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Aug 22, 2016
08/16
Aug 22, 2016
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NASA Technical Reports Server (NTRS)
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A hand held hydraulic cutting tool was developed which is particularly useful in deactivating ejection seats in military aircraft rescue operations. The tool consists primarily of a hydraulic system composed of a fluid reservoir, a pumping piston, and an actuator piston. Mechanical cutting jaws are attached to the actuator piston rod. The hydraulic system is controlled by a pump handle. As the pump handle is operated the actuator piston rod is forced outward and thus the cutting jaws are forced...
Topics: NASA Technical Reports Server (NTRS), ACTUATORS, CUTTERS, CUTTING, HYDRAULIC EQUIPMENT, PIPES...
The approach used to assess shadowing reductions on the heating of orbiting trusses involves determining the heating rates with slender member shadowing effects included and then obtaining the thermal response of the shadowed member. Steps taken to identify shadowers, find locations where shadowing occurs and calculate shadow intensity are listed. The finite element thermal structural analysis of cable stiffened space structure is delineated and the exact solution of the caternary problem is...
Topics: NASA Technical Reports Server (NTRS), DYNAMIC RESPONSE, LARGE SPACE STRUCTURES, SHADOWS, STRUCTURAL...
Investigation of the basic requirements for modeling slender member shadowing effects on thermally induced deformation continues. The theoretical formulation is complete and computer programming is underway. The basic requirements for thermal finite elements to model heat transfer in orbiting structures were also studied. The need for planar isothermal elements to model large space structures' antenna meshes was established. Finite Element approaches for modeling space structure cable and...
Topics: NASA Technical Reports Server (NTRS), DYNAMIC RESPONSE, HEAT TRANSFER, LARGE SPACE STRUCTURES,...
Tests were conducted with a van mounted experimental magnetic leader cable sensor to evaluate its potential for measuring aircraft displacement and heading with respect to the leader cable during roll out and turnoff. Test results show that the system may be usable in measuring displacement but the heading measurement contains errors introduced by distortion of the magnetic field by the metal van or aircraft.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT GUIDANCE, CABLES (ROPES), TOWING, ERROR ANALYSIS,...
Some seven different configurations of the NSI and other cables were tested in the NASA-MSFC Hot Gas Facility (HGF). The tests were conducted to study what happens to the cables when they are exposed to hot flow as was the case in the first two Shuttle flights, the STS-1 and STS-2. Protection of these components is vital for various functions especially to attain proper nozzle separation. The tests in the HGF demonstrated the severity of the aerodynamic forces combined with aero heating...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC HEATING, AFTERBODIES, CABLES (ROPES), HIGH...
Cable technology is discussed. Manufacturing flow and philosophy are considered. Acceptance, gratification and flight tests are discussed. Fifteen-meter and fifty-meter models are considered. An economic assessment is included.
Topics: NASA Technical Reports Server (NTRS), ANTENNA COMPONENTS, ANTENNA DESIGN, REFLECTORS, CABLES...
The first of a two-phase program was performed to develop the technology necessary to evaluate, design, manufacture, package, transport and deploy the hoop/column deployable antenna reflector by means of a ground based program. The hoop/column concept consists of a cable stiffened large diameter hoop and central column structure that supports and contours a radio frequency reflective mesh surface. Mission scenarios for communications, radiometer and radio astronomy, were studied. The data to...
Topics: NASA Technical Reports Server (NTRS), ANTENNA COMPONENTS, ANTENNA DESIGN, REFLECTORS, CABLES...
The User's Manual provides the basic information necessary to run the programs. This includes descriptions of the various data files necessary for the program, the various outputs from the program and the options available to the user when executing the program. Additional data file information is contained in the three appendices to the manual. These appendices list all input variables and their permissible values, an example listing of these variables, and all output variables available to...
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), DYNAMIC CHARACTERISTICS, HEAVY LIFT AIRSHIPS,...
A finite element space structures research focused on the interdisciplinary problems of heating, thermal, and structural analysis is discussed. Slender member shadowing effects, and cable stiffened structures are described.
Topics: NASA Technical Reports Server (NTRS), LARGE SPACE STRUCTURES, RIGID STRUCTURES, SHADOWS, SLENDER...
The arresting of a moving body is improved through the use of steel cables that elongate to absorb the kinetic energy of the body. A sleeve surrounds the cables, protecting them from chafing and providing a failsafe energy absorbing system should the cables fail.
Topics: NASA Technical Reports Server (NTRS), BRAKES (FOR ARRESTING MOTION), CABLES (ROPES), STAINLESS...
Analytical studies of mast-cable-hoop-membrane type antennas were conducted using a transfer matrix numerical analysis approach. This method, by virtue of its specialization and the inherently easy compartmentalization of the formulation and numerical procedures, can be significantly more efficient in computer time required and in the time needed to review and interpret the results.
Topics: NASA Technical Reports Server (NTRS), ANTENNA COMPONENTS, DYNAMIC STRUCTURAL ANALYSIS, LOOP...
A foldable beam possessing superior qualities of light weight, compactness for transportation, quick deployment with minimum use of force, and high strength is described. These qualities are achieved through the use of a series of longitudinally rigid segments, hinged along one side and threaded by one or two cables along the opposite side. Tightening the cables holds the beam extended. Loosening the cables permits the segments to fold away from the threaded side. In one embodiment the segments...
Topics: NASA Technical Reports Server (NTRS), ASSEMBLIES, BEAMS (SUPPORTS), FOLDING STRUCTURES, HINGES,...
A continuously variable transmission (CVT) design layout was completed. The intended application was for coupling the flywheel to the driveline of a flywheel battery hybrid electric vehicle. The requirements were that the CVT accommodate flywheel speeds from 14,000 to 28,000 rpm and driveline speeds of 850 to 5000 rpm without slipping. Below 850 rpm a slipping clutch was used between the CVT and the driveline. The CVT was required to accommodate 330 ft-lb maximum torque and 100 hp maximum...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC HYBRID VEHICLES, FLYWHEELS, MECHANICAL DRIVES,...
A belt for transmitting power from a cogged driving member to a cogged driven member such as a pair of wheel sprockets is described. The belt has inflexible teeth spaced along the direction of its travel. Each of the teeth has a longitudinal axis transverse to the direction of belt travel. The belt also includes substantially inextensible fasts spaced transversely to the direction of belt travel. The fasts extend in the direction of belt travel adjacent to the teeth and are looped around...
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), DURABILITY, GEAR TEETH, MECHANICAL DRIVES,...
An application of the membrane element to the problem of the tensioning of a conveyer belt which wraps around a drum is presented. Two cases were investigated: (1) belt tension increase due to drum edge wear; and (2) material trapped between the drum and the belt. In both cases it was found that the increase in belt tension was due to the additional stretching of the belt resulting from the drum radius change rather than from the transverse deflection of the belt.
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), FINITE ELEMENT METHOD, STRESS ANALYSIS,...
The requirements, design, and performance of a centrifugal regulator aimed at limiting deployment rates of deployable elements are discussed. The overall mechanism is comprised of four distinct functional parts in a machined housing: (1) the centrifugal brake device, which checks the payout of a deployment cable; (2) the reducing gear, which produces the spin rate necesary for the braking device; (3) the payout device, which allows the unwinding of the cable; and (4) the locking device, which...
Topics: NASA Technical Reports Server (NTRS), BRAKES (FOR ARRESTING MOTION), CENTRIFUGAL FORCE, DEPLOYMENT,...
A mechanical system is disclosed to deploy an antenna on a support which may, for example, be a spacecraft. A series of telescoping tubes are nested one within the other when the antenna is in a retracted stowed position. The outermost tube is rigidly attached to the support and the inner tubes are latched in the stowed position by a caging mechanism. The antenna is driven toward a deployed position by a dual motor driven cable which is terminated in a driving tube at the lower end of the...
Topics: NASA Technical Reports Server (NTRS), DEPLOYMENT, EXPANDABLE STRUCTURES, MECHANICAL DRIVES,...
A helical cable car grip to minimize high maintenance costs of San Francisco's cable car operation is presented. The grip establishes a rolling contact between the cable and grip to reduce sliding friction and associated cable wear. The design, development, and testing of the helical cable car grip are described.
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), SAN FRANCISCO (CA), SURFACE VEHICLES,...
The device proposed to gather subsurface data on the planet Mars is a ballistic probe which penetrates the soil after a free fall through the Martian atmosphere. Highlights of the design, development, and testing of several features of the Mars Surface Penetration Probe are outlined.
Topics: NASA Technical Reports Server (NTRS), GEOPHYSICS, MARS PROBES, MARS SURFACE, MECHANICAL DEVICES,...
An inertial energy storage device is disclosed which uses flywheel made of flexible material such as a twisted rope ring. A small number of the strands of the rope ring have a tensile strength that is lower than that of most of the other strands so that should any of these strands fail, they will begin to whiplash allowing such a failure to be detected and braked before a castastrophic failure occurs. This accomplished by the inclusion of glass tubes located around the periphery of the...
Topics: NASA Technical Reports Server (NTRS), FAIL-SAFE SYSTEMS, FLEXIBILITY, FLYWHEELS, SAFETY FACTORS,...
A space elevator is forecasted for the first quarter of the 21st century, that will consist of a cable attached at the earth's equator, suspended in space by an artificial satellite in geosynchronous orbit. It is stated that such a transport system will supplement rockets as the railway supplements aircraft. Specific aspects of the system are examined, including provisions for artificial gravity, the development special composite construction materials exhibiting high strength and low mass, and...
Topics: NASA Technical Reports Server (NTRS), ELEVATORS (LIFTS), SPACE STATIONS, SPACE TRANSPORTATION,...
The GEOS cable boom mechanism allows the controlled deployment of a 20 m long cable in a centrifugal force field. In launch configuration the flat cable is reeled on a 240 mm diameter drum. The electrical connection between the rotating drum and the stationary housing is accomplished via a flexlead positioned inside the drum. Active motion control of this drum is achieved by a self locking worm gear, driven by a stepper motor. The deployment length of the cable is monitored by an optical length...
Topics: NASA Technical Reports Server (NTRS), BOOMS (EQUIPMENT), CABLES (ROPES), GEOS SATELLITES (ESA),...
The GEOS Cable Boom Mechanism which allows the controlled deployment of a 20 m long cable in a centrifugal force field is described. In launch configuration the flat cable is reeled on a 240 mm diameter drum. The electrical connection between the rotating drum and the stationary housing is accomplished via a flexlead positioned inside the drum. Active motion control of this drum is achieved by a self locking worm gear, driven by a stepper motor. The deployment length of the cable is monitored...
Topics: NASA Technical Reports Server (NTRS), BOOMS (EQUIPMENT), GEOS SATELLITES (ESA), MECHANICAL DEVICES,...
A descent device is provided for emergency descent from tall structures and for lowering objects from high elevations, such as a hovering helicopter. The device includes a rotating spool having a cable wound thereon for descent and a rotation-retarding vane member which rotates in a fluid cylinder. An adjustable bypass is provided for the fluid as the vane member rotates therein so that the speed of descent can be adjustably controlled.
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), DESCENT, EMERGENCY LIFE SUSTAINING SYSTEMS,...
The revision of an existing digital program to analyze the stability of models mounted on a two-cable mount system used in a transonic dynamics wind tunnel is presented. The program revisions and analysis of an active feedback control system to be used for controlling the free-flying models are treated.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT MODELS, CABLES (ROPES), COMPUTER TECHNIQUES,...
The effects of several cable suspension configurations on the first free-free flexural frequency of uniform beams have been determined by experiment and analysis. The results of this study confirm that in general the larger the test vehicle the larger is the flexural frequency measurement error attributable to a given cable suspension configuration. For horizontally oriented beams representing modern aerospace vehicles of average size and flexibility, the restraining effects of all but the...
Topics: NASA Technical Reports Server (NTRS), BEAMS (SUPPORTS), CABLES (ROPES), MECHANICAL PROPERTIES,...
A compilation is presented that reflects the uses, adaptation, and maintenance plus service, that are innovations derived from problem solutions in the space R and D programs, both in house and by NASA and AEC contractors. Data cover: (1) technology revelant to the employment of flat conductor cables and their adaptation to and within conventional systems, (2) connectors and various adaptations, and (3) maintenance and service technology, and shop hints useful in the installation and care of...
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), CONNECTORS, NASA PROGRAMS, TECHNOLOGY...
The three dimensional equations of motion for a cable connected space station--counterweight system are developed using a Lagrangian formulation. The system model employed allows for cable and end body damping and restoring effects. The equations are then linearized about the equilibrium motion and nondimensionalized. To first degree, the out-of-plane equations uncouple from the inplane equations. Therefore, the characteristic polynomials for the in-plane and out-of-plane equations are...
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), SPACE STATIONS, SPACECRAFT CONFIGURATIONS,...
A mechanical device for receiving a cable and controlling the motion of the cable is described. The cable moves freely in one direction and movement is resisted in the opposite direction until the forces exerted on the cable exceed a predetermined amount. Exceeding the minimum amount of force permits the cable to move in the opposite direction. Diagrams of the device are included.
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), CONSTRAINTS, MECHANICAL DEVICES, EQUIPMENT...
The three dimensional equations of motion for a cable connected space station - counterweight system are developed using a Lagrangian formulation. The system model employed allows for cable and end body damping and restoring effects. The equations are then linearized about the equilibrium motion and nondimensionalized. To first degree, the out-of-plane equations uncouple from the in-plane equations. Therefore, the characteristic polynomials for the in-plane and out-of-plane equations are...
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), COUNTERBALANCES, SPACE STATIONS, THREE...
The dynamic analysis for earthquake- and wind-induced response of a long span, cable-stayed freeway bridge by NASTRAN in conjunction with post-processors is described. Details of the structural modeling, the input data generation, and numerical results are given. The influence of the dynamic analysis on the bridge design is traced from the project initiation to the development of a successful earthquake and wind resistant configuration.
Topics: NASA Technical Reports Server (NTRS), BRIDGES (STRUCTURES), COMPUTER PROGRAMS, STRUCTURAL ANALYSIS,...
The conception of a cable boom system for a scientific spin stabilized satellite led to a flat cable stowed on a drum with a flexlead without conversion to avoid slip rings and to facilitate automatic restowage from any state of deployment. Some dynamic features of the extended cable boom and especially the comparison between round and flat cables were investigated in a phenomenological study using a test rig capable of inducing lateral, torsional and thermal cycling disturbances separately or...
Topics: NASA Technical Reports Server (NTRS), BOOMS (EQUIPMENT), CABLES (ROPES), MECHANICAL DRIVES,...
Sampling procedures and techniques described resulted from various flight project microbiological monitoring programs of unmanned planetary spacecraft. Concurrent with development of these procedures, compatibility evaluations were effected with the cognizant spacecraft subsystem engineers to assure that degradation factors would not be induced during the monitoring program. Of significance were those areas of the spacecraft configuration for which special handling precautions and/or...
Topics: NASA Technical Reports Server (NTRS), BIOASSAY, MICROBIOLOGY, PARTICULATE SAMPLING, SPACECRAFT...
Relatively simple inexpensive device uses reeled steel cable, is controlled by automotive-type shock absorber, and allows safe descent from burning building. Device is cheap to manufacture and assemble and requires neither skill, special knowledge, or athletic ability to operate. It is reliable and fireproof and can be deployed instantly.
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), ESCAPE SYSTEMS, FIRES, SHOCK ABSORBERS,...
A general stability analysis of a cable-body system immersed in a fluid stream is presented. The analytical portion of this analysis treats the system as being essentially a cable problem, with the body dynamics giving the end conditions. The mathematical form of the analysis consists of partial differential wave equations, with the end and auxiliary conditions being determined from the body equations of motion. The equations uncouple to give a lateral problem and a longitudinal problem as in...
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), FLOW EQUATIONS, FLUID DYNAMICS, TETHERLINES,...
A general theory on mathematical modeling of elastic parachute suspension lines during the unfurling process was developed. Massless-spring modeling of suspension-line elasticity was evaluated in detail. For this simple model, equations which govern the motion were developed and numerically integrated. The results were compared with flight test data. In most regions, agreement was satisfactory. However, poor agreement was obtained during periods of rapid fluctuations in line tension.
Topics: NASA Technical Reports Server (NTRS), ELASTIC PROPERTIES, MATHEMATICAL MODELS, PARACHUTES, CABLES...
Simple tool for measuring relative cable tension is described, which weighs approximately two pounds, and can be produced at one-tenth cost of present tools.
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), COSTS, ELEVATORS (LIFTS), MEASURING...
Stabilizer, developed for outdoor elevators, prevents cables from swaying in the wind.
Topics: NASA Technical Reports Server (NTRS), CABLES (ROPES), CONTROL STABILITY, ELEVATORS (LIFTS),...
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Jun 15, 2011
06/11
Jun 15, 2011
by
Pride, J. D
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The applications of various separation mechanisms to meet flight mission goals within the physical and environmental constraints of a single stage rocket test vehicle are considered. Each separation concept was selected from the numerous choices available on the basis of its unique requirement and the flight test vehicle incorporated several different concepts. Attention to specific requirements and thoroughness in design and testing were essential to success since there is no specific single...
Topics: BOOMS (EQUIPMENT), CABLES (ROPES), MECHANICAL DRIVES, SATELLITE-BORNE INSTRUMENTS, AEROSPACE...
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120
May 31, 2011
05/11
May 31, 2011
by
Stadler, Stephen J.; Czajkowski, Kevin P.; Goward, Samuel N.; Xue, Yongkan
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The three main objectives of the overall project were: 1. Adaptation of environmental constraint methods to take advantage of EOS sensors, specifically, MODIS, ASTER, and Landsat-7, in addition to the PM AVHRR observations 2. Refinement of environmental constraint methods based on fundamental scientific knowledge. 3. Assessment of spatial scaling patterns in environmental constraint measurements to evaluate the potential biases and errors that occur when estimating regional and global-scale NPP...
Topics: CABLES (ROPES), SPACE TRANSPORTATION, ENERGY TRANSFER, ROTATION, KINETIC ENERGY, SPACECRAFT...
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144
May 31, 2011
05/11
May 31, 2011
by
Bar-Itzhack, Itzhack Y.; Harman, Richard R
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This work describes two algorithms for computing the angular rate and attitude in case of a gyro and a Star Tracker failure in the Microwave Anisotropy Probe (MAP) satellite, which was placed in the L2 parking point from where it collects data to determine the origin of the universe. The nature of the problem is described, two algorithms are suggested, an observability study is carried out and real MAP data are used to determine the merit of the algorithms. It is shown that one of the...
Topics: SPACE FLIGHT, CABLES (ROPES), ROTATION, CENTRIFUGAL FORCE, PAYLOADS, LAUNCHING, SPACE STATIONS,...
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May 31, 2011
05/11
May 31, 2011
by
Sellar, R. Glenn; Sohn, Yongho; Mathur, Varun; Reardon, Pete
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In Phase 1 of this project, a hierarchy of techniques for H2 and He leak location was developed. A total of twelve specific remote sensing techniques were evaluated; the results are summarized. A basic diffusion model was also developed to predict the concentration and distribution of H2 or He resulting from a leak. The objectives of Phase 2 of the project consisted of the following four tasks: Advance Rayleigh Doppler technique from TRL 1 to TRL 2; Plan to advance Rayleigh Doppler technique...
Topics: COUPLING, CONNECTORS, ROTATING BODIES, TELESCOPES, TANGLING, CABLES (ROPES)
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May 22, 2011
05/11
May 22, 2011
by
Carlson, John R.; Asbury, Scott C
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An experimental investigation was performed in the Langley 16-Foot Transonic tunnel to determine the effects of external and internal flap rippling on the aerodynamics of a nonaxisymmetric nozzle. Data were obtained at several Mach numbers from static conditions to 1.2 over a range of nozzle pressure ratios. Nozzles with chordal boattail angles of 10, 20, and 30 degrees, with and without surface rippling, were tested. No effect on discharge coefficient due to surface rippling was observed....
Topics: AIRCRAFT MODELS, COEFFICIENT OF FRICTION, DRAG, DYNAMIC PRESSURE, MACH NUMBER, POSITION (LOCATION),...
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Jul 12, 2010
07/10
Jul 12, 2010
by
Engle, J
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The thematic mapper primarily and its difference from MSS is reviewed. The TM has 30 meter resolution and the MSS has 80 meter resolution. This provides on agriculture an ability to accurately classify 10 acre fields with the TM versus 70 acre fields with the MSS data. There are six reflected light bands in the thematic mapper. Two bands are a new spectral region out in the IR, the shortwave IR region, as opposed to MSS's four reflected light bands. Four thematic mapper reflected light bands in...
Topics: ANTENNA COMPONENTS, ANTENNA DESIGN, REFLECTORS, CABLES (ROPES), DESIGN ANALYSIS, STRUCTURAL ANALYSIS
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Jul 6, 2010
07/10
Jul 6, 2010
by
BASHARINOV, A. E
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VARIOUS USES AND APPLICATIONS OF SPACEBORNE MICROWAVE MEASUREMENTS ARE GIVEN. SUCH MEASUREMENTS CAN BE USED TO DETECT FIRES, MEASURE SOIL MOISTURE AND TEMPERATURE, MEASURE SUB-ICE SOIL TEMPERATURES AND THE THICKNESS OF ICE COVER, AS WELL AS IN THE SEARCH FOR SUBSURFACE WATER.
Topics: MANIPULATORS, REMOTE CONTROL, SERVOMECHANISMS, AUTOMATIC CONTROL, CABLES (ROPES), UNDERWATER...
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Jun 26, 2010
06/10
Jun 26, 2010
by
NON
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Gamma ray producing decay modes of secondary particles produced in high energy cosmic ray interactions with interstellar and intergalactic gas
Topics: CABLE FORCE RECORDERS, MECHANICAL DEVICES, WINCHES, CABLES (ROPES), STRAIN GAGES, TENSIOMETERS
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Jun 21, 2010
06/10
Jun 21, 2010
by
Heer, E.; Lutes, L. D
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Receptance coupling of structural components near resonance frequency
Topics: COVERINGS, DIFFERENTIAL PRESSURE, EJECTION, INSTRUMENT PACKAGES, CABLES (ROPES), EJECTORS, LATCHES,...