Search results for " meccanica"

INFLUENCE OF UNCERTAINTIES ON PD TUNING

2013

The aim of this work is to present a method for tuning the parameters of PD controller under the influences of the uncertainties, in order to stabilize the position of a rotor supported by active magnetic bearings (AMBs). The uncertainties are relative to mass, transverse and polar moment of inertia of the rotor. The introduction of the uncertainties is due to an incomplete modeled dynamic of the system or in the case the system being subjected to a parametric variation. The presence of the uncertainties produces a set of differences among the values of the output. Poles displacement method is used to reach the asymptotically stability condition characterized by a periodic oscillation durin…

Il pistacchio sperimenta la meccanica

2000

Carta della viabilità e dei sentieri della Riserva Naturale Orientata Pizzo Cane, Pizzo Trigna e Grotta Mazzamuto

2012

L'elaborato rappresenta la viabilità esistente nel territorio che consente la fruizione dell'area, differenziandola in base alla percorribilità. Sono rappresentati percorsi e sentieri che consentono di raggiungere i siti di interesse difficilmente raggiungibili.

Spatially variable rate herbicide application on durum wheat in Sicily

2004

Using the conventional farming system, durum wheat requires high rates of herbicide spraying. Herbicide residues can cause pollution of soil and ground water and, therefore, of the entire environment. In order to minimise the environmental impact of herbicides, a home made system for spatially variable rate crop input application was designed, developed and set up by the Department of Engineering and Technologies in Agriculture and Forestry (I.T.A.F.). This system consists of a DGPS, a portable computer, a specifically developed software and a device for applying rates proportionally related to the machine forward speed (DPA). Tests of spatially variable rate herbicide application were carr…

Design and use of a Fatigue Test Machine in Plane Bending for Composite Specimens and Bonded Joints

2011

Polymeric and composites materials are increasingly used in industry as structural parts, so that specific information on their mechanical properties "at long term" (creep, relaxation, fatigue) are requested. The design and implementation of these components also requires that they are permanently connected together to perform certain functions. The use of adhesives in structural joints has increased over recent years thanks to the continuous development by companies which provide the market with adhesive having better and better mechanical properties. The main areas relate to the aerospace, aeronautical and automotive industries, where requirements are required for lightness and reliabilit…

TOWARD A DESIGN METHOD FOR METAL-COMPOSITE CO-CURED JOINT BASED ON THE G-SIFs

2013

Abstract In this work, a systematic study of the singular stress field in the zone where the interface intersects the free edge surfaces of bonded metal-composite co-cured joints, has been performed. The obtained theoretical, numerical and experimental results have permitted to detect the relationships between the joint configuration and the singular stress field, as well as to implement a new design method based on the so called generalised stress intensity factors. Such a proposed method allows the user to predict the static strength of a generic metal-composite co-cured joint, vs. the main influence parameters as the elastic modulus of the coupled materials, the overlap length, the taper…

Novel algorithms for 3D surface point cloud boundary detection and edge reconstruction

2019

Abstract Tessellated surfaces generated from point clouds typically show inaccurate and jagged boundaries. This can lead to tolerance errors and problems such as machine judder if the model is used for ongoing manufacturing applications. This paper introduces a novel boundary point detection algorithm and spatial FFT-based filtering approach, which together allow for direct generation of low noise tessellated surfaces from point cloud data, which are not based on pre-defined threshold values. Existing detection techniques are optimized to detect points belonging to sharp edges and creases. The new algorithm is targeted at the detection of boundary points and it is able to do this better tha…

Potatura meccanica su guyot in vigneto a controspalliera. Risultati di un biennio di sperimentazione

2009

Parametrical design of Split-Way CVTs

2016

La presente attività di ricerca si svolge presso l’Università degli Studi di Palermo nell’ambito di un corso di dottorato in Ingegneria dell’Innovazione Tecnologica, il quale si pone l’obiettivo di delineare una procedura semplice, generale e modulare per la progettazione, la modellistica ed il dimensionamento di trasmissioni meccaniche innovative, eventualmente coadiuvate da dispositivi di accumulo d’energia. In particolare, una crescente sensibilità verso le problematiche connesse all’efficienza energetica, e la conseguente ascesa dell’auto ibrida, ha fatto sì che negli ultimi anni le trasmissioni di tipo Split-way suscitassero, specie in virtù della loro capacità di consentire un certo s…

Split-Way CVTs: Parametric Analysis and Design

The thesis provides a parametric analytical method for the analysis and design of power-split continuously variable transmissions, which represent the state of the art for heavy-duty vehicles and hybrid electric cars. The functioning of any driveline is described by mean of a simple set of kinematic parameters, regardless of the constructive scheme. The calculation of the control torques remains straightforward even when both inertial effects and mechanical losses are taken into account. A simple design procedure is described and generalized in order to address any order of driveline, including multimode transmissions. The final layout is generated additively, without the need to analyze hu…