Through the gear vibration signal of all wear process analyzed,it is proved that non?dimensional statistical parameter,standard deviation parameter and cepstrum are effective used in gear worn fault diagnosis.
通过对齿轮从跑合到磨损报废全过程的振动信号分析 ,证明时域无量纲因子、标准差及倒频谱对齿轮磨损故障诊断很有效 。
International Society for Rock Mechanics(ISRM)proposed in 1995 a new type of rock fracture toughness specimen—cracked chevron notched Brazilian disc(CCNBD),however,the calibration of the dimensionless stress intensity factor,which is an important mechanical parameter for fracture toughness calculation,is still in question.
国际岩石力学学会(ISRM)在1995年提出了一种新型岩石断裂韧度试样——人字形切槽巴西圆盘试样CCNBD,但是,其断裂韧度计算公式中的重要参数(即无量纲应力强度因子的标定)仍存在问题。