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 18 of 18 for “"Degradation Models"”.
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Integrated degradation models for polymer matrix composites
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Performance Analysis and Strategic Management of Longitudinal Pavement Markings
… marking performance and developed useful degradation models for paint pavement markings which can help transportation agencies meet the pending FHWA minimum retroreflectivity requirements. The impacts of several important factors (such as directionality, pavement type and roughness) on …
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Reliability analysis of complex systems with long memory effects
… and health management, reliability analysis and degradation models are crucial for predicting the lifetime of complex systems. Recent studies have highlighted the significance of Long-Term Memory (LTM) effects in degradation processes, where future behaviors are strongly coupled with historical …
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Optimization of Pavement Marking Performance
… and visual rating. From the collected data, degradation models were created using exponential models presented in the literature. The degradation models were implemented by using practical methods for assessing pavement marking retroreflectivity and costs. The methods presented in this paper …
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Health conscious energy management strategies for fuel cell/battery hybrid vehicles
… Thus it is important to study the effects of degradation when designing fuel cell/battery hybrid vehicles. We have collected test data from the University of Delaware’s latest fuel cell bus by implementing two-way on-board communication systems. A vehicle model was built in MATLAB based on the …
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Analysis of Factors Affecting Pavement Markings and Pavement Marking Retroreflectivity in Tennessee Highways
… retroreflectivity are analyzed, and linear degradation models are developed using regression analysis. The analysis shows that age and traffic have significant impacts on pavement marking retroreflectivity degradation.
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Electrical conduction transport mechanisms of barium titanate- based multilayer ceramic capacitors
… polarization current, DC conduction current and degradation current. The polarization current decreases with time as a power law relation, i.e. Ic(t) t-m where the exponent value m is strongly dependent on the type of capacitor and temperature, but is only weakly dependent on the applied voltage. …
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Degradation Analysis for Heterogeneous Data Using Mixture Model
… about reliability of the products. If a degradation measure that is closely related to failure can be monitored, degradation analysis, as an alternative to the failure time analysis, may lead to improved reliability inference and provide additional information related to the failure …
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Probabilistic aspects of progressive damage in composite structures
… and threedimensional finite element models are used to obtain stress fields. In-plane damage is simulated by setting in-plane elastic constants of damaged elements effectively to zero. Out-of-plane damage is simulated by setting out-of-plane elastic constants of elements in adjacent …
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Modeling the post shear failure behavior of reinforced concrete columns
… failure and subsequent lateral shear strength degradation have occurred. Therefore, column shear failure and degrading behavior must be modeled accurately before axial collapse algorithms can be properly implemented. Furthermore, accurate modeling of the degrading lateral-load behavior of …
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Railroad decision support tools for track maintenance
… integrated approach is needed that incorporates degradation modeling, project selection, and maintenance scheduling for the entire track structure. Planning track maintenance in this way allows for the effects of changing maintenance timing to be seen explicitly through the disruption risk while …
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Space radiation environment impacts on high power amplifiers and solar cells on-board geostationary communications satellites
… measurements, we calculated both on-orbit degradation of Si and GaAs solar cells in an annual average sense, and also quantified the degradation of cells during severe solar proton events (SPEs) of 10 MeV protons > 10,000 pfu. A functional relationship between the amount of degradation and …
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An Examination of Site Response in Columbia, South Carolina: Sensitivity of Site Response to "Rock" Input Motion and the Utility of Vs(30)
… response spectra. Site specific subsurface models are developed for four sites in and near Columbia, South Carolina using shear wave velocity measurements from cone penetrometer tests. The four sites are underlain by thin coastal plain sedimentary deposits, overlying high velocity Paleozoic …
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Prognostics and health management for multi-component systems
… and more of a challenge, especially due to their degradation processes becoming highly stochastic in nature. This thesis is concerned with the prognostics and health management (PHM) of such complex multi-component systems, whereby signal processing and health indicator extraction, diagnostics, …
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Physical, mechanical and durability properties of sugarcane ash enhanced compressed earth blocks stabilized with fly ash and lime powder
… by DMA, SEM, XRD, FTIR, DSC and TGA. Three degradation models, Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (OFW), and Kissinger (KGR) methods were employed to determine apparent activation energy values of untreated SCB and SW, and their respective celluloses. The apparent activation …
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City-scale eco-routing and pavement eco-maintenance scheduling for CO2 mitigation
… management perspective, a city-scale pavement degradation model is built and utilised in testing pavement maintenance scenarios. San Francisco is chosen as the case study area due to the availability of various traffic mobility and infrastructure condition data. In Chapter 3 of the thesis, the …
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Maximizing nuclear power plant performance via mega-uprates and subsequent license renewal
… power uprate and life extension to: 1) plant degradation models and data; 2) technological readiness of high-performance plant components and systems; 3) experience with large power uprates; 4) cost uncertainties due to market conditions and technology risk; and 5) future energy prices. …
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Service Life Assessment of Harbor Structures - Case studies of chloride ingress into concrete and sheet piling corrosion rates
… often have cap beams of reinforced concrete. The degradation processes of these structures must be taken into account both when designing new structures and when inspecting existing harbor structures with the purpose of determining their remaining service life. Since the environmental loads on …