Ballistic Endpoint Ide.pngication Based on Projectile Rotation Characteristics and Fuze Full Ballistic Safety Control Method

doi:10.12382/bgxb.2023.0883

Abstract

Abstract:

The complex flight environment may lead to an unintentional discharge of ammunition in the ready state. The motion equations are obtained and the decay law of projectile rotation velocity over time is established by employing the fourth-order Runge-Kutta algorithm to solve the six-degree-of-freedom rigid body trajectory equation. Experimental firing tests of a specific grenade are conducted, and the test data is collected to verify the zero-cross characteristic point of the second derivative of projectile rotation period. To investigate how the launch conditions such as firing charge and firing angle affect these characteristic points, an ide.pngication method based on rotating characteristic points for determining the ballistic endpoint moments is proposed. Additionally, a real-time ide.pngication system with magnetic field sensors for ballistic endpoints is designed and validated through firing range tests. The results demonstrate that the relative error between the ballistic endpoint ide.pngication system and a ballistic tracking radar is less than 5%, thus confirming the accuracy of the proposed method. On this basis a mechanical-electronic dual-mode full-trajectory safety control approach is proposed for rotationally stabilized munitions Based on the environmental information including recoil overload and rotational centrifugal force after launch, the endpoint ide.pngication is used as a third environmental factor to achieve the comprehensive fuze safety control throughout the entire trajectory. The proposed method of ide.pngying the ballistic endpoints and implementing the fuze safety control based on projectile rotation laws offers new possibilities for enhancing the overall ballistic safety of rotationally stabilized munitions.

Key words: spin-stabilized munitions, fuze, full ballistic safety control, rotation period, endpoint ide.pngication, second derivative

CLC Number:

TJ430

SHI Bo, CHEN Xi, LI Pengfei, HAN Ruoyu, QIN Sichao, HE Zhongzheng, SUN Haoyang. Ballistic Endpoint Ide.pngication Based on Projectile Rotation Characteristics and Fuze Full Ballistic Safety Control Method[J]. Acta Armamentarii, 2024, 45(9): 3105-3113.

Figures/Tables 16

References 21

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模型参数		发射气象条件
参数	数值	参数	数值
弹径/m	0.122		地面压强/kPa	100
弹长/m	0.64481		地面虚温/K	288.9
弹丸质量/kg	21.76		地面密度/(kg·m^-3)	1.206
极转动惯量/(kg·m²)	0.51123		纵向风扰/(m·s^-1)	0
赤道转动惯量(kg·m²)	0.04453		横向风扰/(m·s^-1)	0

模型参数		发射气象条件
参数	数值	参数	数值
弹径/m	0.122		地面压强/kPa	100
弹长/m	0.64481		地面虚温/K	288.9
弹丸质量/kg	21.76		地面密度/(kg·m^-3)	1.206
极转动惯量/(kg·m²)	0.51123		纵向风扰/(m·s^-1)	0
赤道转动惯量(kg·m²)	0.04453		横向风扰/(m·s^-1)	0

装药	初速度/ (m·s^-1)	特征点时刻/s	总时间/ s	弹道总时间与特征点时刻比值
全装药	710	24.65	49.33	2.0
1号装药	621	24.06	48.13	2.0
2号装药	516	21.09	42.15	1.99
3号装药	413	17.83	36.06	2.0
4号装药	312	14.76	29.66	2.0

装药	初速度/ (m·s^-1)	特征点时刻/s	总时间/ s	弹道总时间与特征点时刻比值
全装药	710	24.65	49.33	2.0
1号装药	621	24.06	48.13	2.0
2号装药	516	21.09	42.15	1.99
3号装药	413	17.83	36.06	2.0
4号装药	312	14.76	29.66	2.0

射角/(°)	特征点时刻/s	总时间/s	弹道总时间与特征点时刻比值
20	20.71	36.03	1.74
25	22.66	42.84	1.89
30	24.65	49.33	2.00
35	26.71	55.58	2.08
40	28.89	61.61	2.13
45	31.2	67.38	2.16
50	33.56	72.85	2.17
55	35.89	77.93	2.17
60	38.11	82.55	2.16
65	40.18	86.63	2.15