Influence of Distributed Capacitance on Information Transmission Characteristics of Collinear Setting System of Fuze and Its Optimization

doi:10.12382/bgxb.2022.0406

Abstract

Abstract:

An equivalent circuit model based on the setter module, the energy and information transmission module and the fuze circuit module is established for the effect of distributed capacitance on the setting reliability in the process of fuze collinear setting. The influences of distributed capacitance on the information transmission characteristics of collinear setting systemwhen the setting output signal is at high level and low level are studied, respectively. The conclusion is drawn that the distributed capacitance has little influence on the collinear installation system at high level, and the relationship between the low-level pulse width of the received signal recognized by the fuze and the distributed capacitance at low level is deduced. Finally, two optimization methods are proposed, one uses a diode to shield the external factors, such as the capacitance introduced by the incorporated cable, and the other uses a parallel-connected resistor with a smaller resistance to reduce the time constant of the system, thereby improving the recognition rate of the fuze. The low-level pulse width improves the reliability of fuze setting. The simulation and experimental verification show that both methods improve the reliability of the fuze to identify the received signal.

Key words: fuze, setting system, distributed capacitance, reliability

CLC Number:

TJ430

LI Hao, LI Haojie, YUAN Hongwei, YUE Zhonghao, MA Haitao. Influence of Distributed Capacitance on Information Transmission Characteristics of Collinear Setting System of Fuze and Its Optimization[J]. Acta Armamentarii, 2024, 45(1): 319-327.

Figures/Tables 19

Fig.1 Schematic diagram of collinear setting system

Fig.2 Equivalent circuit model of collinear setting system

Fig.3 Low level duration for fuze decoding

Fig.4 Set output voltage Vi waveform

Table 1 Setting of simulation values

参数	数值
装定输出电阻R₁/Ω	20
装定输出模块接地电阻R₆/kΩ	100
电缆等效电阻R₂、R₃/Ω	3.8
传输电缆等效的分布电容与击发电缆引入的电容C₁/nF	9.28
接收装定信号的接收电阻R₄/kΩ	6.3
储能电容C₂/μF	200
储能电容的等效负载R₅/kΩ	10

Fig.5 Simulation model of collinear setting system

Fig.6 Influence of distributed capacitance on waveform distortion

Fig.7 Transmission signal distortion

Fig.8 Setting model when set output signal Vi is high

Fig.9 Setting model when set output signal Vi is low

Fig.10 Influence of different distributed capacitances on waveform distortion

Fig.11 Schematic diagram of collinear setting systemafter using diode to isolate some capacitors

Fig.12 Simulation model of collinear setting system with diode

Fig.13 Transmission signal waveform after shielding the distributed capacitance by diode

Fig.14 Experimental waveforms before and after optimization using diodes

Fig.15 Schematic diagram of the system after paralleling resistors

Fig.16 Simulation model of collinear setting system with parallel resistors

Fig.17 Distortion degree of waveform after parallel connection of different resistors

Fig.18 Experimental waveforms before and after paralleling 1kΩ resistors

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