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 23 for “"Manufacturing variations"”.
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Aerothermal Sentencing for Manufacturing Variations on Turbine Blade Shrouds
… aerothermal tolerances for shroud platform variations are developed in this research project. Steady RANS simulations are run on a three passage HPT rotor model with engine-representative shroud platform manufacturing variations applied to the middle blade passage. Engine representative …
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2X-Thru, 1X-Reflection, and Thru-Line de-embedding: Theory, sensitivity analysis, and error corrections
… the de-embedding errors due to non-ideal manufacturing effects of non-zero mode conversion terms, as well as the asymmetric, and manufacturing variations. The validations are performed on both theory and self-error reduction through simulation and measurements cases. The 2X-Thru …
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Robust design methodologies: application to compressor blades
… show deviations from their desired shapes due to manufacturing errors, erosion or foreign object damage. In the present study we focus on seeking compressor blade geometries, that are robust in performance in the presence of geometric uncertainty. Sophisticated tools for representing and …
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Scalable, probabilistic simulation in a distributed design environment
… from many sources, such as material properties, manufacturing variations, inaccuracy of models and so on. Concerns about uncertainty and robustness in large-scale integrated design can be significant, especially under the situations where the system performance is sensitive to the variations. …
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Methods for compact modeling of process variations in silicon photonics devices
… photonics models are often not constructed with manufacturing variations in mind. This thesis presents methods for creating simulation models for nanophotonic devices that take systematic and random variations from manufacturing into account. Factorial experiment design is used to explore the …
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Modelling and performance evaluation of coupled micro resonator array for artificial nose
… The research also investigates effect of the manufacturing variations on the CMRA structure performance. With the finger print of the coupled frequency response, the output signal of N multiple resonant sensors is monitored by a single processor; hence, reducing the complexity of readout and …
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Modeling silicon photonics process variations using ring resonator devices
… systems. However, these models do not take manufacturing variations into account and are assumed to be ideal. This thesis establishes the use of models for photonic structures that take spatial and random variations from manufacturing into account. More specifically, we demonstrate two …
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Elastically averaged precision alignment
… has been developed to predict the effects of manufacturing variations on design. To demonstrate the capabilities of this model, a new fiber optic connector has been designed with elastic averaging and precision injection molding in mind. Simulations predict repeatability of approximately 5 …
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Robust design and tolerancing of compressor blades
Variations in the geometry of compressor blades can be introduced by variability in the manufacturing process or by in-service erosion. Recent research efforts have focused on characterizing the impacts of this geometric variability on turbomachinery performance and designing blade geometries whose …
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Characterizing Retention behavior of DDR4 SoDIMM
… 0 or 1 (depending upon the design). Due to manufacturing variations, every tiny capacitor fabricated will have different physical characteristics. Charge leakage depends upon capacitance and other such physical properties. Hence, no two DRAM modules can have the same properties and decay …
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An Optimization-Based Framework for Designing Robust Cam-Based Constant-Force Compliant Mechanisms
… applications because of its simplicity in manufacturing and operation. In this work, several methods are introduced to design these mechanisms, and reduce the sensitivity of these mechanisms to manufacturing uncertainties and frictional effects. The mechanism's sensitivity to these factors …
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Electrochemical Impedance Spectroscopy using adjustable nanometer-gap electrodes
… is easily affected by fringing electric fields, manufacturing variations, and surface chemistry. Existing impedance test cells typically address this problem using a calibration liquid with known permittivity and conductivity, however, this correction is not feasible in many applications since …
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On Implemintation of Loudspeakers for Feedback Control, Open-Air, Active Noise Control Headsets
… open-loop frequency response function, manufacturing variations in loudspeakers that can deviate from design specifications by up to 40%, and the variations in acoustic impedance coupling (ear-to-speaker) among users. This thesis explores the mechanisms that underlie these limitations …
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Flutter and Forced Response of Turbomachinery with Frequency Mistuning and Aerodynamic Asymmetry
… the single family of modes approach by assuming manufacturing tolerance. The unsteady aerodynamic forces are computed using CFD methods assuming aerodynamic symmetry. The aerodynamic asymmetry is applied by perturbing the influence coefficient matrix. These aerodynamic perturbations influence …
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Finite element modeling of a refrigeration compressor for noise prediction applications
… secondary masses, spring mounts, lap-joint and manufacturing variations pose challenges in developing a reliable model. Frequent comparisons are made with experimental mobility scans to obtain insights into the actual behavior of the modeled structure. When possible, weaknesses are located in …
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A Physical Unclonable Function derived from the power distribution system of an integrated circuit
… keys on the IC. A PUF leverages the inherent manufacturing variations of an IC to define a random function. However, poor performance under PUF quality criteria such as the level of randomness and reproducibility in the responses have detracted from their adoption and widespread use. In this …
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A Physical Unclonable Function Based on Inter-Metal Layer Resistance Variations and an Evaluation of its Temperature and Voltage Stability
… emerged as an alternative. PUFs leverage random manufacturing variations as the source of entropy for generating random bitstrings, and incorporate an on-chip infrastructure for measuring and digitizing the corresponding variations in key electrical parameters, such as delay or voltage. PUFs are …
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SPDE-derived random fields in structural optimisation and elastodynamics
… originating from various sources such as manufacturing variations, material heterogeneity, and environmental factors. These imperfections inevitably introduce uncertainties in the performance of structures which are rarely independent and tend to exhibit spatial correlations, which can …
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Extensions to Radio Frequency Fingerprinting
… hardware. Every wireless transmitter has slight manufacturing variations and differences due to the layout of components. These are manifested as differences in the signal emitted by the device. A variety of techniques have been proposed for identifying transmitters, at the physical layer, based …
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Probabilistic finite-difference time-domain simulations using stochastic electromagnetic macro-models
… manifested as random material and structural variations in the design and manufacturing process of the realized system, on the stochastic system's electromagnetic performance. In the current state of the art, and in absence of the stochastic macro-model, it is necessary to perform repeated …
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