Abstract
The paper investigates the individual and combined effects of disturbance factors including thrust misalignment, the offset of the centre of gravity and misalignment of the principal axes of inertia on falling point distribution of a type of unguided rocket (fin-stabilized rockets with single-stage solid-propellant rocket engines). The mathematical model used in the paper is developed from an available rocket motion model and solved for a representative rocket which is BM-21 rocket. The obtained results show dependencies of falling point deviation on disturbance parameters. These dependencies agree with the standard data given in the firing table; in addition, they are fuller and more insight ful than the previous research.
Highlights
Due to manufacturing and assembly errors, it is difficult for rockets to avoid thrust misalignment and mass distribution asymmetry
Mass distribution asymmetry is characterized by the offset of the centre of gravity (CG offset) and the principal axes of inertia (PAIs misalignment)
This shows that horizontal-MI has little effect on deviations; longitudinal-MI has a great effect on lateral deviation and little effect on range deviation at this firing angle
Summary
Due to manufacturing and assembly errors, it is difficult for rockets to avoid thrust misalignment and mass distribution asymmetry. PAIs misalignment occurs due to the uneven distribution of rocket mass along the length of a rocket. These misalignments cause the rocket’s falling points deviation from the standard falling point, so they affect the firing accuracy. The effect of thrust misalignment and CG offset on rocket motion in the air is investigated in [1]. The combined effect of each pair of two or all three disturbance factors on the falling point distribution was done. This investigation is done for each firing angle and for the variable firing angle in the range from 5° to 50°. The investigation results are significant in predicting the firing accuracy, so that the right rockets can be selected for the firing process
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