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Monte Carlo investigation of thrust imbalance of solid rocket motor pairsThe Monte Carlo method of statistical analysis is used to investigate the theoretical thrust imbalance of pairs of solid rocket motors (SRMs) firing in parallel. Sets of the significant variables are selected using a random sampling technique and the imbalance calculated for a large number of motor pairs using a simplified, but comprehensive, model of the internal ballistics. The treatment of burning surface geometry allows for the variations in the ovality and alignment of the motor case and mandrel as well as those arising from differences in the basic size dimensions and propellant properties. The analysis is used to predict the thrust-time characteristics of 130 randomly selected pairs of Titan IIIC SRMs. A statistical comparison of the results with test data for 20 pairs shows the theory underpredicts the standard deviation in maximum thrust imbalance by 20% with variability in burning times matched within 2%. The range in thrust imbalance of Space Shuttle type SRM pairs is also estimated using applicable tolerances and variabilities and a correction factor based on the Titan IIIC analysis.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Sforzini, R. H.
(Auburn Univ. AL, United States)
Foster, W. A., Jr.
(Auburn University Auburn, Ala., United States)
Date Acquired
August 8, 2013
Publication Date
April 1, 1976
Publication Information
Publication: Journal of Spacecraft and Rockets
Volume: 13
Subject Category
Spacecraft Propulsion And Power
Accession Number
Distribution Limits

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