Search results for " progettazione."

Fatigue characterization of hybrid joints CFRP-aluminum obtained by Self-Pierce Riveting (SPR)

2012

Experimental evaluation of through-the-thickness stress distribution in transverse crack tension test samples

2015

Transverse Crack Tension (TCT) samples represent an alternative to End Notched Flexure configurations for the characterization of pure mode II fracture toughness of Fibre Reinforced Polymer composites. TCT is supposed to reproduce a pure Mode II failure mechanism while avoiding the frictional energy dissipation between the flanks of a starter crack. The TCT geometry is that of a unidirectional tensile sample where a number of embedded plies, centered on the middle plane, are cut in the transverse fibres direction. The tensile loading should then activate four symmetric fronts of mode II delamination from the transverse cut tips. The present work describes the implementation of two full fiel…

The Role of Patient-Specific Morphological Features of the Left Atrial Appendage on the Thromboembolic Risk Under Atrial Fibrillation

2022

BackgroundA large majority of thrombi causing ischemic complications under atrial fibrillation (AF) originate in the left atrial appendage (LAA), an anatomical structure departing from the left atrium, characterized by a large morphological variability between individuals. This work analyses the hemodynamics simulated for different patient-specific models of LAA by means of computational fluid–structure interaction studies, modeling the effect of the changes in contractility and shape resulting from AF.MethodsThree operating conditions were analyzed: sinus rhythm, acute atrial fibrillation, and chronic atrial fibrillation. These were simulated on four patient-specific LAA morphologies, each…

Studio numerico di sistemi di cementazione per inlay in composito.

2009

Nel lavoro è condotto uno studio numerico su diverse tipologie di cementazione per inlay in composito utilizzate in ambito odontoiatrico per il restauro dei denti anteriori e posteriori. Il comportamento meccanico dei diversi sistemi di cementazione è stato riprodotto numericamente mediante simulazioni FEM: infatti, la moderna tecnica odontoiatrica fa uso dei software agli elementi finiti per l’elevata versatilità ed economicità nello studio di soluzioni sempre diverse. Le simulazioni hanno permesso di prevedere lo stato tensionale e l’evoluzione di una delaminazione creata all’interfaccia bi-materiale.

OPTIMAL DAMPING CONSTANT OF THE QUARTER CAR SHOCK ABSORBER

2013

The paper aim is the investigation of optimal damping constant of a quarter car shock absorber that is performed in the frequency domain. The optimal damping constant refers to the value that minimizes the acceleration of all connected bodies characterizing a two degree of freedom system sketching a quarter car. The connected bodies are sprung and unsprung mass respectively for quarter of chassis and tire, the last one maintain the contact with the ground and it is connected with the sprung mass through a shock absorber characterized by spring and fluid damper. Optimal damping constant was determined by imposing analytical conditions on the expression of acceleration of two masses. Afterwar…

Micro-Meso Scale Models of Electrosun Poly (Ester Urethane) Urea Scaffolds.

2009

DISPOSITIVO PER RIFLETTERE LA LUCE SOLARE

2016

La presente invenzione si riferisce ad un dispositivo per riflettere la luce solare, e ad un eliostato comprendente tale dispositivo. The present invention relates to a device for reflecting the solar light, and to a heliostat comprising such a device.

NUMERICAL STUDY OF THE PHENOMENON OF “BRAKE SQUEAL” IN THE DISC BRAKES. FIRST RESULTS

2009

In this paper we consider the problem of disc brake noise, an unstable behaviour that occurs in disc brakes due to particular vibratory phenomena. The most obvious phenomenology is the product wheezing during braking. The numerous researches carried out have not yet reached satisfactory results for knowledge. There was a total of high frequency squeal, which depends only on the characteristics of the disc and not by brake complete. Finite element method is applied to achieve modal analysis; a linear model was developed noting that to eliminate or reduce the phenomena of noise brake is necessary that the ranges of calliper-disc frequencies modal do not overlap. The modal analysis of the runw…

Sviluppo di una innovativa turbina eolica urbana

2014

Il mercato energetico negli ultimi anni è stato caratterizzato dallo sviluppo di diverse tecnologie definite “rinnovabili” che permettono di ottenere energia in modo pulito e inesauribile sfruttando le diverse risorse presenti sulla terra: eolica, solare, idroelettrica e geotermica. Parallelamente allo sviluppo di grandi centrali si sono sviluppate tecnologie per la realizzazione di piccoli impianti domestici in grado di rendere energeticamente autonome le abitazioni; tra queste tecnologie quella sicuramente più diffusa sono i pannelli fotovoltaici grazie anche ai forti incentivi che questi hanno ricevuto negli ultimi anni. Tuttavia questa tecnologia non è la più efficiente se non c’è abbas…

A telescopic wind tower with reduced environmental impact - The Perima Project

2019

A prototype of a telescopic pole for wind energy production with low environmental impact and its lifting system for a 60 to 250 kW turbine and a height of 30 m have been designed and manufactured. A telescopic tower, which is raised and lowered by automation or by remote control, allows to differentiate the presence of the generator within the landscape over time. Research target: the optimal design of the telescopic coupling, the design for maintaining the preload and for the rotational decoupling, the optimization of the pairs of sleeves, the design of the pegs and the bushes of the jack-up lifting system. All the components of the wind tower have been preliminary analyzed through FEM st…