Multifunctional Fuze Penetration Process Simulation And Circuit Anti-impact Design

A multifunctional projectile fuze is treated as the research object in this thesis.Three-dimensional model of the projectile is established by Pro/E software.The numerical simulation of the projectile which has certain flight speed penetrating into the targets with different materials and layers is built by ANSYS/LS-DYNA.The overload course curves and the stress distribution of the whole projectile and the simplified fuze model in the penetration process are obtained as a basis for guiding the design and anti-shocking protection of the multifunctional fuze circuit.The hardware circuit of the multifunctional fuze is designed,which can receive data from the data-setter through the wired mode.According to the information content from the data-setter,fuze can achieve the function of timing air burst and the delay detonation function for hard target penetration.Fuze which isn't connected with the data-setter guides the projectile to achieve instantaneous impact function.A kind of counting coil embedded outside the fuze body is designed to measure the velocity of the projectile out of the muzzle,and to correct the velocity of the projectile at the muzzle according to the theoretical speed so as to achieve the goal of precise distance.If the projectile has no effect in the set time,fuze will realize the self-destructive function through the hardware circuit and ensure the safety and reliability of the operation.From the perspective of improving the circuit impact resistance,the structural features and the weak links of the typical components in the hardware circuit are analyzed,and the structural design of the circuit PCB board is carried out.The static model of the typical components and the dynamic model of the circuit after potting are established.The propagation of one-dimensional stress wave in the potting material is analyzed,and the attenuation equation of the stress wave in the viscoelastic materials is deduced by using the characteristic line method.Two common materials which are used in circuit potting are introduced.The damping properties of two materials are compared based on the attenuation equation.With hard polyurethane as the potting material,the potting process and the potting quality factors of the fuze circuit are introduced.The potted circuit has normal,high and low temperature tests.Then the circuit boards with different density have hammering tests.According to the fault reasons of the circuit after hammering tests the improvement measures are proposed and validated by hammering tests again.