We present hereafter the development of the Liebherr Intelligent Hydraulic Cylinder, in which the hydraulic component is used as smart sensing element providing useful information for the system in which the cylinder is operated. The piston position and velocity are the most important signals derived from this new measuring approach. The performance under various load and temperature conditions (measured both on dedicated test facilities and in field in a real machine) will be presented. An integrated control electronics, which is performing the cylinder state processing, additionally allows the synchronized acquisition of external sensors. Providing comprehensive state information, such as temperature and system pressure, advanced control techniques or monitoring functions can be realized with a monolithic device. Further developments, trends and benefits for the system architecture will be briefly analyzed and discussed.

This master’s thesis deals with design of a headstock for a machine tool. Theoretic part of this thesis provides basic description of a horizontal machine tool. Further it is dedicated to description of a headstock of machines with extensionable work spindle. In a design part firstly optimal variant is chosen by using multicriterial analysis. Necessary calculations were done and chosen variant was developed. Design is realised by 3D CAD model and drawing documentantion.

Master thesis deals with concept and realization of wireless measuring system, powered by battery. The system consists of two main parts. First part, the node, is designed for the lowest possible power consumption. This is achieved mainly by usage of microcontroller from the STM32 family. Gathered information is transfered via RFM69 module. Second part, the gateway, is powered by Linux operating system on Raspberry Pi. Data from the gateway proxy are propagated through MQTT into Home Assistant, which interprets the results.

Submitted by Lucienne Costa (lucienneferreira@ufcg.edu.br) on 2018-04-10T19:01:23Z No. of bitstreams: 1 TARCISIO OLIVEIRA TRAJANO – DISSERTAÇÃO (PPGEM) 2017.pdf: 2697792 bytes, checksum: 3b2e76dd99d5771faa121f9c71b64ab6 (MD5) / Made available in DSpace on 2018-04-10T19:01:23Z (GMT). No. of bitstreams: 1 TARCISIO OLIVEIRA TRAJANO – DISSERTAÇÃO (PPGEM) 2017.pdf: 2697792 bytes, checksum: 3b2e76dd99d5771faa121f9c71b64ab6 (MD5) Previous issue date: 2017-09-01 / Automatizar o processo de medição da variação de massa do produto em um secador solar é um avanço em relação ao procedimento atualmente utilizado que é manual. O objetivo deste trabalho é desenvolver essa automatização utilizando tecnologia apropriada para ser incorporada ao secador solar em desenvolvimento na Universidade Federal de Campina Grande (UFCG). Esses secadores precisam ser simples e de baixo custo para serem utilizados pelo ambiente da agricultura familiar. O processo utilizado consistiu na construção e teste de um protótipo de uma câmara de secagem com forma retangular, de dimensões 32,2 x 43,0 x 34,0 cm, acoplado ao coletor solar. No sistema de medição automatizado foi utilizado uma balança com bandeja em tela de alumínio, de dimensões 37,0 x 21,0 x 6,0 cm, fixada por uma haste de madeira a uma célula de carga, tipo extensômetro de folha, que envia sinais de tensão, proporcionais à variação de massa do produto que esta sendo seco, a uma plataforma de aquisição de dados com Arduino UNO integrada ao equipamento. A célula de carga fixada a bandeja foi instalada dentro e, num experimento seguinte, fora da câmara de secagem. O sistema de aquisição e tratamento de dados também foi instalado na parte externa da câmara de secagem. Foram realizados testes preliminares de medição com a utilização de lâmpadas halógenas, e os resultados obtidos mostraram temperaturas, no interior da câmara, de aproximadamente 45°C ±5ºC, utilizando um peso padrão de 100g. Os resultados obtidos durante a secagem da banana prata (Musa spp), permitiram a construção das curvas de variação de massa de banana e a curva de cinética de secagem. Também foram obtidas as curvas que mostram a variação da temperatura do ar de secagem no interior da câmara. Essa temperatura ficou na faixa de 30ºC a 40ºC, abaixo do esperado que era de 50°C ±10ºC. Por isso a banana atingiu apenas o valor de 44% de teor de umidade em base úmida, acima dos 25% que noBrasil é o máximo para que a banana seca seja considerada banana passa. Foram observadas interferências indesejáveis durante o processo de medição automatizada, as estratégias utilizadas (filtros) para reduzir as interferências não foram suficientes para reduzi-las totalmente e seguirão sendo estudadas em trabalhos futuros. / Automating the process of measuring the mass variation of the product in a solar dryer is an advance over the currently used procedure which is manual. The objective of this work is to develop this automation using appropriate technology to be incorporated into the developing solar dryer at the Federal University of Campina Grande (UFCG). These dryers need to be simple and inexpensive to be used by the family farming environment. The process used consisted in the construction and testing of a prototype of a drying chamber with rectangular shape, dimensions 32.2 x 43.0 x 34.0 cm, coupled to the solar collector. In the automated measurement system, a scale was used with aluminum tray, measuring 37.0 x 21.0 x 6.0 cm, fixed by a wooden rod to a load cell, type extensometer of sheet, which sends voltage signals, proportional to the mass variation of the product being dried, to a data acquisition platform with Arduino UNO integrated to the equipment. The loading cell attached to the tray was installed inside and, in a subsequent experiment, outside the drying chamber. The data acquisition and processing system was also installed on the outside of the drying chamber. Preliminary measurement tests were carried out with the use of halogen lamps, and the results obtained showed temperatures within the chamber of approximately 45°C ± 5°C, using a standard weight of 100 g. The results obtained during the drying of the silver banana (Musa spp) allowed the construction of the banana mass variation curves and the drying kinetic curve. Curves showing the temperature of the drying air inside the chamber were also obtained. This temperature was in the range of 30°C to 40°C, below that expected to be 50°C ± 10°C as a consequence of the low intensity of solar radiation on the days of experiment. Therefore the banana reached only the value of 44% moisture content on wet basis, above the desirable 25%. Undesirable interferences were observed during the automated measurement process, the strategies used (filters) to reduce interferences were not enough to reduce them completely and will continue to be studied in future works.

La résistance mécanique des bétons exigée actuellement impose une diminution du rapport eau/ciment et l’utilisation de superplastifiant pour faciliter la mise en œuvre du matériau frais. Les produits de type polycarboxylate sont très efficaces à court terme, mais peuvent mener à une perte rapide de l’ouvrabilité en cas d’incompatibilité liant/superplastifiant. L’objet de ce travail est l’identification des phases cimentaires impliquées dans ces variations rhéologiques. Dans un premier temps, l’écoulement de pâtes superplastifiées est évalué par un rhéomètre muni d’un système de mesure à boule. Les combinaisons compatibles s’écoulent selon le modèle de Bingham. Une incompatibilité entraîne soit une augmentation du seuil d'écoulement et de la viscosité plastique, soit une évolution des propriétés rhéologiques en un fluide d’Herschel-Bulkley. Dans un deuxième temps, des combinaisons ciment/superplastifiant sont caractérisées par des essais rhéologiques. L’évaluation du raidissement de pâtes et la caractérisation chimique des ciments hydratés montrent que la consistance est liée à la quantité et à la microstructure de l’ettringite formée. Ces paramètres dépendent de la phase aluminate et des sulfates de calcium initialement présents. Enfin, l’étude de systèmes cimentaires de synthèse établit que la solubilité des sulfates de calcium en présence de superplastifiant est augmentée du fait, vraisemblablement, de la complexation des ions Ca2+ par les polycarboxylates. La variété orthorhombique de la phase aluminate plus réactive que la variété cubique, mène, quant à elle, à la formation d’une quantité importante d’ettringite en forme d’aiguilles / Currently required concrete strength imposes a lower water/cement ratio and use of superplasticizer to make easier the fresh material implementation. Polycarboxylate type products are very effective in the short term but can lead to a fast loss of workability in case of binder/superplasticizer incompatibility. The object of this work is the identification of cementitous phases involved in these rheological variations. Initially, flow of various superplasticized pastes is evaluated by a rheometer fitted with a ball measuring system. Compatible combinations flow like a Bingham’s fluid. An incompatibility results in an increase of yield stress and plastic viscosity or rheological properties evolution into Herschel-Bulkley’s fluid. Then, cement/superplasticizer combinations are characterized by rheological tests. Stiffening assessment of pastes and chemical characterisation of hydrated cements show that consistency is associated with amount and microstructure of formed ettringite. These parameters depend on initially present aluminate phase and calcium sulphates. Finally, study of synthetic cementitous systems states that calcium sulphates solubility, in presence of superplasticizer, is increased probably because Ca2+ ions complexation by polycarboxylates. As for the orthorhombic variety of aluminate phase, more reactive than cubic variety, it leads to a large amount of needle-shaped ettringite

The aim of my diploma thesis was programming of systems for measuring AC, DC and impedance measurements. Each measuring system measures selected characteristics of current amplifier with controllable amplification DACA_N. Control programs I have created in Agilent VEE Pro 9.2. The measured data are stored to executable files in MS Excel for further processing. With created measurement programs I made measurements of eight current amplifiers. The results of individual measurements I compiled into graphs and compared with each other circuit characteristics of amplifiers. Then there is described controlling and connection of current amplifier and its construction. At the end the diploma thesis describes amplifiers with the worst and the best measured circuit characteristics. The measured values show that the amplifier DACA_N with slight differences works by theoretical assumptions and measurement systems suggested by me work with no problem.

This master's thesis deals with measurement of torsional rigidity of a vehicle body with the application of TRITOP optical measuring system. The measurement was made in dynamic test-room of Škoda Auto a.s. together with a methodology used by this company. In the light of the objective comparison of both measuring methods and their accuracy, the optimal method of measurment and evaluation was made.

This work deal with, suggestion of measuring procedure of deformation modulus of system Tritop and his application on real instances. Also the measuring procedure of torsional stiffness of vehicle body is designed, and the models of frames including attachment of a car are elaborated, where the measuring of torsional stiffness will be done on.

We present hereafter the development of the Liebherr Intelligent Hydraulic Cylinder, in which the hydraulic component is used as smart sensing element providing useful information for the system in which the cylinder is operated. The piston position and velocity are the most important signals derived from this new measuring approach. The performance under various load and temperature conditions (measured both on dedicated test facilities and in field in a real machine) will be presented. An integrated control electronics, which is performing the cylinder state processing, additionally allows the synchronized acquisition of external sensors. Providing comprehensive state information, such as temperature and system pressure, advanced control techniques or monitoring functions can be realized with a monolithic device. Further developments, trends and benefits for the system architecture will be briefly analyzed and discussed.

The aim of the work is to compare different ways of measuring geometric parametrs of railway track and compare methods for guidance automatic tamping machine in estabilishing the geometrical parameters of the selected track section between train stations Brodek u Přerova - Grygov. The work contains a description of the superstructure gauging carriage and measuring system APK, whose data were used to compare the track geometry and its spatial position during the observation period. Conclusion of the work includes an assessement of individual measurements and recommendations for practise.