lkg 发表于 2017-11-14 06:06

一电机振动频谱，帮忙解读下，为什么在FFT 400处有个高峰？

Bearing frequencies : NU 2217 ECM 窗体底端
Input parameters
ni
Rotational speed of the inner ring 1500 r/min
ne
Rotational speed of the outer ring (only used    to calculate the bearingfrequencies) 0 r/min
Result
fi
Rotational frequency of the inner ring 25.0 Hz
fe
Rotational frequency of the outer ring 0.0 Hz
fc 滚动元件和保持架组件的旋转频率Rotational frequency of the    rolling element and cage assembly 10.601265822784809 Hz
fr 滚动元件绕轴旋转的频率
Rotational frequency of a rolling element about its own axis 80.39293248945147 Hz
fip 过滚动内圈上的一个点的频率
Over-rolling frequency of one point on the inner ring 244.77848101265823 Hz
fep 过滚动外圈上的一个点的频率
Over-rolling frequency of one point on the outer ring 180.22151898734177 Hz
frp 过滚动的滚动元件上的一个点的频率
Over-rolling frequency of one point on a rolling element 160.78586497890294 Hz
B Bearingfrequencies : 6314frInput parameters
ni
Rotational speed of the inner ring 1500 r/min
ne
Rotational speed of the outer ring (only used to calculate the bearingfrequencies) 0 r/min
Result
fi
Rotational frequency of the inner ring 25.0 Hz
fe
Rotational frequency of the outer ring 0.0 Hz
fc
Rotational frequency of the rolling element and cage assembly 9.613636363636363Hz
fr
Rotational frequency of a rolling element about its own axis 51.2474946313529Hz
fip
Over-rolling frequency of one point on the inner ring 123.0909090909091Hz
fep
Over-rolling frequency of one point on the outer ring 76.9090909090909Hz
frp
Over-rolling frequency of one point on a rolling element 102.4949892627058Hz

lkg 发表于 2017-11-14 06:07

为什么FFT最大量程在500？

william 发表于 2017-11-14 12:13

横轴是时间？？？？

廊桥遗梦 发表于 2017-11-23 11:17

应该与电机的结构有关。主要对应于电极数及其倍数

dee86 发表于 2017-11-28 04:16

这个图是在是太模糊了
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