Optical tomography is a recent addition to the available set of computerized imaging methods available to characterize live or inanimate matter. It uses light in the optical and nearinfrared ranges and is thus particularly suited to study samples that exhibit significant variation in their optical properties in this wavelength range. This includes, for example, biological tissues as well as som...

in this paper we have discussed the main features of a finite clement program which we have developed for nonlinear dynamic analysis of plates and shells with material and geometric nonlinear behaviour. for this purpose, initially, the finite element model which we have used is briefly described. afterwards, the nonlinear viscoplastic material model in one-dimensional and multi-dimensional medi...

In this paper, the nonlinear vibration analysis of a thin cylindrical shell made of Functionally Graded Material (FGM) resting on a nonlinear viscoelastic foundation under compressive axial and lateral loads is studied. Nonlinear governing coupled partial differential equations of motions (PDEs) for cylindrical shell are derived using improved Donnell shell theory. The equations of motions (EOM...

Approximate Dynamic Inversion has been established as a method to control minimum-phase, nonaffine-incontrol systems [1]. In this report, we re-state the main results of [1], clarify some minor notational errors, and prove the same results in an expanded form. In the large, the main results of [1] still stand. The development follows [1] closely, and no novelty is claimed herein. The purpose of...

Zusammenfassung Der Beitrag beschreibt den Entwurf eines nichtlinearen Flugreglers für ein vierrotoriges unbemanntes Fluggerät,einensogenanntenQuadrocopter.Dievorgeschlagene Regelung basiert auf einer Kaskadenstruktur mit einer unterlagerten Regelschleife für die Orientierung und einer überlagerten RegelschleifefürdieGeschwindigkeit. InderinnerenRegelschleife wird das Prinzip der Linearisierung...

this study presents a new approach to control the nonlinear dynamics of an adaptive absorber using shape memory alloy (sma) element. shape memory alloys are classified as smart materials that can remember their original shape after deformation. stress and temperature-induced phase transformations are two typical behaviors of shape memory alloys. changing the stiffness associated with phase tran...

In this study, a hybrid method is proposed to investigate the nonlinear vibrations of pre- and post-buckled rectangular plates for the first time. This is an answer to an existing need to develope a fast and precise numerical model which can handle the nonlinear vibrations of buckled plates under different boundary conditions and plate shapes. The method uses the differential quadrature element...