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Automatic presser-foot force control for industrial sewing machines
Carvalho, Helder; Silva, Luís F.; Rocha, A. M.; Monteiro, João L.To develop and test control methods for real-time automatic presser-foot force control in industrial sewing machines. In this work, a closed-loop controller that controls presser-foot maximum vertical displacement is presented and compared to existing solutions that adjust force depending on sewing speed. Automatic force control can reduce problems such as stitch irregularity, stitch distortions and material da...
Integration of biosignal monitoring in sports clothing
Catarino, André P.; Rocha, A. M.; Carvalho, Helder; Montagna, Gianni; Dias, M. J.; Covas, Helder; Machado, R.; Villas-Boas, J. P.; Duarte, J.The present paper gives an overview of the developments achieved in biosignal and sports performance monitoring in the context of the Bioswim project. The Bioswim project aims at developing technologies for integration of conventional as well as embedding novel textile sensors for the measurement, recording and transmission of biometric and performance parameters for athlete monitoring. The study object has be...
Thin bonding wires temperature measurement using optical fiber sensors
Antunes, P.; Rocha, A. M.; Lima, H.; Varum, H.; André, P. S.In this work we demonstrate the use of optical fiber sensors to measure temperature in thin metallic bonding wires. Temperature was measured in copper wires with diameter of 0.10, 0.28, 0.60 and 0.70 mm and for different values of the driven electrical current (0.75-10.00 A). A theoretical model for the system, which takes into account the relevant heat exchange mechanism, was developed. The results demonstrate...
Throughput limits of two 802.15.4 wireless networks applications for signal acq...
Alves, Joel; Catarino, André P.; Carvalho, Helder; Monteiro, João L.; Rocha, A. M.This work describes the development and test of a wireless sensor network used by a biomedical signal monitoring system. Data communication is based on a body area network (BAN) materialized as a wireless network in two versions, one based on the 802.15.4 specification and another on a higher-level Zigbee protocol. The system was developed using the Jennic JN5148 microcontroller, Jennics ZBPro stack and the Jen...
Biosignal monitoring implemented in a swimsuit for athlete performance evaluation
Catarino, André P.; Carvalho, Helder; Rocha, A. M.; Montagna, Gianni; Dias, M. J.Monitor athletes during exercise has always been a major challenge for engineers and researchers due to the restrictions involving the measurement of physiological and performance parameters. An athlete should have complete freedom to perform his normal activity, in order to be correctly monitored. The advent of e-textiles can give an important contribution to overcome these limitations since it is possible to ...
Integration and embedding of vital signs sensors and other devices into textiles
Abreu, Maria José Araújo Marques; Carvalho, Helder; Catarino, André P.; Rocha, A. M.The development of ubiquitous vital sign monitoring has become a very up-to-date research theme for many academics and industrial companies in the last years. With new materials and integration techniques, it is possible to implement vital sign monitoring in an economic manner, directly into textile products. This unobtrusive presence of sensors is especially important for the monitoring of children or elderly ...
Body modification for enhanced sport performance
Montagna, Gianni; Carvalho, Helder; Catarino, André P.; Dias, M.; Rocha, A. M.Body modifications and its presence in human life are as ancient as human life itself. Its achievement can be very different in terms of expression, and with different levels of body aggressiveness. It could be defined as evasive, when something external is used to reach body modification, as in fashion and others forms of art and expression tending to modify human image; or invasive where the body could be per...
C+L band gain equalization for extended reach WDM-ring PON using hybrid Raman/i...
Neto, B.; Rocha, A. M.; Girão, J. P.; Dionisio, R. P.; Reis, C.; Chatzi, S.; Bonada, F.; Lazaro, J.; Teixeira, A.; André, P. S.“Copyright © [2010] IEEE. Reprinted from ICTON 2010. ISBN 978-1-4244-7798-2. This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissi...
Measurement and analysis of needle penetration forces in industrial high-speed ...
Carvalho, Helder; Rocha, A. M.; Monteiro, João L.The industrial manufacturing of sewn products has always been one of the critical processes of the textile chain concerning quality assurance. Assuring the appropriate set-up and operation of all the machines, and thus the final seam quality, is a very complex task. Traditionally, this task is accomplished through empirical methods, with the machine setting and quality control relying on the skills of operators...
Study and optimization of swimming performance in swimsuit designed with seamle...
Montagna, Gianni; Catarino, André P.; Carvalho, Helder; Rocha, A. M.Hydrodynamic resistance, also called water drag, is one of the most discussed issues in swimming sport and recognized as a major factor in terms of swimming performance. Different authors tried to demonstrate that body compression is responsible for a better result in swimming, based on the fact that body modelling improves energy saving and helps to maintain the performance on repetitive movements. In this pap...
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