Search results for "Piezoelectric materials"

showing 7 items of 7 documents

HARVESTING DALLE PRECIPITAZIONI

2013

Settore ING-IND/31 - ElettrotecnicaEnergy harvesting piezoelectric materials PVDF
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Analysis of piezoelectric active patches performances by boundary element techniques

2008

This paper presents the analysis of active piezoelectric patches for cracked structures by Boundary Element Method. A two dimensional boundary integral formulation based on the multidomain technique is used to model cracks and to assemble the multi-layered piezoelectric patches to the host damaged structures. The fracture mechanics behavior of the repaired structures is analyzed for both perfect and imperfect interface between patches and host beams. The imperfect interface, representing the adhesive between two different layers, is modeled by using a “Spring Model” that involves linear relationships between the interface tractions, in normal and tangential directions, and the respective di…

Active Repair Piezoelectric Materials Boundary Element Method Imperfect BondingSettore ING-IND/04 - Costruzioni E Strutture Aerospaziali
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ENERGIA ELETTRICA DALLE PRECIPITAZIONI

2013

Settore ING-IND/31 - Elettrotecnicaenergy harvesting piezoelectric materials PVDF.
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A BOUNDARY ELEMENT FORMULATION FOR MICROMECHANICAL HOMOGENIZATION OF POLYCRYSTALLINE MATERIALS WITH PIEZOELECTRIC COUPLING

2019

A novel boundary element formulation for the evaluation of the effective properties of threedimensional polycrystalline aggregates with piezoelectric coupling is presented. The aggregates are modelled at the scale of their constituent crystals and are artificially generated through Voronoi-Laguerre tessellations. The electro-mechanical behaviour of each crystal is represented upon introducing an ad-hoc mesh of its boundary and a generalised integral representation of the governing equations of the piezoelectric problem. The behaviour of the whole aggregate is then retrieved upon introducing a suitable set of electro-mechanical interface conditions at the grain boundaries. With respect to cl…

Piezoelectric materials Polycrystalline materials Micromechanics Boundary Element MethodSettore ING-IND/04 - Costruzioni E Strutture Aerospaziali
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BE contact analysis of delamination cracks actively repaired trhough piezoelectric active patches

2009

Active Repair Piezoelectric Materials Boundary Element Method Delamination Cracks Friction
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Piezoelectric Rainfall Energy Harvester Performance by an Advanced Arduino-Based Measuring System

2018

This paper presents the performances of rainfall energy harvesting through the use of a piezoelectric transducer and an Arduino-based measuring system. Different studies agree on the possibility of generating electricity from rainfall, but to date, a study on measuring the quantity of energy produced during rainfall is still missing. The present study begins with results obtained from laboratory researchers using piezoelectric transducers and oscilloscopes, finalized to measure the energy produced from a single raindrop, and concludes with an ad hoc Arduino-based measuring system, aimed to measure the actual amount of electrical energy produced by a piezoelectric transducer that is exposed …

EngineeringStreRain02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciPiezoelectric materialSettore ING-INF/01 - Elettronica01 natural sciencesIndustrial and Manufacturing EngineeringAutomotive engineeringEnergy measurementpiezoelectric sensorArduino0103 physical sciencesEnergy harvesting; Energy measurement; Piezoelectric materials; piezoelectric sensor; Piezoelectric transducers; Rain; Stress; Control and Systems Engineering; Industrial and Manufacturing Engineering; Electrical and Electronic EngineeringElectrical and Electronic EngineeringOscilloscope010302 applied physicsEnergy harvestingbusiness.industryElectric potential energyElectrical engineeringPiezoelectric transducer021001 nanoscience & nanotechnologyPiezoelectricitySettore ING-IND/31 - ElettrotecnicaElectricity generationTransducerControl and Systems Engineering0210 nano-technologybusinessEnergy harvestingEnergy (signal processing)IEEE Transactions on Industry Applications
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Boundary-layer effects in wedges of piezoelectric laminates

2005

An approach to investigate boundary-layer effects in wedges of piezoelectric laminated structures is presented with the aim of ascertaining the electromechanical response characteristics. The wedge layer behavior is described in terms of generalized stress functions, which lead to a model consisting of a set of three coupled partial differential equations. The strength of the solution singularity is determined by solving the eigenvalue problem associated with the resolving system. The solution of the model is obtained by an eigenfunction expansion method coupled with a boundary collocation technique. Correspondingly, the singularity amplitude is assessed by introducing and calculating the g…

Partial differential equationMathematical analysisStress functionsEigenfunctionCondensed Matter PhysicsWedge (geometry)PiezoelectricityAtomic and Molecular Physics and OpticsBoundary layerSingularityMechanics of MaterialsSignal ProcessingPiezoelectric materials Cracks electric displacementGeneral Materials ScienceElectrical and Electronic EngineeringSettore ING-IND/04 - Costruzioni E Strutture AerospazialiStress intensity factorCivil and Structural EngineeringMathematicsSmart Materials and Structures
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