Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Tolerance analysis"”.
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Tolerance analysis of synthesized dual-reflector antennas
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Computer-aided tolerance analysis of boundary geometry representations of assemblies
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Geometric modeling of manufacturing processes variations for model-based tolerance analysis
In product design, tolerances are specified due to the inherent variabilities of manufacturing processes. Tolerance specifications have significant implications on the quality and cost of the product. For proper tolerance specification, tolerance analysis must be performed. Prototyping is the the …
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Manufacturability of lab on a chip devices: tolerance analysis and requirements establishment
Decisions made during the first stages of the design process can have an impact on the cost, quality and performance of a product. Variation in assemblies, if not managed correctly during the design stage, can have a negative impact on the success of the product. This work analyzes the Daktari CD4+ …
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Representation of geometric variations using matrix transforms for statistical tolerance analysis in assemblies
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Enriching Step-Based Product Information Models to Support Product Life-Cycle Activities
… materials information declaration and tolerance analysis. Due to new environmental regulations, the substance and materials information in products have to be screened closely by manufacturing industries. This requires a fast, unambiguous and complete product information exchange …
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Microassembly technology for modular, polymer microfluidic devices
… detection and diagnosis of disease through DNA analysis and proteomics. For connecting modular devices, precise, passive alignment structures can be used to prevent infinitesimal motions between the devices and minimize misalignment. The motion and constraint of passive alignment structures were …
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Improvement of Release Criteria for Immediate Release Solid Oral Dosage Forms
… the revised content uniformity test, based on tolerance analysis, was subject to an unacceptable level of consumers' risk. The Bergum method proved to be an excellent secondary standard for product assessment and is recommended as an alternative to the USP method. Simulations with the USP …
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Impact of Uncertainties on Structures Damage Tolerance Parameters
… fracture control methods, such as damage tolerance analysis (DTA), assume deterministic factors, considering uncertainties inherent in material properties, inspections, and operational conditions only at the final stage by applying safety factors. This research seeks to incorporate these …
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Design and Construction of a Low-Cost, Low-Field MRI System for MR Signal Acquisition
… Manufacturing feasibility was addressed via tolerance analysis and additive manufacturing, resulting in a magnet assembly achieving an experimental field strength of 49.5mT and homogeneity of 7535 ppmpp. The system includes a complete radiofrequency chain with a solenoidal coil, …
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Computer-aided Analysis of Engineering Tolerances
… components, it is essential that manufacturing tolerances should be analysed to make sure that assemblies fit together satisfactorily and that parts are not produced to unnecessarily tight specifications. The analysis may be divided into three stages: (a) calculation of the sensitivity of a …
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Developing a multi-level fault injection environment
Dependability and fault tolerance are important aspects of modern computer systems. Particle strikes or electromagnetic interference can cause internal state of the system to change, which might cause errors to the system with non-negligible probability. Such errors are termed "soft errors". Bit …
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Designs for Zero Polarization-Mode Dispersion And Polarization-Maintaining Fibers
… optical waveguide devices. In particular, the analysis and design of fibers that maintain polarization over long lengths, provide zero polarization-mode dispersion, and function as polarizers or mode filters are presented. First, optimum designs for high-birefringence as well as …
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Origami as a Tool for Mathematical Investigation and Error Modelling in Origami Construction
… alignments of a given fold within a specified tolerance. Analysis of this method on some examples provides insight into how this might be used in multi-fold constructions. An algorithm to that effect is introduced.
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Designing Active Smart Features to Provide Nesting Forces in Exactly Constrained Assemblies
… this work takes advantage of a proven method for tolerance analysis and enhances this method to include the analysis of these features that supply nesting forces. Along with the enhancement, principles are developed that aid this analysis. All the examples provided in this work are verified using …
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Finite element modelling of fatigue crack growth in multi-layered architectures
… step extensions to account for crack growth. The analysis of forecasted paths for deflected and bifurcated cracks showed the tendency of the crack to grow parallel to the layers orientation within the compliant interlayer, as observed experimentally, and following a path which maximised the crack …
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Nonlinear Optics in III-V Quaternary Semiconductor Waveguides
… AlGaAsSb and InGaAsP. We present modal analysis for waveguide designs and show that effective mode area much less than 1 $\mu m^{2}$ can be obtained. We also report specific waveguide designs that display zero-dispersion points at the specific wavelength ranges of interest. The designed …
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Reliability and Accuracy of a Novel Photogrammetric Orthodontic Monitoring System
… from the reference scanner using Friedman’s analysis (=.05). Intra-operator and inter-operator variability were evaluated and expressed as the intraclass correlation coefficient. Results: Surface tolerance analysis demonstrated a maximum mean global error of 100 microns associated with the …
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Refined theories and Discontinuous Galerkin methods for the analysis of multilayered composite structures
… damage effects. One of the key aspects of the analysis of composite structures is the accurate prediction of the stress field; it can be obtained employing several numerical methods that can provide very detailed results at an high computational cost. This approach is well suited for small …
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Analysis and design of broadband single-mode multi-clad fibers
… are sensitive to bending and manufacturing tolerances, and are not truly single-mode at most wavelengths of interest. To remedy these problems a new series of broadband dispersion-flattened truly single-mode fiber designs are proposed. These fibers have both dispersion-shifted and …
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