Encontrados 36 documentos, a visualizar página 1 de 4
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...
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...
Textile sensors for ECG and respiratory frequency on swimsuits
Silva, Marcos; Catarino, André P.; Carvalho, Helder; Rocha, Ana; Monteiro, João L.; Montagna, GianniSwimming constitutes one of the most demanding sports regarding technique. Years of training are necessary to master each one of the four styles. An important improvement and help for trainers would be a swimsuit that could provide information during training. This paper presents the research undertaken to develop textile sensors that will be used in a swimsuit. This paper will address ECG and respiratory frequ...
Direct measurement of yarn mass with 1mm accuracy using capacitive sensors
Carvalho, Vítor; Monteiro, João L.; Vasconcelos, Rosa; Oliveira, FilomenaIn Textile production, measurement of yarn mass in 1mm range is of utmost importance to evaluate evenness correctly, as several irregularities occur in 1mm to 4mm yarn length. Direct measurements in the 1mm range are not available in commercial equipments: yarn analysis is based on sample of 8mm. this paper presents a system which enables direct mass measurement in the 1mm range based on parallel capacitive sen...
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 of vital sign monitoring with textile sensors in swimming pool environment
Silva, Marcos; Catarino, André P.; Carvalho, Helder; Montagna, Gianni; Monteiro, João L.; Rocha, A. M.This paper presents the results of a series of experiments aiming at the optimisation of vital sign monitoring using textile electrodes to be used in a swimsuit. The swimsuit will integrate sensors for the measurement of several physiological and biomechanical signals; this paper will focus on ECG and respiratory movement analysis. The data obtained is mainly intended to provide tools for evaluation of high-per...
Cork parquet quality control vision system based on texture segmentation and fu...
Ferreira, Manuel; Santos, Cristina; Monteiro, João L.This paper presents a quality control vision system developed for the inspection of cork parquets that is already applied in the Portuguese cork industry. It is devoted specifically to the most critical quality issues: visibility of the lowest layer (BASE) on the noble layer (UPPER) and the homogeneity of this noble layer. Since these aspects are related with the texture of the raw material, the system was base...
A texture segmentation prototype for industrial inspection applications based o...
Ferreira, Manuel; Santos, Cristina; Monteiro, João L.Purpose – The purpose of this paper is to propose a set of techniques, in the domain of texture analysis, dedicated to the classification of industrial textures. One of the main purposes was to deal with a high diversity of textures, including structural and highly random patterns. Design/methodology/approach – The global system includes a texture segmentation phase and a classification phase. The approach for ...
Parameter monitoring and control in industrial sewing machines : an integrated ...
Carvalho, Helder; Silva, Luís F.; Monteiro, João L.; Rocha, A. M.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 by empirical methods, with machine setting and quality control relying on the skills of operators and tech...
Yarn evenness parameters evaluation : a new approach
Carvalho, Vítor; Monteiro, João L.; Oliveira, Filomena; Vasconcelos, RosaThis paper presents MPSI (Mass Parameterization System), an automatic system for determination of mass characteristics of textile yarn. It is based on 1 mm parallel capacitive sensors, working online or offline. This new approach allows direct measurement of yarn mass in the 1 mm range (increasing the revolution by eight times) [Pinto, J.G., Dissertação de Mestrado, Minho University, 2004; Baxter, L. Capacity s...
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