超高加速度抛射体内电子芯片的两维欧拉—拉格朗日模拟（英文）

Two-dimensional Eulerian-Lagrangian Modeling of Shocks on an Electronic Package Embedded in a Projectile with Ultra-high Acceleration

文章建立两维欧拉—拉格朗日模型以研究抛射体发射过程对其内部电子芯片的冲击及其机理。该模型计入了火药燃烧的两相流动、抛射体结构运动及流固相互作用,其中火药的固体相和气体相分别采用了线性和指数状态方程描述。通过数值结果分析了以位移、弹口速度、加速度表征的抛射体过程中的冲击响应,并讨论了火药比能对抛射体的加速度冲击及对其内部电子芯片的冲击的影响规律。该模拟方法也可供船用智能火炮系统抗冲击分析及船上电子设备生存能力设计时参考。

A two-dimensional axisymmetric Eulerian-Lagrangian finite element model is developed to investigate the shocks on an electronic package and its underlying mechanism during projectile launch, which incorporates the two-phase flows due to propellant combustion, motions of the struc- tures, and solid-fluid interactions at their interfaces. The unreaeted solid phase and reacted gas phase of the propellant are described by linear and exponential equations of state, respectively. Through nu- merical simulations, the characteristics of the shocks during projectile launch in terms of projectile displacement, muzzle velocity, and acceleration is analyzed. The effect of the internal energy of the propellant on the evolution of shocks is investigated. The transmitted shocks to the payload during projectile launch process are also examined. This modeling technique can be adopted for the predic- tion of shocks analysis and novel design of naval weapon systems, especially for the survivability de- sign of onboard electronics of ships and submarines.