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  • 1
    Electronic Resource
    Electronic Resource
    On the nonlinear slewing dynamics and control of the Space Station based Mobile Servicing System (1995)
    Springer
    Nonlinear dynamics 7 (1995), S. 105-125 
    Details
    ISSN: 1573-269X
    Keywords: nonlinear dynamics ; slewing maneuvers ; Feedback Linearization Technique ; nonlinear control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A relatively general Lagrangian formulation for studying the nonlinear dynamics and control of space-craft with interconnected flexible members in a tree-type topology is developed. Versatility of the formulation is illustrated through a dynamical study of the Space Station based two-link Mobile Servicing System (MSS). The performance of the MSS undergoing inplane and out-of-plane slewing maneuvers is compared. Results indicate that, in absence of control, the maneuvers induce undesirable librational motion of the Space Station as well as vibration of the links. Nonlinear control, based on the Feedback Linearization Technique (FLT), appears promising. Quasi-Closed Loop Control (QCLC), a variation of the FLT, is applied to control the libration of the Space Station. Once the attitude of the Space Station is controlled, the performance of the MSS improves significantly. For a 5-minute maneuver of the MSS, the maximum control torque required is only 34.5 Nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045128
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    Paper (German National Licenses)
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  • 2
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    Experimental determination of Mercury's mass and oblateness (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The ratio of the mass of the sun to that of Mercury deduced from the first and third flybys of Mercury by Mariner 10 is 6,023,600 plus or minus 600 and 6,023,700 plus or minus 300, respectively. Additional analysis should improve these uncertainties by a factor of 2 to 5. Assuming an equatorial radius of 2439 km, the mean density of the planet is 5.44 g/cu cm. The gravitational oblateness deduced from the first encounter is discussed. Data received from the third encounter are better suited for this determination and yield J2 of 0.00008 plus or minus 0.00006. In addition, the third-encounter data are sensitive to local gravity effects or anomalies.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Plenary Meeting; Jun 08, 1976 - Jun 19, 1976; Philadelphia, PA
    Format: text
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    NASA TECHNICAL REPORTS
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