Preliminary design of the third stage solid rocket motor for AUSROC nano

Redwood, Taylor (2012). Preliminary design of the third stage solid rocket motor for AUSROC nano B.Sc Thesis, School of Engineering, The University of Queensland.

       
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Author Redwood, Taylor
Thesis Title Preliminary design of the third stage solid rocket motor for AUSROC nano
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2012
Thesis type B.Sc Thesis
Supervisor Richard Morgan
Phillip Teakle
Mark Blair
Total pages 73
Language eng
Subjects 0901 Aerospace Engineering
09 Engineering
1007 Nanotechnology
Formatted abstract
Advances in technology have allowed satellites to provide much of the same function of older models while greatly reducing their mass. AUSROC Nano is the latest project of ASRI and aims to provide Australia with a nano satellite launch vehicle capable of launching a payload of approximately 10kg into low earth orbit. This thesis examines the preliminary design of the third stage solid rocket motor for AUSROC Nano with particular focus on the grain geometry design.

The restriction placed on the vehicle acceleration (under 15 g’s) and the relatively high delta v requirements (4256 m/s) of the stage cause conflicting design conditions. Furthermore, while previous projects have been undertaken they are protected under international trade regulations or intellectual property restrictions and as such are unavailable for literature review.

Initially a regressive grain geometry was developed – as shown in the figure below – along initial sizing of the case and insulation materials. The thermal protection required was equal to approximately 31% of the stage’s allocated inert weight. This did not leave enough weight to adequately design other components of the stage.
Additional design requirements were developed to prevent this problem; the rate of burn was limited to 7 mm/s, longitudinal burning was prohibited, and the acceleration limit was relaxed to 10 g’s. A number of new grain geometries were then developed although none were able to fulfil every requirement. The plus shaped grain shown below was the best solution, providing enough delta v but experiencing a maximum acceleration of 29 g’s.

Various other design ideas were developed; the material of the case should be a carbon fibre filament-wound design and rubber should be used as the insulation material. The propellant will be bonded to the casing and a commercial igniter will be procured and used in an aft internal design configuration.

The original overall AUSROC Nano design required the third stage to provide approximately 42.2% of the overall delta v. When this was split evenly between stages it was shown that it is possible to use the plus shaped grain design to fulfil all the design requirements including delta v and acceleration restrictions.

The core recommendation of this thesis is for a comprehensive analysis of the delta v requirements for each stage to be undertaken. This should be completed with a computational model that incorporates gravity considerations, non-vacuum operating conditions and mission specific requirements such as the acceleration restrictions. Once this is completed the third stage solid motor design should be continued using the grain analysis developed form this thesis.
Keyword Nanotechnolgy

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Mon, 08 Sep 2014, 13:08:59 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service