What causes a very unusual motor vibration issue?
The extremely low levels (0.04 ips-pk) of vibration at 7200 cpm generated by the motor were exciting the system natural frequency and causing the large vibration responses. Next, the operating deflection shape was measured on two motor installations. Vertical motions on the motor, base plate and foundation were very low.
How big is the 2x line frequency vibration?
All of the motors had excessive 2X line frequency (7200 cpm) vibration amplitudes ranging from 0.2 ips-pk to 0.6 ips-pk. For each of the 24 motors, when one or more of the motor feet were released, the 2X vibration dropped to 0.08 ips-pk or below.
What is the vibration level of a motor?
All of the motors had excessive 2X line frequency (7200 cpm) vibration amplitudes ranging from 0.2 ips-pk to 0.6 ips-pk. For each of the 24 motors, when one or more of the motor feet were released, the 2X vibration dropped to 0.08 ips-pk or below. When re-tightened, the vibration immediately returned. All soft foot readings were below 0.002 in.
Is it normal for a car to have vibration?
It’s a common rule that cars should run smoothly on a flat road, at any speed. However, if you’ve owned a car long enough, chances are great that your vehicle has developed some vibration issues.
The extremely low levels (0.04 ips-pk) of vibration at 7200 cpm generated by the motor were exciting the system natural frequency and causing the large vibration responses. Next, the operating deflection shape was measured on two motor installations. Vertical motions on the motor, base plate and foundation were very low.
When to use cause and effect in vibration diagnostics?
Once detected, a cause and effect approach must be used to take further steps toward analyzing what caused the detected problem. Only then will you keep the problem from becoming a repeat problem. Vibration is the behavior of a machine’s mechanical components as they react to internal or external forces.
All of the motors had excessive 2X line frequency (7200 cpm) vibration amplitudes ranging from 0.2 ips-pk to 0.6 ips-pk. For each of the 24 motors, when one or more of the motor feet were released, the 2X vibration dropped to 0.08 ips-pk or below.
What should be included in vibration diagnostic guide 3?
Vibration Diagnostic Guide 3 NOTE: As discussed in future sections, for comparison purposes, measurement types and locations must also be identical. MEASUREMENTSENSORPOSITION Select the best measurement point on the machine. Avoid painted surfaces, unloaded bearing zones, housing splits, and structural gaps.