The National Aeronautics Space Administration (NASA) Vision for Space Exploration (VSE) is focused on robotic & manned return missions to the Moon, Mars, and beyond. Several of the mission architectures proposed h...
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ISBN:
(纸本)1563479079
The National Aeronautics Space Administration (NASA) Vision for Space Exploration (VSE) is focused on robotic & manned return missions to the Moon, Mars, and beyond. Several of the mission architectures proposed have utilized the production of propellant, from materials found on the Moon or Mars, as a means of increasing performance while reducing overall mission cost and risk. One such architecture involves a Mars-Based In-Situ Propellant System (ISPP) that utilizes carbon dioxide (CO2) and hydrogen (H 2). While the hydrogen would need to be transported from Earth, carbon dioxide is abundant in the Martian atmosphere. Ultimately, this system could produce oxygen (O2), for breathing or propellant, and methane (CH4), as propellant. This paper presents a strategy for utilizing a low weight, low cost microchannel-based ISPP system, enabling a diverse array of robotic Mars mission architectures that are capable of making high impact near term scientific discoveries-all while reducing the risk for larger Mars Sample Return or Human scale missions, farther in the future.
作者：
COMSTOCK, ENKEANE, RGMr. Edward N. Comstock is currently Head of the Surface Ship Hydrodynamics Section (SEA 32132) of the Hull Form Design
Performance and Stability Branch Naval Sea Systems Command. He received his B.S.E. degree in Naval Architecture and Marine Engineering in 1970 and his M.S. degree in Ship Hydrodynamics in 1974 both from the University of Michigan. Mr. Comstock began his professional career with the U.S. Navy in 1974 as a Seakeeping Specialist in the Hull Form and Fluid Dynamics Branch of the former Naval Ship Engineering Center
being involved in improving the design of naval ships through the integration of R&D technology advances into the ship design process. His efforts prior to 1980 were mainly aimed at developing and establishing Seakeeping Performance Assessment and Design Practices. Other responsibilities have included numerous ship performance investigations in still water and in the sea environment in support of ship design and specific Fleet problems. Prior to his employment by the Navy he worked in the Structural and Hydrodynamic Groups of General Dynamics' Electric Boat Division. There his activities spanned the areas of Submarine structural and Hydrodynamic Design and Construction. A member of ASNE since 1978. he is also a member of ASE and SNAME and has been active in supporting the efforts of the SNAME H-7 (Seakeeping) Panel the National Science Foundation (NSF). and the NATO Naval Armaments Group 6/Sub-Group 5 (Seakeeping). Mr. Robert G. Keane
Jr. is presently Head of the Hull Form Design. Performance and Stability Branch (SEA 3213). Ship Design and Integration Directorate (SEA 03). Naval Sea Systems Command (NAVSEA). He received his B.E.S. degree in Mechanical Engineering from The Johns Hopkins University in 1962. his M.S. degree in Mechanical Engineering from the Stevens Institute of Technology in 1967. and his M.S.E. degree in Naval Architecture from the University of Michigan in 1970. Additionally he has done graduate work in Management Science and Operations Research at The Johns Ho
“Seakeeping … is the ability of our ships to go to sea, and Successfully and safely execute their missions despite adverse environmental factors.” — VAdm. R.E. Adamson. USN In June 1975, VAdm. R.E. Adamson, USN, t...
“Seakeeping … is the ability of our ships to go to sea, and Successfully and safely execute their missions despite adverse environmental factors.” — VAdm. R.E. Adamson. USN In June 1975, VAdm. R.E. Adamson, USN, then Commander Naval Surface Forces, U.S. Atlantic Fleet, addressed the participants of the Seakeeping Workshop [1] and established what has come to be a most profound definition of seakeeping as it relates to the U.S. Navy. In those few words he identified the two major issues facing the operator today and provided the focus for all subsequent seakeeping efforts within the design community at the Naval Sea Systems Command (NAVSEA). For it is these two hues of mission sum and safety at sea which are addressed within NAVSEA, for each new ship design and for ships in the Fleet, in terms of: SEAKEEPING PERFORMANCE — Ability to execute mission in a sea environment, and SEAWORTHINESS — Ability to survive in an extreme sea environment. In the past, the design of ships exhibiting superior seakeeping performance and seaworthiness and seaworthiness has been looked upon by many as an art or an academic exercise. The objective of this paper then is to demonstrate clearly that the ability of our ships to execute their missions successfully and safely in a sea environment is not by chance but by design.
作者：
JOHNSON, RACARACOSTAS, NPCOMSTOCK, ENMr. Robert A. Johnson is currently a Naval Architect in the Hull Group (SEA 32)
Ship Design and Integration Directorate Naval Sea Systems Command. He received his Associate in Engineering degree in Drafting and Design Technology in 1959 his B.S. degree in Aerospace Engineering in 1965 and his M.S. degree in Engineering Mechanics in 1970 all from Pennsylvania State University. In 1973
he was selected for the Navy's Long-Term Training Program at the University of Michigan from which he received his M.S.E. degree in Naval Architecture in 1974. Mr. Johnson began his professional career at the Ordnance Research Laboratory Pennsylvania State University in 1959 where he was involved in the design of hydroelastic submarine models and conducted research in the area of flow-induced structural vibrations. Subsequently he joined HRB-Singer at State College Pennsylvania in 1967 as a Research Engineer and in 1969 joined the former Naval Ship Engineering Center (NAVSEC) where he was employed in the Submarine Structures Branch Surface Ship Structures Branch and the Performance and Stability Branch of the Hull Division. Currently he is the CASDAC Hull System Technical Director and also Head of the Surface Ship Hydrodynamics Section (SEA 32133) Naval Architecture Division Naval Sea Systems Command a member of ASE
SNAME and Tau Beta Pi and one of the Navy Subcommittee Members of the Ship Structures Committee.Mr. Nicholas P. Casacostas is currently a Section Chief for Naval Architecture in the Washington
D.C. office of M. Rosenblatt & Son Inc. His professional career has been in both Navy and commercially related fields and he has had published several technical papers dealing with the subjects of Ship Propulsion and Hydrodynamics as well as Shipping Economics and Operations. A member of ASNE since 1977 he also is a member of the Royal Institute of Naval Architects and SNAME and presently serving on the latter's H-2 (Resistance and Propulsion) Panel. Mr. Edward N. Comstock is currently a Seakeeping Speciali
The recent trend in Naval Forces has been a shrinking Fleet in both numbers and ship size. This dictates that our ships must have greater operational effectiveness if the Navy is to continue to carry out its mission i...
The recent trend in Naval Forces has been a shrinking Fleet in both numbers and ship size. This dictates that our ships must have greater operational effectiveness if the Navy is to continue to carry out its mission in the future as it has done in the past. The seakeeping performance of a ship is a major determinant of its overall operational effectiveness. The methodology presented in this paper is a comprehensive approach to the evaluation of a ship's seakeeping performance. The scope of this methodology encompasses the assessment of ship mission scenarios and the relative importance of associated mission requirements as well as the probabilistic description of the uncertainties imposed by the variable ocean environment. The methodology is presented in a general sense so that the seakeeping performance of a ship's configuration can be evaluated as a function of mission scenario, mission area, sea state, ship heading, and speed. In order to utilize the full potential of the methodology, more refined scenario descriptions and more accurate environment specifications must be obtained. A simplified example is presented in which a comparison of the operational effectiveness of two small hull forms is made, using information now available to the designer. It is anticipated that the methodology presented can be used not only as a powerful tool in the decision-making process of practical ship design, but also as the basis for parametric studies of mission strategies.
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