P. Maresca - Academia.edu (original) (raw)

Papers by P. Maresca

Research paper thumbnail of PGDnet: plataforma de gestión docente a través de Internet. Una herramienta activa de aprendizaje en ingeniería mecánica y fabricación

e-spacio.uned.es

... de innovación educativa “Nuevas metodologías docentes en ingeniería mecánica y fabricación” D... more ... de innovación educativa “Nuevas metodologías docentes en ingeniería mecánica y fabricación” Departamento de Mecánica Industrial – Universidad Politécnica de Madrid Ronda de Valencia, 3 – 28012 Madrid – España RESUMEN PGDnet es una plataforma de gestión ...

Research paper thumbnail of Optical measuring equipments. Part I: Calibration model and uncertainty estimation

Precision Engineering, 2015

Research paper thumbnail of Optical measuring equipments. Part II: Measurement traceability and experimental study

Precision Engineering, 2015

ABSTRACT

Research paper thumbnail of Alternative method for the metrological characterization of spur gears in the sub-millimeter range using optical equipment

ABSTRACT The aim of this work is to develop a software that allows the inspection of spur gear ma... more ABSTRACT 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 to evaluate the profile and pitch deviations as establish in the ISO/TR 10064-1:1992 standard [1].

Research paper thumbnail of Development of a Calibration Model for Optical Measuring Machines

Procedia Engineering, 2013

This paper presents the problem of optical measuring machine calibration, emphasizing the calibra... more 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 to transform the coordinates of a point in space (3D) into coordinates of a point in an image (2D). Using this camera model, a calibration procedure has been developed using a grid distortion pattern. Finally, a procedure for calculating the uncertainty of the camera and geometric distortion parameters based on the Monte Carlo method has been developed.

Research paper thumbnail of Virtual Environment for the Simulation of a Horizontal Coordinate Measuring Machine in the Teaching of Dimensional Metrology

Procedia Engineering, 2013

This paper presents a new virtual environment aimed to the realization of dimensional metrology p... more 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 virtual applications, in an environment known as DE-learning (driven e-learning). This teaching tool directs and helps students on an individual way in the dynamic and interactive practice development. In particular, this module simulates the functioning, calibration and measurements using a horizontal coordinate measuring machine (HCMM). The program interface has been developed trying to create an easy-to-use environment for the students, in order to be a first contact with the HCMM and its possible metrological applications.

Research paper thumbnail of Metrological characterization of interior circular features using digital optical machines: Calculation models and application scope

Precision Engineering, 2014

ABSTRACT The objective of this work is to analyze and compare common methods used for indirect me... more ABSTRACT 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 used were implemented with Matlab® software considering the following study variables: the amplitude of the angular sector of the circular feature, its nominal radius and the magnification used by the optical machine. Under different measuring conditions the radius and roundness error of an angular sector of a piece of LEGO and of a ring gauge were determined. That is, the proposed algorithms allow the characterization of both full circumferences as angular sectors. We were able to determine the degree of precision of each method and its scope of application by comparing the results obtained with different adjustments to values certified by an accredited laboratory.

Research paper thumbnail of Optimization of the method for measuring the insulation of circular section electrical and telecommunication conductors

Measurement Science and Technology, 2007

The aim of this paper is to demonstrate an alternative method of measurement to be used in determ... more 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 methodology is proposed. The

Research paper thumbnail of Uncertainty in ellipse fitting using a flatbed scanner: development and experimental verification

Measurement Science and Technology, 2014

ABSTRACT In the field of dimensional metrology, the use of optical measuring machines requires th... more ABSTRACT 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 development of an estimation procedure for the uncertainty of measurement in a geometrically elliptical shape, taking into account the correlation between the scanning points. These points are obtained from an image produced using a commercial flat bed scanner. The characteristic parameters of the ellipse (coordinates of the center, semi-axes and the angle of the semi-major axis with regard to the horizontal) are determined using a least squares fit and orthogonal distance regression. The uncertainty is estimated using the information from the auto-correlation function of the residuals and is propagated through the fitting algorithm according to the rules described in Evaluation of Measurement Data—Supplement 2 to the ‘Guide to the Expression of Uncertainty in Measurement’—Extension to any number of output quantities. By introducing the concept of cut-off length, it can be observed how it is possible to take into account the presence of the correlation in the estimation of uncertainty in a very simple way while avoiding underestimation.

Research paper thumbnail of Use of coordinate measuring machines and digital optical machines for the geometric characterization of circumference arcs using the minimum zone method

Measurement, 2010

This paper presents an optimised method for the characterization of circular features of any ampl... more 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 circularity error, based on the minimum zone method, and to this end it uses linear programming techniques, the Simplex programming principles and the limaçon approximation. An experimental study on ring gauges and reference disks is provided, including a comparative analysis using the Chauvenet and Grubbs filtering procedures. Last of all, an uncertainty estimation method is proposed by means of the Monte Carlo simulation. The experimental analysis carried out on ring gauges and reference disks accredit that the algorithm developed, implemented in a Matlab Ò environment, gives reliable results for any circumference arc considered, regardless of its amplitude.

Research paper thumbnail of Use of coordinate measuring machine to measure angles by geometric characterization of perpendicular planes. Estimating uncertainty

Measurement, 2014

ABSTRACT The purpose of this paper is to estimate the uncertainty of angle measurements using a C... more ABSTRACT 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 the CMM associated with orientation and length in the work volume, two models: linear statistical model behavior of CMM and the Mitutoyo model behavior are used and compared. After having established two behavioral models for the CMM we have determined the values of the angles and their uncertainty by using Monte Carlo Method. The results show that the proposed methods are suitable to investigate CMM hardware performance and determine the contribution of machine variables to measurement uncertainty. We can affirm that the statistical model behavior is more immediate and less laborious in terms of calculation and implementation time than the Mitutoyo model.

Research paper thumbnail of Interactive dimensional calibration via Internet

Computer Applications in Engineering Education, 2013

ABSTRACT The purpose of this article is to show a software application made for online calibratio... more ABSTRACT 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 real practices with virtual simulations where the student must make the proper metrological decisions and make the necessary calculations to determine the instruments' expanded uncertainty. This software has shown to be a very useful and efficient tool in training the distance learning students in the course titled: “Calibration Plan for Ensuring Quality in Industrial Laboratories,” offered by Technical University of Madrid. Furthermore, some very notable academic results have been achieved among students from two pilot groups for the Mechanical Engineering degree program. Comput Appl Eng Educ © 2010 Wiley Periodicals, Inc.

Research paper thumbnail of Developing a new interactive simulation environment with Macromedia Director for teaching applied dimensional metrology

The purpose of this paper is to describe the objectives, methodology and structure of a virtual d... more 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 has allowed teaching to be focused on the student in a DE-learning (driven electronic learning) environment capable of efficiently replacing the traditional method based on master classes and practical hands-on experience with real equipment. In fact, the developed environment directs and assists students, step by step, in their practical experience, proving dynamic and interactive through the use of animations, video and audio contributions, connections with hypertexts and simulations. The model presented in this work seeks a progressive adaptation to the new training paradigms, incorporating emerging communication technologies so that students can harness an even greater role that has hitherto been untapped, hence approaching one of the objectives in the Bologna process. The project has been undertaken entirely with the software house Macromedia: Director MX 2004 and Flash MX 2004, which has afforded the creation of a multimedia application with animations of the highest quality. Scripting languages (Lingo, JavaScript and ActionScript) have likewise been incorporated, permitting the evolution of even more complex elements for user interaction. The project has been undertaken in Spanish and English with a view to meeting the communication needs of students in a multicultural environment, in harmony with the framework program for didactic strategies in the European Higher Education Area.

Research paper thumbnail of A proposal for the metrological characterization of circular features with digital optical machines

ABSTRACT This paper aims to analyze the different adjustment methods commonly used to characteriz... more ABSTRACT 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, have been implemented in Matlab® and take into consideration as study variables: the amplitude of angular sector of the circular feature, its nominal radio and the magnification used by the optical machine. Under different conditions, it was determined the radius and circularity error of different circular standards. The comparison of the results, obtained by the different methods of adjustments used, with certified values for the standards, has allowed us to determine the accuracy of each method and its scope.

Research paper thumbnail of PGDnet: plataforma de gestión docente a través de Internet. Una herramienta activa de aprendizaje en ingeniería mecánica y fabricación

e-spacio.uned.es

... de innovación educativa “Nuevas metodologías docentes en ingeniería mecánica y fabricación” D... more ... de innovación educativa “Nuevas metodologías docentes en ingeniería mecánica y fabricación” Departamento de Mecánica Industrial – Universidad Politécnica de Madrid Ronda de Valencia, 3 – 28012 Madrid – España RESUMEN PGDnet es una plataforma de gestión ...

Research paper thumbnail of Optical measuring equipments. Part I: Calibration model and uncertainty estimation

Precision Engineering, 2015

Research paper thumbnail of Optical measuring equipments. Part II: Measurement traceability and experimental study

Precision Engineering, 2015

ABSTRACT

Research paper thumbnail of Alternative method for the metrological characterization of spur gears in the sub-millimeter range using optical equipment

ABSTRACT The aim of this work is to develop a software that allows the inspection of spur gear ma... more ABSTRACT 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 to evaluate the profile and pitch deviations as establish in the ISO/TR 10064-1:1992 standard [1].

Research paper thumbnail of Development of a Calibration Model for Optical Measuring Machines

Procedia Engineering, 2013

This paper presents the problem of optical measuring machine calibration, emphasizing the calibra... more 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 to transform the coordinates of a point in space (3D) into coordinates of a point in an image (2D). Using this camera model, a calibration procedure has been developed using a grid distortion pattern. Finally, a procedure for calculating the uncertainty of the camera and geometric distortion parameters based on the Monte Carlo method has been developed.

Research paper thumbnail of Virtual Environment for the Simulation of a Horizontal Coordinate Measuring Machine in the Teaching of Dimensional Metrology

Procedia Engineering, 2013

This paper presents a new virtual environment aimed to the realization of dimensional metrology p... more 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 virtual applications, in an environment known as DE-learning (driven e-learning). This teaching tool directs and helps students on an individual way in the dynamic and interactive practice development. In particular, this module simulates the functioning, calibration and measurements using a horizontal coordinate measuring machine (HCMM). The program interface has been developed trying to create an easy-to-use environment for the students, in order to be a first contact with the HCMM and its possible metrological applications.

Research paper thumbnail of Metrological characterization of interior circular features using digital optical machines: Calculation models and application scope

Precision Engineering, 2014

ABSTRACT The objective of this work is to analyze and compare common methods used for indirect me... more ABSTRACT 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 used were implemented with Matlab® software considering the following study variables: the amplitude of the angular sector of the circular feature, its nominal radius and the magnification used by the optical machine. Under different measuring conditions the radius and roundness error of an angular sector of a piece of LEGO and of a ring gauge were determined. That is, the proposed algorithms allow the characterization of both full circumferences as angular sectors. We were able to determine the degree of precision of each method and its scope of application by comparing the results obtained with different adjustments to values certified by an accredited laboratory.

Research paper thumbnail of Optimization of the method for measuring the insulation of circular section electrical and telecommunication conductors

Measurement Science and Technology, 2007

The aim of this paper is to demonstrate an alternative method of measurement to be used in determ... more 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 methodology is proposed. The

Research paper thumbnail of Uncertainty in ellipse fitting using a flatbed scanner: development and experimental verification

Measurement Science and Technology, 2014

ABSTRACT In the field of dimensional metrology, the use of optical measuring machines requires th... more ABSTRACT 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 development of an estimation procedure for the uncertainty of measurement in a geometrically elliptical shape, taking into account the correlation between the scanning points. These points are obtained from an image produced using a commercial flat bed scanner. The characteristic parameters of the ellipse (coordinates of the center, semi-axes and the angle of the semi-major axis with regard to the horizontal) are determined using a least squares fit and orthogonal distance regression. The uncertainty is estimated using the information from the auto-correlation function of the residuals and is propagated through the fitting algorithm according to the rules described in Evaluation of Measurement Data—Supplement 2 to the ‘Guide to the Expression of Uncertainty in Measurement’—Extension to any number of output quantities. By introducing the concept of cut-off length, it can be observed how it is possible to take into account the presence of the correlation in the estimation of uncertainty in a very simple way while avoiding underestimation.

Research paper thumbnail of Use of coordinate measuring machines and digital optical machines for the geometric characterization of circumference arcs using the minimum zone method

Measurement, 2010

This paper presents an optimised method for the characterization of circular features of any ampl... more 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 circularity error, based on the minimum zone method, and to this end it uses linear programming techniques, the Simplex programming principles and the limaçon approximation. An experimental study on ring gauges and reference disks is provided, including a comparative analysis using the Chauvenet and Grubbs filtering procedures. Last of all, an uncertainty estimation method is proposed by means of the Monte Carlo simulation. The experimental analysis carried out on ring gauges and reference disks accredit that the algorithm developed, implemented in a Matlab Ò environment, gives reliable results for any circumference arc considered, regardless of its amplitude.

Research paper thumbnail of Use of coordinate measuring machine to measure angles by geometric characterization of perpendicular planes. Estimating uncertainty

Measurement, 2014

ABSTRACT The purpose of this paper is to estimate the uncertainty of angle measurements using a C... more ABSTRACT 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 the CMM associated with orientation and length in the work volume, two models: linear statistical model behavior of CMM and the Mitutoyo model behavior are used and compared. After having established two behavioral models for the CMM we have determined the values of the angles and their uncertainty by using Monte Carlo Method. The results show that the proposed methods are suitable to investigate CMM hardware performance and determine the contribution of machine variables to measurement uncertainty. We can affirm that the statistical model behavior is more immediate and less laborious in terms of calculation and implementation time than the Mitutoyo model.

Research paper thumbnail of Interactive dimensional calibration via Internet

Computer Applications in Engineering Education, 2013

ABSTRACT The purpose of this article is to show a software application made for online calibratio... more ABSTRACT 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 real practices with virtual simulations where the student must make the proper metrological decisions and make the necessary calculations to determine the instruments' expanded uncertainty. This software has shown to be a very useful and efficient tool in training the distance learning students in the course titled: “Calibration Plan for Ensuring Quality in Industrial Laboratories,” offered by Technical University of Madrid. Furthermore, some very notable academic results have been achieved among students from two pilot groups for the Mechanical Engineering degree program. Comput Appl Eng Educ © 2010 Wiley Periodicals, Inc.

Research paper thumbnail of Developing a new interactive simulation environment with Macromedia Director for teaching applied dimensional metrology

The purpose of this paper is to describe the objectives, methodology and structure of a virtual d... more 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 has allowed teaching to be focused on the student in a DE-learning (driven electronic learning) environment capable of efficiently replacing the traditional method based on master classes and practical hands-on experience with real equipment. In fact, the developed environment directs and assists students, step by step, in their practical experience, proving dynamic and interactive through the use of animations, video and audio contributions, connections with hypertexts and simulations. The model presented in this work seeks a progressive adaptation to the new training paradigms, incorporating emerging communication technologies so that students can harness an even greater role that has hitherto been untapped, hence approaching one of the objectives in the Bologna process. The project has been undertaken entirely with the software house Macromedia: Director MX 2004 and Flash MX 2004, which has afforded the creation of a multimedia application with animations of the highest quality. Scripting languages (Lingo, JavaScript and ActionScript) have likewise been incorporated, permitting the evolution of even more complex elements for user interaction. The project has been undertaken in Spanish and English with a view to meeting the communication needs of students in a multicultural environment, in harmony with the framework program for didactic strategies in the European Higher Education Area.

Research paper thumbnail of A proposal for the metrological characterization of circular features with digital optical machines

ABSTRACT This paper aims to analyze the different adjustment methods commonly used to characteriz... more ABSTRACT 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, have been implemented in Matlab® and take into consideration as study variables: the amplitude of angular sector of the circular feature, its nominal radio and the magnification used by the optical machine. Under different conditions, it was determined the radius and circularity error of different circular standards. The comparison of the results, obtained by the different methods of adjustments used, with certified values for the standards, has allowed us to determine the accuracy of each method and its scope.