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 97 for “"Surface quality"”.
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Particleboard simulation model to improve machined surface quality
… low cost. Unfortunately, cutting can degrade its surface creating rejects and increasing manufacturing costs. A major challenge is PB’s internal variability. Different particle and glue bond strength combinations can sometimes create high quality surfaces in one area and defects such as edge …
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Influences of surface quality on the rolling contact fatique behaviour of ceramics
… the finishing process parameters in relation to surface quality, as well as the feasibility of accelerating the finishing process of HIPed silicon nitride balls. The kinematics of the eccentric lapping were analysed and discussed. Taguchi Methods were used to optimise the finishing parameters to …
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Improving surface quality of SLA 3D printed parts via controlled dip-coating
… printing is often chosen for its relatively high quality surface finish. However, the average surface roughness of SLA 3D printed parts is in the range of 0.4 to 2 [mu], which is relatively rough compared to that of polishing/finishing processes, typically 0.1 to 0.4 gm. Therefore, the objective …
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Optimization of new semi-automatic TIG welding process for surface quality through taguchi method
… and the analysis of samples. The result for surface roughness was found to be better with an average value of Ra 2.96 µm for single bead and Ra 3.08 µm for padding bead when compared to the work of other researchers. Surface hardness has also shown improvement from this research project. …
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Utilizing automated inspection to identify surface quality defects within the automotive body assembly process
… to ensure vehicles are produced with a high-quality surface finish. These inspections occur throughout the vehicle assembly process and are meant to identify surface quality defects as well as determine at which major step in the vehicle assembly process the defect originated. An issue of …
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Development of a layerless additive manufacturing stereolithography machine to improve surface quality and dimensional accuracy
… problem in layered manufacturing giving a lower quality part surface due to created cusps on the surface. Manufacturing the part using a continuous build should theoretically eliminate this issue. A methodology for the design, development and calibration of a new layerless additive manufacturing …
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Computer-aided process planning for surface quality in point-wise constructive manufacturing by three dimensional printing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Powder Bed Surface Quality and Particle Size Distribution for Metal Additive Manufacturing and Comparison with Discrete Element Model
… factors and parameters contribute to the overall quality of a part, one of them being the powder bed itself. So far, little investigation has been dedicated to the behavior of the powder in the powder bed during the lasering process. A powder spreading machine that simulates the powder bed fusion …
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Assessing materials quality for high efficiency electricity generation
… in tetracene. The effect of the interface quality between tetracene and silicon on successful triplet energy transfer is investigated. RFPCD (Radio Frequency Photoconductive Decay) is used to measure the bulk lifetime as well as the surface recombination lifetime of minority carriers in …
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The Development of a Multi-Directional Wear Apparatus and the Characterization and Correlation of Biomechanical and Biotribological Properties of Bovine Articular Cartilage
… and biomechanical characterization of articular surfaces was performed with concomitant translational and oscillating rotational motion similar to that experienced in vivo. Various system parameters were evaluated in the designed experiments including normal load magnitude (high/low), surface …
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Stability and Vibration Analysis of Turning and Face Milling Processes
… cutting forces, standard deviation of vibration, surface quality, and the stability of the machining processes, and the strategies used to machine a part with maximum material rate and/or minimum vibration is also presented.
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Approaches for chatter reduction in deep cavity and intricate surface milling
… increase the metal removal rate or improve the surface quality of an intricate surface cut by a long overhang tool. The results of the metal cutting tests show that the surface quality of a finish cut at conventional milling speeds can be improved by approximately 50% by using a stepped or …
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Effect of chromium (cr) particle size and span-20 surfactant on Aisi d2 hardened steel using electrical discharge machining
… of EDM will cause lower productivity and poor surface quality. Therefore, Powder Mixed Electrical Discharge Machining (PMEDM) has emerged as one of the advanced and innovative technique to eliminate the some of the disadvantages of EDM method. The fine powder particles are added into the tank …
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Inspection & modelling of cusp geometry in additive manufacturing to predict product’s surface roughness
… geometric inaccuracies, and the resulting high surface roughness of the products have been the major problems in employing Additive Manufacturing (AM) technologies. Most of commonly used Additive manufacturing (AM) technologies are developed based on a layer-based manufacturing process to …
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Sensor-based Online Process Monitoring in Advanced Manufacturing
Effective quality improvement in the manufacturing industry is continually pursued. There is an increasing demand for real-time fault detection, and avoidance of destructive post-process testing. Therefore, it is desirable to employ sensors for in-process monitoring, allowing for real-time quality …
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Water Management Diagnostics of a Proton Exchange Membrane Fuel Cell Using Magnetic Resonance Imaging
A final finding is that surface defects in the flow field impact the water distribution pattern. To the author's knowledge, this is the first time the importance of flow field surface quality is considered, and its impact is found to be profound. In our system we find that defects act as 'sticking' …
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Quality control tools for interactive rendering of 3D triangle meshes
In this dissertation we explore methods of quality control of untextured polygonal models. The tools presented build, evaluate and improve on the field of multiresolution analysis through decimation. We evaluate the quality of models generated through various simplification algorithms to develop …
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Electropolishing of Niobium in Sulfuric Acid-Methanol Electrolytes: Development of Hydrofluoric Acid-Free Electrolytes
… the accelerator is critically dependent upon the quality of Nb surface. Electropolishing (EP) in hydrofluoric acid (HF)-containing electrolytes is the currently accepted treatment process. The presence of HF is necessary for the removal of the passive oxide surface film formed in aqueous …
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Spatial modeling for periodic surfaces in manufacturing
… is essential for characterizing and monitoring surface quality in manufacturing. However, the measurement of high-resolution spatial data is generally expensive and time-consuming. Interpolation based on spatial models is a typical approach to cost-effectively acquire high-resolution data. …
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