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  • Books  (7)
  • Other Sources  (15)
  • 1
    Monograph available for loan
    Monograph available for loan
    Hochfrequenzfilter, Leitungen, Antennen; 1. (1995)
    Berlin [u.a.] : Springer
    Associated volumes
    Details Availability
    Call number: M 96.0351
    In: Hochfrequenztechnik
    Type of Medium: Monograph available for loan
    Pages: XVII, 492 S.
    Edition: 5., neubearb. Aufl
    ISBN: 3540580700
    Classification:
    C.5.1.
    Language: German
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Elektronik und Signalverarbeitung; 2. (1993)
    Berlin [u.a.] : Springer
    Associated volumes
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    Call number: M 96.0570
    In: Hochfrequenztechnik
    Type of Medium: Monograph available for loan
    Pages: 591 S.
    Edition: 4., neubearb. Aufl
    ISBN: 3540550844
    Classification:
    C.5.1.
    Language: German
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Elektronik und Signalverarbeitung; 2. Bd. (1974)
    Associated volumes
    Details Availability
    Call number: O 4787/2
    In: Lehrbuch der Hochfrequenztechnik
    Type of Medium: Monograph available for loan
    Pages: XII, 384 S. : Ill., graph. Darst.
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 4
    Monograph available for loan
    Monograph available for loan
    Koppelfilter, Leitungen, Antennen; 1. Bd. (1973)
    Berlin [u.a.] : Springer
    Associated volumes
    Details Availability
    Call number: O 4787/1
    In: Lehrbuch der Hochfrequenztechnik
    Type of Medium: Monograph available for loan
    Pages: 330 S. : graph. Darst.
    ISBN: 3540059741
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 5
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    Some adhesion/cohesion characteristics of plasma-sprayed ZrO2-Y2O3 under tensile loading (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A set of 12.7 mm diameter stainless steel tubes were coated with ceramic and expanded. The bond cast was 0.08 to 0.13 mm NiCrAlY with 0.38 mm of ZrO2-8Y2O3 ceramic. Upon pressurization, the tube substrate yielded and overstressed the coatings in tension. The coatings cracked (i.e., they failed) but did not come off the tube. These results demonstrate that tensile failure of plasma-sprayed coatings is not catastrophic as is compressive failure, which leads to spallation.
    Keywords: NONMETALLIC MATERIALS
    Type: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 8; 583-595
    Format: text
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  • 6
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    Evaluation of seals for high-performance cryogenic turbomachines (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approach to computing flow and dynamic characteristics for seals or bearings is discussed. The local average velocity was strongly influenced by inlet and exit effects and fluid injection, which in turn drove zones of secondary flow. For the restricted three-dimensional model considered, the integral averaged results were in reasonable agreement with selected data. Unidirectional pressure measurements alone were insufficient to define such flow variations. However, for seal and bearing leakage correlations the principles of corresponding states were found to be useful. Also discussed are three phenomena encountered during testing of three eccentric nonrotating seal configurations for the Space Shuttle Main Engine (SSME) Program. Fluid injection, choking within a seal, and pressure profile crossover are related to postulated zones of secondary flow or separation and to direct stiffness.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-88919 , E-3348 , NAS 1.15:88919
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  • 7
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    Monte Carlo Simulation of Sudden Death Bearing Testing (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Monte Carlo simulations combined with sudden death testing were used to compare resultant bearing lives to the calculated hearing life and the cumulative test time and calendar time relative to sequential and censored sequential testing. A total of 30 960 virtual 50-mm bore deep-groove ball bearings were evaluated in 33 different sudden death test configurations comprising 36, 72, and 144 bearings each. Variations in both life and Weibull slope were a function of the number of bearings failed independent of the test method used and not the total number of bearings tested. Variation in L10 life as a function of number of bearings failed were similar to variations in lift obtained from sequentially failed real bearings and from Monte Carlo (virtual) testing of entire populations. Reductions up to 40 percent in bearing test time and calendar time can be achieved by testing to failure or the L(sub 50) life and terminating all testing when the last of the predetermined bearing failures has occurred. Sudden death testing is not a more efficient method to reduce bearing test time or calendar time when compared to censored sequential testing.
    Keywords: Mechanical Engineering
    Type: NASA/TM-2003-212506 , E-14065 , STLE-2003-121 , International Joint Tribology Conference; Oct 27, 2003 - Oct 29, 2003; Ponte Vedra, FL; United States
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  • 8
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    Determination of Rolling-Element Fatigue Life From Computer Generated Bearing Tests (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two types of rolling-element bearings representing radial loaded and thrust loaded bearings were used for this study. Three hundred forty (340) virtual bearing sets totaling 31400 bearings were randomly assembled and tested by Monte Carlo (random) number generation. The Monte Carlo results were compared with endurance data from 51 bearing sets comprising 5321 bearings. A simple algebraic relation was established for the upper and lower L(sub 10) life limits as function of number of bearings failed for any bearing geometry. There is a fifty percent (50 percent) probability that the resultant bearing life will be less than that calculated. The maximum and minimum variation between the bearing resultant life and the calculated life correlate with the 90-percent confidence limits for a Weibull slope of 1.5. The calculated lives for bearings using a load-life exponent p of 4 for ball bearings and 5 for roller bearings correlated with the Monte Carlo generated bearing lives and the bearing data. STLE life factors for bearing steel and processing provide a reasonable accounting for differences between bearing life data and calculated life. Variations in Weibull slope from the Monte Carlo testing and bearing data correlated. There was excellent agreement between percent of individual components failed from Monte Carlo simulation and that predicted.
    Keywords: Structural Mechanics
    Type: NASA/TM-2003-212186 , E-13789 , NAS 1.15:212186 , 2003 Annual Meeting and Exhibition; Apr 28, 2003 - May 01, 2003; New York City, NY; United States
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  • 9
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    Probabilistic Analysis for Comparing Fatigue Data Based on Johnson-Weibull Parameters (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Leonard Johnson published a methodology for establishing the confidence that two populations of data are different. Johnson's methodology is dependent on limited combinations of test parameters (Weibull slope, mean life ratio, and degrees of freedom) and a set of complex mathematical equations. In this report, a simplified algebraic equation for confidence numbers is derived based on the original work of Johnson. The confidence numbers calculated with this equation are compared to those obtained graphically by Johnson. Using the ratios of mean life, the resultant values of confidence numbers at the 99 percent level deviate less than 1 percent from those of Johnson. At a 90 percent confidence level, the calculated values differ between +2 and 4 percent. The simplified equation is used to rank the experimental lives of three aluminum alloys (AL 2024, AL 6061, and AL 7075), each tested at three stress levels in rotating beam fatigue, analyzed using the Johnson- Weibull method, and compared to the ASTM Standard (E739 91) method of comparison. The ASTM Standard did not statistically distinguish between AL 6061 and AL 7075. However, it is possible to rank the fatigue lives of different materials with a reasonable degree of statistical certainty based on combined confidence numbers using the Johnson- Weibull analysis. AL 2024 was found to have the longest fatigue life, followed by AL 7075, and then AL 6061. The ASTM Standard and the Johnson-Weibull analysis result in the same stress-life exponent p for each of the three aluminum alloys at the median, or L(sub 50), lives
    Keywords: Statistics and Probability
    Type: NASA/TP-2013-217633 , E-16056-2 , International Design Engineering Technical Conferences and Computers and Information in Engineering Conference; Sep 04, 2007 - Sep 07, 2007; Las Vegas, NV; United States
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  • 10
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    Determination of Turboprop Reduction Gearbox System Fatigue Life and Reliability (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Two computational models to determine the fatigue life and reliability of a commercial turboprop gearbox are compared with each other and with field data. These models are (1) Monte Carlo simulation of randomly selected lives of individual bearings and gears comprising the system and (2) two-parameter Weibull distribution function for bearings and gears comprising the system using strict-series system reliability to combine the calculated individual component lives in the gearbox. The Monte Carlo simulation included the virtual testing of 744,450 gearboxes. Two sets of field data were obtained from 64 gearboxes that were first-run to removal for cause, were refurbished and placed back in service, and then were second-run until removal for cause. A series of equations were empirically developed from the Monte Carlo simulation to determine the statistical variation in predicted life and Weibull slope as a function of the number of gearboxes failed. The resultant L(sub 10) life from the field data was 5,627 hr. From strict-series system reliability, the predicted L(sub 10) life was 774 hr. From the Monte Carlo simulation, the median value for the L(sub 10) gearbox lives equaled 757 hr. Half of the gearbox L(sub 10) lives will be less than this value and the other half more. The resultant L(sub 10) life of the second-run (refurbished) gearboxes was 1,334 hr. The apparent load-life exponent p for the roller bearings is 5.2. Were the bearing lives to be recalculated with a load-life exponent p equal to 5.2, the predicted L(sub 10) life of the gearbox would be equal to the actual life obtained in the field. The component failure distribution of the gearbox from the Monte Carlo simulation was nearly identical to that using the strict-series system reliability analysis, proving the compatibility of these methods.
    Keywords: Aircraft Design, Testing and Performance
    Type: NASA/TM-2007-215019 , E-15467-1
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