastomeric seals is modeled using the LuGre (Lund-Grenoble) friction model for lubricated contacts. Results show that the model accurately describes the dynamic behavior of the actuator up to 500 Hz. An order analysis of the data and calculated responses shows that the model describes the fundamental and higher-order spectral components generated by the device.

Coupled axisymmetric finite element model of a hydraulically amplified magnetostrictive actuator for active powertrain mounts

“…The model describes the effect of compliance of the fluid chamber components. Here, b is the effective bulk modulus of the fluid, while in the lumped parameter model [9], b eff represented an effective modulus describing the combined compliance of the fluid and fluid chamber components.…”

“…As a result, linear models considering 100% energy transmission greatly overestimate the performance of these actuators [3,8]. Chakrabarti and Dapino [9] developed a lumped parameter model considering seal friction, nonlinear Terfenol-D material response and compliance of the fluid chamber components to model the dynamic mechanical response of a magneto-hydraulic actuator. Despite the model's value as an analysis tool, it is not suitable for transducer design because fluid chamber compliance and current-field relationships are difficult to accurately quantify in lumped parameter models.…”

Output characteristics of giant magnetostrictive force sensor under the effect of various factors

“…The emergence of giant magnetostrictive materials (GMM) provides a new type of sensitive materials for the development of magnetostrictive force sensor. By right of its excellent characteristics of large magnetostrictive coefficient at room temperature (1,500 × 10 -6 -2,000 × 10 -6 ) which is 100 to 1,000 times higher than that of common magnetostrictive materials (Chakrabarti and Dapino, 2010), low magnetocrystalline anisotropy, high magnetomechanical coupling coefficient, fast response speed, etc., GMM attracts wide attention at home and in abroad academic circles, and industrial community (Chaudhuri et al, 2009).…”

Fully coupled discrete energy-averaged model for Terfenol-D

“…For this reason, the Jiles-Atherton model has been used to describe the behavior of Terfenol-D actuators in which the magnetostriction is modeled as a quadratic function of magnetization. [3][4][5] The Preisach model 6 generates smooth ferromagnetic hysteresis curves through contributions from a large number of elementary bistable hysterons. Because giant magnetostrictive materials such as Terfenol-D show significant deviation in behavior from elementary Preisach hysterons, Reimers and Della Torre 7,8 developed a special hysteron with a bimodally distributed susceptibility function to describe the 1D actuation response of Terfenol-D.…”