Improvement and Parameter Identification of Correction Force Model for Fixed-canard Guidance Kit

doi:10.3969/j.issn.1000-1093.2019.02.005

Abstract

Abstract: The attitude of fixed canard dual-spin trajectory correction projectile is changed by adjusting the phase angle of fixed canard to control the direction of correction force. An exact correction force model of precision guidance kit is the key to improve the correction accuracy of the correction projectile. The validity of the numerical calculation is verified on the basis of wind tunnel test. Based on the small disturbance theory, a modified correct force model of guidance kit is established for the correction projectile with four canards. Levenberg-Marquardt algorithm is used to identify the parameters of the modified correction force model based on the data of computational fluid dynamics（CFD）. The results show that y and z directions vary sinusoidally with phase angle in the correction force model based on four canards. The disturbance coefficient of warhead is insensitive to the angle of attack at a given Mach number. The change of disturbance coefficient with angle of attack is less than 4.9%. The residual sum of squares of correction forces in y and z directions in the proposed modified correction force model is smaller than that in the existing model. The calculated results of correction force model of guidance kit are in good agreement with CFD calculations. Key

Key words: dual-spinprojectile, asymmetricalcanard, aerodynamiccharacteristic, guidancekit

CLC Number:

TJ011⁺.3

FENG Bin， YU Jiyan， WANG Yu， WANG Xiaoming， JU Tan. Improvement and Parameter Identification of Correction Force Model for Fixed-canard Guidance Kit[J]. Acta Armamentarii, 2019, 40(2): 257-264.

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第40卷
第2期2019 年2月兵工学报ACTA
ARMAMENTARIIVol.40No.2Feb.2019

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