Дисертації з теми "Blunt body"
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Dominy, Robert Gerald. "Rarefied hypersonic shock wave and blunt body flows." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47034.
Повний текст джерелаCastledine, Andre J. "Investigation of the fluid flow around blunt body samplers." Thesis, University of Leeds, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305756.
Повний текст джерелаEss, Peter. "Numerical simulation of blunt body-generated detonation wave ramjet flowfields." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0019/MQ45873.pdf.
Повний текст джерелаJain, Sunny. "Hypersonic nonequilibrium flow simulations over a blunt body using bgk simulations." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2406.
Повний текст джерелаEss, Peter. "Numerical simulation of blunt-body generated detonation waves in viscous hypersonic ducted flows." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288263.
Повний текст джерелаJohnson, Joshua E. "Multidisciplinary optimization of non-spherical, blunt-body heat shields for a planetary entry vehicle." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3766.
Повний текст джерелаThesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Johnson, Joshua E. "Aerothermodynamic optimization of earth entry blunt body heat shields for lunar and Mars return." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9177.
Повний текст джерелаThesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Aubuchon, Vanessa V. "Damping Effects of Drogue Parachutes on Orion Crew Module Dynamics." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23327.
Повний текст джерелаA forced oscillation test of the CM with parachutes was conducted in the NASA LaRC 20-Ft Vertical Spin Tunnel (VST) to gather additional data to validate and refine the Apollo legacy drogue model. A second loads balance was added to the original Orion VST model to measure the drogue parachute loads independently of the CM. The objective of the test was to identify the contribution of the drogues to CM damping and provide additional information to quantify wake effects and the interactions between the CM and parachutes. The drogue parachute force vector was shown to be highly dependent on the CM wake characteristics. Based on these wind tunnel test data, the Apollo Legacy Chute Damping model was determined to be a sufficient approximation of the parachute dynamics in relationship to the CM dynamics for preliminary entry vehicle system design. More wake effects should be included to better model the system. These results are being used to improve simulation model fidelity of CM flight with drogues deployed, which has been identified by the project as key to a successful Orion Critical Design Review.
Master of Science
Kurits, Inna. "Quantitative global heat-transfer measurements using temperaure-sensitive [sic] paint on a blunt body in hypersonic flows." College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8302.
Повний текст джерелаThesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Pinn, Jarred Michael. "Effect of End-Plate Tabs on Drag Reduction of a 3D Bluff Body with a Blunt Base." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/698.
Повний текст джерелаErlhoff, Ethan Bruce. "Distributed Forcing on a 3D Bluff Body with a Blunt Base, An Experimental Active Drag Control Approach." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/879.
Повний текст джерелаSevier, Abigail. "Feasibility Study for Testing the Dynamic Stability of Blunt Bodies with a Magnetic Suspension System in a Supersonic Wind Tunnel." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1493207020743959.
Повний текст джерелаChen, Ru-Ching. "Development of a Supersonic Nozzle and Test Section for use with a Magnetic Suspension System for Re-Entry Aeroshell Models." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1544179612537658.
Повний текст джерелаBracq, Anthony. "Contribution à la prédiction du risque lésionnel thoracique lors de chocs localisés à travers la caractérisation et la modélisation d'impacts balistiques non pénétrants." Thesis, Valenciennes, 2018. http://www.theses.fr/2018VALE0019/document.
Повний текст джерелаFor decades, the assessment of less-lethal weapons (LLW) and bulletproof vests has generated major interest from law enforcement agencies around the world. Indeed, these presumed less-lethal or non-lethal weapons are required to cause only significant pain to an individual to ensure their neutralization. Bulletproof vests, in turn, must provide a certain level of protection to reduce the risk of trauma related to their dynamic deformation. The Center for Research, Expertise and Logistics Support (CREL) of the French Ministry of the Interior aims to develop a tool to predict thoracic injury risk during non-penetrating ballistic impacts. It would therefore be possible to evaluate the performance of LLW and bulletproof vests before their deployment in operations. More precisely, this method must only be based on the direct measurement of the dynamic process of deformation of a synthetic gel block subjected to a ballistic impact. To address that issue, the numerical approach is considered in this thesis by the use of the human thorax dummy HUByx as an intermediate tool for the determination of transfer functions between experimental metrics on a gel block and the risk of injury. The reproduction of real impact conditions on HUByx thus requires the characterization and modeling of less-lethal projectiles as well as projectiles of firearms and bulletproof vests. They rely on an inverse method identification procedure applied to the Taylor test for modeling LLW and on the analysis of blunt impacts on the gel block for projectiles/bulletproof vests. Work is then dedicated to the mechanical characterization and modeling of the synthetic gel under dynamic loadings. Finally, a statistical approach based on correlation analyses is introduced using both experimental measurements, numerical data as well as case reports from the literature. A thorax mapping associated with the risk of rib fractures is established and only depends on an experimental metric
Meljordshagen, von Ubisch Ann Kristin. "BMI og sosiodemografiske faktorers påvirkning på operative forløsninger blant Norske og Pakistanske kvinner i Groruddalen, Norge." Thesis, Nordic School of Public Health NHV, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:norden:org:diva-3326.
Повний текст джерелаBackground: Elevated body mass index(BMI) and increased immigration pose challenges that demand a new focus on health inequalities for mothers and children. Currently, Pakistani immigrants are among the largest minority groups in Norway.This study aimed to determine the prevalence of pre-pregnancy BMI and the impact of different sociodemographic factors on operative (caesarean section, vacuum and forceps) deliveries among Norwegian and Pakistani nulliparous women in Groruddalen, Norway. Methods: This population-based cohort study included 146 Norwegian and 39 Pakistani women attending Child Health Clinics in Groruddalen and delivering at Oslo University Hospital and Ullevål and Akershus University Hospital, Norway. Results: Compared to Norwegian women, pre-pregnancy BMI was lower in Pakistani women (24.6 and 22.1, respectively; p < .05). Further, education level was > 9 years lower in Pakistani versus Norwegian women (79.5 % and 96.6 %, respectively; p < .05) and fewer Pakistani women work outside the home (66.5 % and 95.2 %, respectively; p < .05). Compared to Norwegian women (M = 29.7 years, SD = 4.4 years, p <.05), Pakistani women were younger (M = 26.4 years, SD = 4.0 years) when they delivered their first child. Moreover, Pakistani infants weighed 339 g less (average birth-weight = 3181 g) compared to Norwegian infants (3520 g; p< 0.05). We observed no significant difference in operative delivery among the Pakistaniversus Norwegian women (31.6 % and 27.9 %, respectively; p = 0.805). Regardless of ethnicity, variable maternal age (OR=1.106 [CI 95: 1.017 to 1.203]) and gestational age (OR=0.951 [CI 95: 0.908 to 0.997]) associated with operative delivery in this study.Newborn weight (OR=1.001 [CI 95: 1.000 to 1.002]) was considered borderline. Conclusion: This study revealedsociodemographic differences between Norwegian and Pakistani women undergoing operative delivery in Groruddalen, Norway. Compared to Norwegian women, Pakistani women had lower BMI and lower educational attainment. Fewer Pakistani women worked outside the home and they were younger when they delivered theirfirst child. Additionally, the birth weight of Pakistani babies delivered was lower than Norwegian newborns. We observed no difference in the proportion of operative deliveries between Norwegian and Pakistani women. Regardless of ethnicity, women’s chronological and gestational age affect operative delivery.
ISBN 978-91-86739-64-5
Grønning, Stølen Svanhild Bjørg. "Inntakav vanlig brusog lettbrus og insidens av diabetes type 2 blant adventister i Nord-Amerika." Thesis, Nordic School of Public Health NHV, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:norden:org:diva-3634.
Повний текст джерелаBackground: Diabetes is increasing globally,presenting a growing public health problem. The rapid rise of obesity, physical inactivity, and an increasinglyelderly populationcontribute to this epidemic. The increase in obesity and diabetes coincide with increased intake of sugary and artificially sweetened drinks. Aim: This study aimed to investigate whether the consumption of regularor diet soft drinks predicts the incidence of type2 diabetes. Method: We used data collected from the Adventist Health Study-2, a prospective cohort study. The data was based on a baseline questionnaire, as well as a follow-up form (i.e., hospital history form-3) distributed to previous respondents up to 6 years later. Both questionnaire and follow-upformasked about a possible diabetes diagnosis and date of diagnosis. Importantly, Adventist Health Study-2 excluded individiuals who presented with diabetes at baseline. Among 45,777 subjects, the study detected 1,277 new cases of diabetes. Analyses were conducted both with and without body mass index. Complementary log-log Cox analysis was used to calculate hazard ratios(HR)and corresponding 95% confidence intervals. Results: Adjusted for demographic variables, body mass index, type of diet, physical activity, and fiber and magnesiumintake, multvariateanalysis showed that consumptionof ≥1 can (355 ml) of diet soda/day was associated with the incidence of type 2 diabetes (HR=1.46, 95% CI, 1.19 to 1.73;p<0.001). In comparison,consumptionof ≥ 1 can of regular soda/daydid not increaserisk of diabetes (HR = 1.20, 95% CI, 0.95 to 1.50). The associations were strengthened and statistically significant for both types of soda when not adjusted for BMI. Other risk factors for developing diabetes included age, male gender, non-white ethnicity, and body mass index. High intake of magnesiumandfiber, higher education,and a vegetarian diet were protective against the disease. Conclusion: Consumption of diet soda was significantly associated with the development of type 2 diabetes.
ISBN 978-91-982282-0-5
Lin, Ching-ming, and 林慶銘. "Hypersonic Flow for Spiked Blunt-body with Vortex-ring." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/10592347946583881391.
Повний текст джерела國立中央大學
機械工程學系
84
The technique of numerical method for simulating thehypersonic flow field of spiked blunt body with vortex-ring was studied in this work. The main numerical methodused here was finite volume method with TVD scheme andelliptic type body- fitted coordinate system. The resultshown that the vortex-ring will effect the flow field ofspiked blunt body and different ring-position will causedifferent flow type.
Farzan, Farnaz. "Interaction of microwave filaments and blunt body in supersonic flow." 2008. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17467.
Повний текст джерелаSatheesh, K. "The Effect Of Energy Deposition In Hypersonic Blunt Body Flow Field." Thesis, 2007. http://hdl.handle.net/2005/881.
Повний текст джерелаAnderson, Kellie. "Interaction of heated filaments with a blunt body in supersonic flow." 2010. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000052093.
Повний текст джерела"Aerothermodynamic optimization of Earth entry blunt body heat shields for Lunar and Mars return." UNIVERSITY OF MARYLAND, COLLEGE PARK, 2009. http://pqdtopen.proquest.com/#viewpdf?dispub=3359388.
Повний текст джерелаLeibowitz, Matthew Gregory. "Hypervelocity Shock Tunnel Studies of Blunt Body Aerothermodynamics in Carbon Dioxide for Mars Entry." Thesis, 2020. https://thesis.library.caltech.edu/13726/8/FINAL_Leibowitz_Dissertation_05_27_20.pdf.
Повний текст джерелаA low mass and reliable thermal protection system for Martian atmospheric entry requires an accurate prediction of the aerothermal environment encountered by the spacecraft. In order to move forward with predictive models for larger vehicles needed for manned and sample return missions, anomalous data needs to be resolved. This work aims to address two critical problems relevant for Mars missions.
I) We investigate significant discrepancies between experimental and simulated blunt body bow shock standoff distance in ground test facilities. Experiments using high-speed and high-resolution schlieren imaging are conducted in the T5 reflected shock tunnel and the Hypervelocity Expansion Tube (HET) to examine facility independence of the measurements. A recently-developed model for sphere and sphere-cone behavior is in good agreement with experiments, and with predictions from Navier-Stokes simulations with thermal and chemical nonequilibrium. The need to account for the divergence of the streamlines in conical nozzles is highlighted. The contributions of vibrational and chemical nonequilibrium to the stagnation-line density profile are quantified using the simulation results in order to compare different reaction rate models.
II) We measure and characterize carbon dioxide mid-wave infrared radiation in hypervelocity flow. Initially assumed negligible in the design of the Mars Science Laboratory (MSL) mission heat shield, this mechanism of heating must be considered for accurate predictions of the heating environment. Specifically, carbon dioxide radiation can be a dominant source of heating in the afterbody, particularly later in the trajectory at lower velocities. Presented are spectral measurements of the 4.3 μm fundamental band of carbon dioxide radiation measured using fiber optics embedded on the surface of an MSL scaled heat shield model. When comparing experiments and simulations, good agreement is found when running the HET in shock tube mode where the shock layer is optically thick, while discrepancies are observed in expansion tube mode where the shock layer is optically thin. A thorough analysis of flow features in the line-of-sight including freestream uncertainties is performed to explore possible reasons for this discrepancy. After developing the spectroscopic calibration technique and obtaining forebody measurements in the expansion tube, an experimental campaign is completed in the T5 Reflected Shock Tunnel to measure spectral radiation in the forebody and afterbody. The accompanying T5 simulations needed for radiation predictions are being carried out by NASA Ames.
Brooks, Gregory P. "A Karhunen-Loève least-squares technique for optimization of geometry of a blunt body in supersonic flow." 2003. http://etd.nd.edu/ETD-db/theses/available/etd-05062003-110151/.
Повний текст джерелаThesis directed by Joseph M. Powers for the Department of Aerospace and Mechanical Engineering. "June 2003." Includes bibliographical references (leaves 148-152).
Chu, Kuan-Yu, and 朱冠宇. "Analysis of Aero Dynamic-Heating and Drag of Hypersonic Flows over A 3-D Blunt Body at Angle of Attack." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/14771151169314432711.
Повний текст джерела