Engineering topics
Publications and source records attributed to Johnson, R..
Soil features located with minimum time and labor. Ground-penetrating radar (GPR) system supplements manual and mechanical methods in performing subsurface soil survey. Mobile system obtains graphic profile of soil discontinuities and interfaces as function of depth. One or two test borings necessary to substantiate soil profile. GPR proves useful as reconnaissance tool.
This is the final report of technical work conducted during the fourth phase of a multiphase program having the objective of the design, development and flight evaluation of an advanced composite empennage component manufactured in a production environment at a cost competitive with those of its metal counterpart, and at a weight savings of at least 20 percent. The empennage component selected for this program is the vertical fin box of the L-1011 aircraft. The box structure extends from the fuselage production joint to the tip rib and includes front and rear spars. During Phase 4 of the program, production quality tooling was designed and manufactured to produce three sets of covers, ribs, spars, miscellaneous parts, and subassemblies to assemble three complete ACVF units. Recurring and nonrecurring cost data were compiled and documented in the updated producibility/design to cost plan. Nondestruct inspections, quality control tests, and quality acceptance tests were performed in accordance with the quality assurance plan and the structural integrity control plan. Records were maintained to provide traceability of material and parts throughout the manufacturing development phase. It was also determined that additional tooling would not be required to support the current and projected L-1011 production rate.
A procedure for fabricating graphite epoxy column elements used in the construction of large space platforms is described. Dry fiber is wound on a tapered aluminum mandrel in the LMSC vertical winding machine, and resin is injected between the mandrel and an outer sleeve. The winding and injection take place at elevated temperature to minimize the thermal expansion problems that arise in curing a tube on an aluminum mandrel when the end fittings are integrally wound.
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A theoretical model was developed to allow for the calculation of the synchrotron emission arising from high energy electrons trapped in the Van Allen belts of a planet with a dipole magnetic field. The model is general enough to allow for the calculation of the intensity of radiation received by an observer at any distance from and any latitude about the planet. The model is used to compute the emission from the earth's Van Allen belts that one should expect at various latitudes at a distance of 1.92 earth radii, the position of the Radio Astronomy Explorer satellite that was launched in 1968, for the frequencies 1.3 MHz and 2.2 MHz.
Biogeochemical analysis on lunar dust sample for organic compounds
Development and production of rectangular display panel connected to digital computer for two on state operation
System for optical acquisition and tracking, and laser beam deflector devices - electro-optical techniques for controlling direction of laser beam flow
Piezoelectrically powered laser beam waveguide for electro-optical acquisition and tracking
Operational systems engineering for orbiting satellite, emphasizing digital computer at command and telemetry data acquisition station