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Choice of (A) monitoring vibration energy transferred to the other parts or systems of elastic foundation, the most easy to reflect the equipment running status change for including the quality of rotary equipment, suggested that the measuring point selected in the bearing or the shell of the machine installation, also can choose other measuring point, but to be able to reflect the running status of equipment in the bearing measurements, general advice to measure three directions of the vertical direction vibration mark V, horizontal direction labeling for H, axis direction marked as A, as shown in figure 1
A schematic diagram of the location of the vibration sensor when the vibration is measured on the machine housing
Set vibration monitoring cycle is too long, easy to capture devices start degradation information, the cycle is set too short, and increased workload and cost monitoring should be according to the structure characteristics of the device speed power transmission way and the failure mode, reasonable vibration monitoring selected cycle when the device is in a stable operation period, the monitoring cycle can be longer;
When equipment defects and problems, should shorten the monitoring period when determining equipment monitoring period, should observe the following principles: 1. The installation of equipment or mass after repair of equipment operation in the early period is shorter (e.g., monitoring every hour), after waiting for the device has reached the stable operation period, the monitoring period may be extended appropriately 2. Test cycle should be fixed 3. As far as possible to the tally stand full-time monitoring equipment, most of the equipment monitoring cycle can generally be classified as 7 to 14 days;
Of close to or higher than 3000 RPM high speed rotating equipment, one should be monitored at least once a week 4. The workshop equipment monitoring, monitoring cycle can generally be classified as 1 times a day or once per class 5. The measured vibration value is close to or more than the standard equipment alarm, to shorten the monitoring period if the measured vibration value close to or more than the equipment downtime, shall promptly arrange maintenance downtime if cannot stop for production reasons, to strengthen the monitoring, the monitoring cycle can be shortened to 1 day or less
For ultra-low frequency vibration, it is suggested to measure vibration displacement and velocity.
For low frequency vibration, it is suggested to measure vibration velocity and acceleration.
For medium-high frequency vibration and high-frequency vibration, it is suggested to measure the vibration acceleration as follows: (1) According to the frequency classification of vibration of equipment, according to the frequency of vibration, the vibration of equipment can be divided into the following categories: ultra-low frequency vibration, the vibration frequency is below 10Hz;
Low frequency vibration, vibration frequency between 10Hz and 1000Hz;
Medium and high frequency vibration, with vibration frequency ranging from 1000Hz to 10000Hz;
High frequency vibration, vibration frequency above 10000Hz (2) displacement is the peak;
The velocity is the effective value;
The acceleration is the effective value;
Sometimes peak values of velocity and acceleration are measured as needed
In order to ensure the comparability of measurement results, we should pay attention to the following aspects in vibration monitoring: the measuring instrument is the same;
The measuring instruments shall be arranged in the same manner;
The position direction of the measuring point is the same;
The operating condition of the equipment is the same;
The background vibrations are measured by the same person as far as possible
Equipment vibration data should be monitored and collected on a regular basis strictly according to the monitoring path and monitoring cycle. Other process parameters of the equipment, such as temperature, pressure and flow rate, should also be recorded, so as to facilitate comparison and trend management. Equipment monitoring personnel should make timely arrangement and backup of test records.
Timely approval of data records in doubt;
Timely analysis and processing of measurement data;
Make trend prediction and easy diagnosis