Carlo Famoso

A New Chaotic Electro-Mechanical Oscillator

In this paper, a new electro-mechanical chaotic oscillator is presented. The system is based on the motion of the metal tip of a beam in a double-well potential generated by two magnets, and works thanks to the vibrations generated in the flexible mechanical structure by two rotating coils that produce noise-like signals. As the source of vibration is internal, the system may be considered an autonomous oscillator. Chaotic motion is experimentally observed and verified with a mathematical model of the phenomenon.

Jump Resonance in Fractional Order Circuits

In this communication, the first example of fractional order nonlinear system showing jump resonance is described, that is a system in which the order of the derivative is non-integer and whose frequency response is a multi-valued function in a given range of frequencies. Furthermore, a strategy to design fractional order systems showing jump resonance is presented along with the procedure to design and implement an analog circuit based on the approximation of the fractional order derivative. An extensive numerical analysis allows to asses that the phenomenon is robust to difference in the derivative order, enlightening the fact that a system with order lower than two is able to provide a jump resonance behavior.

Multi-jump resonance systems

ABSTRACT Multi-jump resonance indicates the behaviour of a nonlinear, non-autonomous system whose frequency response is characterised by several hysteresis regions. This paper faces the problem of the design of a nonlinear dynamical system such that it exhibits multi-jump resonance. Analytic aspects of the problem as well as electronic implementation issues of multi-jump resonance circuits are discussed, providing criteria for the design of systems with given hysteresis regions and guidelines for circuit realisation.

Sensor-Actuator matrices in distributed control systems

The results show good agreement between the signals generated both in the IPMC based sensor matrix and by the actuated coil based matrix. The peculiarity of this sensor-actuator distributed system consists of coupling two different techniques: the IPMC based one and the classical electromagnetic one. It is a reliable low cost device that can be easily extended for high number of sensor-actuator matrices. It is of course included in the class of conformable electronics and control devices. It can be used in man-machine applications and in robotics applications. Both the matrices can be layered in order to have a sensed and perceived continuous signal in 2D dimension.

A system-of-systems based equipment for thermo-mechanical testing of advanced high power modules

The integration in small packages of high power modules requires in the phase of prototype testing integrated measurements and advanced software tools to assure high level reliability of the devices. In this paper a new integrated equipment based on the concept of system-of-systems is proposed. The system-of-systems equipment is intended as a platform including several measurement instrumentations, the power supply, the control boards and the testing modules, that themselves are complex systems.

On-off sensors based on strange attractors

In this work the possibility of coupling a new class of materials with nonlinear dynamic circuits to design a new class of on-off sensors is discussed. The results that are included are preliminary and cover several applications. We consider post-silicon materials like polymers and solution-based devices to design new types of on-off sensors. The key idea is to link the variation of a quantity detected by the material to the change of a parameter of a chaotic circuit, so that to exploit the parameter sensitivity of chaotic circuits. A proof of concept is given in this work, by showing several experiments based on different types of innovative materials/devices, such as clevios, IPMC and water solution cells.

Chua's Circuit Dynamics Controlled by Using a Water Electrolytic Cell Component

In this paper, experimental results showing that the dynamics of Chuas circuit can be controlled by using water electrolytic cell based devices are reported. A Chuas circuit where one of the electrical components is replaced by an electrolytic cell device has been realized and its dynamics has been studied showing how different regimes appear when the parameters of the cell (in particular, the level of immersion of the electrode plates and the distance between them) are changed. The results obtained pave the way to the possibility of coupling nonlinear electronic components with electrochemical devices so as to develop a new hybrid technology for implementing a new class of nonlinear circuits.

Taming Chaos by Using Induced External Signals: Experimental Results

The topic of chaos control is widely studied in literature. In this paper, some new experimental results regarding an innovative strategy for taming chaos are proposed. From the experimental trends, it appears that a wide range of unstable limit cycles are extracted from chaotic electronic circuits like the Chua’s circuit and the Lorenz system.