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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Switching mechanism actuates an electrical circuit when a predetermined angular acceleration and displacement are reached. A rotor in the mechanism overcomes the restraint of a magnetic detent when the case in which the detent is mounted reaches the predetermined angular acceleration.
Body-fitted restraint harness enables workers to safely and conveniently handle critical components during their installation or removal. Since the harness supports the components, the worker is able to maneuver through restricted areas with his hands free. It is easily put on, adjusted, and removed, or comfortably worn without interfering with normal activities.
Bellows restraints, thrust-vector attitude-control gimbal devices, and tube clamp descriptions
This paper presents the initial results of a digital computer study of helicopter rotor-blade-motion stability for a broad range of forward speeds encompassing proposed conventional and compound helicopter designs. The analysis treats the general case of nonlinear, coupled flapping and lagging motions of hinged rigid blades. The results of the study to date indicate that blade-motion stability boundaries cannot be specified for a given blade design in terms of a fixed value of rotor tip-speed ratio. The stability boundaries can shift significantly within the desired operational speed range, with the stability limits depending upon the rotor loading, the magnitude of the disturbance encountered by the blade, and the blade position at the instant the external disturbance is encountered. The sample methods suggested for improving blade-motion stability include increasing the effective hinge spring restraint by incorporating pitch-flap coupling or by using hingeless or teetering rotor systems. Reducing rotor loading also has a beneficial effect on the blade-motion stability. The results indicate that methods used to deal with the blade-motion stability problem can be expected to diminish the overall vibration levels of the helicopter rotor system across the entire design speed range.
Supersonic flutter analysis for flat loaded orthotropic panels with edge restraint
Test device makes electrical connection to pins on unpotted electronic modules without introducing any displacing forces of the pins, thus preventing weld joint damage. The pins are spaced in a potting header, but are free to slide in and out except for restraint from welded wire joints.
Age forming of aluminum alloy using technique of restraint to shape skins
Frequency response, equation of motion, elastic restraint and structural flexibility of gyroscopic vibration absorber, noting antiresonant frequency functions
Double hook latch provides preloading and support capability up to 80,000 pounds and opens self-energizingly when restraint linkage is released. It incorporates a double hook latch held closed by a toggle linkage attached to a flexible cable rigged in tension.
Frequency response, equation of motion, elastic restraint and structural flexibility of gyroscopic vibration absorber, noting antiresonant frequency functions
Extravehicular activity of Gemini Program noting equipment retrieval, body restraints, tether dynamics, life support system and work loads assessment
Articulated rotor blade motion stability, numerically analyzing effect of initial disturbances on tip speed ratio for divergence and effects of restraints
Hot ductility tests, gas-tungsten-arc fillerless fusion tests, and circle patch-weld-restraint tests were conducted on Inconel 718 to better understand and correlate the weldability /resistance to hot cracking/ of the alloy. A correlation of the test results with composition, heat-treat condition, grain size, and microstructure was made.
Support techniques for restraint of slender bodies such as launch vehicles
Internal powers and effective temperatures of Jupiter and Saturn measured by aircraft mounted telescope, noting restraints on planetary structure and atmosphere models
Simulated zero gravity tests of force application by subjects in Apollo suits, varying worksite geometry, personnel restraints and force type and direction
Space environment husbandry, examining chickens stress response to restraint and parenteral hydration
System overcomes previous ergometer design and calibration problems including inaccurate measurements, large weight, size, and input power requirements, poor heat dissipation, high flammability, and inaccurate calibration. Device consists of lightweight, accurately controlled ergometer, restraint system, and calibration system.