Non-probabilistic Reliability Analysis for Supercavitating Projectile Based on Dynamic Stability

doi:10.3969/j.issn.1000-1093.2012.08.017

Abstract

Abstract: Aimed at the axial disturbed load to the head of supercavitating projectile at high speed motion underwater, its indefiniteness was considered, and the structure reliability of supercavitating projectile was analyzed on the basis of dynamic stability. The partial differential dynamic equation of the projectile's cut-off-cone structure was established, then it was transformed to a second-order ordinary differential Mathieu equation, and the numerical calculation for the dynamic stability of supercavitating structure was performed with Bolotin method，finally, the dynamic stability safety margin equations of supercavitating structure was given. The influences of length-diameter ratio, velocity and length of supercavitating projectile on the dynamic stability were analyzed. Based on those, the structural non-probabilistic reliability was analyzed and obtained, the effectiveness of the method was demonstrated by using some examples.

Key words: mathematical statistics, supercavitating projectile, dynamic stability, parametric resonance, non-probabilistic reliability

CLC Number:

O342

SONG Xiang-hua， AN Wei-guang， JIANG Yun-hua. Non-probabilistic Reliability Analysis for Supercavitating Projectile Based on Dynamic Stability[J]. Acta Armamentarii, 2012, 33(8): 997-1003.

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