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  • 1
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    Technical Assessment of the National Full Scale Aerodynamic Complex Fan Blades Repair (1998)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report describes the principal activities of a technical review team formed to address National Full Scale Aerodynamic Complex (NFAC) blade repair problems. In particular, the problem of lack of good adhesive bonding of the composite overwrap to the Hyduliginum wood blade material was studied extensively. Description of action plans and technical elements of the plans are provided. Results of experiments designed to optimize the bonding process and bonding strengths obtained on a full scale blade using a two-step cure process with adhesive primers are presented. Consensus recommendations developed by the review team in conjunction with the NASA Ames Fan Blade Repair Project Team are provided along with lessons learned on this program. Implementation of recommendations resulted in achieving good adhesive bonds between the composite materials and wooden blades, thereby providing assurance that the repaired fan blades will meet or exceed operational life requirements.
    Keywords: Research and Support Facilities (Air)
    Type: NASA/TM-1998-206932 , NAS 1.15:206932 , L-17701
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Structural damping studies at cryogenic temperatures (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Results of an engineering study to measure changes in structural damping properties of two cryogenic wind tunnel model systems and two metallic test specimens at cryogenic temperatures are presented. Data are presented which indicate overall, a trend toward reduced structural damping at cryogenic temperatures (-250 degrees F) when compared with room temperature damping properties. The study was focused on structures and materials used for model systems tested in the National Transonic Facility (NTF). The study suggests that the significant reductions in damping at extremely cold temperatures are most likely associated with changes in mechanical joint compliance damping rather than changes in material (solid) damping.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-109073 , NAS 1.15:109073
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Design and fabrication of instrumented composite airfoils for a cryogenic wind tunnel model (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two instrumented horizontal stabilizers and one instrumented vertical stabilizer were designed and fabricated for testing on the Pathfinder 1 (PF-1) Transport Model in the NASA Langley Research Center's National Transonic Facility (NTF). Two different designs were employed: the horizontal stabilizer utilized a metal spar and fiberglass overwrap and the vertical stabilizer was made of all fiberglass. All design requirements were met in terms of design loads, airfoil tolerances, surface finish, orifice hole quality, and proof-of-concept tests. Pressure tubing installation was found to be easier for these concepts as compared to methods used in conventional metallic models. Ease of repair was found to be a principal advantage in that some fabrication problems were overcome by reapplying fiberglass cloth and/or epoxy to damaged areas. Also, fabrication costs were judged to be lower when compared to the more conventional design fabrication costs.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-102740 , NAS 1.15:102740
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Braze alloy process and strength characterization studies for 18 nickel grade 200 maraging steel with application to wind tunnel models (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A comprehensive study of braze alloy selection process and strength characterization with application to wind tunnel models is presented. The applications for this study include the installation of stainless steel pressure tubing in model airfoil sections make of 18 Ni 200 grade maraging steel and the joining of wing structural components by brazing. Acceptable braze alloys for these applications are identified along with process, thermal braze cycle data, and thermal management procedures. Shear specimens are used to evaluate comparative shear strength properties for the various alloys at both room and cryogenic (-300 F) temperatures and include the effects of electroless nickel plating. Nickel plating was found to significantly enhance both the wetability and strength properties for the various braze alloys studied. The data are provided for use in selecting braze alloys for use with 18 Ni grade 200 steel in the design of wind tunnel models to be tested in an ambient or cryogenic environment.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-104075 , NAS 1.15:104075
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Structural integrity of wind tunnel wooden fan blades (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Information is presented which was compiled by the NASA Inter-Center Committee on Structural Integrity of Wooden Fan Blades and is intended for use as a guide in design, fabrication, evaluation, and assurance of fan systems using wooden blades. A risk assessment approach for existing NASA wind tunnels with wooden fan blades is provided. Also, state of the art information is provided for wooden fan blade design, drive system considerations, inspection and monitoring methods, and fan blade repair. Proposed research and development activities are discussed, and recommendations are provided which are aimed at future wooden fan blade design activities and safely maintaining existing NASA wind tunnel fan blades. Information is presented that will be of value to wooden fan blade designers, fabricators, inspectors, and wind tunnel operations personnel.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-104059 , NAS 1.15:104059
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Buffet test in the National Transonic Facility (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A buffet test of a commercial transport model was accomplished in the National Transonic Facility at the NASA Langley Research Center. This aeroelastic test was unprecedented for this wind tunnel and posed a high risk for the facility. Presented here are the test results from a structural dynamics and aeroelastic response point of view. The activities required for the safety analysis and risk assessment are described. The test was conducted in the same manner as a flutter test and employed on-board dynamic instrumentation, real time dynamic data monitoring, and automatic and manual tunnel interlock systems for protecting the model.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-189595 , NAS 1.26:189595
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Development of a model protection and dynamic response monitoring system for the national transonic facility (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A state-of-the-art, computerized mode protection and dynamic response monitoring system has been developed for the NASA Langley Research Center National Transonic Facility (NTF). This report describes the development of the model protection and shutdown system (MPSS). A technical description of the system is given along with discussions on operation and capabilities of the system. Applications of the system to vibration problems are presented to demonstrate the system capabilities, typical applications, versatility, and investment research return derived from the system to date. The system was custom designed for the NTF but can be used at other facilities or for other dynamic measurement/diagnostic applications. Potential commercial uses of the system are described. System capability has been demonstrated for forced response testing and for characterizing and quantifying bias errors for onboard inertial model attitude measurement devices. The system is installed in the NTF control room and has been used successfully for monitoring, recording and analyzing the dynamic response of several model systems tested in the NTF.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-195041 , NAS 1.26:195041
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Dynamic response characteristics of two transport models tested in the National Transonic Facility (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper documents recent experiences with measuring the dynamic response characteristics of a commercial transport and a military transport model during full scale Reynolds number tests in the National Transonic Facility. Both models were limited in angle of attack while testing at full scale Reynolds number and cruise Mach number due to pitch or stall buffet response. Roll buffet (wing buzz) was observed for both models at certain Mach numbers while testing at high Reynolds number. Roll buffet was more severe and more repeatable for the military transport model at cruise Mach number. Miniature strain-gage type accelerometers were used for the first time for obtaining dynamic data as a part of the continuing development of miniature dynamic measurements instrumentation for cryogenic applications. This paper presents the results of vibration measurements obtained for both the commercial and military transport models and documents the experience gained in the use of miniature strain gage type accelerometers.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-191420 , NAS 1.26:191420
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Effects of vibration on inertial wind-tunnel model attitude measurement devices (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Results of an experimental study of a wind tunnel model inertial angle-of-attack sensor response to a simulated dynamic environment are presented. The inertial device cannot distinguish between the gravity vector and the centrifugal accelerations associated with wind tunnel model vibration, this situation results in a model attitude measurement bias error. Significant bias error in model attitude measurement was found for the model system tested. The model attitude bias error was found to be vibration mode and amplitude dependent. A first order correction model was developed and used for estimating attitude measurement bias error due to dynamic motion. A method for correcting the output of the model attitude inertial sensor in the presence of model dynamics during on-line wind tunnel operation is proposed.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-TM-109083 , NAS 1.15:109083
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Buffet test in the National Transonic Facility (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A buffet test of a commercial transport model was accomplished in the National Transonic Facility at the NASA Langley Research Center. This aeroelastic test was unprecedented for this wind tunnel and posed a high risk to the facility. This paper presents the test results from a structural dynamics and aeroelastic response point of view and describes the activities required for the safety analysis and risk assessment. The test was conducted in the same manner as a flutter test and employed onboard dynamic instrumentation, real time dynamic data monitoring, automatic, and manual tunnel interlock systems for protecting the model. The procedures and test techniques employed for this test are expected to serve as the basis for future aeroelastic testing in the National Transonic Facility. This test program was a cooperative effort between the Boeing Commercial Airplane Company and the NASA Langley Research Center.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AIAA PAPER 92-4032
    Format: text
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    NASA TECHNICAL REPORTS
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