Piera Maresca

• Universidad Politécnica de Madrid

In the specific case of low-cost gears, and also in some general cases, the use of expensive instruments such as gear measuring machines may not be appropriated during their verification. In the scientific literature there are many works that allow the development of mathematical models capable of establishing the geometric elements of spur gears,...

The objective of this work is to develop the procedures for obtaining traceable continuous measurements (parts in movement) in computer vision systems. This work includes the calibration of the vision system (camera), recognition and processing of images and the development of measurement algorithms as well as the evaluation of the optimal measurem...

This work describes a method for the metrological characterization of structured surfaces using a confocal microscope. The proposed method is based on the calculation of texture parameters established in ISO 25178-2:2012. To ensure the traceability of these parameters, a procedure for the calibration of the Z-axis of the confocal microscope is prop...

Digital economy and Factory (Industry) 4.0 are among the main challenges in the era of Big Data Analytics. A digital transformation is required since factories and enterprises need to face quick changes in the technological process and continuous flows of massive data, in order to improve the decision making process. First, we want to investigate t...

In last years, Digital Manufacturing has taken an increasingly important role in the Industry due to the possibilities and advantages that presents. New technologies such as 3D printing in its different modalities, or laser cutting, for example, are changing the way to extend manufacturing at all levels. Knowing these techniques is very important f...

Planar kinematics is a mechanical branch that describes position, velocity and acceleration of mechanisms’ links. In order to model the 2D mechanisms Natural Coordinates have been considered. The kinematic analysis is solved when all links dimensions, and some initial values of position and velocity are known. A new method to determine kinematics’...

The term Additive Manufacturing (AM) refers to different kinds of technologies and applications that have in common the ability to build an item starting from a 3D CAD model of the component and by adding materials layer by layer until the product is realised. This paper aims at analysing the existing literature dealing with the use of Metal Additi...

Surface metrology employs various measurement techniques, among which there has been an increase of noteworthy research into non-contact optical and contact stylus methods. However, some deeper considerations about their differentiation and compatibility are still lacking and necessary. This work compares the measurement characteristics of the conf...

This work presents how the finite element methodology has been applied to analyze the mechanical behaviour of PLA parts obtained by fused deposition with a 3D printer. Three different patterns of printed layers have been studied searching for the most accurate way to model the actual response of PLA parts in a torsion test. Nine different types of...

Standard ISO 10360-7:2011 [1] establishes the principles for the acceptance and verification of coordinate measuring machines (CMMs) equipped with imaging probing systems, in order to determine the different maximum errors allowed in the measurement. By analyzing the standard, we have verified that all the potentialities that these machines present...

A comparison of the results obtained applying the traditional methodology to measure the Brinell hardness value with different optical equipment has been performed. The results show that the measurements on Brinell hardness indentation give neither satisfactory results, nor reproducibility nor precision with respect to certificated values. The fund...

Risk of human error in measurement and testing is the result of the causal combination of factors and events that are involved in the process. This paper presents how to model technical and human errors and how these could interact in order to influences the reliability of measurement/test. Human errors were designed according with a System Dynamic...

A method for analysing the effect of different hypotheses about the type of the input quantities distributions of a measurement model is presented here so that the developed algorithms can be simplified. As an example, a model of indirect measurements with optical coordinate measurement machine was employed to evaluate these different hypotheses. A...

We present a collaborative teaching model used in the practical classes of Manufacturing Engineering. This model has been developed by teachers from one of the Innovative Educational Groups “Nuevas Metodologías Docentes en Ingeniería Mecánica y de Fabricación” (New Learning Methodologies in Mechanical Engineering and Manufacturing) at Universidad P...

This paper describes a methodology which allows a commercial flatbed scanner to be transformed into a two-coordinate measuring machine which is capable of providing traceable measurements. This methodology requires an initial adjustment in order to convert the reference system of the flatbed scanner into a Cartesian reference system, thereafter cal...

This study aims to propose and describe a procedure for calibrating the “vision subsystem” of digital optical machines, based on the affine camera model, valid for telecentric optical equipment. From this procedure, it is possible to systematise the calculation of the uncertainty of the calibration parameters associated with the “vision subsystem”...

Part II of this study is essentially an experimental development of the previously-shown theoretical model. Based on the model for calibrating the “vision subsystem” developed in part I, an example of measuring and calculating uncertainties that ensures the traceability of the measurements is presented here. The Monte Carlo method is used as a tool...

This paper presents the problem of optical measuring machine calibration, emphasizing the calibration of the "optical system", omitting the calibration of the "machine system". The calibration of an optical measuring machine is the first step before using the instrument for any application. For this purpose, a mathematical model has been developed...

This paper presents a new virtual environment aimed to the realization of dimensional metrology practices, in the framework of the Degree in Mechanical Engineering of Technical University of Madrid. The development of this project allows the implementation of an interactive teaching model, focused on the student, which combines master classes and v...

The objective of this work is to analyze and compare common methods used for indirect metrological characterization of circular geometrical features: least square circle, minimum zone circle, maximum inscribed circle and minimum circumscribing circle, based on images obtained using digital optical machines. The self-developed calculation algorithms...

The purpose of this paper is to estimate the uncertainty of angle measurements using a Coordinate Measuring Machine (CMM), through the geometrical characterization of two concurrent sides of a steel angle gauge block with four perpendicular sides. For the calculation of the uncertainty associated with the measurement and investigating the errors of...

In the field of dimensional metrology, the use of optical measuring machines requires the handling of a large number of measurement points, or scanning points, taken from the image of the measurand. The presence of correlation between these measurement points has a significant influence on the uncertainty of the result. The aim of this work is the...

This paper presents the problem of optical measuring machine calibration, emphasizing the calibration of the "optical system", omitting the calibration of the "machine system". The calibration of an optical measuring machine is the first step before using the instrument for any application. For this purpose, a mathematical model has been developed...

This paper presents a new virtual environment aimed to the realization of dimensional metrology practices, in the framework of the Degree in Mechanical Engineering of Technical University of Madrid. The development of this project allows the implementation of an interactive teaching model, focused on the student, which combines master classes and v...

The purpose of this article is to show a software application made for online calibration via Internet from simple measuring instruments from the dimensional area (exterior micrometer and calliper). It also shows the educational results obtained in the teaching experiences where it has been used. The environment created makes it possible to replace...

This paper aims to analyze the different adjustment methods commonly used to characterize indirect metrology circular features: least square circle, minimum zone circle, maximum inscribed circle and minimum circumscribed circle. The analysis was performed from images obtained by digital optical machines. The calculation algorithms, self-developed,...

The aim of this work is to develop a software that allows the inspection of spur gear manufactured in the sub-millimeter range. The measurements are made using a digital optical machine and using an analysis proprietary software implemented in Matlab®, which is able to handle images, captured using the digital optical machine. The software allows t...

The purpose of this paper is to describe the objectives, methodology and structure of a virtual didactic environment developed by the educational research group New Teaching Methodologies in Mechanical Engineering and Manufacturing at the Technical University of Madrid, designed to carry out dimensional metrology practical lessons. This development...

This paper presents an optimised method for the characterization of circular features of any amplitude, which includes the capture of geometric data, by means of the use of three-coordinate measuring machine or digital optical machines with a CCD camera, and its subsequent mathematical processing. The proposed model determines the radius and the ci...

The aim of this work is to develop a mathematical model for estimating the measurement uncertainty produced when describing circular forms using the coordinates of 'n' non-collinear points obtained using optical equipment such as microscopes or profile projectors. In order to do this, we have introduced the concept of the 'dispersion matrix' into t...

RESUMEN Este trabajo prevé el planteamiento y la creación de materiales didácticos multimedia para las prácticas de metrología dimensional impartidas a alumnos de primer curso de la titulación de Ingeniero Técnico Industrial. El desarrollo de estos materiales permite definir una forma de e–learning como solución a la docencia centrada en el estudia...

The object of this paper is to outline the interactive teaching model developed by the education innovation group 'New Teaching Methodologies in Mechanical and Manufacturing Engineering Technology' of the Polytechnic University of Madrid. The aim of the model is to teach the subject of Manufacturing Engineering Technology for the Mechanical Technic...

This article describes the structure and content of educational software, developed with the aim of training engineering students in the calibration of standards and instruments in the field of dimensional metrology. The virtual character of the environment created makes it possible to substitute practising with real metrological equipment for vers...

The aim of this paper is to demonstrate an alternative method of measurement to be used in determining the minimum thickness of insulation on electrical and telecommunications conductors that are circular in section. As such, a critical analysis of the standard that is usually used in this type of measurement is undertaken and a new error-free meth...

Disponible en Web Of Science: WOS:000268186900007

Resumen Este trabajo tiene el propósito de presentar la trayectoria del Proyecto Mentor en los Grados de Ingeniería Industrial de la EUITI-UPM. En el Curso 2010-2011 se implantaron los Nuevos Títulos de Grado basados en Créditos ECTS, y de acuerdo con el Sistema Integral de Garantía de Calidad (SIGC) del centro, se comenzó con la toma de datos medi...

Resumen. Desde la implantación del Proyecto Mentor en la Escuela Universitaria de Ingeniería Técnica Industrial de Madrid (mayo 2007) se ha ido modificando la organización para mejorar la integración de los alumnos de nuevo ingreso (primer curso y Erasmus).Para alcanzar este objetivo, ha surgido la necesidad de mejorar la formación de los alumnos m...

A significant share of the total power loss in a modern automotive engine is due to the friction interaction between the upper compression ring (the "top ring") and the cylinder wall. This paper presents the results of simulations on the friction interaction top ring/cylinder wall in a SI engine taking into account the mixed lubrication (ML) regime...