A parameterized model for the impact dynamics of a piezoelectric microactuator is proposed, and a system-identification procedure for quantifying model parameters is presented. The proposed model incorporates squeeze-film damping, adhesion and coefficient-of-restitution effects. Following parameter quantification from sample data of bouncing impacts and progressive ramped-square-wave inputs, th...

Capacitive micromachined ultrasonic transducers (CMUTs) are efficient transmitters and receivers for air-coupled nondestructive evaluation applications [l]. In this paper, we present optical measurements on CMUTs with circular and rectangular membranes. Use of a laser interferometer permits accurate measurement of individual membrane displacements as well as characterization of mode shapes on t...

Objectives: The primary goal of this paper is to study the influence MHD and micropolar fluid on squeeze film lubrication between stepped porous parallel plates. Method: non-Newtonian Reynolds type equation derived by considering flow in matrix as described Darcy’s law, well microstructure additives magnetic effects associated with magnetization fluid. numerical solutions are presented graphica...

New lubrication events can be predicted using improved pathological non-Newtonian physiological fluids coupled to phospholipid-based bilayers in variable time-dependent magnetic fields under random non-steady conditions. In this study, we investigated nanofluid systems for synovial joints. The particles of PSPMA-g-HSNPs were used as nanoparticles. hydrodynamic interaction between the knee bones...

In Atomic force microscope (AFM) examination of a vibrating microcantilever, the nonlinear tip-sample interaction would greatly influence the dynamics of the cantilever. In this paper, the nonlinear dynamics and chaos of a tip-sample dynamic system being run in the tapping mode (TM) were investigated by considering the effects of hydrodynamic loading and squeeze film damping. The microcantileve...