Aircraft configuration optimization including optimized flight profiles

The Flight Optimization System (FLOPS) is an aircraft configuration optimization program developed for use in conceptual design of new aircraft and in the assessment of the impact of advanced technology. The modular makeup of the program is illustrated. It contains modules for preliminary weights estimation, preliminary aerodynamics, detailed mission performance, takeoff and landing, and execution control. An optimization module is used to drive the overall design and in defining optimized profiles in the mission performance. Propulsion data, usually received from engine manufacturers, are used in both the mission performance and the takeoff and landing analyses. Although executed as a single in-core program, the modules are stored separately so that the user may select the appropriate modules (e.g., fighter weights versus transport weights) or leave out modules that are not needed

The Ballad of the Sad Café

Edited by Beatriz Ribeir

Hybrid Wing Body Configuration System Studies

The objective of this study was to develop a hybrid wing body (HWB) sizing and analysis capability, apply that capability to estimate the fuel burn potential for an HWB concept, and identify associated technology requirements. An advanced tube with wings concept was also developed for comparison purposes. NASA s Flight Optimization System (FLOPS) conceptual aircraft sizing and synthesis software was modified to enable the sizing and analysis of HWB concepts. The noncircular pressurized centerbody of the HWB concept was modeled, and several options were created for defining the outboard wing sections. Weight and drag estimation routines were modified to accommodate the unique aspects of an HWB configuration. The resulting capability was then utilized to model a proprietary Boeing blended wing body (BWB) concept for comparison purposes. FLOPS predicted approximately a 15 percent greater drag, mainly caused by differences in compressibility drag estimation, and approximately a 5 percent greater takeoff gross weight, mainly caused by the additional fuel required, as compared with the Boeing data. Next, a 777-like reference vehicle was modeled in FLOPS and calibrated to published Boeing performance data; the same mission definition was used to size an HWB in FLOPS. Advanced airframe and propulsion technology assumptions were applied to the HWB to develop an estimate for potential fuel burn savings from such a concept. The same technology assumptions, where applicable, were then applied to an advanced tube-with-wings concept. The HWB concept had a 39 percent lower block fuel burn than the reference vehicle and a 12 percent lower block fuel burn than the advanced tube-with-wings configuration. However, this fuel burn advantage is partially derived from assuming the high-risk technology of embedded engines with boundary-layer-ingesting inlets. The HWB concept does have the potential for significantly reduced noise as a result of the shielding advantages that are inherent with an over-body engine installation

Wunderkind

Edited by Beatriz Ribeir

The Flight Optimization System Weights Estimation Method

FLOPS has been the primary aircraft synthesis software used by the Aeronautics Systems Analysis Branch at NASA Langley Research Center. It was created for rapid conceptual aircraft design and advanced technology impact assessments. FLOPS is a single computer program that includes weights estimation, aerodynamics estimation, engine cycle analysis, propulsion data scaling and interpolation, detailed mission performance analysis, takeoff and landing performance analysis, noise footprint estimation, and cost analysis. It is well known as a baseline and common denominator for aircraft design studies. FLOPS is capable of calibrating a model to known aircraft data, making it useful for new aircraft and modifications to existing aircraft. The weight estimation method in FLOPS is known to be of high fidelity for conventional tube with wing aircraft and a substantial amount of effort went into its development. This report serves as a comprehensive documentation of the FLOPS weight estimation method. The development process is presented with the weight estimation process

Structural design studies of a supersonic cruise arrow wing configuration

Structural member cross sections were sized with a system of integrated computer programs to satisfy strength and flutter design requirements for several variants of the arrow wing supersonic cruise vehicle. The resulting structural weights provide a measure of the structural efficiency of the planform geometry, structural layout, type of construction, and type of material including composites. The material distribution was determined for a baseline metallic structure and the results indicate that an approximate fatigue constraint has an important effect on the structural weight required for strength but, in all cases, additional material had to be added to satisfy flutter requirements with lighter mass engines with minimum fuel onboard. The use of composite materials on the baseline configuration was explored and indicated increased structural efficiency. In the strength sizing, the all-composite construction provided a lower weight design than the hybrid construction which contained composites only in the wing cover skins. Subsequent flutter analyses indicated a corresponding lower flutter speed

Does Glycosylation as a modifier of Original Antigenic Sin explain the case age distribution and unusual toxicity in pandemic novel H1N1 influenza?

Background: A pandemic novel H1N1 swine-origin influenza virus has emerged. Most recently the World Health Organization has announced that in a country-dependent fashion, up to 15% of cases may require hospitalization, often including respiratory support. It is now clear that healthy children and young adults are disproportionately affected, most unusually among those with severe respiratory disease without underlying conditions. One possible explanation for this case age distribution is the doctrine of Original Antigenic Sin, i.e., novel H1N1 may be antigenically similar to H1N1 viruses that circulated at an earlier time. Persons whose first exposure to influenza viruses was to such similar viruses would be relatively immune. However, this principle is not sufficient to explain the graded susceptibility between ages 20 and 60, the reduced susceptibility in children below age 10, and the unusual toxicity observed.Methods: We collected case data from 11 countries, about 60% of all cases reported through mid-July 2009. We compared sequence data for the hemagglutinin of novel H1N1 with sequences of H1N1 viruses from 1918 to the present. We searched for sequence differences that imply loss of antigenicity either directly through amino acid substitution or by the appearance of sites for potential glycosylation proximal to sites known to be antigenic in humans. We also considered T-cell epitopes.Results: In our composite, over 75% of confirmed cases of novel H1N1 occurred in persons ≤ 30 years old, with peak incidence in the age range 10-19 years. Less than 3% of cases occurred in persons over 65, with a gradation in incidence between ages 20 and 60 years.The sequence data indicates that novel H1N1 is most similar to H1N1 viruses that circulated before 1943. Novel H1N1 lacks glycosylation sites on the globular head of hemagglutinin (HA1) near antigenic regions, a pattern shared with the 1918 pandemic strain and H1N1 viruses that circulated until the early 1940s. Later H1N1 viruses progressively added new glycosylation sites likely to shield antigenic epitopes, while T-cell epitopes were relatively unchanged.Conclusions: In this evolutionary context, Original Antigenic Sin exposure should produce an immune response increasingly mismatched to novel H1N1 in progressively younger persons. We suggest that it is this mismatch that produces both the gradation in susceptibility and the unusual toxicity. Several murine studies suggest specific cell types as a likely basis of the unusual toxicity. These studies also point to widely available pharmaceutical agents as plausible candidates for mitigating the toxic effects. The principle of Original Antigenic Sin modified by glycosylation appears to explain both the case age distribution and the unusual toxicity pattern of the novel H1N1 pandemic. In addition, it suggests pharmaceutical agents for immediate investigation for mitigation potential, and provides strategic guidance for the distribution of pandemic mitigation resources of all types. © 2010 Reichert et al; licensee BioMed Central Ltd.published_or_final_versio

PEER SUPPORTS ACROSS INCLUSIVE ENVIRONMENTS

Peer-mediated interventions provide opportunities for students with disabilities to learn a variety of different skills and meet individualized goals. Peers can provide targeted social, behavioral, and academic supports to students with moderate and severe disabilities. One specific peer-mediated intervention is peer support arrangements. These interventions involve providing supports to students with disabilities in inclusive classrooms or other instructional contexts. These supports contain four key components: selection of students, training of peers, peer delivery of supports, and adult monitoring. When implemented with fidelity, peer support arrangements provide numerous benefits to both students with and without disabilities

A Seat At The Table: The Unspoken Values And Benefits Of Student And Academic Affairs Collaboration And Partnerships In Higher Education

After almost two semesters as a graduate student at the University of Vermont, I decided that I wanted to do more in my second year of graduate school. It was through conversations with my colleagues that I determined that stepping out of my comfort zone of student affairs and looking into academic affairs would help develop me as not only a student affairs professional but as an educator as well. During the fall semester of 2016, I participated in an independent study where I served as a Teaching Assistant for a university diversity requirement course titled “The Political Economy of Race”. For this course I worked directly with a faculty member in the Department of Economics to cultivate a holistic classroom experience for the students in the course. Throughout the course of the semester, I was able to witness many different dynamics that were helpful to not only the students but to the professionals in the room as well. Upon completing the semester, I determined that I wanted to do more research and explore the benefits of collaborative partnerships between faculty and staff on college campuses; my focus for this research was to be around partnerships between professionals in student affairs and academic affairs. Although there has not been a lot of research around this particular topic in Higher Education, it is beginning to be studied as colleges and universities are expected to produce more valuable experiences for students. Through both research and experiential learning, I have found that there are benefits to collaborative partnerships between academic and student affairs in Higher Education as well as drawbacks to these partnerships. I have also made recommendations for future collaborative projects between faculty and staff as well as recommendations for future research in this area. Overall, there is value in the collaboration of student and academic affairs; however, it is the duty of Higher Education professionals to understand that value and work more collaboratively to ensure that students are served holistically

A Dangerous Servant and a Fearful Master: Why Florida’s Prescribed Fire Statute Should be Amended

Fire will not be denied its opportunity to burn through Florida’s forests. The citizens of Florida, however, can accept the responsibility of deciding how the forest will burn. Fire can be purposefully ignited under exact weather conditions, acting as a controlled but dangerous servant with a slim chance of escape or harm. Or, if Floridians refuse to accept any responsibility in proactively managing forest fire, nature will determine when the forest will burn. The fire will be a fearful master, raging through the forest with the potential to cause great harm to people, property, and the environment. In recognition of the important role that the intentional use of fire has in reducing wildfire hazard, not to mention its important ecological and economic functions, the Florida legislature enacted laws protecting fire practitioners from liability. These laws protect practitioners from liability as long as they are not grossly negligent in conducting the fire and meet certain requirements. Although this law is extremely important to fire practitioners, it can be interpreted as providing no protection if a legally set fire unexpectedly escapes and causes harm. This has the effect of discouraging landowners from conducting fire operations. This Note argues that, in order to encourage the men and women who are willing to accept the challenge of using intentional fire to reduce wildfire risk, the prescribed fire statute should be amended