Energy absorbing device Patent
Nonreuseable energy absorbing device comprising ring member with plurality of recesses, cutting members, and guide member mounted in each recess
Vontiesenhausen, G. F.↗
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Results for “absorber”
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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Dynamic vibration absorber Patent
Tuned damped vibration absorber for mass vibrating in more than one degree of freedom for use with wind tunnel models
Igoe, W. B.↗
Thermal radiation heat transfer. Volume 3 - Radiation transfer with absorbing, emitting, and scattering media
Thermal radiative heat transfer in absorbing, emitting, and scattering media
Howell, J. R.↗
Evaluation of an energy absorbing crew seat integrated with a rocket extraction system
Design, fabrication, and tests of energy absorbing seat integrated with extraction tractor rocket for space shuttle
Carpenter, R.↗
The absorbed dose and dose equivalent from neutrons in the energy range 60 to 3000 MeV and protons in the energy range 400 to 3000 MeV
Absorbed dose equivalent from high energy neutrons and protons incident on tissue, using nucleon- meson cascade calculations
Alsmiller, R. G., Jr.↗
Radiant heat transfer to absorbing fluid media
Radiant heat transfer from heated cylindrical enclosure with black/gray walls to absorbing gas or gas having black particles, calculating absorption coefficients
Keng, E. Y. H.↗
An exact solution of linearized flow of an emitting, absorbing and scattering grey gas
Emitting, absorbing and scattering gray gas flow through plane stationary normal shock wave, presenting governing equations linearized analysis
Cheng, P.↗
Ground and flight test results for a decelerator towline energy absorber
Parachute decelerator towline energy absorber shock attenuation characteristics, discussing drop test results
Councill, E. L., Jr.↗
Energy absorber uses expanded coiled tube
Mechanical shock mitigating device, based on working material to its failure point, absorbs mechanical energy by bending or twisting tubing. It functions under axial or tangential loading, has no rebound, is area independent, and is easy and inexpensive to build.
Johnson, E. F.↗
Nuclear electromagnetic cascades from alpha particles incident on an iron absorber
Mean values and fluctuations of the nuclear-electromagnetic cascade development resulting from alpha particles incident on an iron absorber was determined for the primary energy range 10 to 300 GeV/nucleon. This has been accomplished by using a three-dimensional Monte Carlo simulation of the cascade process. The model used was first adjusted until it gave predictions for a small ionization spectrometer which agreed with measurements obtained by exposing the same spectrometer to 10, 20.5, and 28 GeV/c protons at an accelerator. The calcuations were then modified to apply to high energy alpha particles. The results show that measurements of the energies of alpha particles incident on an iron spectrometer with six interaction lengths total depth can be made with accuracies ranging from approximately 5% at 300 GeV/nucleon to approximately 16% at 10 GeV/nucleon.
Jones, W. V.↗
A portable absorbed dose measuring instrument with gamma discrimination
The characteristics of an electronic instrument for measuring the radiation dose absorbed by tissues are presented. The detector is a sphere of tissue-equivalent plastic with a single wire located on a diameter of the sphere. The electronic circuits and method of operation of the detector are described. Advantages are the small size and easy portability plus ability to selectively measure neutron and gamma plus neutron events.
Quam, W. M.↗
Radiative transfer effects on reflected shock waves. II - Absorbing gas.
Radiative cooling effects behind a reflected shock wave are calculated for an absorbing-emitting gas by means of an expansion procedure in the small density ratio across the shock front. For a gray gas shock layer with an optical thickness of order unity or less the absorption integral is simplified by use of the local temperature approximation, whereas for larger optical thicknesses a Rosseland diffusion type of solution is matched with the local temperature approximation solution. The calculations show that the shock wave will attenuate at first and then accelerate to a constant velocity. Under appropriate conditions the gas enthalpy near the wall may increase at intermediate times before ultimately decreasing to zero. A two-band absorption model yields end-wall radiant-heat fluxes which agree well with available shock-tube measurements.
Su, F. Y.↗
Absorbing-sphere model for calculating ion-ion recombination total cross sections.
An 'absorbing-sphere' model based on the Landau-Zener method is set up for calculating the upper limit thermal energy (300 K) reaction rate and the energy dependence of the total cross sections. The crucial parameter needed for the calculation is the electron detachment energy for the outer electron on the anion. It is found that the cross sections increase with decreasing electron detachment energy.
Olson, R. E.↗
Interior radiances in optically deep absorbing media. 1: Exact solutions for one-dimensional model
The exact solutions are obtained for a one dimensional model of a scattering and absorbing medium. The results are given for both the reflected and transmitted radiance for any arbitrary surface albedo as well as for the interior radiance. These same quantities are calculated by the matrix operator method. The relative error of the solutions is obtained by comparison with the exact solutions as well as by an error analysis of the equations. The importance of an accurate starting value for the reflection and transmission operators is shown. A fourth order Runge-Kutta method can be used to solve the differential equations satisfied by these operators in order to obtain such accurate starting values.
Kattawar, G. W.↗
Apollo couch energy absorbers
Load attenuators for the Apollo spacecraft crew couch and its potential applications are described. Energy absorption is achieved through friction and cyclic deformation of material. In one concept, energy absorption is accomplished by rolling a compressed ring of metal between two surfaces. In another concept, energy is absorbed by forcing a plastically deformed washer along a rod. Among the design problems that had to be solved were material selection, fatigue life, ring slippage, lubrication, and friction loading.
Wesselski, C. J.↗
Ply-tear webbing energy absorber
Ply-tear webbing is essentially two plain webbings that are bound together by a portion of the warps and that can be torn apart and do work by breaking the binders. Nylon webbing were woven to range in tear force from 1 to 10 kilonewtons. This force is substantially independent of speed, which was as high as 100 m/sec in some cases. A specific energy absorption of 90 J/g was achieved in the dry state. However, lower rated webbings that absorb approximately 40 J/g are recommended for use in practice where it is acceptable.
Stevens, G. W. H.↗
A model for the pressure excitation spectrum and acoustic impedance of sound absorbers in the presence of grazing flow
The acoustic impedance of sound absorbers in the presence of grazing flow is essential information when analyzing sound propagation within ducts. A unification of the theory of the nonlinear acoustic resistance of Helmholtz resonators including grazing flow is presented. The nonlinear resistance due to grazing flow is considered to be caused by an exciting pressure spectrum produced by the interaction of the grazing flow and the jets flowing from the resonator orifices. With this exciting pressure spectrum the resonator can be treated in the same manner as a resonator without grazing flow but with an exciting acoustic spectrum.
Rice, E. J.↗