Tesis sobre el tema "Coordinates Measuring Machines (CMM)"
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Bittle, Steven Douglas. "An active piezoelectric probe for precision measurement on a coordinate measuring machine (CMM)". Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/18186.
Texto completoRugbani, Ali Milud. "The design, kinematics and error modelling of a novel micro-CMM parallel manipulator". Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86518.
Texto completoENGLISH ABSTRACT: The research presented in this dissertation establishes a micro-CMM parallel manipulator as a viable positioning device for three degree of freedom micro measurement applications. The machine offers the advantages associated with parallel kinematic manipulators, such as light carrying weight, high stiffness and no accumulation of errors, while avoiding some of the traditional disadvantages of parallel manipulators such as the associated effects of angular errors (Abbé error), singularity problems, work space limitation and the extensive use of spherical joints. In this dissertation, the direct position kinematic solution is developed analytically and the solution of the inverse position kinematic is solved numerically. A workspace analysis has been performed. A fully functional prototype demonstrator is fabricated to demonstrate this machine. While the demonstrator was not intended to achieve submicron accuracy, it was intended to validate the error models. Computer controlled measurement is developed and used to position the probe and to record measurements. A reliable kinematic error model based on the theory of error propagation is derived analytically. A numerical method is used to verify the analytical results. Comparison shows that the results of the error model, both analytical and numerical, represent a very good match and follow the same trend. The kinematic position model is validated using a conventional CMM. Results show that an average difference of less than 0.5 mm over a set of 30 points is achieved. This result of the micro-CMM demonstrator measurements falls within the error budget of approximately 0.75 mm estimated by the proposed analytical error model.
AFRIKAANSE OPSOMMING: Die navorsing in hierdie tesis vestig ‘n mikro-CMM parallelle manipuleerder as ‘n lewensvatbare posisioneringstoestel vir drie vryheidsgraad-mikrometing toepassings. Die masjien bied voordele geassosieer met parallelle kinematiese manipuleerders, bv. ligte dra-gewig, hoë styfheid en geen ophoping van foute nie. Die tradisionele nadele van parallelle manipuleerders soos die geassosieerde gevolge van hoekfoute (Abbé fout), enkelvoudigheidsprobleme, werkspasiebeperking en die uitgebreide gebruik van sferiese koppelings word vermy. In hierdie tesis word die direkte posisie kinematiese oplossing analities ontwikkel en die oplossing van die omgekeerde posisie kinematies word numeries opgelos. ‘n Werkspasie analise is uitgevoer. ‘n Ten volle funksionele prototipe demonstrasie-model is vervaardig om hierdie masjien te demonstreer. Die model is nie vervaardig om submikron akkuraatheid te bereik nie, maar eerder om foutmodelle geldig te verklaar. Rekenaar-beheerde metings is ontwerp en gebruik om die toetspen te posisioneer en om metings te neem. ‘n Betroubare kinematiese foutmodel gebaseer op die teorie van foutvoortplanting is analities afgelei. ‘n Numeriese metode word gebruik om die analitiese resultate te bevestig. Vergelyking toon aan dat die resultate van die foutmodel, beide analities en numeries, goeie pasmaats is en dieselfde tendens volg. Die kinematiese posisie model word geldig verklaar deur gebruik te maak van ‘n konvensionele CMM. Resultate wys dat daar ‘n gemiddelde verskil van minder as 0.5 mm oor ‘n stel van 30 punte behaal word. Die resultate van die mikro-CMM model se metings val binne die foutbegroting van ongeveer 0.75 mm geskat by die voorgestelde analitiese foutmodel.
Baird, Patrick James Samuel. "Mathematical modelling of the parameters and errors of a contact probe system and its application to the computer simulation of coordinate measuring machines". Thesis, Brunel University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320548.
Texto completoArencibia, Rosenda Valdés. "Equacionamento das componentes do erro volumétrico em máquinas de medir a três coordenadas". Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-18092015-161256/.
Texto completoThe accuracy and the repeatability of measurements of Three Coordinates Measuring Machines (CMM) are affected by several errors. Among them, geometrical errors are the most influents in the most experimental cases. The result of geometric errors combination in each of the preferentials directions is denominated of volumetric error components. Thus, its possible to know the existent relationship between coordinates of measured points and volumetric error components. Several methods have been proposed to model the behavior of the volumetric error in CMM as a function of the X, Y and Z coordinates. However, sofar from experimental measurements of the volumetric error has bem proposed mathematical model for the descriptions and characterizations of errors was obtained. In this work is presented a general methodology to obtain a mathematical equation and prediction of them components of the volumetric errors, using multiple regression. The methodology was applied at a of \"Moving Bridge\" CMM type. Were obtained three regression equations, one for each component of the error, starting from data collected by direct calibration, specifically by the divided volume method. The model was evaluated statistically. The simulated results were evaluated, discussed and compared with the results obtained through the ball bar calibration, showing an excellent capacity of the model in the prediction of the volumetric error of the machine. Besides was made the compensation of the volumetric error in two diagonals of the working volume of the appraised machine using the proposed model, in this case the error was minimized sensibly.
Avvari, Ddanukash. "A Literature Review on Differences Between Robotic and Human In-Line Quality Inspection in Automotive Manufacturing Assembly Line". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-56038.
Texto completoHájková, Alena. "Návrh interní metodiky pro měření výrobků a dílů na přístroji CMM UPMC Zeiss na pracovišti ČMI Brno". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417433.
Texto completoMarques, Alessandro. "Uma interface eletrônica e computacional para medições a três coordenadas". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-18122015-143939/.
Texto completoSince the advent Coordinate Measuring Machines (CMMs) have improved substantially. However, only a small number of structural modifications were observed. Nowadays, considerable capital expenditure is needed to keep CMM builders competitive. Most important research fields concern structural material and production of more flexible and versatile software. The electronic system and the software used during measurement with CMM are rigid and inaccessible and no user modification is permitted. Typical examples are the predetermined software features and curve fitting methods used on the magnitudes definition process. This research aims to exhibit an interface that copes with the system stiffness and enables signal acquisition from the scales of the CMM, allowing the development of new types softwares. The proposed system was implemented on a moving bridge type CMM. A program that uses the values of the coordinate points obtained from the CMM work volume was created. The software MaqMed 2000 performs the compensation of the coordinates of the used points by means of synthesized errors equations. Evaluation of the performance of the built device was carried out using MaqMed 2000 in practical situations. Data sets were collected along the profile of artefacts and fitted by means of two routines, one with error compensation and the other not compensated. Artefacts were measured in several locations in the whole volume of the CMM. The proximity between the compensated and noncompensated results with respect to the calibrated artefact value was examined. The developed system allowed for error compensation of 98% for bi-dimensional compensation and 87% for tri-dimensional compensation.
Marques, Alessandro. "A correlação entre os erros de retilineidade e angulares nas máquinas de medir a três coordenadas". Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-18122015-111301/.
Texto completoThe metrological performance of a Three Coordinate Measuring Machines (CMM) is related to the capacity of measuring workpieces with a required precision. As every measurement instrument, these machines undergo the effects of internal and external factors that affect the measurement, generating what has been denominated as volumetric errors. Such errors can be obtained through a mathematical model that simulates how the individual errors of the CMM are combined and propagated to any point within the machine working volume. Usually, the independence among the individual errors is adopted when the machine error model is built. However, if the machine geometry is analyzed, the dependence between the straightness error and the angular error can be noted. The objective of this work is to express the angular error as a function of the straightness error. The formulation proposed in this work to express this correlation minimizes the number of calibrations necessary to evaluate the machine behavior. A Brown & Sharp Moving Bridge Coordinate Measuring Machine was used for the experimental evaluation. With this data set and knowing the machine geometry, a mathematical expression relating straightness and angular error was obtained. The calculated error values were then compared with the errors experimentally measured.
Sozak, Ahmet. "Uncertainty Analysis Of Coordinate Measuring Machine (cmm) Measurements". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608887/index.pdf.
Texto completoRICCI, FRANCESCO. "Effective Product Lifecycle Management: the role of uncertainties in addressing design, manufacturing and verification processes". Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2501694.
Texto completoPettersson, Ulf. "Identification and Adaptive Control of a Coordinate Measuring Machine". Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2293.
Texto completoImportant factors in manufacturing are quality and cost. Measuring machines play an important role for these fields. In order to meet higher demands on cost and accuracy, measuring machines can be constructed with weaker materials and increased mechanical flexibilities, and therefore there is a need to include the flexibilities in measuring machine models to obtain good performance.
The core theme in this thesis is modeling and idenfication of the physical parameters of drive mechanisms of a Brown&Sharpe Inc. Global A coordinate measuring machine. The approximation made is that the drive mechanisms can be described by a mass connected by springs, dampers and gear changes. It has been found that a one-spring model gives a reasonably good description of the studied CMM drive mechanism. The physical parameters of this model are identified using off-line algorithms. The algorithms are based on prediction error methods. For the off-line identification the MATLAB System Identification Toolbox and the bond graph representation is used.
The chosen model is then used for control. Traditional control and a Model-reference Adaptive System is derived and studied with the aim to increase the damping of CMM drive mechanisms. It is found that the adaptive system has very good disturbance rejection and can correct for drastic model errors. Another impact is that the damping of the studied drive mechanism can be increased with at least a factor of nine.
Karuc, Emre. "Design Of A Touch Trigger Probe For A Coordinate Measuring Machine". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609112/index.pdf.
Texto completoan anvil gauge setup is designed and proposed in this study. Finally, proposed probe is tested on a three-axis computer controlled electrical discharge machine (EDM), and the results acquired from those experiments are discussed.
Davis, Tyler Addison. "Flexible machine tool control for direct, in-process dimensional part inspection". BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/139.
Texto completoBranko, Štrbac. "Procena merne nesigurnosti pri merenju ravnosti na koordinatnoj mernoj mašini primenom Monte Karlo simulacije". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104130&source=NDLTD&language=en.
Texto completoCoordinate measuring machines (CMMs) are dominant measuringinstruments in dimensional metrology. These machines can measure anymacro-tolerance indicated in the technical documentation. Flatness toleranceis often present with the aim of completing the needed functionalrequirements of a workpiece. The investigation conducted in this paperconsiders the problem of assessing the flatness error measured on a CMMbased on the minimum zone method and on the method of evaluatingmeasurement uncertainty for this measuring task. The emphasis is on theuse of Monte Carlo method as a simulation tool for evaluating measurementuncertainty. A new methodology for assessing the flatness error has beendeveloped, as well as a simulation model for evaluating measurementuncertainty for this measuring task.
Nóbrega, Luiz Henrique Melo Silva. "Desenvolvimento de uma estratégia de medição, baseada em nurbs, para determinação do desvio total de perfil (fα) de engrenagens cilíndricas de dentes retos usando MMCs". Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8961.
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For many years the power transmission and movement for gears has been an important technology in the automotive, mechanical and aeronautical industries, justifying the considerable number of research carried out under the quality control of these components. Nowadays, involute profile inspections of cylindrical gears have been carried out using CNC Coordinate Measuring Machines (CMMs) with rotary tables and dedicated measurement software, equipped with contact scanning sensors, Touch Trigger Probes – TTP or non-contact, Laser. However, many companies that manufacture and inspect gears use manual CMMs with point to point sensors, thus being unable to issue the profile deviation report. In respect, the motivation for this research is to develop and validate inspection strategies for determining the Total Profile Deviation (Fα) of spur gears, according to ISO 1328, using of a mathematical tool NURBS (Non-Uniform Rational B-Splines) and CMMs manual. Strategies for changing the NURBS weight parameter wi also were applied to assist in inspection definition procedure, and this is one more degree of freedom. In the first moment, before the execution of experimental procedures, simulations were carried out on a computational system and showed satisfactory results. For the experimental tests, a manual CMM MICRO-HITE 3D model was used with point to point sensor. Simulations and experimental results showed that the NURBS technique contributes to manual CMM application using Touch Trigger Probes in measuring the spur gears involute profile. The experimental results showed the methodology efficacy.
Por muitos anos a transmissão de movimento e de potência por engrenagens tem sido uma tecnologia importante nas indústrias automotiva, mecânica e aeronáutica, justificando assim a considerável quantidade de pesquisas realizadas no âmbito do controle de qualidade destes componentes. Atualmente, inspeções dos perfis evolventes de engrenagens cilíndricas vêm sendo realizadas utilizando Máquinas de Medição por Coordenadas (MMCs) CNC com mesas rotativas e softwares de medição dedicados, equipadas com sensores por contato de escaneamento, do tipo Touch Trigger Probe – TTP, ou sem contato, Laser. Porém, muitas empresas que fabricam e inspecionam engrenagens utilizam MMCs manuais com sensores do tipo ponto a ponto, ficando assim impossibilitadas de emitir o relatório de desvio de perfil. Neste sentido, a motivação para esta pesquisa é desenvolver e validar estratégias de inspeção para determinação do Desvio Total de Perfil (Fα) de engrenagens cilíndrica de dentes retos, segundo a norma ISO 1328, fazendo o uso da ferramenta matemática NURBS (Non – Uniform Rational B-Splines) e de MMCs manuais. Estratégias para alteração do parâmetro peso wi das NURBS também serão aplicadas para auxiliar na definição do procedimento de inspeção, sendo este um grau de liberdade a mais do modelo. No primeiro momento, antes da execução dos procedimentos experimentais, simulações foram realizadas em um sistema computacional, e apresentaram resultados satisfatórios. Para os testes experimentais foi utilizada uma MMC manual modelo MICRO-HITE 3D, com sensor do tipo ponto a ponto. Resultados de simulações e experimentais mostraram que a técnica NURBS contribui para aplicação de MMC manual usando sensor Touch Trigger na medição do perfil evolvente de engrenagens cilíndricas de dentes retos. Os resultados experimentais demonstraram a eficácia da metodologia desenvolvida.
Tvardek, Michal. "Návrh automatizovaného měřicího pracoviště s průmyslovým robotem". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230961.
Texto completoJi, Hong. "Development of a novel optical contact probing system for nano-CMM". 2008. http://arrow.unisa.edu.au:8081/1959.8/79344.
Texto completoThesis (PhD)--University of South Australia, 2008.