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Acta Armamentarii ›› 2013, Vol. 34 ›› Issue (9): 1103-1108.doi: 10.3969/j.issn.1000-1093.2013.09.008

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Synthesis and Characteristics of La0. 8 Sr0. 2 CoO3-δand Its Effect on Combustion Property of Nitramine Modified Double-base Propellant

WANG Jie-fang, AN Wei-guang, JIANG Yun-hua   

  1. Department of Aerospace Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China
  • Received:2012-09-09 Revised:2012-09-09 Online:2013-11-11
  • Contact: WANG Jie-fang E-mail:1014476499@ qq. Com

Abstract:

The vibration equation is developed by semi-analytical finite element method. The mode-decoupling and Fourier transform are used to deal with the vibration equation, and the expression of dynamic stiffness is obtained. Considering the randomness of structural parameters, the random expression of dynamic stiffness is deduced by Taylor expansion and the random factor method. The influences of random factors on the means and variation coefficient of dynamic stiffness are discussed. The calculation results show that the standard deviation of elastic modulus random factor has a significant influence on the randomness of dynamic stiffness, and if all other factors are equal and the standard deviation of elastic modulus random factor is doubled, the decreasing ratios of all dynamic stiffness mean values in three minimum points are 46. 7%, and are 27. 4% and 3. 6% for two maximum points in proper order. Furthermore, when the variability of structural parameters belongs to week degree, the variability of dynamic stiffness in extreme points belong to moderate degree, even strong degree.

Key words: solid mechanics, random parameters, supercavitating vehicle, random dynamic stiffness

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