Nazih Mechbal

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This document provides a method for on-board monitoring and on-ground diagnosis of a hydromechanical actuation loop such as those found in aircraft engines. First, a complete system analysis is performed to understand its behaviour and determine the main degradation modes. Then, system health indicators are defined and a method for their real time on-board(More)
This paper describes the application of proper orthogonal decomposition (POD) method in the context of structural health monitoring of a smart structure, bonded with a distributed piezoceramic patches array. Using measurements given by the distributed sensors, we propose a damage index (DI) based on change in angle between subspaces. Furthermore, from(More)
Inflatable structures are already used in robotics to build stiff and light inflatable links. Moreover, those links are compliant and they can be safely used in robots interacting with critical installations. Nevertheless, until now, linkages with an inflatable structure have always been composed of independent inflatable links separated by joints. But the(More)
To increase the dependability of complex systems, one solution is to assess their state of health continuously through the monitoring of variables sensitive to potential degradation modes. When computed in an operating environment, these variables, known as health indicators, are subject to many uncertainties. Hence, the stochastic nature of health(More)
This paper deals with a finite element evaluation of new kind of robotic arm based on a complete inflatable structure. Soft robotics and particularly inflatable robotics are now considered as a credible alternative to classical structures for a wide field of robotics. As they are made of textile materials, inflatable robots allow compact packaging and(More)
Structural damages can result in nonlinear dynamical signatures that can significantly enhance their detection. An original nonlinear damage detection approach is proposed that is based on a cascade of Hammerstein models modelisation of the structure. This model is estimated by means of the Exponential Sine Sweep Method from only one measurement. On the(More)
Structural damages can result in nonlinear dynamical responses. Thus, estimating the nonlinearities generated by damages potentially allows detecting them. In this paper, an original approach called the ES2D (Exponential Sine Sweep Damage Detection) is proposed for nonlinear damage detection. This approach is based on a damage index that reflects the ratio(More)