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Papers by Arcangelo Pellegrino

Research paper thumbnail of ‘Prototipo di Sezione Alare Adattiva per UAV: Centina Deformabile con Attuatori in SMA

Control of aerodynamic forces in conventional wings is provided by mean of hinged aerodynamic dev... more Control of aerodynamic forces in conventional wings is provided by mean of hinged aerodynamic devices that induce discontinuities in the wing surface and, consequently, a loss of wing efficiency. The ideal would be to obtain gap free modifications of the wing shape to control aerodynamic forces without a price to pay in terms of efficiency. This paper introduces the concept

Research paper thumbnail of Using Virtual Prototyping and Rapid Prototyping to evaluate, for industrial benchmarking, Pedestrian Safety performances of the front part of a vehicle

All over the world, and mainly in United States [10], since 1977 to 1991 the research centers of ... more All over the world, and mainly in United States [10], since 1977 to 1991 the research centers of the main automotive companies had processed several statistical data on real accidents between vehicles and pedestrians taking care, obviously, to pedestrians' injury . In latest years a research group of EEVC (European Enhanced Vehicle Safety Committee) had examined the statistic works of past twenty years and subsequent several scientific papers, and had realized some documents about "pedestrian test" procedures [2,6,7]. In reference papers of period 1977 -1997 and in EEVC documents, the scientists describe a proposed homologative test for child-head impact; an impact simulation of a standardized impactor on car bonnet represents it, in order to evaluate the child-head injury as deceleration of its center of gravity . Injury evaluation criteria is an energy criterion and is quantified by the HPC index (Head Performance Criteria also called, without distinction, HIC -Head Injury Criteria) defined as follows:

Research paper thumbnail of Spinal FEM analyses based on parametric CAD model of vertebra

The use of structural FEM analysis in orthopedics and vertebral traumatology is particularly usef... more The use of structural FEM analysis in orthopedics and vertebral traumatology is particularly useful for prosthesis design activities and for the study of natural phenomenon hardly analyzable with traditional methods such as, for instance, the behavior in presence of fractures or electromagnetic fields. Models actually used for simulations regarding vertebral column are essentially distinguished in two typologies: strongly customized models obtained with diagnostic imaging of one or several couples of vertebrae; strongly simplified and poorly customized models, constituting whole vertebral groups. Strongly customized models have wide application in simulations of a single couple of vertebrae; the results of these simulations, also being strongly customized, are generalized through qualitative considerations of several individuals Simplified models are widely used for simulation of the whole column or vertebral groups and turn out to be particularly useful for ergonomic analyses and the study of traumatic events. Limits of models obtained by diagnostic imaging, besides the high quality of the results, are the need to handle a huge amount of data for reconstruction and accordingly high implementation and execution time. Despite the past experience, also allowing global analysis of the spine in reasonably short times, simplified models have the limit to add geometrical approximation to the numerical analysis, leading to less accurate results. The use of simulations of FEM models, originated from a CAD model of the column which is morphologically comparable to the real column and flexible to every human being, leads to a drastic reduction of time due to the easy customization and to a wide ranging of results. The introduction of a parametric model of the vertebral column represents an excellent compromise between the anatomic adhesion of models obtained with diagnostic imaging and the flexibility of simplified ones. This model is functional both in specific analysis related to the single couples of vertebrae and in analysis of the whole column or vertebral groups, in both cases keeping a discrete accuracy of the result. The article illustrates the comparison, in terms of static strain reactions, between a model of a spine obtained with reverse engineering techniques and the corresponding parametric variational model set up for the same individual. The comparison has been realized using, in a FEM implicit code, models with the same characterization of articulations and vertebra and similar boundary conditions.

Research paper thumbnail of PARAMETRIC MODEL OF LUMBAR VERTEBRA

The present work proposes the realization of a parametric/variational CAD model of a normotype lu... more The present work proposes the realization of a parametric/variational CAD model of a normotype lumbar vertebra, which could be used for improving the effectiveness of actual imaging techniques in informational augmentation of the orthopaedic and traumatological diagnosis. In addition it could be used for ergonomic static and dynamical analysis of the lumbar region and vertebral column.

Research paper thumbnail of Unit operations on single levitated particles

An electrodynamic balance used as a tool for unit operations on single sub-millimeter particles i... more An electrodynamic balance used as a tool for unit operations on single sub-millimeter particles is described. Fine control of the particle position is designed and realized using either fuzzy logic concepts or traditional PID schemes. Precision and efficacy of the two methods are compared. A simple application to the drying of a droplet is shown

Research paper thumbnail of Measure of independence in soft design

Journal of Materials Processing Technology, 2002

ABSTRACT

Research paper thumbnail of Application of non-probabilistic information

Journal of Materials Processing Technology, 2004

In this paper we analyse the applications of MaxInf Principle in a real problem of optimisation o... more In this paper we analyse the applications of MaxInf Principle in a real problem of optimisation of a typical industrial manufacturing. After we reminded the theory of information we examine an example where is possible to determine a polynomial equation that approximates a set of value with a constant deviation that represents the same error for every point or the same information.

Research paper thumbnail of ‘Prototipo di Sezione Alare Adattiva per UAV: Centina Deformabile con Attuatori in SMA

Control of aerodynamic forces in conventional wings is provided by mean of hinged aerodynamic dev... more Control of aerodynamic forces in conventional wings is provided by mean of hinged aerodynamic devices that induce discontinuities in the wing surface and, consequently, a loss of wing efficiency. The ideal would be to obtain gap free modifications of the wing shape to control aerodynamic forces without a price to pay in terms of efficiency. This paper introduces the concept

Research paper thumbnail of Using Virtual Prototyping and Rapid Prototyping to evaluate, for industrial benchmarking, Pedestrian Safety performances of the front part of a vehicle

All over the world, and mainly in United States [10], since 1977 to 1991 the research centers of ... more All over the world, and mainly in United States [10], since 1977 to 1991 the research centers of the main automotive companies had processed several statistical data on real accidents between vehicles and pedestrians taking care, obviously, to pedestrians' injury . In latest years a research group of EEVC (European Enhanced Vehicle Safety Committee) had examined the statistic works of past twenty years and subsequent several scientific papers, and had realized some documents about "pedestrian test" procedures [2,6,7]. In reference papers of period 1977 -1997 and in EEVC documents, the scientists describe a proposed homologative test for child-head impact; an impact simulation of a standardized impactor on car bonnet represents it, in order to evaluate the child-head injury as deceleration of its center of gravity . Injury evaluation criteria is an energy criterion and is quantified by the HPC index (Head Performance Criteria also called, without distinction, HIC -Head Injury Criteria) defined as follows:

Research paper thumbnail of Spinal FEM analyses based on parametric CAD model of vertebra

The use of structural FEM analysis in orthopedics and vertebral traumatology is particularly usef... more The use of structural FEM analysis in orthopedics and vertebral traumatology is particularly useful for prosthesis design activities and for the study of natural phenomenon hardly analyzable with traditional methods such as, for instance, the behavior in presence of fractures or electromagnetic fields. Models actually used for simulations regarding vertebral column are essentially distinguished in two typologies: strongly customized models obtained with diagnostic imaging of one or several couples of vertebrae; strongly simplified and poorly customized models, constituting whole vertebral groups. Strongly customized models have wide application in simulations of a single couple of vertebrae; the results of these simulations, also being strongly customized, are generalized through qualitative considerations of several individuals Simplified models are widely used for simulation of the whole column or vertebral groups and turn out to be particularly useful for ergonomic analyses and the study of traumatic events. Limits of models obtained by diagnostic imaging, besides the high quality of the results, are the need to handle a huge amount of data for reconstruction and accordingly high implementation and execution time. Despite the past experience, also allowing global analysis of the spine in reasonably short times, simplified models have the limit to add geometrical approximation to the numerical analysis, leading to less accurate results. The use of simulations of FEM models, originated from a CAD model of the column which is morphologically comparable to the real column and flexible to every human being, leads to a drastic reduction of time due to the easy customization and to a wide ranging of results. The introduction of a parametric model of the vertebral column represents an excellent compromise between the anatomic adhesion of models obtained with diagnostic imaging and the flexibility of simplified ones. This model is functional both in specific analysis related to the single couples of vertebrae and in analysis of the whole column or vertebral groups, in both cases keeping a discrete accuracy of the result. The article illustrates the comparison, in terms of static strain reactions, between a model of a spine obtained with reverse engineering techniques and the corresponding parametric variational model set up for the same individual. The comparison has been realized using, in a FEM implicit code, models with the same characterization of articulations and vertebra and similar boundary conditions.

Research paper thumbnail of PARAMETRIC MODEL OF LUMBAR VERTEBRA

The present work proposes the realization of a parametric/variational CAD model of a normotype lu... more The present work proposes the realization of a parametric/variational CAD model of a normotype lumbar vertebra, which could be used for improving the effectiveness of actual imaging techniques in informational augmentation of the orthopaedic and traumatological diagnosis. In addition it could be used for ergonomic static and dynamical analysis of the lumbar region and vertebral column.

Research paper thumbnail of Unit operations on single levitated particles

An electrodynamic balance used as a tool for unit operations on single sub-millimeter particles i... more An electrodynamic balance used as a tool for unit operations on single sub-millimeter particles is described. Fine control of the particle position is designed and realized using either fuzzy logic concepts or traditional PID schemes. Precision and efficacy of the two methods are compared. A simple application to the drying of a droplet is shown

Research paper thumbnail of Measure of independence in soft design

Journal of Materials Processing Technology, 2002

ABSTRACT

Research paper thumbnail of Application of non-probabilistic information

Journal of Materials Processing Technology, 2004

In this paper we analyse the applications of MaxInf Principle in a real problem of optimisation o... more In this paper we analyse the applications of MaxInf Principle in a real problem of optimisation of a typical industrial manufacturing. After we reminded the theory of information we examine an example where is possible to determine a polynomial equation that approximates a set of value with a constant deviation that represents the same error for every point or the same information.