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 34 for “"reliability method"”.
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Performance-based earthquake engineering with the first-order reliability method
… field of study that complements the prescriptive methods that the design codes provide to ensure adequate seismic performance of structures. Accounting for uncertainties in the performance assessments forms an important component in this area. In this context, the present study focuses on two …
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Modified inverse first-order reliability method (I-FORM) for predicting extreme sea states
… of record. The use of the inverse first-order reliability method (I-FORM) is standard design practice for generating environmental contours. This thesis develops enhanced methodologies for data analysis prior to the application of the I-FORM, including the use of principal component analysis …
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A reliability method for the analysis of turboelectric distributed propulsion electrical network architectures
… emissions targets. This thesis presents a method for evaluating the power and reliability profiles exhibited by a number of electrical propulsion network architectures specific to TeDP aircraft. The method is used to clearly determine the probability that each variation of the network will …
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An effective optimisation method for multifactor and reliability-related structural design problems
… and multi-disciplinary (MO–MD) optimisation method (multifactor optimisation of structure techniques, MOST) which is coupled with finite element analysis (FEA) as an analysis tool for seeking the optimum design. The effectiveness of the MOST technique is demonstrated in two case studies.Next, …
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Efficient time-dependent system reliability analysis
… Accurate and efficient estimate of system reliability is crucial for decision makings on system design, lifetime cost estimate, maintenance strategy, etc. Although significant progresses have been made in time-independent reliability analysis for components and systems, time-dependent …
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Reliability analysis of green roofs under different storm scenarios
… area. Green infrastructure offers an alternative method of runoff reduction, by using natural processes to infiltrate, store, and treat runoff at its source. In particular, green roofs can promise multiple benefits in terms of runoff reduction, air quality improvement, and mitigation of the urban …
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Stochastic analysis of structures made of composite materials
A probabilistic methodology for the reliability analysis of composite rotor blades at the ply level was developed. The proposed methodology involves (i) the quantification of the uncertainties (physical, statistical and model) related to the material properties and the extreme aero-elastic loads …
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Probabilistic analysis of the plastic collapse of random media
Two new, efficient probabilistic methods are presented for evaluating the reliability of an elastic/perfectly plastic continuous medium exhibiting randomly varying yield strength. Both the Tresca and Mohr-Coulomb yield criteria are considered in the present study. The two probabilistic methods …
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System Reliability-Based Design and Multiresolution Topology Optimization
Structural optimization methods have been developed and applied to a variety of engineering practices. This study aims to overcome technical challenges in applying design and topology optimization techniques to large-scale structural systems with uncertainties. The specific goals of this …
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Optimization of retrofit decisions as risk mitigation strategies for infrastructure
… formulation uses the Matrix-based System Reliability method to estimate the uncertainty parameters and the Decomposition method to find the optimum solution. Then, the general formulation is used specifically for transportation systems to find the optimal retrofit decisions for bridges.
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Quantitative risk assessment in drill casing design for oil and gas wells
In the oil and gas industry the use of a reliability based design is becoming increasingly important because of the increasingly requirements for safety and economy. In contrast to the traditional working stress design (WSD), Quantitative Risk Assessment (QRA) provides the methodology for …
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Reliability Analysis of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Steel Beams
… techniques used to produce the joints. Reliability analysis of adhesively bonded CFRP-to-steel double-lap shear (DLS) joints with thin outer adherends was performed first, to study the bond behavior when dominated by adhesive shear stresses. A comprehensive experimental database of the …
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Reliability-Based Topology Optimization with Analytic Sensitivities
… it may have a design which is too conservative. Reliability-Based Design Optimization (RBDO) is an alternative approach which directly considers the likelihood of failure by incorporating a reliability analysis step such as the First-Order Reliability Method (FORM). The FORM analysis requires the …
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Time-dependent reliability methodologies with saddlepoint approximation
… properties and time-variant loads. Therefore the reliability of engineering systems becomes time-dependent. It is crucial to predict the time-dependent reliability in the design stage, given possible catastrophic consequences of a failure. Although extensive research has been conducted on …
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Segmental multi-point linearization for topology optimization and reliability analysis
… gradient-based optimization algorithm to solve reliability-based topology optimization (RBTO) of structures under loading and material uncertainties. Topology optimization is a powerful design tool as it can provide the most efficient material layout for structural design problems under given …
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An efficient technique for structural reliability with applications
An efficient reliability technique has been developed based on Response Surface Methodology (RSM) in conjunction with the First Order Second Moment (FOSM) reliability method. The technique is applied when the limit state function cannot be obtained explicitly in terms of the design variables, i.e., …
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H2 Control for Improved Stability of Multi-area Electric Power System with High Levels of Inverter-Based Generation
… This research develops a systematic three-step method of assessing the reliability of electric power systems under a variety of different possible fault conditions to ensure that overall system stability is preserved in a manner the meets regulatory requirements. The first step is a risk-based …
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Probabilistic Analysis of a Thin-walled Beam with a Crack
It is reasonable to assume that an aircraft might experience some in-flight discrete source damage caused by various incidents. It is, thus, necessary to evaluate the impact of such damage on the performance of the aircraft. This study is focused on evaluating the effect of a simple discrete damage …
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Shear Reliability Analysis of Reinforced Concrete Bridges Designed to TMH7
… in question. This study investigates the shear reliability performance of TMH7 using heavy vehicle weigh-in-motion (WIM) data. The study is limited to normal traffic conditions and single-span reinforced concrete bridges. Reliability analyses were performed for two case studies: First case study …
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System reliability analysis of structures subjected to fatigue induced sequential failures using evolutionary algorithms
… leading to system collapse. With proper system reliability analysis, such cascading failures could be foreseen by stakeholders. To help make better risk-informed decisions, system reliability methods have been developed to analyze general structures subjected to the risk of cascading …
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