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dc.contributor.authorOlds, John R.en_US
dc.contributor.authorBudianto, Irene Arianti
dc.date.accessioned2006-03-17T15:59:56Z
dc.date.available2006-03-17T15:59:56Z
dc.date.issued1998-01
dc.identifier.urihttp://hdl.handle.net/1853/8431
dc.description36th Aerospace Sciences Meeting and Exhibit Reno, NV, January 1998.en_US
dc.description.abstractFuture space transportation vehicles may well rely on high speed airbreathing propulsion (ramjets and scramjets) to supply much of their motive power. Because of the tradeoff relationship between engine thrust and vehicle airframe weight, ascent trajectories are typically simulated using a constant dynamic pressure phase during airbreathing acceleration; dynamic pressure is increased to benefit vehicle thrust up to some fixed limit imposed by the vehicle structure. The constant dynamic pressure portion of the trajectory typically begins around Mach 2-3 and continues to the maximum airbreathing Mach number or until some convective aeroheating limit is reached. We summarize comparative research on three candidate guidance methods suitable for simulating constant dynamic pressure trajectories. These are generalized acceleration steering, linear feeedback control, and cubic polynomial control. All methods were implemented in POST (Program to Optimize Simulated Trajectories), an industry standard trajectory simulation code. Both quantitative and qualitative comparisons of these methods (i.e. in terms of computer processing time, number of required iterations for convergence, sensitivity to quality of initial values, accuracy and program robustness) are presented. Of the three methods, the linear feedback control approach is found to be the most efficient and robust, with good accuracy.
dc.format.extent313660 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.relation.ispartofseriesSSDL ; AIAA 98-0302en_US
dc.subjectSpace transportation system
dc.subjectAscent trajectories
dc.subjectDynamic pressure
dc.subjectTrajectory optimization
dc.subjectFeedback control
dc.subjectLinear control
dc.subjectAir-breathing engines
dc.subjectSpace programs
dc.subjectSpacecraft propulsion
dc.subjectMach number
dc.titleConstant Dynamic Pressure Trajectory Simulation in POSTen_US
dc.title.alternativeConstant dynamic pressure trajectory simulation with POST (Program to Optimize Simulated Trajectories of future space transportation vehicles)
dc.typePaper


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