CN-117553635-B - Simulation and ground verification method for guided projectile thermal battery needling overload activation mechanism

CN117553635BCN 117553635 BCN117553635 BCN 117553635BCN-117553635-B

Abstract

The invention belongs to the technical field of guided projectile overload activation thermal batteries, and particularly relates to a simulation and ground verification method of a guided projectile thermal battery needling overload activation mechanism. The method comprises the first step of establishing a needling overload activation mechanism model, the second step of overload modeling simulation in the process of falling of the thermal battery, and the third step of determining verification indexes of a ground hammering verification test of a needling cap activation mechanism. The simulation and ground verification method of the guided projectile thermal battery needling overload activation mechanism can provide basis for the design of the activation mechanism, reduce repeated iteration trial and error process, and reduce the development period and development cost. Moreover, the impact energy of real flight can be accurately simulated through a ground hammering test, a reliable test standard is provided for thermal battery acceptance, the reliability of thermal battery activation is improved, and the risk of non-activation of the thermal battery in flight is greatly reduced.

Inventors

ZHANG YI
KANG BOYI
WANG QIAO
ZHANG PENGFEI
CHAI JIN
QI ZHUCHANG
HAN XUDONG
CHEN HONGXING
HU MIN
TAN LEI
Si Renhui

Assignees

西安现代控制技术研究所

Dates

Publication Date: 20260505
Application Date: 20231217

Claims (2)

1. A simulation and ground verification method for a guided projectile thermal battery needling overload activation mechanism, the method comprising: Firstly, establishing a needling overload activation mechanism model; step two, overload modeling simulation is carried out in the thermal battery falling process; Thirdly, determining verification indexes of a ground hammering verification test of a designed needling helmet activation mechanism; wherein, in the first step, it includes: step 11, inputting initial parameters of a needling activating mechanism, wherein the needling activating mechanism consists of a spring, a needling cap and a firing pin, the mass of the firing pin is m, the stiffness coefficient of the spring is k, the pre-pressing spring force is F0 when the initial position is x0, the firing pin speed is v0, the position when the firing pin impacts the needling cap is x1, the spring force is F1, and the firing pin speed is v1; step 12, calculating spring force of the spring at different positions x: ; step 13, inputting the emission overload a, calculating the inertial force of the firing pin ; Step 14, neglecting friction force, and obtaining a system dynamic equation according to Newton's second law in a system non-inertial system consisting of the firing pin and the spring: (1) step 15, calculating the position x and the speed v of the striking pin under the action of the emission overload, solving a differential equation of the formula (1) by a numerical method, wherein the initial condition is that when x=x0, v0=0 m/s, and the final condition is that x=x1, and obtaining the striking speed v1 and the kinetic energy at the moment; Step 16, judging whether the speed and the kinetic energy of the striking pin during striking meet the lower energy limit Ekmin required by the excitation of the needling cap; Wherein, in the second step, it includes: step 21, determining the falling height and the falling collision duration time, wherein the characteristics of an overload curve depend on the falling height H and the falling collision duration time t of the bullet in the falling collision process; step 22, calculating the speed v0 of the striking pin at the moment of falling collision, and according to a free falling body calculation formula, ; Step 23, calculating the speed v1 and the kinetic energy Ek1 when the firing pin impacts the firing cap, wherein in a system formed by the firing pin and the spring, when the friction force is ignored, the initial kinetic energy Ek0 of the firing pin during falling is partially converted into the elastic potential energy increment delta Ee1 of the spring when the firing pin impacts the firing cap, and the residual kinetic energy is the firing pin impact kinetic energy Ek1; Ek0=Ek1+△Ee1 step 24, determining whether the design result meets the maximum drop height index requirement according to the relation between the striking kinetic energy Ek1 of the striking pin and the lower limit Ekmin of the excitation energy of the needling cap; In the step 22, g is a gravitational acceleration; wherein, in the third step, the method includes: step 31, modeling an impact overload signal of a ground hammering test, wherein the impact signal is approximately half sine wave according to an actual measurement curve, an overload peak value is Gmax, a pulse width is T s , and the impact overload signal G of hammering is expressed as: Step 33, inputting an overload peak Gmax and an initial value of a pulse width T s according to the design parameters of the activation mechanism meeting the safety falling height index in the second step to obtain a hammering impact signal G as initial input of an activation mechanism simulation model, and performing simulation according to the model established in the first step to obtain the striking pin impact kinetic energy Ek1; The process is repeated until the impact kinetic energy Ek1 approaches to the lower limit Ekmin of the excitation energy of the needling cap, and the overload peak Gmax and the pulse width T s at the moment are verification indexes of the ground hammering verification test.
2. The method for simulating and verifying the needling overload activation mechanism of a guided projectile thermal battery according to claim 1, wherein in step 24, if the maximum drop height index requirement is not met, the design parameters of the firing pin weight and spring stiffness coefficient are modified, and the iteration is performed until the drop height requirement is met.

Description

Simulation and ground verification method for guided projectile thermal battery needling overload activation mechanism Technical Field The invention belongs to the technical field of guided projectile overload activation thermal batteries, and particularly relates to a simulation and ground verification method of a guided projectile thermal battery needling overload activation mechanism. Background The guided projectile adopts a mode of power-on after emission, and because the emission overload of the guided projectile is large (generally more than 2000 g), the thermal battery on the projectile is generally activated by adopting the emission overload as energy. The schematic diagram of the mechanism of the needling fire cap is shown in figure 1. The activation mechanism is often installed at thermal battery cylinder terminal surface, and when the shot was launched, whole activation mechanism accelerated forward movement under the overload effect of launching, and the firing pin compresses the spring under inertial force effect, and the firing pin pierces the acupuncture fire cap with certain speed, and the acupuncture fire cap fires, and the flame fires the ignition subassembly through the fire hole to activate thermal battery. The design of the activation mechanism needs to consider two main use scenarios, namely, the activation mechanism needs to be reliably activated during the launching process and the activation mechanism cannot be activated during the daily service processing process. Because the engineering practice is based on experimental and experience fumbling rules for a long time and lacks modeling simulation and verification index basis of the activation process, the situation of non-activation or false activation during ground service treatment often occurs in the flight test. It is imperative that simulation calculations be theoretically performed on the activation process of the activation mechanism to guide the design. Disclosure of Invention First, the technical problem to be solved The invention aims to solve the technical problem of how to design and verify a guide needling overload activation mechanism, and provides a simulation and verification method for improving activation reliability and safety of guided shells. (II) technical scheme In order to solve the technical problems, the invention provides a simulation and ground verification method of a guided projectile thermal battery needling overload activation mechanism, which comprises the following steps: Firstly, establishing a needling overload activation mechanism model; step two, overload modeling simulation is carried out in the thermal battery falling process; and thirdly, determining the verification index of the ground hammering verification test of the designed needling fire cap activation mechanism. Wherein, in the first step, it includes: step 11, inputting initial parameters of a needling activating mechanism, wherein the needling activating mechanism consists of a spring, a needling cap and a firing pin, the mass of the firing pin is m, the stiffness coefficient of the spring is k, the pre-pressing spring force is F0 when the initial position is x0, the firing pin speed is v0, the position when the firing pin impacts the needling cap is x1, the spring force is F1, and the firing pin speed is v1; Step 12, calculating spring force of the spring at different positions x, wherein F k＝F0 +kx is the spring force; step 13, inputting an emission overload a, and calculating an inertia force F g = -ma of the firing pin; step 14, neglecting friction force, and obtaining a system dynamic equation according to Newton's second law in a system non-inertial system consisting of the firing pin and the spring: Step 15, calculating the position x and the speed v of the striking pin under the action of the emission overload, solving a differential equation of the formula (1) through a numerical method, wherein the initial condition is that when x=x0, v0=0 m/s, the final condition is that when x=x1, and obtaining the striking speed v1 and the kinetic energy at the moment. And 16, judging whether the speed and the kinetic energy of the striking pin during striking meet the lower energy limit Ekmin required by the excitation of the needling cap. Wherein, in the second step, it includes: Step 21, determining the falling height and the falling collision duration time, wherein the characteristics of an overload curve depend on the falling height H and the falling collision duration time T of the bullet in the falling collision process; step 22, calculating the speed v0 of the striking pin at the moment of falling collision, and according to a free falling body calculation formula, Step 23, calculating the speed v1 and the kinetic energy Ek1 when the firing pin impacts the firing cap, wherein in a system formed by the firing pin and the spring, when the friction force is ignored, the initial kinetic energy Ek0 of the firing pin during falling is