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A mass and cost estimating computerized methology for predicting advanced manned space vehicle weights and costs was developed. The user friendly methology designated MERCER (Mass Estimating Relationship-Cost Estimating Relationship) organizes the predictive process according to major vehicle subsystem levels. Design, development, test, evaluation,

Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/


Introducción



N90-2 998 WEIGHT ADVANCED AND COST FORECASTING FOR MANNED SPACE VEHICLES Final NASA-ASEE Summer Faculty Report Fellowship Program--1989 Prepared by: Raymond Academic Rank: Associate Professor Mississippi Computer Mathematics Itta Bena, Valley State Science and Department Mississippi 38941 University & Department: Williams, Ph.D NASA-JSC New Directorate: Initiatives Division: Advanced Definition JSC Date Projects Office Jared Colleague: August Submitted: NGT Contract: 25-1 R. Woodfill Ii, 44-001-800 1989 Office ABSTRACT The study develops a mass and cost estimating computerized methology for predicting advanced manned space vehicle weights and costs. The user friendly methology designated MERCER (Mass Estimating Relationship-Cost Estimating Relationship) organizes the predictive process according to major vehicle subsystem levels. Design, devlopment, test, evaluation, and flight hardware cost forecasting is treated by the study. This methodology consists of a complete set of mass estimating relationships (MERs) which serve as the control components for the model and cost estimating relationships (CERs) which use MER output as input. To develop this model, numerous _R and CER studies were surveyed and modified where required. Additionally, relationships were regressed from raw data to accomodate the methology. The models and formulations which estimated the cost of historical vehicles to within 20 percent of the actual cost were selected. The result of the research, along with components of the MERCERProgram, are reported. On the basis of the analysis, the following conclusions were established: (I) The cost of a spacecraft is best estimated by summing the cost of individual subsystems. (2) No one cost equation can be used for forecasting the cost of all spacecraft. (3) Spacecraft cost is highly correlated with its mass. (4) No study surveyed forecast vehicle found contained the cost that spacecraft linked sufficient and w...






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