It is one of the important factors in fuse safety analysis whether tremendous change of the ballistic spring force occurs or not at high speed.

Improvement of the spring tube processing technology for jet-pipe servo valve;

Study on stiffness measurement of spring tube based on Hertzian contact theory;

The relationships of the longitudinal and transverse strains at different positions on a Cshape bourdon tube (CBT) surface and the applied pressure have been analyzed in detail; a novel bourdon tube, that is, straight bourdon tube (SBT), is then proposed and designed.