Micro-rotor dynamics for micro-electro-mechanical systems (MEMS)

Dynamic modeling of a bidirectional magnetoelastic rotary micro-motor

“…The piezoelectric micro-motors described were all designed for travelling wave actuation, which eases control. More recently, nonlinear dynamics of rub-impact-actuated micro-motors have been studied via classical impact theory and dry friction models; however, to date these studies are without experimental validation [20,21]. While both piezoelectric ultrasonic and magnetoelastic motors are actuated by high frequency stator vibration, which makes contact with a rotor, the two most prominent differences are: 1) the forcing mechanism is magnetoelastic rather than piezoelectric, thus relying on in-plane magnetic fields rather than through-the-thickness electric fields, and 2) the suspended nature of the magnetoelastic stator along with the high intended payloads means that the stator motion -not just the rotor motion -is substantially affected by contact interactions.…”

Nonlinear response prediction of cracked rotor based on EMD

“…The inherently nonlinear characteristics cannot be predicted by linear models [22]. Detailed investigation into the nonlinear dynamic response prediction of a rotor with crack in the shaft is very important for diagnosing and preventing rotor cracks [11,12,16].…”

Experimental validation of impact energy model for the rub–impact assessment in a rotor system

“…Zhang et al [7] analyzed the rub-impact fault caused by geometric asymmetry between the rotor and stator, and discussed the grazing phenomenon of the single point rubbing in detail. Zhang and Meng [8][9][10][11][12][13][14][15][16] give a series of researches on the nonlinear Micro-Electro Mechanical Systems (MEMS), including stability, bifurcation and chaos. Also they do a number of detail researches on the influence of several nonlinear parameters to rotor systems.…”