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Design Optimization of Axi-symmetric Grain with Truncated Cone Bore and Aft End Has Cylinder Cutt-off and Section of End Burnind Grain in Solid Propellant Rocket Motor




Axi-Symmetric Grain, Solid Propellant Rocket Motor


In the present research work, Axi-symmetric grain with truncated cone bore and aft end has cylinder cut-off and section of end burning grain is used for optimization. The aim of this research work is to compare the result of developed optimization tool with solid rocket motor test results Ref. [1], computation results Ref. [2], and predesigned grain using its objectives and constraints. Here, Genetic Algorithm is used for optimization of grain. Genetic algorithm is able to finding the best solution in design space. Within the geometric constraints, firstly the design variables are selected randomly and grain designs are developed in the amount of population numbers. Genetic Algorithm does not require any initial guesses as in case of Complex Algorithm. In the present study objective function is evaluated in the number of population size at each generation; therefore, objective function is calculated 30 times at each generation. The objective function value of the found geometry after 40 generation is 6.2% and propellant mass is reduced by 16.3% as compared to the actual rocket motor test results. Objective function of the actual grain geometry is calculated as 11.2% for the given objective thrust –time curve. Therefore, the genetic algorithm, having a better curve fit with the objective thrust-time curve than actual grain geometry.

Other Details

Paper ID: IJSRDV4I90492
Published in: Volume : 4, Issue : 9
Publication Date: 01/12/2016
Page(s): 926-928

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