circular pitch error meaning in English

周节误差

The establishment of gear fault data warehouse the paper studies several gear cases in drive lab of wuhan university of science and technology . the signal of normal gear pair , the one has been worn seriously , the one which has circular pitch error and the one whose pinion has a ruptured tooth is acquired independently . after fft transformation , the amplitude values of 0 - 0 . 4 multiple engage frequency , 0 . 4 - 0 . 5 multiple engage frequency , 0 . 5 - 1 multiple engage frequency , 1 multiple engage frequency , 2 multiple engage frequency , 3 multiple engage frequency , 4 multiple engage frequency and greater then 4 multiple engage frequency of every signal are obtained respectively
论文主要完成下列内容: 1 .齿轮故障数据仓库的建立以武汉科技大学传动实验室的若干台齿轮箱为研究对象,分别采集正常齿轮副、磨损严重的齿轮副、有周节误差的齿轮副和小齿轮有一个断齿的齿轮副的振动加速度信号,经过fft变换,分别得到每个信号的0 ~ 0 . 4倍啮合频率、 0 . 4 ~ 0 . 5倍啮合频率、 0 . 5 ~ 1倍啮合频率、 1倍啮合频率、 2倍啮合频率、 3倍啮合频率、 4倍啮合频率和大于4倍啮合频率幅值。