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The Effect of Mission Location on Mission Costs and Equivalent System MassEquivalent System Mass (ESM) is used by the Advanced Life Support (ALS) community to quantify mission costs of technologies for space applications (Drysdale et al, 1999, Levri et al, 2000). Mass is used as a cost measure because the mass of an object determines propulsion (acceleration) cost (i.e. amount of fuel needed), and costs relating to propulsion dominate mission cost. Mission location drives mission cost because acceleration is typically required to initiate and complete a change in location. Total mission costs may be reduced by minimizing the mass of materials that must be propelled to each distinct location. In order to minimize fuel requirements for missions beyond low-Earth orbit (LEO), the hardware and astronauts may not all go to the same location. For example, on a Lunar or Mars mission, some of the hardware or astronauts may stay in orbit while the rest of the hardware and astronauts descend to the planetary surface. In addition, there may be disposal of waste or used hardware at various mission locations to avoid propulsion of mass that is no longer needed in the mission. This paper demonstrates how using location factors in the calculation of ESM can account for the effects of various acceleration events and can improve the accuracy and value of the ESM metric to mission planners. Even a mission with one location can benefit from location factor analysis if the alternative technologies under consideration consume resources at different rates. For example, a mission that regenerates resources will have a relatively constant mass compared to one that uses consumables and vents/discards mass along the way. This paper shows examples of how location factors can affect ESM calculations and how the inclusion of location factors can change the relative value of technologies being considered for development.
Document ID
20040015097
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Fisher, John W.
(NASA Ames Research Center Moffett Field, CA, United States)
Levri, Julie A.
(NASA Ames Research Center Moffett Field, CA, United States)
Jones, Harry W.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Man/System Technology And Life Support
Report/Patent Number
SAE-2003-01-2633
Meeting Information
Meeting: 33rd International Conference on Environmental Systems
Location: Vancouver, British Columbia
Country: Canada
Start Date: July 7, 2003
End Date: July 10, 2003
Distribution Limits
Public
Copyright
Other

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