DYNAMIC STABILITY AND INFLUENCE FACTORS OF THE WHOLE TRAJECTORY OF FIXED CANARD DUAL-SPIN PROJECTILES

Zhao Xinxin; Shi Jinguang; Wang Zhongyuan; Zhang Ning

doi:10.6052/0459-1879-21-636

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Zhao Xinxin, Shi Jinguang, Wang Zhongyuan, Zhang Ning. Dynamic stability and influence factors of the whole trajectory of fixed canard dual-spin projectiles. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(5): 1364-1374 doi: 10.6052/0459-1879-21-636

Citation:

Zhao Xinxin, Shi Jinguang, Wang Zhongyuan, Zhang Ning. Dynamic stability and influence factors of the whole trajectory of fixed canard dual-spin projectiles. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(5): 1364-1374 doi: 10.6052/0459-1879-21-636

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DYNAMIC STABILITY AND INFLUENCE FACTORS OF THE WHOLE TRAJECTORY OF FIXED CANARD DUAL-SPIN PROJECTILES

doi: 10.6052/0459-1879-21-636

School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Received Date: 2021-12-01
Accepted Date: 2022-02-20

Available Online: 2022-02-21

Abstract

Abstract

To research the dynamic stability of fixed canard dual-spin projectiles in full trajectory flight, the state space model of the complex attack angle motion is established under the condition of small attack angle, and the general condition that the real parts of the characteristic roots are all negative is derived by using the Hurwitz method. Based on the motion characteristics of the front body’s rolling angle before/after starting control, the dynamic stability criterion of fixed canard dual-spin projectiles under different flight conditions is proposed by using the stability analysis method of the conventional rotating projectiles, whose form is similar to that of the conventional rotating projectiles. When flying without control, the control force and moment terms of control canard are added correspondingly in the lift force and static moment terms. Controlled flight further increases the relative increment effect of relevant terms. Accordingly, the constraint on canard parameters of control surface is deduced under the condition that the parameters of projectile body are determined, the effects of the control force coefficient’s derivative, the installation position and the deflection angle of control canard on the dynamic stability are discussed, and the reasons for the formation of the dynamic instability of this kind of projectile are revealed. The simulation analysis results of the complex attack angle motion under different conditions show that when the relative increment caused by control surface is within the boundary of both uncontrolled and controlled flight, the full trajectory flight of the fixed canard dual-spin projectile is dynamically stable, which verifies that the dynamic stability criterion and the constraint on canard parameters deduced in this paper are reasonable and feasible, and provides a theoretical basis and design reference for the design and development of this type of projectile.
- dual-spin projectile,
- fixed canard,
- dynamic stability,
- Hurwitz method,
- constraint on canard parameters

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References(31)

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