Design and Test of a Modified Passive Orbital Disconnect Strut (PODS-IV)
Passive Orbital Disconnect Struts (PODS) can potentially reduce the support conductance a factor of 10 over state-of-the-art tension band nondisconnect supports and can significantly reduce helium dewar weights without reducing lifetime. A series of thermal and structural tests have demonstrated this performance improvement. The major shortcoming of the PODS-III design is lack of side-load resistance to thermal shorting. This paper describes a design modification (PODS-IV) that dramatically increases the side-load resistance to shorting without significantly degrading thermal performance.
KeywordsSide Load Length Adjustment Differential Shrinkage Support Conductance Launch Tube
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- 1.R. T. Parmley, “Feasibility Study for Long Lifetime Helium Dewar,” NASA CR 166254 (Dec 1981)Google Scholar
- 2.R. T. Parmley, “Passive Orbital Disconnect Strut (PODS-III) Structural and Thermal Test Program,” NASA CR 166473 (Mar 1983)Google Scholar
- 3.R. T. Parmley, “Passive Orbital Disconnect Strut (PODS-III) Structural Test Program,” NASA CR 177325 (Jan 1985)Google Scholar
- 4.R. T. Parmley et al., “Test and Evaluate Passive Orbital Disconnect Struts (PODS-III),” NASA CR 177368 (Aug 1985)Google Scholar
- 5.I. E. Spradley, “Passive Orbital Disconnect Strut (PODS-IV) Development,” NASA CR 177426 (Sep 1986)Google Scholar
- 6.D. Bushness, “Optimum Design of Dewar Supports,” J. Spacecraft and Rockets, Vol. 22, 4:432 (Jul-Aug 1985 )Google Scholar
- 7.D. Bushnell, “Improved Optimum Design of Dewar Supports,” AIAA 28th SDM Meeting, Monterey, CA, (6–8 Apr 1987 )Google Scholar
- 8.G. N. Vanderplaats and F. Moses, Structural Optimization by Methods of Feasible Directions, Computers & Structures 3: 739–755 (1973)Google Scholar
- 9.G. N. Vanderplaats, “COMNIN-A FORTRAN Program for Constrained Function Minimization: User’s Manual,” NASA TM X-62,282, Ames Research Center, Moffett Field, CA (Aug 1973); version updated Mar 1975Google Scholar
- 10.G. Zoutendijk, “Methods of Feasible Directions,” Elsevier Publishing Co., Amsterdam (1960)Google Scholar