Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains viii, 127 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 123-126).

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Coiler drums are integral components of the Steckel mill reversing hot strip rolling process. A Steckel mill produces hot rolled strip steel from cast slabs, which are heated before being converted, via roughing, to a transfer bar, of which the thickness is subsequently reduced to the desired gauge by means of a reverse rolling process performed by the Steckel mill. Coiler drums are located inside two Steckel furnaces, which are positioned on both sides of the mill stand. As the strip thickness is reduced during each pass, the length increases. In order to obtain high rolling speeds and retain temperature, the strip is successively coiled and uncoiled, under tension, onto and from the heated coiler drums during processing. As coiler drums have a high unit cost and a significant impact on the quality of the finished product, coiler drum performance is important to Steckel mill operators. The high cost is associated with the high alloy composition of the casting and the specialised manufacturing process required for the production of coiler drums. Deterioration of the coiler drum condition over its service lifespan can adversely affect the quality of the final product, namely coiled strip. This investigation was therefore undertaken to gain insight into coiler drum failure mechanisms, which will benefit Steckel mill operators, mill suppliers and coiler drum suppliers. / Professor R.F. Laubscher

The equations of motion for a satellite with a rigid central body and a pair of appendages deforming due to thermal effects of the solar radiation are derived. The dynamics of the system is studied in two stages: (i) librational dynamics of the central body with quasi-steady thermally flexed appendages; (ii) coupled librational/vibrational dynamics of the spacecraft. Response of the system is investigated numerically over a range of system parameters and effect of the thermal deformations assessed. The study indicates that for a circular orbit, the flexible system can become unstable under critical combinations of system parameters and initial conditions although the corresponding rigid system continues to be stable. However, in eccentric orbits, depending on the initial conditions, thermally flexed appendages can stabilize or destabliIize the system. Attempt is also made to obtain an approximate closed-form (analytical) solution of the problem to quickly assess trends and gain better physical appreciation of response characteristics during the preliminary design. Comparisons with numerical results show approximate analysis to be of an acceptable accuracy for the intended objective. The closed-form solution can be used with a measure of confidence thus promising a substantial saving in time, effort, and computational cost. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

In a nuclear power plant, the last barrier under normal and accident operations is the containment building. This is normally constructed from concrete reinforced with steel bars, which are prestressed to enhance the overall capability to withstand thermodynamic stresses like over-pressurisation and high temperatures. The failure of this final barrier will lead to the release of radioactivity to the surrounding environment. To examine the effects of thermo-hydraulic stresses on PWR containment following a LOCA, a model is proposed with simulated scenarios performed at the Koeberg Nuclear Power Station as a case study. The accidents were simulated using the Koeberg engineering simulator to obtain the output data. The scenario for the proposed model correlates the critical mass flow from a double-ended guillotine break to the containment pressure and temperature increase. Different containment filtered venting systems (CFVS) are also investigated in this study as severe accident management systems. CFVS have historically been included in boiling water reactor (BWR) designs, but following the Fukushima Daiichi nuclear accident, they are being introduced as severe accident management systems to manage the threat of containment over-pressurisation in pressurised water reactors (PWR). Finally, the rate of change in containment pressure and temperature is analysed and compared to literature, with the incorporation of a simulated filtered venting system to the PWR containment building.

Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1979 / Bibliography: leaves 204-212. / by Peter Michael Switchenko. / M.S. / M.S. Massachusetts Institute of Technology, Department of Mechanical Engineering

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The problem of this study was to determine if a difference in core body temperature and degree of dehydration exists between able-bodied athletes and wheelchair athletes in response to prolonged aerobic exercise while under thermal stress. Eight subjects, four able-bodied and four wheelchair athletes, volunteered to take part in the study. All subjects performed a 60-minute bout of upper body exercise while subjected to a temperature of 33- 34·c. Core body temperature, heart rate and degree of dehydration were all measured during and after testing, providing three dependent variables: the time that it took to achieve a maximum core body temperature (Time to Max Temp.), the difference between pre-weight and post-weight after the 60 minute bout of exercise (Weight Diff.) and the maximum temperature achieved during the 60 minute bout of exercise (Temp. Diff.). A multivariate factorial design (MANOVA) was used to examine group differences across all dependent variables simultaneously. No significant differences were observed between groups (p>.05). The results of this study may indicate that wheelchair athletes are no more susceptible to elevated core body temperatures or dehydration during aerobic exercise than able-bodled athletes. If this is the case, wheelchair athletes may need only to take the same precautions during aerobic exercise while under thermal stress as their able-bodied counterparts.