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  • 11
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    Effect of moisture and temperature on the phosphorus content of crude soybean oil extracted from fine flour (1991)
    Wiley
    Details
    Publication Date: 1991-11-01
    Print ISSN: 0003-021X
    Electronic ISSN: 1558-9331
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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    PAPER CURRENT
  • 12
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    Thermoelastic vibration test techniques (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The structural integrity of proposed high speed aircraft can be seriously affected by the extremely high surface temperatures and large temperature gradients throughout the vehicle's structure. Variations in the structure's elastic characteristics as a result of thermal effects can be observed by changes in vibration frequency, damping, and mode shape. Analysis codes that predict these changes must be correlated and verified with experimental data. The experimental modal test techniques and procedures used to conduct uniform, nonuniform, and transient thermoelastic vibration tests are presented. Experimental setup and elevated temperature instrumentation considerations are also discussed. Modal data for a 12 by 50 inch aluminum plate heated to a temperature of 475 F are presented. These data show the effect of heat on the plate's modal characteristics. The results indicated that frequency decreased, damping increased, and mode shape remained unchanged as the temperature of the plate was increased.
    Keywords: STRUCTURAL MECHANICS
    Type: In: International Modal Analysis Conference (IMAC), 9th, Florence, Italy, Apr. 15-18, 1991, Proceedings. Vol. 2 (A93-29227 10-39); p. 1473-1484.
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Determination of the effects of heating on modal characteristics of an aluminum plate with application to hypersonic vehicles (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The structural integrity of proposed high speed aircraft can be seriously affected by the extremely high surface temperatures and large temperature gradients throughout the vehicle's structure. Variations in the structure's elastic characteristics as a result of thermal effects can be seen by changes in vibration characteristics. Analysis codes that predict these changes must be correlated and verified with experimental data. Analytical and experimental modal test results are given from uniform, nonuniform, and transient thermoelastic vibration tests of a 12 x 50 x 0.19 aluminum plate. The data show the effect of heat on the modal characteristics of the plate. The results showed that frequencies decreased, damping increased, and mode shapes remained unchanged as the temperature of the plate increased. Analytical predictions provided good correlation with experimental results.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-4274 , H-1688 , NAS 1.15:4274
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    Monte Carlo Shower Counter Studies (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Activities and accomplishments related to the Monte Carlo shower counter studies are summarized. A tape of the VMS version of the GEANT software was obtained and installed on the central computer at Gallaudet University. Due to difficulties encountered in updating this VMS version, a decision was made to switch to the UNIX version of the package. This version was installed and used to generate the set of data files currently accessed by various analysis programs. The GEANT software was used to write files of data for positron and proton showers. Showers were simulated for a detector consisting of 50 alternating layers of lead and scintillator. Each file consisted of 1000 events at each of the following energies: 0.1, 0.5, 2.0, 10, 44, and 200 GeV. Data analysis activities related to clustering, chi square, and likelihood analyses are summarized. Source code for the GEANT user subprograms and data analysis programs are provided along with example data plots.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-191364 , NAS 1.26:191364
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    Flow of superfluid helium in tubes with heated walls (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The equations for superfluid helium flowing through a straight tube with heated walls are integrated. The model equations are based on those of Landau as modified for superfluid turbulence by Gorter and Mellink (1949). The model is implemented by the program SUPERFLOW which runs on a personal computer. The effect of the heating level on the mass flux, the energy flux, and the pressure and temperature profiles is investigated. The four types of profiles which occur without sidewall heating are also found with heated walls. The progression through these four types is shown to depend primarily on the dimensionless parameter, defined previously to characterize the unheated profiles, and a dimensionless ratio of heat fluxes. The pressure and temperature maxima which rise well above the boundary values increase significantly with sidewall heating. Approximate design equations for estimating the mass flux and the profiles are presented. The physical basis of the results is discussed. These results are useful in the design of optimal cooling loops and other superfluid flow systems.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: In: Advances in cryogenic engineering. Vol. 37A - Proceedings of the 1991 Cryogenic Engineering Conference, Univ. of Alabama, Huntsville, June 11-14, 1991 (A93-48578 20-37); p. 81-88.
    Format: text
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    NASA TECHNICAL REPORTS
  • 16
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    High temperature ground vibration test techniques (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the experimental modal test techniques and procedures used to conduct uniform, nonuniform, and transient thermoelastic vibration tests. Experimental setup and elevated temperature instrumentation considerations are also discussed. Modal data for a 30.48- by 127-cm aluminum plate heated to a temperature of 371.1 C are presented. These data show the effect of heat on the plate's modal characteristics.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: Structural Testing Technology at High Temperature; Nov 04, 1991 - Nov 06, 1991; Dayton, OH; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Co-operative oscillations of bubbles (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A closed cryogenic storage tank in space may contain several bubbles. It is shown that these bubbles can oscillate in volume with n-1 resonant frequencies for n bubbles. The resonances can be excited by a sudden change in pressure, such as withdrawing fluid or venting, or by motion of the vehicle. In situations in which the ac accelerations dominate, such as in large space structures, the potential for harmful coupling of these oscillations to the spacecraft structure must be examined. Experimental data are presented which support the theoretical predictions.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenics (ISSN 0011-2275); 30; 187-192
    Format: text
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    NASA TECHNICAL REPORTS
  • 18
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    Thermoelastic vibration test techniques (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The structural integrity of proposed high speed aircraft can be seriously affected by the extremely high surface temperatures and large temperature gradients throughout the vehicle's structure. Variations in the structure's elastic characteristics as a result of thermal effects can be observed by changes in vibration frequency, damping, and mode shape. Analysis codes that predict these changes must be correlated and verified with experimental data. The experimental modal test techniques and procedures used to conduct uniform, nonuniform, and transient thermoelastic vibration tests are presented. Experimental setup and elevated temperature instrumentation considerations are also discussed. Modal data for a 12 by 50 inch aluminum plate heated to a temperature of 475 F are presented. These data show the effect of heat on the plate's modal characteristics. The results indicated that frequency decreased, damping increased, and mode shape remained unchanged as the temperature of the plate was increased.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-101742 , H-1707 , NAS 1.15:101742 , International Modal Analysis Conference; Apr 14, 1991 - Apr 18, 1991; Florence; Italy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 19
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    Self-driven cooling loop for a large superconducting magnet in space (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Pressurized cooling loops in which superfluid helium circulation is driven by the heat being removed have been previously demonstrated in laboratory tests. A simpler and lighter version which eliminates a heat exchanger by mixing the returning fluid directly with the superfluid helium bath was analyzed. A carefully designed flow restriction must be used to prevent boiling in this low-pressure system. A candidate design for Astromag is shown that can keep the magnet below 2.0 K during magnet charging. This gives a greater margin against accidental quench than approaches that allow the coolant to warm above the lambda point. A detailed analysis of one candidate design is presented.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenics (ISSN 0011-2275); 32; 2 19; 205-211
    Format: text
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    NASA TECHNICAL REPORTS
  • 20
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    End-to-end modelling of He II flow systems (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A practical computer code has been developed which uses the accepted two-fluid model to simulate He II flow in complicated systems. The full set of equations are used, retaining the coupling between the pressure, temperature and velocity fields. This permits modeling He II flow over the full range of conditions, from strongly or weakly driven flow through large pipes, narrow channels and porous media. The system may include most of the components used in modern superfluid flow systems: non-ideal thermomechanical pumps, tapered sections, constrictions, lines with heated side walls and heat exchangers. The model is validated by comparison with published experimental data. It is applied to a complex system to show some of the non-intuitive feedback effects that can occur. This code is ready to be used as a design tool for practical applications of He II. It can also be used for the design of He II experiments and as a tool for comparison of experimental data with the standard two-fluid model.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenics (ISSN 0011-2275); 32; 3 19; 291-299
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    NASA TECHNICAL REPORTS
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