Detonation Strategy Of Muti-Layers Penetration Fuse For Building Destruction

The main purpose of the hard target penetration ammunition in modern war is to destroy hard targets on ground with high value, such as the buildings, bridges, airfield runway, underground hangar and command center, while the penetration fuze which the ammunition is equipped with is the core unit for efficient damage. Penetration fuze is a control system using the target information detected in the penetrating process to detonate the penetration warhead with predetermined tactics, which consists of arming control system, safety system, energy system and explosive train. With the information getting by its target detection unit (accelerometer mostly used now), penetration fuze can achieve its target identification, the self-adaption control of burst-point and then the optimum damage of penetration ammunition.In this paper, we mainly discuss around the equipment demand of increasing speed of the high-speed penetration ammunition, then with the study on the current penetration fuze’s deficiency of detection ability at multi-layers and difficulty of ensuring the layer-counting precision, we build the numerical simulation model of the high-speed penetration fuze’s penetrating multi-layers, make simulation calculation and acquire the overload signal of multi-layers target’s envelope conglutination which is in accordance with the actual measured signal. Based on the above discussion, we come to the summary of the detonation mode, working mode and the related operating principle of the current penetration ammunition fuze. The detonation mode of the current penetration fuze mainly consists of time-counting mode, layer-counting mode, void sense mode and self-destroy mode, which can work independently or coordinate with each other as a complex one, like the time-counting/layer-counting mode, even the time-counting/ layer-counting/void sense detection/self-destroy multi-function mode, which could offer strong support to the identification of the target status for the warhead of the penetration fuze to control the warhead detonation and achieve the efficient damage for various kinds of targets. The specific working mode mainly depends on the kind of the target. For example, the time-counting mode or the medium sense mode works best for the single layer thick target like the airfield runway, while the void sense/time-counting mode may suit for the solid defence target like bridges, and the layer-counting mode is usually chosen for the multi-layer construction.Based on the above discussion, we study on the lowpass filtering, integral noise reduction and wavelet transform methods to reduce the high frequency oscillation signal on the overload signal and pick up the envelope signal of the target layer to improve the fuze detection ability for the layer envelope and the precision of the layer-counting detonation, mainly focusing on the large amount of oscillation signal overlying on penetration overload of the high-speed penetration fuze and the overload envelope conglutination problem.We then build up the layer-counting detonation algorithm based on the specific signal processing method, and do the simulation setting the real overload conglutination signal as input signal using MATLAB. The result meets our expectation and verify the effectiveness of the algorithm in this paper.Then we move forward to realize the algorithm of envelope detection and layer-counting control in hardware, and do the semi-physical simulation using the real overload conglutination signal. The result proves the correctness of the algorithm in this paper and strongly support the solution of the layer conglutination and decreasing accuracy of layer-counting problems during the development of the high-speed penetration fuze.