On the modeling, design and validation of two dimensional quasi-static eddy current forces in a mechanical oscillator.

Mitchell, John Anthony ; Epp, David S. ; Wittwer, Jonathan W.

Sandia National Laboratories

关键词: Eddy Currents;    Eddy Currents (Electric);    Oscillators-Design And Construction.;    Two-Dimensional Calculations;    Computerized Simulation;   

DOI  :  10.2172/876522
RP-ID  :  SAND2005-6555
RP-ID  :  AC04-94AL85000
RP-ID  :  876522

美国|英语

来源: UNT Digital Library

【 摘 要 】

Damping vibrations is important in the design of some types of inertial sensing devices. One method for adding damping to a device is to use magnetic forces generated by a static magnetic field interacting with eddy currents. In this report, we develop a 2-dimensional finite element model for the analysis of quasistatic eddy currents in a thin sheet of conducting material. The model was used for design and sensitivity analyses of a novel mechanical oscillator that consists of a shuttle mass (thin sheet of conducting material) and a set of folded spring elements. The oscillator is damped through the interaction of a static magnetic field and eddy currents in the shuttle mass. Using a prototype device and Laser Dopler Velocimetry (LDV), measurements were compared to the model in a validation study using simulation based uncertainty analyses. Measurements were found to follow the trends predicted by the model.