Effect of modifications of aerodynamic characteristics of a single-stage-to-orbit vehicle at Mach 5.9

Hypersonic stability, control, and performance characteristics were determined on a single-stage-to-orbit vehicle based on control-configured stability concepts. The configuration (0.006-scale model) had a large body with a small 50 deg swept wing. Two vertical-fin arrangements were investigated which consisted of a large center-line vertical tail and small wing-tip fins. The wing-tip fins had movable surfaces called controllers which could be deflected outward. Longitudinal and lateral directional characteristics were obtained over an angle-of-attack rage from 0 deg to 40 deg. The effects of tip-fin controller deflection on roll- and yaw-control characteristics at a sideslip angle of 0 deg were obtained. This investigation was conducted in the Langley 20 Inch Mach 6 Tunnel

Static stability characteristics of several raked-off circular and elliptical cones at mach 6.7

Static stability characteristics of circular and elliptical cones at hypersonic speed

Aerodynamic Characteristics at a Mach Number of 6.8 of Two Hypersonic Missile Configurations, One with Low-Aspect-Ratio Cruciform Fins and Trailing-Edge Flaps and One with a Flared Afterbody and All-Movable Controls

An investigation has been made to determine the aerodynamic characteristics in pitch at a Mach number of 6.8 of hypersonic missile configurations with cruciform trailing-edge flaps and with all-movable control surfaces. The flaps were tested on a configuration having low-aspect-ratio cruciform fins with an apex angle of 5 degrees; the all-movable controls were mounted at the 46.7-percent body station on a configuration having a 10 degrees flared afterbody. The tests were made through an angle-of-attack range of -2 degrees to 20 degrees at zero sideslip in the Langley 11-inch hypersonic tunnel. The results indicated that the all-movable controls on the flared-afterbody model should be capable of producing much larger values of trim lift and of normal acceleration than the trailing-edge-flap configuration. The flared-afterbody configuration had considerably higher drag than the cruciform-fin model but only slightly lower values of lift-drag ratio

A high reliability natural convection airliner actuator permanent magnet motor

This paper investigates the opportunity of making a natural convection permanent magnet motor for an airliner high lift actuator. The motor is designed to have a maximum lifespan and reliability: removing liquid or forced air cooling removes a fault source. A winding with fully segregated phases is chosen to minimize phase-to-phase winding faults due to partial discharges that may appear at low pressures (high altitudes). A thermal analysis of the power that can be dissipated by natural convection and radiation is conducted. A two-pole surface-mounted permanent magnet motor is finally designed and optimized with a finite elements method analysis, leading to a motor ten times longer than its forced air cooling counterpart

Research and Trends in Development

Keeping current with overall trends in development is important for the success of your library fundraising efforts. Research and Trends in Development will highlight performance metrics and indicators from a variety of sources as well as offer you news and updates in the field pertaining to fundraising in higher education. This session will provide you with fuel for innovation and the latest enhancements to best practices in annual, major, and planned giving strategies based upon current research and institutional examples

Transnational State-Corporate Symbiosis of Public Security: China’s Exports of Surveillance Technologies

Over the last two decades, the emerging Chinese Party-state has used commercial ties with North American and European providers of surveillance technologies to grow national prowess of public security, fostering a transnational state-corporate symbiosis. The exports of surveillance technologies from the Global North to China started in the late 1970s, and now Chinese technology companies are competing with and replacing those suppliers in the globalized neoliberal market. This research explores the two-way dynamic of China’s state and private surveillance capacity underscored by international companies’ profit-seeking behaviors and domestic technological and economic growth. Four case studies of companies from Canada, China, and the US are used to highlight the changing dynamics in the global circulation of surveillance technologies. Particular attention is paid to the cyclical nature of such technologies through which unresolved issues of global governance continue to emerge and, accordingly, support the growth of technology-powered authoritarianism worldwide

Modeling the rates of lead and strontium uptake by zeolitized tuff from Rainier Mesa, Nevada Test Site, Nevada

The fate and transport of contaminants released during nuclear testing at the NTS are partly controlled by interactions of their aqueous species with mineral surfaces. It has been shown that retardation of contaminants in the subsurface may be controlled by intraparticle mass transfer rather than equilibrium partitioning. For this reason, the rate of lead (Pb) and Strontium (Sr) uptake by zeolitized tuff from Rainier Mesa, NTS, was studied as a function of pH, ionic strength, and metal concentration; To test the hypothesis that sorption of Pb occurs through surface precipitation and Sr sorbs through diffusion, the data were modeled by a first order model and a diffusion model. The sorption of Pb(II), displaying rapid uptake by the zeolitized tuff, is described well by the first order model but the diffusion model cannot reproduce the fast initial uptake which is consistent with precipitation. Sorption of Sr(II) is consistent with diffusion and subsequent cation exchange

Optimisation and adaptation of an existing aeronautic motor to an HVDC network

This paper presents the evolution of an airliner fan BLDC motor to adapt it to an HVDC electrical network. The guiding principle of the design is to increase reliability. A non-overlapping teeth winding is introduced to separate the motor phases in order to limit winding failures and especially partial discharges. The machine is also optimised using spoke-type magnets flux concentration rotor, in order to reduce total mass. The new machine is compared to the existing one with a finite elements method analysis

Abort separation study of a shuttle orbiter and external tank at hypersonic speeds

The effects of several parameters on the relative motions of a space shuttle orbiter design and its external tank were determined during staging for the return-to-launch-site abort mode. The parameters included angle of attack, dynamic pressure, flight-path angle, pitch rate, elevon effectiveness and the use of thrust applied to the tank. The relative positions of each component were determined by a separation trajectory computer program which incorporated data obtained in wind-tunnel tests with the orbiter and tank in proximity. These tests were conducted at Mach 10.3 in a continuous-flow hypersonic tunnel. All separation cases were initiated at a constant Mach number of 10 with an assumed sideslip angle of 0 deg