压装连接对加速度计层间信号粘连的影响

邱云潇; 何丽灵; 陈刚; 吴昊; 李继承

doi:10.11858/gywlxb.20220517

压装连接对加速度计层间信号粘连的影响

doi: 10.11858/gywlxb.20220517

邱云潇^1,,
何丽灵^{1, 2,*, ,},
陈刚^{1, 2},
吴昊³,
李继承^{1, 2}

1.
中国工程物理研究院总体工程研究所, 四川绵阳　621999
2.
西南科技大学工程材料与结构冲击振动四川省重点实验室, 四川绵阳　621010
3.
同济大学土木工程学院, 上海　200092

基金项目: 中国工程物理研究院创新与发展基金（CX20210031）

详细信息

作者简介:
邱云潇（1992－），男，硕士研究生，主要从事冲击动力学研究. E-mail：625577030@qq.com

通讯作者:
何丽灵（1984－），女，博士，副研究员，主要从事冲击动力学研究. E-mail：heliling1984@139.com

中图分类号: O385
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- 文章访问数: 158
- HTML全文浏览量: 64
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出版历程
- 收稿日期: 2022-02-22
- 修回日期: 2022-03-02
- 录用日期: 2022-03-02
- 网络出版日期: 2022-07-21
- 刊出日期: 2022-07-28

Influence of Pressed Connection on Accelerometer Signal Adhesion between Target Layers

QIU Yunxiao^1
,,
HE Liling^{1, 2,*
, ,},
CHEN Gang^{1, 2},
WU Hao³,
LI Jicheng^{1, 2}

1.
Institute of System Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
3.
College of Civil Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 引信控制技术是战斗部研制的关键技术之一，层间加速度信号粘连可能导致计层引信错误决策。针对含压装连接加速度测量装置在弹体侵彻多层靶时信号粘连的问题，依托数值仿真获得了弹体结构动态响应。计算结果显示：无预紧压装时，装置与弹体的动态间隙最大可达25 μm，形成间隙碰撞，加剧层间信号粘连；适当预紧压装可抑制层间间隙，使压装连接与理想刚性连接近似。适当预紧压装时，层间加速度计过载频响呈现单峰特征，响应频率峰值与弹体一阶伸缩固有频率接近。存在最小预紧力，可使压装连接与理想刚性连接近似，其值随撞击速度、靶板层数增加而增大。这是因为在层间阶段弹体中留存的应力波的最大值随撞击速度、靶板层数增加而增大。研究结论为压装连接时加速度层间信号粘连的机理识别与控制奠定了基础，同时也可在一定程度上指导压装连接的工程装配。
- 压装连接 /
- 信号粘连 /
- 间隙碰撞 /
- 频域特性 /
- 预紧力
Abstract: Fuze control is one of the key technologies in developing warhead. The signal adhesion of deceleration may lead to wrong response of layer-counting fuze. Based on numerical simulation, the dynamic response of a projectile connected with an accelerometer equipment by pressed fitting is obtained during the projectile perforating multi-layer target. It is indicated that the maximum dynamic gap between the accelerometer equipment and the projectile can reach to 25 μm, which may induce gap collision and increase the signal adhesion of the accelerometer between target layers. The pressed fitting with a proper preload could suppress the gap collision, and then the pressed fitting connection between warhead and accelerometer could be approximated as the ideal rigid connection. With the proper preload, the frequency response of the overload signal obtained by the accelerometer shows a single peak, and the corresponding frequency of the peak is close to the eigen frequency of the stretching out and drawing back in the first order of the projectile. There is a critical minimum preload that makes the pressed fitting connection approximate to the ideal rigid connection. The minimum preload increases with the impact velocity and the target layers quantity. This may be due to the fact that a higher impact velocity and a larger target layers quantity enhance the maximum stress of wave generated in the projectile. This work provides a foundation for the mechanism identification and the control of the deceleration signal adhesion in interlayers. Moreover, it can give a guidance to projectile and accelerometer equipment assembly with pressed connection in engineering applications.
- pressed connection /
- signal adhesion of deceleration /
- gap collision /
- frequency characteristics /
- preload

HTML全文

图 1 含加速度测试装置的试验弹^[13]

Figure 1. Projectile containing accelerometer equipment^[13]

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图 2 数值仿真模型

Figure 2. Finite element model for numerical simulation

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图 3 弹体运动学参数试验结果与数值仿真结果对比

Figure 3. Comparison of kinematic parameters of projectile obtained by experimental measurement and numerical simulation

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图 4 装置在弹体内安装的示意图

Figure 4. Schematic diagram of pressed connection between projectile and accelerometer equipment

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图 5 不同预紧安装时装置与弹仓间隙（δ_AB，δ_CD ）的变化历程

Figure 5. Gaps of δ_AB and δ_CD versus the displacement of projectile with different preloads

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图 6 6种工况的整弹过载时域曲线

Figure 6. Time histories of deceleration of the whole projectile for 6 cases

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图 7 6种工况的加速度计及整弹的过载时域曲线

Figure 7. Time histories of deceleration of the accelerometer and whole projectile for 6 cases

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图 8 在理想刚性连接（工况1）与无预紧压装（工况2）时弹靶相互作用阶段加速度计过载频域曲线

Figure 8. Frequency response of deceleration of accelerometer for ideal rigid connection (Case 1) and pressed connection without preload (Case 2) during stage Ⅰ and stage Ⅲ

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图 9 理想刚性连接（工况1）与无预紧压装（工况2）时靶间及靶后飞行阶段加速度计过载的频域曲线

Figure 9. Frequency response of deceleration of accelerometer for ideal rigid connection (Case 1) and pressed connection without preload (Case 2) during stage Ⅱ and stage Ⅳ

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图 10 层间飞行时不同安装预紧下加速度计过载频域曲线

Figure 10. Frequency response of deceleration of accelerometer with different preloads between two slabs

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图 11 不同弹速下两种参考连接工况的加速度计过载时域曲线

Figure 11. Time histories of deceleration of accelerometer for two reference cases at different impact velocities

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图 12 预紧压装时不同速度下加速度计过载的时域曲线

Figure 12. Time histories of deceleration of accelerometer for pressed connection with different preloads at different impact velocities

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图 13 不同连接状态时不同着靶速度下加速度计层间过载信号的频域响应

Figure 13. Frequency response of deceleration of accelerometer between two slabs for different connection modes at different impact velocities

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图 14 以不同着靶速度穿越双层靶时弹体与装置典型位置的应力变化历程

Figure 14. Time histories of effctive stress for the elements in projectile and in accelerometer equipment during perforating two slabs at different initial impact velocities

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图 15 初速为600 m/s的弹体侵彻5层靶时加速度计和弹体刚体过载的时域曲线

Figure 15. Time histories of deceleration for accelerometer and projectile during perforating 5-layer target at an initial impact velocity of 600 m/s

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图 16 弹体初速为600 m/s时4种连接状态下层间加速度计过载频域响应

Figure 16. Frequency responses of the deceleration of accelerometer with 4 connection modes as a function of frequency during perforating two neighboring slabs at an initial impact velocity of 600 m/s

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图 17 弹体以600 m/s的初速穿过5层靶时弹体与装置典型位置的应力变化历程

Figure 17. Time histories of elements for projectile and accelerometer equipment during perforating five slabs at an initial impact velocity of 600 m/s

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表 1 弹体外壳、尾盖与测试装置外壳的材料参数^[14–15]

Table 1. Material parameters for shell and rear cover of projectile and shell of accelerometer equipment^[14–15]

Material	ρ/(kg·m⁻³)	G/GPa	ν	T_m/K	c_p/(J·kg⁻¹·K⁻¹)	A/MPa	B/MPa	n
TC4	4428	41.9	0.31	1 878	560	1098	1092	0.93
45CrNiMoV	7800	82	0.29	1 823	460	1410	1124	0.1954

Material	C	m	D₁	D₂	D₃	D₄	D₅
TC4	0.014	1.1	−0.09	0.27	0.48	0.014	3.87
45CrNiMoV	0.008786	0.5622

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表 2 灌封材料参数^[16]

Table 2. Material parameters for encapsulating compound^[16]

Material	ρ/(kg·m⁻³)	G/GPa	ν	σ_y/MPa	E_tan/MPa	${f{_{\rm{s} } }}$
Epoxy resin	1186	3.02	0.37	79.7	50	2.0

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表 3 靶板材料参数^[17]

Table 3. Material parameters for target^[17]

Material	ρ/(kg·m⁻³)	G/GPa	a	b	c	N	f_c/MPa	T/MPa	E_FMIN
Concrete	2300	13.67	0.79	1.6	0.007	0.61	41	3.6	0.01

S_max/MPa	p_crush/MPa	U_crush	p_lock/GPa	U_lock	D₁	D₂	K₁/GPa	K₂/GPa	K₃/GPa
7	13.67	0.0081	0.8	0.1	0.04	1	85	−171	208

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表 4 弹体以597 m/s正侵彻的数值仿真工况设计

Table 4. Different conditions of numerical simulations for normal impact at projectile velocity of 597 m/s

Case No.	State depiction	Preload force/kN	Gap/mm	Remarks
1	Ideal rigid connection		δ_AB≡δ_CD≡0	Reference case
2	No preload	0	δ_AB=δ_CD=0 before impact	Reference case
3	Preloaded	1.0	δ_AB=δ_CD=0 before impact
4	Preloaded	2.2	δ_AB=δ_CD=0 before impact
5	Preloaded	5.3	δ_AB=δ_CD=0 before impact
6	Preloaded	10.3	δ_AB=δ_CD=0 before impact

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表 5 理想刚性连接时弹体典型的固有频率及振型描述

Table 5. Eigen frequency and vibration modes of projectile with ideal rigid connection

Case No.	Eigen frequency/kHz	Vibration mode
1	16.192	Axial first-order stretching mode of projectile
2	21.065	Bulging mode of projectile shell
3	25.606	Coupled vibration mode of projectile and accelerometer equipment
4	31.209	Axial first-order stretching mode of accelerometer equipment
5	33.042	Bulging mode of accelerometer equipment

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