Abstract: Theoretical analyses and
experiments on acceleration measuring systems currently used in
this country for rolling bearings were carried out and the
following conclusions are arrived at:1. A consistent value of
resonance frequency between (3-4) kHz of the spring loaded piezo-electric
acceleration measuring system adopted in practice was obtained
from the results of theoretical calculation, testing of
sensoring system and frequency spectrum of rolling bearing
vibration tests. 2. It was proved by theoretical analyses and
experiments that the application of oil between the probe and
the bearing outer ring in a bearing vibration testing system
using piezo-electric accelerometer could reduce the resonance
amplitude of the system, but could not raise the resonance
frequency above 10 kHz. The resonance frequency still remained
between (3-4) kHz. 3. A resonance frequency around 12 kHz of the
moving-coil type velocity sensoring system for rolling bearing
vibration test was obtained. It is that the vibration frequency
of rolling bearing varies between 50 Hz to 10 kHz. A resonance
frequency of the moving-coil type velocity sensor around 12 kHz
enables the later to show the true behavior of bearing
vibration, whereas a resonance frequency between(3-4)kHz of the
probe type piezo-electric accelerometer sensoring system will
affect of trueness the measured natural frequency, making it
uncapable of reflecting the true behavior of bearing vibration.
Therefore, the velocity sensoring system is more suitable than
the acceleration sensoring system, and the moving-coil type
sensor, measuring the velocity, is recommended for rolling
bearing vibration test.
|