一电机振动频谱，帮忙解读下，为什么在FFT 400处有个高峰？

lkg

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 bearing  frequencies)	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 bearing  frequencies)	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	9.613636363636363  Hz
fr   Rotational frequency of a rolling element about its own axis	51.2474946313529  Hz
fip   Over-rolling frequency of one point on the inner ring	123.0909090909091  Hz
fep   Over-rolling frequency of one point on the outer ring	76.9090909090909  Hz
frp   Over-rolling frequency of one point on a rolling element	102.4949892627058  Hz

lkg

为什么FFT最大量程在500？

william

横轴是时间？？？？

廊桥遗梦

应该与电机的结构有关。主要对应于电极数及其倍数

dee86

这个图是在是太模糊了