12,335 research outputs found
Community reactions to aircraft noise - Noise measurements
Acoustical and social data on community reactions to aircraft nois
Comparative evaluation of twenty pilot workload assessment measure using a psychomotor task in a moving base aircraft simulator
A comparison of the sensitivity and intrusion of twenty pilot workload assessment techniques was conducted using a psychomotor loading task in a three degree of freedom moving base aircraft simulator. The twenty techniques included opinion measures, spare mental capacity measures, physiological measures, eye behavior measures, and primary task performance measures. The primary task was an instrument landing system (ILS) approach and landing. All measures were recorded between the outer marker and the middle marker on the approach. Three levels (low, medium, and high) of psychomotor load were obtained by the combined manipulation of windgust disturbance level and simulated aircraft pitch stability. Six instrument rated pilots participated in four seasons lasting approximately three hours each
Control System Optimization for Saturn 5 Launch Vehicles Using Gradient Techniques Final Report
Control system optimization for Saturn 5 launch vehicles using gradient technique
Magnetic compressibility and ion-temperature-gradient-driven microinstabilities in magnetically confined plasmas
The electromagnetic theory of the strongly driven ion-temperature-gradient
(ITG) instability in magnetically confined toroidal plasmas is developed.
Stabilizing and destabilizing effects are identified, and a critical
(the ratio of the electron to magnetic pressure) for stabilization
of the toroidal branch of the mode is calculated for magnetic equilibria
independent of the coordinate along the magnetic field. Its scaling is
where is the characteristic electron
temperature gradient length, and the major radius of the torus. We
conjecture that a fast particle population can cause a similar stabilization
due to its contribution to the equilibrium pressure gradient. For sheared
equilibria, the boundary of marginal stability of the electromagnetic
correction to the electrostatic mode is also given. For a general magnetic
equilibrium, we find a critical length (for electromagnetic stabilization) of
the extent of the unfavourable curvature along the magnetic field. This is a
decreasing function of the local magnetic shear
The application of optimal control technqiues to advanced manned missions, volume 1
Two problems are presented in the area of optimal control and its application to the design of attitude control systems for advanced complex aerospace vehicles. The problems discussed are specification of performance criteria in terms of structural load minimization and/or maximum orbital payload injection requirements of the controlled vehicle; and formulation and solution of the optimization problem such that practical control systems are obtained
A study for development of aerothermodynamic test model materials and fabrication technique
A literature survey, materials reformulation and tailoring, fabrication problems, and materials selection and evaluation for fabricating models to be used with the phase-change technique for obtaining quantitative aerodynamic heat transfer data are presented. The study resulted in the selection of two best materials, stycast 2762 FT, and an alumina ceramic. Characteristics of these materials and detailed fabrication methods are presented
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