This paper presents the influence of nonlinear terms of a previously proposed constitutive piezoelectric equation on the dynamics of a cantilever aluminium beam with a piezoelectric unimorph PZT (MIDE QP16N) attached to it. The system is subjected to different levels of base acceleration with the intention to evidence the limits of the linear model. To carry out the analysis, a one-dimensional ...

In this paper, a dynamical system, which consists of two linear mechanical oscillators, coupled with a nonlinear damping device is considered. First, the dynamic equations are derived, then, an analytical method such as harmonic balance method, is applied to obtain the response to a harmonic base excitation. The response of the system depends on the excitation characteristics. A parametric stud...

We have extended the spectral domain harmonic balance method of Withington and Kollberg [1] to handle quasiparticle mixer circuits of arbitrary complexity containing any number of superconducting tunnel junctions. Our algorithm uses a multidimensional Newton-Raphson technique to achieve rapid convergence, even when many harmonics are included in the analysis. Another improvement is to perform a...

F. Boumediene, A. Miloudi, J. M. Cadou, L. Duigou, E. H. Boutyour a Laboratoire de Mécanique Avancée, Faculté de Génie Mécanique & Génie des Procédés, USTHB, BP 32, El Alia, 16111 Bab Ezzouar, Alger, Algérie. b Laboratoire d'Ingénierie des Matériaux de Bretagne, Université Européenne de Bretagne, Université de Bretagne Sud, Rue de Saint Maudé, BP 92116, 56321 Lorient cedex, France. c Départemen...

DC speed regulating system is a complex control system with degradation and nonlinearities, and difficult to establish a precise mathematical model. The traditional control methods depend on accurate mathematical modelling of the controlled object, and it is not possible to dynamically adapt to the DC speed control system to obtain high control precision. An improved hybrid genetic algorithm fo...

RF integrated circuit designers make extensive use of simulation tools which perform nonlinear periodic steady-state analysis and its extensions. However, the computational costs of these simulation tools have restricted users from examining the detailed behavior of complete RF subsystems. Recent algorithmic developments , based on matrix-implicit iterative methods, is rapidly changing this sit...

Stroke patients with hemiparesis often exhibit an asymmetrical weight distribution, with the paretic leg providing less support and less weight-shift activity than the sound leg does. For upper-limb hemiparesis constraint-induced movement therapy (CIMT), where the sound limb is constrained and the patient is forced to use the paretic limb, has proven to be one of the most effective rehabilitati...