Solution was proposed in which PVDF piezoelectric film was used to detect the percussionforce of powder grains to projectile base in launching environment, and the feasibility was discussed.
提出了利用PVDF压电薄膜测量火炮发射过程中火药颗粒对弹底撞击应力方案，论述了该方案的可行性。
2
The DTH percussion-compact drilling is a high efficiency technology drilling in soil strata, which use the impact force produced by hammer piston to crush and compact soil.