Firing Reliability Analysis Of Forehead Percussion Mechanism And Inertial Firing Mechanism Of The Projectile

Fuze plays a critical role in structures of the projectile,and its firing reliability directly affects the attacking effect of the projectile.And fuze firing mechanism contains forehead percussion mechanism and inertial firing mechanism.Although the projectile has high reliability during the design process in normal circumstances,the situations of fuze misfiring often occur in the process of shooting in experimental areas and battlefields,because of the poor working environment of the external flying of the projectile and bearing the complex load in the launching process.And once fuze misfiring occurs,it will cause failure to complete the detonation of the projectile and direct economic losses.Therefore,it is necessary to analyze the firing reliability of fuze’s forehead percussion mechanism and inertial firing mechanism when the projectile penetrates into the target plate.The main research work in this paper as follows:(1)Moving trail and formula of speed attenuation during the external flying of the projectile was deduced,and the simulation of projectile’s external motions was realized.By force analysis of fuze in the condition of projectile’s external flying,it is concluded that the impacts that affect the firing reliability of firing mechanisms had been identified.By solving the attenuation law of creep force,the influences of creep force on firing reliability of firing mechanism was eliminated.(2)By the way of joint parametric modeling of SolidWorks with ANSYS/LS-DYNA and ADAMS,the parameterization of dimensions of structure,motion pairs,positions of components and drives of motions were realized,and the parameterized model of fuze firing mechanisms were established.Based on MATLAB/Simulink,the dynamic simulation platform of inertial firing mechanism was built and the co-simulation of ADAMS and MATLAB was realized.(3)Based on parametric model in ANSYS/LS-DYNA,the virtual simulation experiment in penetration process was carried out for forehead percussion mechanism of the projectile,and the effects of the responses to forehead percussion mechanism under four parameters were quantitatively analyzed by single variable method;Based on simulation results of the speed of the projectile in ANSYS/LS-DYNA and parametric model in ADAMS,the virtual simulation experiment in penetration process was carried out for inertial firing mechanism of the projectile,and the effects of the responses to inertial firing mechanism under eight parameters were quantitatively analyzed by single variable method.(4)Based on the theory of Support Vector Machine(SVM),an active learning reliability method combining SVM and Monte Carlo simulation(ASVM-MCS)was proposed,and the effectiveness and accuracy of the classification performance by using ASVM-MCS were proved by the way of example verification in analyzing the structural reliability for discontinuous function.Finally,reliability analyses to forehead percussion mechanism and inertial firing mechanism of fuze were realized by the way of ASVM-MCS,and the reliabilities of firing mechanisms had been calculated.