| Summary: | The accurate calculation of the burning surface during the grain burnback is the basis for the ballistic performance calculation of solid rocket motor. The overload conditions of the motor can significantly affect the burning surface area, grain burnback and internal ballistic performance of the motor. The minimum distance function (MDF) method is suitable for calculating the burnback process of complex three-dimensional grains, and has high precision. Based on the MDF method, this paper takes the common tube and star grain in engineering applications as the research object, and for the rocket motor working environment with high lateral overload, the burning surface area, grain burnback and internal ballistic performance of the motor are calculated and obtained. On this basis, the influence of overload on the burning surface area and internal ballistic performance of the motor is comprehensively analyzed.
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