The steel through-truss Traffic Bridge, located in Saskatoon, Saskatchewan is over one hundred years old. The bridge has been subject to ongoing maintenance throughout its service life. However, inspection reports from 2005 and 2006 highlighted the severe deterioration experienced primarily by the steel members immediately above and below the deck surface. These reports prompted the City of Saskatoon (COS) to implement a rehabilitation project that involved the installation of a post-tensioning system to relieve the badly corroded bottom chord members of the axial loads due to the self-weight of the structure, in 2006. Due to the severe deterioration and the structural modifications that the Traffic Bridge has endured, a limited scope structural health monitoring (SHM) system, based on strain measurements, was implemented to reduce some of the uncertainty regarding the active load paths occurring at the deck level. The objectives of the SHM study were to obtain more information regarding the actual load paths and ascertain possible types of structural redundancy, to determine how to best model this type of structure, and to find ways to track ongoing deterioration using instrumentation. The SHM study involved controlled truck loading scenarios to permit measurement of the load paths and provide data to compare the measured results to a finite element (FE) model of the instrumented span. In addition, random loading scenarios were used to capture the vertical dynamic response of the structure in order to further refine the FE model. This study focused on the response of one-half of one interior span. A total of 72 strain gauges were installed. The downstream truss was highly instrumented at ten locations, three members of the upstream truss were instrumented to measure the distribution, and the floor joists in the downstream lane were instrumented to establish possible redundancy paths. Using an FE model in combination with the measured strain data, it was found that redundant load paths only existed at the level of the deck. The bottom chord members experienced non-zero strains once the control vehicle was past the span, possibly indicating some level of redundancy. The members believed to relieve a portion of the bottom chord tensile forces included the car joists, edge joists, and the timber deck. The amount of force transferred from the bottom chord to the deck members was found by FE analysis to be highly related to the lateral stiffness of the floor beams. The FE model was adjusted to match the measured results by modifying various modelling parameters. The most important features of the model were that all deck elements were modelled to be located at the elevation of the bottom chord, that the lateral stiffness of the floor beams was reduced by 50% to best represent the transfer of forces to deck elements, and that the stiffness of bottom chord members was reduced to 80% of their pristine values. In combination with calibrated modification factors applied to the measured values, this FE model is believed to be a useful tool to represent the behaviour of the structure to assist in detecting further damage by modelling the strain differential between members, and components of members.

Thesis (M.S.)--University of Missouri-Columbia, 2008. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 13, 2009) Includes bibliographical references.

A remada em Canoagem Velocidade se caracteriza por ser um movimento bilateral, cíclico e simétrico, sendo que a propulsão é gerada, principalmente, pelos membros superiores. Não estão claros os aspectos relacionados à assimetria entre os hemicorpos da remada e, quanto a esta influência, o desempenho no deslocamento de caiaques de Canoagem Velocidade. O presente estudo teve como objetivos quantificar e comparar a quantidade de força aplicada à água, em atletas de diferentes níveis de desenvolvimento, bem como estabelecer a relação entre essas variáveis e o desempenho durante a execução de um teste máximo de 200 m em um caiaque individual de Canoagem Velocidade. Foram avaliados 90 atletas, com idade entre 10 a 40 anos, sendo que os mesmos foram subdivididos em três grupos, de acordo com seu nível de desenvolvimento: Iniciantes, Intermediários e Avançados. Foi encontrado que atletas de nível de desenvolvimento mais avançado eram os mais velhos, mais altos, mais pesados, mais experientes e mais rápidos que os atletas dos níveis menos avançados (p<0,001). Os atletas dos níveis de desenvolvimento mais avançado também produziram mais força que os seus pares de nível Intermediário e Iniciantes. Contudo, não foram encontradas diferenças significantes tanto para a diferença entre os lados, bem como quanto à dominância lateral foi levada em consideração. Além disso, não foi encontrada relação entre diferença na produção de força entre os lados direito e esquerdo e o desempenho em 200m. Por outro lado, a força máxima apresentou correlação negativa significante (r=-0,92, ES – quase perfeito) com desempenho em 200 m. Por fim, foi verificado que o equipamento utilizado apresentou reprodutibilidade aceitável para mensurar a força em atletas de Canoagem Velocidade. Foi concluído que tanto características morfofisiológicas e técnicas em atletas de Canoagem Velocidade apresentam desenvolvimento contínuo, de acordo com tempo e quantidade de prática na modalidade. / Sprint Kayak stroke can be characterized as a bilateral, cyclic and symmetrical movement, where the propulsion lies mainly on the upper body. It is not clear, however, whether the stroke asymmetry affects Sprint Kayak performance. Therefore, this study aimed to quantify and compare force production amongst three developing level as well as to establish the relationships between force production and difference in left/right force production in those three different developing levels and 200 m performance in Sprint Kayak athletes. 90 athletes with ages ranging from 10 to 40 years volunteered for this study. They were allocated into three different groups based on developing level: Beginner, Intermediate and Advanced. Athletes of more advanced levels were older, taller, heavier, more experienced and faster than their lower level counterparts (p<0,001). Athletes from more advanced level also produced higher force scores than the intermediate and beginner levels. However, the force difference as well as lateral dominance were not different. Moreover, it was not found relationship between the difference and performance over 200 m. On the other hand, maximal force presented significant correlation with 200 m performance (r=-0,92 ES – nearly perfect). Finally, it was verified that the equipment used to measure force was reprodutible. In conclusion, morfophysiological and technical characteristics of Sprint Kayak athletes present a continuous development, according to time and amount of practice.

A remada em Canoagem Velocidade se caracteriza por ser um movimento bilateral, cíclico e simétrico, sendo que a propulsão é gerada, principalmente, pelos membros superiores. Não estão claros os aspectos relacionados à assimetria entre os hemicorpos da remada e, quanto a esta influência, o desempenho no deslocamento de caiaques de Canoagem Velocidade. O presente estudo teve como objetivos quantificar e comparar a quantidade de força aplicada à água, em atletas de diferentes níveis de desenvolvimento, bem como estabelecer a relação entre essas variáveis e o desempenho durante a execução de um teste máximo de 200 m em um caiaque individual de Canoagem Velocidade. Foram avaliados 90 atletas, com idade entre 10 a 40 anos, sendo que os mesmos foram subdivididos em três grupos, de acordo com seu nível de desenvolvimento: Iniciantes, Intermediários e Avançados. Foi encontrado que atletas de nível de desenvolvimento mais avançado eram os mais velhos, mais altos, mais pesados, mais experientes e mais rápidos que os atletas dos níveis menos avançados (p<0,001). Os atletas dos níveis de desenvolvimento mais avançado também produziram mais força que os seus pares de nível Intermediário e Iniciantes. Contudo, não foram encontradas diferenças significantes tanto para a diferença entre os lados, bem como quanto à dominância lateral foi levada em consideração. Além disso, não foi encontrada relação entre diferença na produção de força entre os lados direito e esquerdo e o desempenho em 200m. Por outro lado, a força máxima apresentou correlação negativa significante (r=-0,92, ES – quase perfeito) com desempenho em 200 m. Por fim, foi verificado que o equipamento utilizado apresentou reprodutibilidade aceitável para mensurar a força em atletas de Canoagem Velocidade. Foi concluído que tanto características morfofisiológicas e técnicas em atletas de Canoagem Velocidade apresentam desenvolvimento contínuo, de acordo com tempo e quantidade de prática na modalidade. / Sprint Kayak stroke can be characterized as a bilateral, cyclic and symmetrical movement, where the propulsion lies mainly on the upper body. It is not clear, however, whether the stroke asymmetry affects Sprint Kayak performance. Therefore, this study aimed to quantify and compare force production amongst three developing level as well as to establish the relationships between force production and difference in left/right force production in those three different developing levels and 200 m performance in Sprint Kayak athletes. 90 athletes with ages ranging from 10 to 40 years volunteered for this study. They were allocated into three different groups based on developing level: Beginner, Intermediate and Advanced. Athletes of more advanced levels were older, taller, heavier, more experienced and faster than their lower level counterparts (p<0,001). Athletes from more advanced level also produced higher force scores than the intermediate and beginner levels. However, the force difference as well as lateral dominance were not different. Moreover, it was not found relationship between the difference and performance over 200 m. On the other hand, maximal force presented significant correlation with 200 m performance (r=-0,92 ES – nearly perfect). Finally, it was verified that the equipment used to measure force was reprodutible. In conclusion, morfophysiological and technical characteristics of Sprint Kayak athletes present a continuous development, according to time and amount of practice.

A remada em Canoagem Velocidade se caracteriza por ser um movimento bilateral, cíclico e simétrico, sendo que a propulsão é gerada, principalmente, pelos membros superiores. Não estão claros os aspectos relacionados à assimetria entre os hemicorpos da remada e, quanto a esta influência, o desempenho no deslocamento de caiaques de Canoagem Velocidade. O presente estudo teve como objetivos quantificar e comparar a quantidade de força aplicada à água, em atletas de diferentes níveis de desenvolvimento, bem como estabelecer a relação entre essas variáveis e o desempenho durante a execução de um teste máximo de 200 m em um caiaque individual de Canoagem Velocidade. Foram avaliados 90 atletas, com idade entre 10 a 40 anos, sendo que os mesmos foram subdivididos em três grupos, de acordo com seu nível de desenvolvimento: Iniciantes, Intermediários e Avançados. Foi encontrado que atletas de nível de desenvolvimento mais avançado eram os mais velhos, mais altos, mais pesados, mais experientes e mais rápidos que os atletas dos níveis menos avançados (p<0,001). Os atletas dos níveis de desenvolvimento mais avançado também produziram mais força que os seus pares de nível Intermediário e Iniciantes. Contudo, não foram encontradas diferenças significantes tanto para a diferença entre os lados, bem como quanto à dominância lateral foi levada em consideração. Além disso, não foi encontrada relação entre diferença na produção de força entre os lados direito e esquerdo e o desempenho em 200m. Por outro lado, a força máxima apresentou correlação negativa significante (r=-0,92, ES – quase perfeito) com desempenho em 200 m. Por fim, foi verificado que o equipamento utilizado apresentou reprodutibilidade aceitável para mensurar a força em atletas de Canoagem Velocidade. Foi concluído que tanto características morfofisiológicas e técnicas em atletas de Canoagem Velocidade apresentam desenvolvimento contínuo, de acordo com tempo e quantidade de prática na modalidade. / Sprint Kayak stroke can be characterized as a bilateral, cyclic and symmetrical movement, where the propulsion lies mainly on the upper body. It is not clear, however, whether the stroke asymmetry affects Sprint Kayak performance. Therefore, this study aimed to quantify and compare force production amongst three developing level as well as to establish the relationships between force production and difference in left/right force production in those three different developing levels and 200 m performance in Sprint Kayak athletes. 90 athletes with ages ranging from 10 to 40 years volunteered for this study. They were allocated into three different groups based on developing level: Beginner, Intermediate and Advanced. Athletes of more advanced levels were older, taller, heavier, more experienced and faster than their lower level counterparts (p<0,001). Athletes from more advanced level also produced higher force scores than the intermediate and beginner levels. However, the force difference as well as lateral dominance were not different. Moreover, it was not found relationship between the difference and performance over 200 m. On the other hand, maximal force presented significant correlation with 200 m performance (r=-0,92 ES – nearly perfect). Finally, it was verified that the equipment used to measure force was reprodutible. In conclusion, morfophysiological and technical characteristics of Sprint Kayak athletes present a continuous development, according to time and amount of practice.

Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-03-11T16:35:02Z No. of bitstreams: 2 Dissertação - Halan Faria Lima - 2014.pdf: 3459436 bytes, checksum: 17181afad5040dd31a88913bcbc2ccca (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-03-13T18:59:57Z (GMT) No. of bitstreams: 2 Dissertação - Halan Faria Lima - 2014.pdf: 3459436 bytes, checksum: 17181afad5040dd31a88913bcbc2ccca (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-03-13T18:59:57Z (GMT). No. of bitstreams: 2 Dissertação - Halan Faria Lima - 2014.pdf: 3459436 bytes, checksum: 17181afad5040dd31a88913bcbc2ccca (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2014-03-06 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / The simulations of the kinetic impact of rain on a river basin are important for agronomic, environmental and regional planning. This study aimed to use data and rainfall characteristics such as density of precipitation, slope and direction of rainfall, as topographical features, inclination and orientation of the aspects to simulate the kinetic energy of rain on the slopes and the attenuating effect of the vegetation cover in reducing these kinetic effects. Were used rainfall data measured in the UFG weather station for this, together with data from rain gauges vector, collected during the years 2012 and 2013, trying to simulate the effects on and off-season crop, using classes of land use in the catchment area of the river Paraíso. The results showed that the rain gauge PVC 163 cm ² is compatible with standard rain gauge INMET, whose data were used for this study. Analysis of the results showed that most of the rainfall comes from southeast, followed by coming rains from the south. The slope and orientation of the aspects of the terrain within the basin favored the simulation in a view to highlighting these impacts. The highest rainfall was in February 2012 (244.3 mm) and January 2013 (252.6 mm), the largest attenuation of impacts occurred during the months of April 2012 and January 2013, mainly on the slopes contrary direction predominant rains and approximate slope to the inclination of the rains. It was also observed that the attenuating effect of ground cover showed accented results regarding coverage and growing season and this takes to the conclusion that the simulation reached adopted relevant results once it became clear where the largest reductions occur. / As simulações dos impactos cinéticos da chuva sobre uma bacia hidrográfica são importantes para planejamento agronômico, ambiental e regional. Este trabalho teve como objetivo utilizar dados e propriedades pluviométricas como: densidade das precipitações, direção e inclinação das chuvas, aspectos topográficos como, declividade e orientação das vertentes, para simular a energia cinética das chuvas sobre as encostas e o efeito atenuante da cobertura vegetal na redução destes impactos cinéticos. Para isso foram utilizados dados pluviométricos medidos na estação meteorológica da UFG, juntamente com dados de pluviômetros vetoriais, coletados durante os anos de 2012 e 2013, procurando simular os efeitos na safrinha e safra, utilizando as classes de uso do solo na bacia hidrográfica do ribeirão Paraíso. Os resultados mostraram que o pluviômetro de PVC de 163 cm² é compatível com o pluviômetro padrão do INMET, cujos dados foram utilizados para o presente estudo. As análises dos resultados mostraram que a maioria das chuvas vem de sudeste, seguida por chuvas vindas do sul. A declividade e orientação das vertentes dentro da bacia favoreceram a simulação no sentido de evidenciar esses impactos. As maiores precipitações foram em fevereiro de 2012 (244,3 mm) e janeiro de 2013 (252,6 mm), as maiores atenuações de impactos ocorreram durante os meses de abril de 2012 e janeiro de 2013, principalmente sobre as vertentes contrárias a direção predominante das chuvas e com declividade aproximada à da inclinação das chuvas. Foi observado também que o efeito atenuante da cobertura do solo mostrou resultados acentuados em relação à cobertura e época de cultivo e isso leva a concluir que a simulação adotada chegou a resultados relevantes uma vez que foi possível evidenciar onde ocorrem as maiores reduções.

Atualmente, os implantes são utilizados em diversos tipos de tratamento na reabilitação oral. Para manutenção da osseointegração, é essencial que o conjunto prótese/implante/osso seja submetido a forças às quais estejam aptos a suportar. Os diferentes tipos de desadaptações das infraestruturas das próteses sobre implantes são fatores que podem contribuir para o aumento das tensões na região peri-implantar. Este estudo teve como objetivo avaliar a influência das desadaptações angulares unilaterais na distribuição de tensões na região periimplantar de pilares tipo UCLA, no momento da pré-carga e carga axial. Infraestruturas de CoCr, confeccionadas utilizando-se pilares tipo UCLA, foram divididas em quatro grupos: Grupo A (adaptado), Grupo B, Grupo C e Grupo D (50, 100 e 200 &#x3BC;m de desadaptação unilateral angular por vestibular, respectivamente). Cada grupo foi representado por quatro infraestruturas (n=4). Quatro implantes (4.1mm/15mm) foram posicionados em uma matriz metálica, onde posteriormente foi vazado o poliuretano (PU), com função de simular o tecido ósseo. Quatro extensômetros (strain gauges) foram posicionados na região vestibular, distal, lingual e mesial de cada implante, para aferir a quantidade de deformação; cada grupo foi posicionado em seu respectivo implante. Foram realizados dois testes: o teste de pré-carga com um torque de 32Ncm e o teste de carga com uma força axial estática de 300N. Cada infraestrutura foi sujeita aos dois testes, por cinco vezes. Para análise estatística dos dados, foram utilizados ANOVA (dois critérios) e o teste de Tukey (p<0,05). Os resultados mostraram que os grupos A e B tiveram menos deformação da região peri-implantar em ambos os testes, quando comparados aos grupos C e D. A estatística também mostrou que o Grupo A apresentou melhor distribuição de tensões em sua região, peri-implantar quando comparado aos outros três grupos (p<0,05). Como conclusões, este estudo mostrou que as desadaptações influem na distribuição das tensões da região peri-implantar e que quanto maior o nível de desadaptação, mais altas são as tensões geradas. / Nowadays implants are used in several kinds of oral rehabilitation treatments. For the osseointegration maintenance it is important that crow/implant/bone are subjected to forces which are able to withstand. Different kinds of misfit on the crown frameworks are factors that could lead to an increase of strain around the implanted bone. This study aimed to evaluate the influence of the unilateral angular misfit in frameworks made of UCLA on the peri-implant strain distribution, subjected to preload and axial load. Frameworks made of chrome-cobalt were fabricated on UCLA abutments and divided in 4 groups: Group A (no misfit), Group B, Group C, Group D (50, 100, and 200 of unilateral angular misfit by buccal side, respectively). Each group was represented for 4 frameworks (n=4). Four implants (4.1mm/15mm) were positioned in a metallic matrix which was subsequently poured the polyurethane (PU) to simulate the bone. Four strain gauges were positioned on the buccal, distal, lingual and mesial sides of each implant to assess the amount of strain, each group was connected on its respectively implant. It was performed 2 tests: the preload test with a 32Ncm torque and the load test by applying an axial force of 300N. Each framework was subjected to the both test five times. To the statistics analysis ANOVA (2 ways) and Turkeys test were performed. The results showed that the Groups A and B presented less deformation when compared to Groups C and D. The statistics also showed that the Group A presented better distribution of strain on its peri-implant bone when compared to the other three groups (p<0,05). In conclusion this study showed that misfit had influence on the strain distribution on the peri-implant bone and that strain increased on the Groups C and D which presented higher levels of misfit.

Les récentes normes environnementales et les demandes de réduction des émissions et de consommation de carburants des moteurs essence exigent de nouvelles stratégies de combustion par lesquels le mélange air/essence devrait être méticuleusement commandé en temps réel par un capteur de pression. Le contrôle de la pression cylindre est une technologie principale qui permet une coordination optimisée du mélange air/carburant, et la recirculation des gaz d'échappement par la rétroaction de contrôle. A ce jour, la mesure de pression cylindre en temps réel n'est pas fournie même sur les voitures récentes. Jusqu'à présent cette mesure a été mise en application sur des moteurs spécifiques pour le développement d'applications particulières telles que le contrôle moteur. Plusieurs obstacles empêchent l'intégration des capteurs de pression sur les nouveaux moteurs; le coût de production élevé de ces dispositifs et leurs implémentations complexe sur les moteurs standards retarde leur développement.Le capteur de pression GCS™ (Gasoline Combustion Sensor) est un capteur non-intrusif de pression cylindre intégré dans une bougie d'allumage qui a un accès direct à la chambre de combustion. Il répond aux contraintes d'intégration automobile, de performance et de fiabilité, et permet la mesure de pression jusqu'à 200bar et du cliquetis. Ce type de capteur permet le suivi de combustion en temps réel exigé pour la combustion par auto-allumage par laquelle la rétroaction rapide des événements de combustion permet la gestion étincelle/carburant dans chaque cylindre. Il agit sur l'allumage aussi bien que sur l'injection pour optimiser la combustion et réduire la consommation de carburant d'environ 1.4% et les émissions de polluants d'environ 10%.La présente thèse concerne le développement d'un capteur de pression fiable et bas-cout qui sera une condition de base pour les prochaines générations de moteurs. Cette étude concerne deux types d'éléments sensibles différents. L'un est basé sur une céramique piézoélectrique, et l'autre comporte un système piézo-résistif de jauges de contraintes sérigraphiées sur l'isolant céramique de la bougie d'allumage. Durant cette analyse, des problèmes mécaniques ont été soulignés et une section a été consacrée pour résoudre le problème de transmission de pression à l'élément sensible réduisant les bruits mécaniques notamment. Différents concepts mécaniques ont été développés et regroupés sous plusieurs familles, dont deux catégories ont été retenues pour la suite du développement.Le premier chapitre décrit le projet d'un vue globalement, les caractéristiques du capteur et le principe de mesure. Le second chapitre se rapporte à l'élément sensible et la description des technologies utilisées. Le développement mécanique du corps d'épreuve du capteur basé sur un élément sensible piézoélectrique sera présenté en détail dans le troisième chapitre. Le quatrième chapitre comprend la caractérisation des deux types de capteurs piézoélectriques et piézo-résistifs. Le cinquième chapitre décrit le traitement du signal issu de l'élément sensible et le packaging du capteur. Le dernier chapitre présente une perspective d'optimisation du dispositif. / Recent environmentally-friendly norms and global demands for lower emissions and lower fuel consumption on gasoline engines require innovative combustion strategies, whereby air/fuel mixture should be meticulously controlled through a real time pressure feed-back sensor. In-cylinder pressure control has shown to be a key technology that enables an optimized coordination of an air/fuel mixture, and exhaust gas recirculation through closed loop control.Nowadays real time in-cylinder pressure measurement is not provided on passenger's cars. Thus far it has been implemented on specific engine for development of particular applications such as engine control. Several obstacles prevent the integration of pressure sensors on new engines such as high production cost of this device and its complex implementation on a standard engine. The Gasoline Combustion Sensor™ (GCS) is a non-intrusive in-cylinder pressure sensor integrated into a spark plug which has direct access to the combustion chamber. It answers the automotive integration constraints performance and reliability and allows in-cylinder pressure measurement up to 200bar, knock and misfiring detection.Such sensors allow for combustion follow-up in a real-time direct mode required for auto ignition combustion whereby fast feedback of combustion events enables fine tuning and individual cylinder spark/fuel management. It operates on the ignition as well as on the injection to optimize the combustion and reduce fuel consumption by an average of 1.4% under steady-state conditions, which will reduce harmful emissions by about 10%. The present thesis relates to the development of a low-cost pressure sensor which will be a basic requirement for future engine generations. It consists on two different sensing element types, one is based on piezoelectric ceramic, and the other comprises piezo-resistive strain gauge system directly embedded on the ceramic insulator. During this analysis, mechanical problems have been emphasized and a section was dedicated to resolve the problem of the pressure transmission to the sensing element reducing structure-borne noise on the sensor. Different mechanical concepts have been developed, where two categories have been selected.Chapter one describes the project in a global overview including sensor specifications and sensing principle, chapter two relates to the sensing element materialization including technology description. Proof body development based on piezoelectric sensor will be presented in detail in chapter three, while chapter four contains device characterization of both sensor types piezoelectric and piezo-resistive. Chapter five describes the signal processing and sensor packaging, and chapter six gives an optimization perspective of the device.

The diploma thesis is focused on the measurement of forces acting between the tire and the road. There is an outline of tire and tire models problematic in the opening part. In the following part, the rear right suspension of the formula student car was mounted with strain gauges and the data logging system was described. There is also a multi-body model of the rear axle created in Adams/Car and SAMS software, that is able to calculate forces acting between the tire and the road, taking the measured forces in the suspension, rocker position, and throttle position into consideration. After a series of calibrations and verification measurements, the measurement on the test track was made, with data analysis focused on forces acting between the tire and the road.

I laborationssalarna på KTH i Södertälje, som i huvudsak används till elektrorelaterade ämnen, har det funnits ett antal balkmodeller med monterade töjningsgivare. Dessa har inte använts på många år och det saknas vidare uppgifter om modellerna. Uppdraget bestod av att utarbeta en laboration till KTH:s undervisning. Laborationen skulle handla om balkböjning och signalbehandling, med tonvikt på̊ det senare. Som hjälpmedel skulle vi använda oss av balkmodellerna. I uppdraget ingick det också att undersöka balkmodellernas elektriska och mekaniska egenskaper. Med teknisk balkteori skulle en möjlig relation mellan nedböjning och töjning tas fram. Med balkmodellen i en bryggkoppling kunde dess signal via ett DAQ-kort överföras till en PC och LabVIEW för vidare behandling. I LabVIEW kan ett anpassat gränssnitt tas fram och för visning av valda parametrar. Bryggkopplingen balanseras med hjälp av en potentiometer. I gränssnittet kan spänningsförändringen i bryggan observeras när balken påverkas av nedböjning. Efter kalibrering av systemet kan töjning och nedböjning presenteras efter beräkningar i LabVIEW. För att erhålla en så stabil och brusfri signal som möjligt har gruppen använt sig avbåde ett hårdvarufilter av lågpass-typ och ett mjukvarufilter i LabVIEW. Signalen förstärks med hjälp av en OP-förstärkare innan den matas in i DAQ-kortet. Trots sin ålder kunde balkmodellerna fortfarande användas och ge stabila signaler för vidarebehandling. Modellerna kan med fördel användas i en laboration för studenter och färdigt underlag finns för detta. Laborationen bör öka förståelsen för hur en signal från en givare kan förstärkas, filtreras och behandlas vidare i detta fall för grundläggande hållfasthetsberäkningar. / In the laboratory at KTH in Södertälje, which are mainly used for electro-related subjects, there are a number of beam models with mounted strain gauges. These have not been used for many years and there is no further information about the models. The assignment consisted of preparing a laboratory task for KTH's teaching. The laboratory would consist of beam bending and signal processing, with emphasis on the latter. As an aid, the beam models will be used, these consisted of a fixed aluminum beam with mounted strain gauges. The assignment also includes examining the electrical and mechanical properties of the beam models. With technical beam theory, a possible relationship between deflection and strain would be developed. With the beam model connected in a bridge connection, its signal could be transferred via a DAQ card to a PC and LabVIEW for further processing. In LabVIEW, a custom interface can be created and for displaying selected parameters. The bridge coupling is balanced with the help of a potentiometer. In the interface, the voltage change in the bridge can be observed when the beam is affected by deflection. After calibration of the system in the interface, strain and deflection can be presented according to calculations in LabVIEW. To obtain as stable and noise-free a signal as possible, the group has used both a low-pass hardware filter and a LabVIEW software filter. The signal is amplified by an OP amplifier before being fed into the DAQ card. Despite their age, the beam models could still be used and give stable signals for further treatment. The models can be used to advantage in a laboratory for students and there is a ready basis for this. The laboratory should increase the understanding of how a signal from a sensor can be amplified, filtered and further processed in this case for basic strength calculations.