Jacklyn Reis, Agostinho Castro, João C. W A Costa, Jaume Rius i Riu, Fredrik Lindqvist
CHARACTERIZATION OF SUBSCRIBER LOCAL LOOP BY MEASURES OF FREQUENCY RESPONSE AND TDR

The aim of this paper is to present procedures and methodologies in order to characterize a subscriber local loop which carries Digital Subscriber Line technology. This characterization is based on frequency response and time domain reflectometry measurements performed at local loop under test.

Marek Niedostatkiewicz, Romuald Zielonko
TIME DOMAIN PARAMETER IDENTIFICATION OF ANTICORROSION COATING VIA SOME TYPES OF POLYNOMIAL SIGNALS

The paper presents a time domain method of anticorrosion coating diagnosis on the level of equivalent circuit parameter identification, based on applying a set of shape-designed polynomials and measuring the object’s responses (so-called observables) at a given time T. Equivalent circuit parameters are calculated directly from observables using analytical equations, determined by modelling circuit topology. In the paper the comparison of different polynomial signals (Chebyshev, Legendre, Optimal) against the criteria of stationary error propagation is presented, on the base of analytical and simulation results.

Ricardo Rezende Zucchini
SIMPLIFIED EVALUATION OF THE SMALLEST SAMPLE MASS THAT SHOULD BE TAKEN FOR AN ACCURATE CHEMICAL ANALYSIS

Technology has been developed very much during the last decades. In order to get better materials, with precise chemical composition, electrical properties, thermal properties, etc, it is a must to be capable to accomplish chemical analysis of blends, sometimes dealing with components in very low levels. Today, there are a number of new analytical techniques which allows quantifying extremely low levels of analytes, even employing very small samples. However, using small samples could generate sampling errors. Experimental determination of the minimum sample masses in order to get good accuracy can be a very costly operation, and a time demanding one. In this paper is proposed a simple method to evaluate the minimum sample mass that should be used in chemical analysis, to get low dispersion results.

Giovanni Betta, Domenico Capriglione, Antonio Pietrosanto
FAULT ACCOMMODATION OF MASS AIR FLOW SENSORS IN DIESEL AUTOMOTIVE ENGINES

This paper deals with the design and the application of Artificial Neural Networks to the fault accommodation of the mass air flow meter in diesel engines. Several architectures are proposed and tested. In order to verify their real applicability to the automotive context, making use of suitable graphical tools and computational load indexes, their performance was compared in terms of accuracy and resource requirements.

Guillermo de Anda-Rodríguez, Eduardo Castillo-Castañeda, Salvador Guel-Sandoval, Juan Hurtado-Ramos, Maria Eugenia Navarrete-Sánchez
ON-LINE WEAR DETECTION OF MILLING TOOLS USING A DISPLACEMENT FIBER OPTIC SENSOR

One of the major problems in precision machining processing can be related to the failure condition of the cutting tool. Hence online tool condition-monitoring is of much interest in metal-mechanics industry. The spontaneous problem of failure in a cutting tool, such as chipping and breakage, is becoming more and more important in the manufacturing technology and is usually associated with the stresses put on the tool during the cutting process. Other abnormal tool conditions in metal-machining includes: tool wear, tool-work piece, etc. In this work a method is presented for determining the wear and fracture of a cutting tool, by means of a fiber optic sensor with high resolution and large bandwidth, used during the manufacturing process. The sensor has been configured with two groups of fibers, distributed in a random fashion. One of the groups works as a light emitter that illuminates the tool, while the other captures the light reflected by the tool surface itself. The light is generated by a photodiode, which does not represent any risk to the health. This technique will allow observing the wear and breakage of the tool in real time while the tool is rotating, with a high degree of accuracy.