A formula for lifting impulse of prefabricated components is presented on the basis of vibration theory.

In this paper,a kind of metal material is presented,it makes the cost of the flyer impact initiation detonation experiment much lower than before and provide the availability for people to study the impact initiation mechanism of explosive.

The fragment impact initiation of the charge covered with a thin plate was researched.

Based on an analysis of the shock initiation theory of explosives,the annular structure booster pellet and the annular conical structure booster pellet were designed.

In order to meet the requirement of insensitive ammunition,the concave-spherical booster pellet and hemispherical booster pellet are designed based on shock initiation theory,and the initiation capacity of the new booster pellet structure is compared with that of the regular cylinder booster pellet.

Based on the one-dimensional energy criterion of explosives shock initiation,considering the shock propagation of projectile impacting covered explosives,the relation formula of threshold velocity is obtained as Vw≈0.

Using the impact incipience,the engine overcomes the friction in the early stage of cold-start process,and it also reaches the desired ignition speed and reduces the duration time of the cold-start and optimizes the cold-start performance.