Rotor equipment rotor imbalance vibration fault diagnosis

Rotor imbalance

Vibration characteristics of rotor mass eccentricity

1

2

3

4

5

6

7

8

Characteristic frequency

Frequent frequency

Vibration stability

Vibration direction

Phase characteristics

Axis trajectory

Precession direction

Vector area

1×

stable

Radial

stable

oval

Positive precession

constant

constant

Variation of eccentric vibration of rotor mass with sensitive parameters

1

2

3

4

5

6

With speed

With load

With oil temperature

With traffic

With pressure

Other identification methods

obvious

Not obvious

constant

constant

constant

Vibration tends to zero at low speeds

Cause of malfunction of rotor mass eccentricity

Source of failure

1

2

3

4

Design, manufacture

Installation, repair

Operation, operation

Machine degradation

main reason

Unreasonable structure, large manufacturing error, uneven material, low dynamic balance

Displacement of parts on the rotor

Rotor fouling

Loose parts on the rotor

Vibration characteristics of rotor component defects

1

2

3

4

5

6

7

8

Characteristic frequency

Frequent frequency

Vibration stability

Vibration direction

Phase characteristics

Axis trajectory

Precession direction

Vector area

1×

Stable after the sudden

Radial

Stable after mutation

oval

Positive precession

Stable after mutation

Rotor component defect vibration changes with sensitive parameters

1

2

3

4

5

6

With speed

With load

With oil temperature

With traffic

With pressure

Other identification methods

obvious

Not obvious

constant

constant

constant

Sudden increase in amplitude

Cause of failure of rotor component defect

Source of failure

1

2

3

4

Design, manufacture

Installation, repair

Operation, operation

Machine degradation

main reason

Unreasonable structure, large manufacturing error, uneven material

The rotor has a large preload

1. Overspeed, overload operation 2. Partial damage to parts

Rotor corrosion fatigue, stress concentration