Thoughts on inquiries in physical and inner worlds

[+] Author and Article Information
VJ Modi

Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada V6T 1Z4; modi@mech.vbc.ca

Appl. Mech. Rev 56(2), R9-R18 (Mar 04, 2003) doi:10.1115/1.1511738 History: Online March 04, 2003

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Grahic Jump Location
A chart showing the variation of environmental torques with altitude on GEOS-A satellite. Note, at the geostationary altitude of 22,300 miles (36,000 km) used by communications satellites, solar pressure and gravitational torques are of the same order of magnitude. Similarly, for near earth satellites, the aerodynamic force has dominant effects.
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Response of a spinning satellite showing significance of various system parameters. Note, the solar pressure parameter is as important as other system variables traditionally used in the spacecraft design.
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A schematic representation of an invariant surface
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Effect of the solar radiation pressure parameter C on the limiting invariant surface representing the bound of stability. A significant reduction in the stability region is apparent for higher C: e=0.1,Ki=1, ϕ=solar aspect angle=0. θ represents the true anomaly.
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Schematic diagrams of bodies with the Moving Surface Boundary-layer Control (MSBC) used in the study: a) slender geometry represented by an airfoil; and b) bluff bodies.
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Plots to assess relative influence of different configurations studied on the lift and stall characteristics
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Representative flow visualization pictures showing, rather dramatically, successful control of the boundary-layer separation through momentum injection
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Application of the MSBC to reduce drag of barges
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A simplified schematic diagram of a flexible platform with the Mobile Servicing System (MSS): Dynamics and control of this class of systems represent problems never encountered before.




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