Whether the precursor is obvious is correlated to rock the character, and the precursor of AE rate is more apparent than the precursor of AE energyrate comparatively.
The upsetting test of metal powder sintered preform by blow speed of the hydraulic press, crank press, pneumatic hammer and high energyrate forging hammer was reported.
研究了用液压机、曲柄压力机、空气锤及高速锤的打击速度对粉末冶金烧结体进行的镦粗试验。
3
Dynamic signals measured from experiment beams are first decomposed into wavelet packet components, then wavelet energyrate index is computed and used to detect location of damage.