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 96 for “"reliability-based"”.
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Reliability-Based Groundwater Monitoring System Design
Detection monitoring systems composed of a single row of wells at different spacing and different distances from the contaminant source were evaluated. It is shown that, out of these systems, the optimal detection system is composed of closely spaced wells located near the source of contaminants. …
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Reliability-based optimization of rail inspection
… have evolved the rail inspection interval based on their empirical judgement and on field data. A crack size is predicted by linear elastic fracture mechanics (LEFM). The proposed method identifies the time-varying rail reliability due to deterioration, using data obtained from LEFM and …
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Reliability-based design of tunnel support systems
Recent developments of tunnelling technology have led to the construction of many tunnels, not only in rural areas, but also in cities. In particular, tunnel construction in cities requires very high standards of safety, since failure can cause the loss of many human lives as well as damage of …
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Reliability-based design of a retaining wall
… optimum design of a retaining wall by using the reliability theory. Typical gravity retaining walls with four different heights were selected in this study. The walls were designed first to satisfy the conventional design criteria, and later the safety indices inherent in the walls were computed …
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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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A reliability-based method for optimization programming problems
… to both linear and nonlinear optimization. Based on a proper linearization, a set of probabilistic constraints (performance functions) can be transformed into a corresponding set of deterministic constraints. this is accomplish by expanding all the constraints about the most probable failure …
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Reliability based criteria for cold-formed steel members
… in the United States, the concepts of risk and reliability analysis have been successfully applied to the Load and Resistance Factor Design criteria for steel buildings using hot-rolled shapes, and built-up members fabricated from steel plates.</p> <p>In order to develop reliability based design …
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RELIABILITY-BASED MODELING FOR MISSOURI RIVER DAM SYSTEM
… simulation method was applied to develop a reliability-based model to study the system performance. Our approach incorporates different sources of uncertainty, including failure probability of components such as turbines and spillway gate facilities. This model allowed us to evaluate the …
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System Reliability-Based Design and Multiresolution Topology Optimization
… to introduce an efficient and accurate system reliability-based design optimization (SRBDO) procedure; and (3) to investigate the reliability-based topology optimization (RBTO) problem. First, it is noted that the material distribution method often requires a large number of design variables, …
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Reliability-based analysis and design of 2D trusses
… quantify the uncertainty in a structure we use reliability-based methods to analyze a 2D truss. This study first explores various types of methods used to calculate the reliability of an element to develop an automated analysis program. After finding the best methods needed for an accurate …
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Reliability-Based Design Optimization of Nonlinear Beam-Columns
… ultimate strength, structural optimization and reliability analysis using ultimate strength analysis, and Reliability-Based Design Optimization (RBDO) of the nonlinear beam-columns. The ultimate strength analysis is based on nonlinear beam theory with material and geometric nonlinearities. …
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A reliability based design procedure for wood pallets
… a need for a rational design methodology, based upon engineering principles, to ensure consistent safety and economy in pallets of any geometry. To satisfy this need a cooperative research project between Virginia Tech, the U. S. Forest Service, and the National Wooden Pallet and Container …
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Reliability-Based Structural Optimization Under Stochastic Time Varying Loads
A methodology for reliability-based structural optimization under time varying random loadings with emphasis on realistic modeling of the loadings and the effect of uncertainties of loadings on the design is developed. It includes studies on optimization problem formulation, loading modeling, …
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Hybrid adaptive sequential sampling for reliability-based design optimization
To reduce the cost for reliability analysis and optimization of complex engineering systems, surrogate models can be used to replace expensive physical models. One of the critical tasks of employing surrogate models for system design optimization is to develop an accurate surrogate model …
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Optimal reliability-based design of bulk water supply systems
… a stochastic analysis method that allowed the reliability of a reservoir to be estimated based on a Monte Carlo analysis of consumer demand, fire water demand and pipe failures. Van Zyl et al. (2008) developed this method further and proposed a design criterion of one failure in ten years under …
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Reliability based analysis of the crosswind stability of railway vehicles
Die Seitenwindstabilität spielt heutzutage eine entscheidende Rolle im Zulassungsverfahren von Schienenfahrzeugen und wird oft zur zentralen Randbedingung im Entwurfsprozess. In vielen Ländern, einschließlich Deutschland, basiert der Sicherheitsnachweis auf der numerischen Simulation des …
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Contributions in Uncertainty Quantification Towards Reliability-based Rock Engineering Design
This thesis contributes to two distinct but related problems in contemporary rock engineering design which arise in the context of developing limit states design (LSD) protocols. In doing so, it identifies the discrepancies between geotechnical limit states design standards and customary rock …
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Design and reliability-based optimization of the piezoelectric flex transducer
… The optimization uses both conventional and reliability-based optimization approaches in order to improve the electrical power generation from the device. First, the piezoelectric flex transducer is modeled by using the finite element method with the finite element analysis software ANSYS …
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Risk and reliability-based maintenance for highway infrastructure asset management
… pressing need of methods that would enable the reliability and maintainability of their fielded system. The availability and safety of highway infrastructure is a primary objective of an economy in other to provide a satisfactory level of service to road users and overcome the practical …
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Analysis and Reliability-Based Design of Columns With Random Parameters
Made available in DSpace on 2015-05-12T22:37:15Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7219932.PDF: 6352650 bytes, checksum: bc8a28e906258258c801ceac4ea1f74e (MD5) Previous issue date: 1972
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