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Research on the key problems of interference bullet processes a sound

Author: LiuYu
Tutor: WangYuShi
School: Nanjing University of Technology and Engineering
Course: Mechanical and Electronic Engineering
Keywords: acoustic interference device numerical simulation water-entry impact terminal velocity underwater explosion sympathetic detonation
CLC: TJ413.3
Type: Master's thesis
Year: 2014
Downloads: 4
Quote: 0
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Abstract


A certain acoustic interference device, which takes the form of cluster bombs, is soft kill anti-torpedo weaponry which uses reverberation effect of underwater continual explosion. The interference submunition is a significant component of the acoustic interference device and its function would directly affect the effectiveness of underwater acoustic interference device.In order to provide a reference for the optimization of submunition and its fuze, the key problems of submunition in trajectory were studied by theoretical analysis, simulation and test method.In order to analysis the water-entry impact overload of submubitions, the water-entry velocity was studied. The drag coefficient of submunition in air was calculated by numerical simulation, and then the water-entry velocity range and expected velocity were achieved by taking advantage of the Matlab software after submunitions were throwed with different height. All of them have been tested by experiment.The theory expected value of water-entry velocity is between29.96m/s-33.74m/s when the height of throwing submunitions is between90m-350m.In order to provide a reference for the design, the water-entry processes of submunitions with different velocities and postures were simulated by using the ANSYS/LS-DYNA software. When the water-entry velocity is same, submunitions with vertical posture would bear the supreme impact overload;when the water-entry posture is same, the peak acceleration would become greater along with the increasing of velocity,and the relationship between the water-entry velocity and the peak acceleration is linear;When the water-entry velocity is same, the expense of kinetic energy of submunitions with horizontal posture is the most in initial period. When the water-entry posture is same, the percentage which the expense of kinetic energy takes in the initial kinetic energy would become larger along with the increasing of velocity in initial period.The depth of submunition’s explosion is related to the terminal velocity and produces an effect on the effectiveness of acoustic interference device. After analyzing the kinetic characteristic of submunition in water, it shows that the terminal velocity range is between0.42m/s and1.26m/s, and the expected value of terminal velocity is0.69m/s.In order to provide a reference for the reliable operation of acoustic interference device, underwater explosion and sympathetic detonation of submunitions were researched. The process of underwater explosion was simulated by software ANSYS/LS-DYNA.The peak of shock wave’s overpressure of submunition’s underwater explosion in different distances was obtained by theoretical analysis and numerical simulation. From the perspective of the impact of shock wave’s overpressure on adjacent submunitions, sympathetic detonation was analyzed by theoretical and tested in some certain distances. The results showed that the submunition whose distance is no less than0.3m to the explosion center would not effect the reliable operation of acoustic interference device by the reason of priming system’s explosion and sympathetic detonation.

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CLC: > Industrial Technology > Arms industry > Ammunition, fuses, pyrotechnics > Ammunition > Shells : the use and construction of > Cluster bombs
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