The present paper reports the outcomes of activities concerning a real-time SHM system for debonding flaw detection based on ground testing an aircraft structural component as basis condition-based maintenance. In this application, damage method unrelated to or load models is investigated. reported applied two flaws, kissing bond type, artificially deployed over full-scale composite spar under action external bending loads. proposed algorithm, local high-edge onset (LHEO), detects edge in...

Aircraft wings are usually optimized for a specific design point. However, since they operate in wide variety of flight regimes, some these have conflicting impacts on aircraft process, as single configuration may be efficient one instance but perform poorly others. In principle, stiff, hardly deformable structures preclude any adaptation to changing conditions. Alternatively, morphing could provide adaptive capabilities maximize performance operation.

In this paper, we present a finite element formulation for vibration reduction in structural-acoustic systems using passive or semipassive shunt techniques. The coupled system consists of an elastic structure (with surface-mounted piezoelectric patches) filled with inviscid linear acoustic fluid. An appropriate is derived. Numerical results plate to parallelipedic air-filled interior cavity are presented, showing the performances both inductive and synchronized switch

Innovative graphene-based sensors are produced through the spray deposition of multilayer graphene suspension in 1-propanol. They cost effective and suitable for large-scale integration aeronautical-grade composite structures. The piezoresistive characteristic new sensor has been assessed static, quasi-static, dynamic tests. obtained results show that detecting strains any directions due to isotropic material. Moreover, potentiality proposed situ non-destructive investigations...

Structural health monitoring has multifold aims. Concerning composite structures, the main objectives are perhaps reducing costs by shifting from scheduled to on-demand maintenance and weight removing redundant precautions as insertion of chicken fasteners for ensuring joint safety in cases bonding layer fail. Adhesion defects may be classified along different types, instance distinguishing between glue deficiency or de-bonding. This paper deals with a preliminary numerical characterization...

Nowadays, smart composites based on different nano-scale carbon fillers, such as nanotubes (CNTs), are increasingly being thought of a more possible alternative solution to conventional materials, mainly for their improved electrical properties. Great attention is given by the research community in designing highly sensitive strain sensors and ambitious challenges: context, interest fields related have seen extraordinary development recent years. The authors aim provide most contemporary...

This detailed study proposes a structural health monitoring system which enables the identification, localisation, and correct measurement analysis, in relation to damage debonding induced by low energy impacts within aircraft composite wing panels. The said has been envisaged as an offline aims be considered valid alternative method current first two maintenance approach levels: visual inspection, is followed if necessary ultrasonic scanning techniques. architecture includes different...

The high sensitivity of composite materials to in service accidental damage and manufacturing imperfections can often lead oversized components design expensive maintenance approaches. possibility trust on a reliable onboard structural health usage monitoring system (HUMS), able real-time detect damage, comparable or even smaller than the one currently assumed for certification, could improve, generally speaking, strength simplify philosophy. This paper resumes results achieved by...

Statistical approaches have been extensively used to detect structural damage. This article proposes a preliminary investigation on the use of non-model-based damage identification method, implementing “dispersion feature” indicators, extracted from differential strain signal. In detail, method takes advantage elaboration full-spectrum acquisition, irrespective healthy state structure under test. Large variations some selected statistical features, representative acquired signals, are taken...

Abstract Winglets are introduced into modern aircraft to reduce wing aerodynamic drag and consequently optimize the fuel burn per mission. In order be aerodynamically effective, these devices installed at tip section; this region is generally characterized by relevant oscillations induced flights maneuvers gust. The present work focused on validation of a continuous monitoring system based fiber Bragg grating sensors frequency domain analysis detect physical condition skin-spar bonding...

In recent years, there has been a significant increase in the use of structural health monitoring (SHM) technologies as systems for integrity aircraft’s structures. The compact and embeddable sensor networks, like ones based on fibre optics (FO), is particularly attractive from perspective releasing an integrated system with intrinsic sensing capacity. Usually, SHM architecture completed by dedicated algorithm that processes data gathered sensors to elaborate level damage currently suffered...

An original Monito-Ring system based on chirped fiber optic and draw tower grating array is presented. The target of this research activity the realization a device able to measure deformations morphing structures which may show large, global displacements due nonstandard architectures materials adopted. occurring strain field results, in turns, much more than standard sensors can handle. Modulations are then necessary keep measured low. proposed solution was conceived overcome limitation...

Today, as railways increase their capacity and speeds, it is more important than ever to be completely aware of the state vehicles fleet's condition ensure highest quality safety standards, well being able maintain costs low possible. Operation a modern, dynamic efficient railway demands real time, accurate reliable evaluation infrastructure assets, including signal networks diagnostic systems acquire functional parameters. In conventional system, measurement data are reliably collected...

This paper focuses on the development and demonstration of a novel blade morphing system within whirl tower facility. The scope is to investigate behavior proposed architecture under representative loads, demonstrating its capability alter original shape in operation centrifugal, aerodynamic, internal forces. concept was developed inside European project “Shape Adaptive Blades for Rotorcraft Efficiency”, SABRE, consists memory alloy able change twist law and, this way, enhance rotor...

This article deals with the modeling of a strain-displacement transducer conceived for extending FBG measurement range. The intrinsic fragility optical fiber limits their application to cases characterized by relatively small deformations. To extend employ large displacement field (i.e. morphing applications), dedicated device was conceived, constituted circular ring connected structure and laterally integrated sensor. mathematically modeled minimizing potential energy this way arriving at...

The object of this work is the conceptual design and modelling a transducer based on fibre optic sensor conceived to measure rotations rigid components around pivot. device, namely, post-buckling-fibre Bragg grating, constituted flexible metal plate hosting grating strain sensor; edges plates are hinged onto rotating bodies, eccentrically with respect In way, any increase in rotation produces further bending corresponding wavelength shift. Among different applications, an aileron morphing...

The work at hand focuses on an adaptive system aimed improving the soundproof performance of car door seals specific regimes (cruise), without interfering with conventional opening and closing operations. idea addresses necessity increasing seal effectiveness, jeopardized by aerodynamic actions that strengthen as speed increases, generating a growing pressure difference between internal external field in direction door, then deteriorating acoustic insulation. An original expansion mechanism...