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  • 1
    Digitale Medien
    Digitale Medien
    Viscosity of Gaseous HFC-143a (1,1,1-trifluoroethane) Under High Pressures (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 435-443 
    Details
    ISSN: 1572-9567
    Schlagwort(e): corresponding states ; HFC-143a ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The viscosity of gaseous HFC-143a(1,1,1-trifluoroethane) was measured with an oscillating-disk viscometer of the Maxwell type at temperatures from 298.15 to 423.15 K and at pressures up to the saturated vapor pressure at each temperature under subcritical conditions or up to 9 MPa under supercritical conditions. Intermolecular potential parameters of HFC-143a for the extended corresponding states were determined from the viscosity data at 0.1 MPa. An empirical viscosity equation as functions of temperature and density is proposed to interpolate the present experimental results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022696702673
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Viscosity of Gaseous HFC-125 (Pentafluoroethane) Under High Pressures (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 445-453 
    Details
    ISSN: 1572-9567
    Schlagwort(e): corresponding states ; HFC-125 ; oscillating-disk viscometer ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper reports experimental results lor the viscosity of gaseous HFC-125 (pentafluoroethane) under high pressures. The measurements were carried out with an oscillating-disk viscometer of the Maxwell type at temperatures from 298.15 to 423.15 K and at pressures up to the saturated vapor pressures at each temperature at subcritical conditions or up to 9 MPa at supercritical temperatures. Intermolecular scaling parameters of HFC-125 for the extended corresponding states were determined from the viscosity data at 0.1 MPa. An empirical viscosity equation is proposed to interpolate the present experimental results as a function of temperature and density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022648819511
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Viscosity of Gaseous HCFC-123 (2,2-Dichloro-1,1,1-Trifluoroethane) in the Temperature Range from 323.15 to 423.15 K and at Pressures up to 2 MPa (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 695-701 
    Details
    ISSN: 1572-9567
    Schlagwort(e): HCFC-123 ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The viscosity of gaseous HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane) was measured with an oscillating-disk viscometer of the Maxwell type at temperatures from 323.15 to 423.15 K and at pressures up to the saturated vapor pressure at each temperature in subcritical conditions or up to 2 MPa under supercritical conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006641502777
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 4
    Digitale Medien
    Digitale Medien
    Viscosity of nitrous oxide in the critical region (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 603-626 
    Details
    ISSN: 1572-9567
    Schlagwort(e): critical anomaly ; mode-coupling theory ; nitrous oxide ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The gaseous viscosity of nitrous oxide (N2O) was measured in the critical region. The experimental temperature range was between 309.650 and 318.150 K and the pressure range was up to 9.6 MPa. The measurements were obtained with an oscillating-disk viscometer, combined with local determination of the density at the position of the oscillating disk, and they have an estimated accuracy of 0.6 % for viscosity and 0.5 % for gas density. The viscosity of N2O exhibits an anomalous increase near the critical point. The anomalous increase in viscosity was analyzed with the viscosity equation proposed by Basu and Sengers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01563790
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Viscosity of Gaseous HFC-134a (1,1,1,2-Tetrafluoroethane) Under High Pressures (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 1285-1295 
    Details
    ISSN: 1572-9567
    Schlagwort(e): HFC-134a ; Lennard–Jones potential ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The viscosity of gaseous HFC-134a (1,1,1,2-tetrafluoroethane) was measured with an oscillating disk viscometer of the Maxwell type from 298.15 to 398.15 K at pressures up to 5.5 MPa. Intermolecular potential parameters for the Lennard–Jones 12-6 model were determined from the viscosity data at 0.1 MPa. The viscosity equation developed by Krauss et al. was applied to correlate the present viscosity data. In addition, the correlations proposed by Stiel and Thodos and by Lee and Thodos were tested for fitting the experimental viscosity data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021919215793
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 6
    facet.materialart.
    Unbekannt
    On the design of decoupling controllers for advanced rotorcraft in the hover case (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A methodology for design of helicopter control systems is proposed that can account for various types of concurrent specifications: stability, decoupling between longitudinal and lateral motions, handling qualities, and physical limitations of the swashplate motions. This is achieved by synergistic use of analytical techniques (Q-parameterization of all stabilizing controllers, transfer function interpolation) and advanced numerical optimization techniques. The methodology is used to design a controller for the UH-60 helicopter in hover. Good results are achieved for decoupling and handling quality specifications.
    Schlagwort(e): AIRCRAFT STABILITY AND CONTROL
    Materialart: AIAA PAPER 91-0421
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unbekannt
    A model for active control of helicopter air resonance in hover and forward flight (1988)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A coupled rotor/fuselage helicopter analysis is presented. The accuracy of the model is verified by comparing it with the experimental data. The sensitivity of the open loop damping of the unstable air resonance mode to such modeling effects as blade torsional flexibility, unsteady aerodynamics, forward flight, periodic terms, and trim solution is illustrated by numerous examples. Subsequently, the model is used in conjunction with linear optimal control theory to stabilize the air resonance mode. The influence of the modeling effects mentioned before on active air resonance control is then investigated.
    Schlagwort(e): AIRCRAFT STABILITY AND CONTROL
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unbekannt
    Helicopter air resonance modeling and suppression using active control (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: A coupled rotor/fuselage helicopter analysis with the important effects of blade torsional flexibility, unsteady aerodynamics, and forward flight is presented. Using this mathematical model, a nominal configuration is selected with an air resonance instability throughout most of its flight envelope. A multivariable compensator is then designed using two swashplate inputs and a single-body roll rate measurement. The controller design is based on the linear quadratic Gaussian technique and the loop transfer recovery method. The controller is shown to suppress the air resonance instability throughout a wide range of helicopter loading conditions and forward flight speeds.
    Schlagwort(e): AIRCRAFT STABILITY AND CONTROL
    Materialart: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 14; 1294-130
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unbekannt
    A simple active controller to suppress helicopter air resonance in hover and forward flight (1989)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: A coupled rotor/fuselage helicopter analysis with the important effects of blade torsional flexibility, unsteady aerodynamics, and forward flight is presented. This model is used to illustrate the effect of unsteady aerodynamics, forward flight, and torsional flexibility on air resonance. Next, a nominal configuration, which experiences air resonance in forward flight, is selected. A simple multivariable compensator using conventional swashplate inputs and a single body roll rate measurement is then designed. The controller design is based on a linear estimator in conjunction with optimal feedback gains, and the design is done in the frequency domain using the loop-transfer recovery method. The controller is shown to suppress the air resonance instability throughout wide range helicopter loading conditions and forward flight speeds.
    Schlagwort(e): AIRCRAFT STABILITY AND CONTROL
    Materialart: IUTAM/IFAC Symposium on Dynamics of Controlled Mechanical Sytems; May 30, 1988 - Jun 03, 1988; Zurich; Switzerland
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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