... Authors: Stanley, Douglas O.; Engelund, Walter C.; Lepsch, Roger A.; McMillin, Mark; Wurster,... more ... Authors: Stanley, Douglas O.; Engelund, Walter C.; Lepsch, Roger A.; McMillin, Mark; Wurster, Kathryn E.; Powell, Richard W.; Guinta, Anthony A.; Unal, Resit. Affiliation: AA(NASA, Langley Research Center, Hampton, VA), AB(NASA, Langley Research Center, Hampton, VA), AC ...
... Authors: Wilhite, Alan W.; Bush, Lance B.; Cruz, Christopher I.; Lepsch, Roger A.; Morris, W.... more ... Authors: Wilhite, Alan W.; Bush, Lance B.; Cruz, Christopher I.; Lepsch, Roger A.; Morris, W. Douglas; Stanley, Douglas O.; Wurster, Kathryn E. Affiliation: AA(NASA, Langley Research Center,Hampton, VA), AB(NASA, Langley Research Center, Hampton, VA), AC(NASA ...
ABSTRACT Over the past several years there has been a significant effort within the United States... more ABSTRACT Over the past several years there has been a significant effort within the United States to assess options to replace the Space Shuttle some time after the turn of the century. In order to provide a range of technology options, a wide variety of vehicle types and propulsion systems have been examined. These vehicle concepts which are representative of the classes of concepts mat could be proposed for any future vehicle development is being used in the initial phase of the access to space activity to identify requirements for the technology maturation effort and to assess approaches to achieve the required low operations cost. This paper provides the results of recent systems analyses and describes the ongoing technology maturation and demonstration program supporting the Reusable Launch Vehicle Program.
Safe, reliable, and affordable access to low-Earth (LEO) orbit is necessary for all of the United... more Safe, reliable, and affordable access to low-Earth (LEO) orbit is necessary for all of the United States' (US) space endeavors. In 2010, NASA's Office of the Chief Technologist commissioned 14 teams to develop technology roadmaps that could be used to guide the Agency's and US technology investment decisions for the next few decades. The Launch Propulsion Systems Technology Area (LPSTA) team was tasked to address the propulsion technology challenges for access to LEO. The developed LPSTA roadmap addresses technologies that enhance existing solid or liquid propulsion technologies and their related ancillary systems or significantly advance the technology readiness level (TRL) of less mature systems like airbreathing, unconventional, and other launch technologies. In developing this roadmap, the LPSTA team consulted previous NASA, military, and industry studies as well as subject matter experts to develop their assessment of this field, which has fundamental technological and strategic impacts for US space capabilities.
... Therefore, experimental designs constructed to minimize variability of measurements may not b... more ... Therefore, experimental designs constructed to minimize variability of measurements may not be the best choice for computer experiments (Sacks, Welch, Mitchell and Wynn, 1989; Sacks, Schiller and Welch, 1989; Currin, Mitchell, Morris and Ylvisaker, 1991; Owen, 1991,1994 ...
... Authors: Engelund, Walter C.; Stanley, Douglas O.; Lepsch, Roger A.; McMillin, Mark M.; Unal,... more ... Authors: Engelund, Walter C.; Stanley, Douglas O.; Lepsch, Roger A.; McMillin, Mark M.; Unal, Resit. Affiliation: AA(NASA, Langley Research Center, Hampton, VA), AB(NASA, Langley Research Center, Hampton, VA), AC(NASA, Langley Research Center, Hampton, VA), AD ...
7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and Optimization, 1998
... The re-sponse surface methods discussed are central composite designs, Bayesian methods and D... more ... The re-sponse surface methods discussed are central composite designs, Bayesian methods and D-optimal designs. An over-determined D-optimal design is applied to a configuration design and optimization study of a wing-body, launch ve-hicle. ...
... Authors: Stanley, Douglas O.; Engelund, Walter C.; Lepsch, Roger A.; McMillin, Mark; Wurster,... more ... Authors: Stanley, Douglas O.; Engelund, Walter C.; Lepsch, Roger A.; McMillin, Mark; Wurster, Kathryn E.; Powell, Richard W.; Guinta, Anthony A.; Unal, Resit. Affiliation: AA(NASA, Langley Research Center, Hampton, VA), AB(NASA, Langley Research Center, Hampton, VA), AC ...
... Authors: Wilhite, Alan W.; Bush, Lance B.; Cruz, Christopher I.; Lepsch, Roger A.; Morris, W.... more ... Authors: Wilhite, Alan W.; Bush, Lance B.; Cruz, Christopher I.; Lepsch, Roger A.; Morris, W. Douglas; Stanley, Douglas O.; Wurster, Kathryn E. Affiliation: AA(NASA, Langley Research Center,Hampton, VA), AB(NASA, Langley Research Center, Hampton, VA), AC(NASA ...
ABSTRACT Over the past several years there has been a significant effort within the United States... more ABSTRACT Over the past several years there has been a significant effort within the United States to assess options to replace the Space Shuttle some time after the turn of the century. In order to provide a range of technology options, a wide variety of vehicle types and propulsion systems have been examined. These vehicle concepts which are representative of the classes of concepts mat could be proposed for any future vehicle development is being used in the initial phase of the access to space activity to identify requirements for the technology maturation effort and to assess approaches to achieve the required low operations cost. This paper provides the results of recent systems analyses and describes the ongoing technology maturation and demonstration program supporting the Reusable Launch Vehicle Program.
Safe, reliable, and affordable access to low-Earth (LEO) orbit is necessary for all of the United... more Safe, reliable, and affordable access to low-Earth (LEO) orbit is necessary for all of the United States' (US) space endeavors. In 2010, NASA's Office of the Chief Technologist commissioned 14 teams to develop technology roadmaps that could be used to guide the Agency's and US technology investment decisions for the next few decades. The Launch Propulsion Systems Technology Area (LPSTA) team was tasked to address the propulsion technology challenges for access to LEO. The developed LPSTA roadmap addresses technologies that enhance existing solid or liquid propulsion technologies and their related ancillary systems or significantly advance the technology readiness level (TRL) of less mature systems like airbreathing, unconventional, and other launch technologies. In developing this roadmap, the LPSTA team consulted previous NASA, military, and industry studies as well as subject matter experts to develop their assessment of this field, which has fundamental technological and strategic impacts for US space capabilities.
... Therefore, experimental designs constructed to minimize variability of measurements may not b... more ... Therefore, experimental designs constructed to minimize variability of measurements may not be the best choice for computer experiments (Sacks, Welch, Mitchell and Wynn, 1989; Sacks, Schiller and Welch, 1989; Currin, Mitchell, Morris and Ylvisaker, 1991; Owen, 1991,1994 ...
... Authors: Engelund, Walter C.; Stanley, Douglas O.; Lepsch, Roger A.; McMillin, Mark M.; Unal,... more ... Authors: Engelund, Walter C.; Stanley, Douglas O.; Lepsch, Roger A.; McMillin, Mark M.; Unal, Resit. Affiliation: AA(NASA, Langley Research Center, Hampton, VA), AB(NASA, Langley Research Center, Hampton, VA), AC(NASA, Langley Research Center, Hampton, VA), AD ...
7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and Optimization, 1998
... The re-sponse surface methods discussed are central composite designs, Bayesian methods and D... more ... The re-sponse surface methods discussed are central composite designs, Bayesian methods and D-optimal designs. An over-determined D-optimal design is applied to a configuration design and optimization study of a wing-body, launch ve-hicle. ...
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Papers by Roger Lepsch