New Advances in Space SHM Project
Journal Title: INCAS BULLETIN - Year 2015, Vol 7, Issue 1
Abstract
This paper is based on a consistent family of experimental data obtained in a national research project. More accurate, specimens representing spacecraft structures, accomplished from aluminum circular plates with PWAS bonded on them were subjected to extreme temperature variations and radiations, both specific to space applications. The structure itself is affected by mechanical damages caused by fatigue and aging. These mechanical damages were simulated by laser fabricated slit cuts. The signature of structure’s health is seen as the real part of electromechanical impedance (EMI) curves of a PWAS bonded on structure. Whatever the EMI signature (recorded via special devices) changes, it is important that it be signaled online. It is shown that a neural network (NN) has the willingness to “learn”, thus identifying a function more or less complicated, as it is the case with the real part of EMI characteristic. In view of NN preparation for in-situ installing, at least the following aspects must be elucidated: setting the number of iterations to learning; evaluation of common damages that can appear in the structure; investigations on their evolution time; investigations on the possible values of learning errors; the default value of error to stop the learning process.
Authors and Affiliations
TOADER Adrian , URSU Ioan , ENCIU Daniela
Keywords
Related Articles
- EP ID EP111129
- DOI 10.13111/2066-8201.2015.7.1.7
- Views 104
- Downloads 0
New Urban Vertical Axis Wind Turbine Design
This paper develops a different approach for enhancing the performance of Vertical Axis Wind Turbines for the use in the urban or rural environment and remote isolated residential areas. Recently the vertical axis wind t...
REVLANSYS: Mission and GNC Design of Terminal Entry and Landing Missions for Advanced Re-Entry Vehicles
The ESA REVLANSYS study aims to develop key technologies in the field of Mission Engineering and GNC for autonomous re-entry vehicles, and to derive coherent mission, system and GNC requirements for the specific terminal...
Common aspects and differences in the behaviour of classical configuration versus canard configuration aircraft in the presence of vertical gusts, assuming the hypothesis of an elastic fuselage
The paper analyzes, in parallel, common aspects and differences in the behavior of classical configuration versus canard configuration aircraft in the presence of vertical gusts, assuming the hypothesis of an elastic fus...
GNSS Navigation Threats Management on-Board of Aircraft
This paper proposes low-complexity measures to be deployed on most aircraft to enable the management of Global Navigation Satellite Systems (GNSS) interference, and in particularly of jamming and spoofing threats, in ord...
Comprehensive study of endurance for IAR-99 Hawk
The paper presents some methods of on-ground and in-flight calibration for strain gauges, intended to the development of complex programs which analyze the endurance phenomena for aerospace structures, with direct applic...