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WELCOME. BASICS OF VIBRATION. VIBRATION. CHARACTERISTICS OF VIBRATION SIGNAL AMPLITUDE FREQUENCY PHASE ORBIT. TYPES OF VIBRATION PICK UP. PROXIMITY PROBE VELOCITY PICK UP ACCELEROMETER. CRITERIA FOR SELECTION OF VARIOUS TYPES OF VIBRATION PICK UP. PROXIMITY PROBE

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Presentation Transcript
slide3

VIBRATION

CHARACTERISTICS OF VIBRATION SIGNAL

  • AMPLITUDE
  • FREQUENCY
  • PHASE
  • ORBIT
slide4

TYPES OF VIBRATION PICK UP

  • PROXIMITY PROBE
  • VELOCITY PICK UP
  • ACCELEROMETER
slide5

CRITERIA FOR SELECTION OF VARIOUS TYPES OF VIBRATION PICK UP

PROXIMITY PROBE

  • SHAFT VIBRATION MEASUREMENT
  • KEY PHASER MARKER
  • SHAFT CENTRE LINE POSITION
  • BEST SUITED FOR 1 TO 500 HZ

VELOCITY PICK UP

  • FOR BEARING AND STRUCTURAL VIBRATION
  • BEST SUITED FOR 10 TO 1000 HZ
slide6

CRITERIA FOR SELECTION OF VARIOUS TYPES OF VIBRATION PICK UP

ACCELEROMETER

  • FOR HIGH FREQUENCY RANGE
  • BEST SUITED FOR 1000 HZ ONWARDS
slide7

UNITS OF VIBRATION

(A) DISPLACEMENT

  • MICRONS, PEAK TO PEAK
  • MICRONS, 0 TO PEAK
  • MICRONS, RMS

(B) VELOCITY

  • MM/SEC, 0 TO PEAK
  • MM/SEC, RMS

(C)ACCELERATION

  • M/SEC2, PEAK
  • M/SEC2, RMS
  • G, PEAK
  • G, RMS
slide8

UNITS OF VIBRATION

RMS

0 - Peak

Average

Peak - Peak

RMS = 0.707 x (0-Peak)

Average = 0.637 x (0-Peak)

Peak to Peak = 2 x (0-Peak)

slide9

SHAFT ORBIT

Y

X

Proximity

Probes

slide10

INSTRUMENTS FOR VIBRATION MEASUREMENT

  • VIBROMETER
  • VIBRATION ANALYSER
  • FFT ANALYSER
slide11

TIPS FOR MAKING VIBRATION DATA MORE USEFUL FOR ANALYSIS

  • LOCATION OF VIBRATION PICK UPS TO BE INDICATED
  • LOCATION OF PHOTOCELL TO BE INDICATED
  • DIRECTION OF ROTATION SHOULD BE INDICATED
  • KEY PHASER MARK ON ROTOR POSITION TO BE INDICATED
  • AXIAL VIBRATION PHASE LOGGING MUST HAVE DIRECTION INDICATION
  • NAME OF VIBRATION ANLAYSER SHOULD BE INDICATED
  • VIBRATION UNITS TO BE INDICATED
slide12

TIPS FOR MAKING VIBRATION DATA MORE USEFUL FOR ANALYSIS

  • WHILE GIVING CONTROL ROOM VALUES, SPECIFY THE VIBRATION UNITS AND LOCATION OF THE PICKUPS
  • VIBRATION MUST BE MEASURED BY PORTABLE VIBRATION METER NEAR CONTROL ROOM PICKUP FOR VARYING THE CORRECTNESS OF CONTROL ROOM MEASUREMENT
  • PICK UP SHOULD NOT BE MOUNTED LOOSE
  • BRACKET FOR EXTERNAL SHAFT VIBRATION PICKUP SHOULD BE STIFF ENOUGH NOT TO PRODUCE AMPLIFICATION / RESONANCE
slide13

TIPS FOR MAKING VIBRATION DATA MORE USEFUL FOR ANALYSIS

  • FOR CORRECT TRENDING OF VIBRATION READINGS, SAME LOCATION SHOULD BE USED FOR ALL PERIODIC MEASUREMENTS
slide14

REASONS OF VIBRATION

IF THE MEASUREMENT IS HEALTHY, FOLLOWING MAY BE THE REASONS OF VIBRATION PROBLEM

  • UNBALANCE
  • MISALIGNMENT
  • LOOSENESS
  • PIPE PULLS
  • SHAFT CATENARY / BEARING LOADING
  • RESONANCE
  • UNEQUAL FLOW PATH CLEARANCES
  • RUBBING
slide15

REASONS OF VIBRATION

  • SHAFT BOW
  • OIL / STEAM WHIRL
  • DEVIATED OPERATING PARAMETERS
  • DEFECTIVE BEARING / ASSEMBLY OF BEARING
  • VIBRATION TRANSMITTION FROM OTHER SOURCE
  • GEAR INACCURACIES
  • CASING DISTORSTION
  • CAVITATION
slide16

STEPS FOR RESOLVING THE VIBRATION PROBLEM

  • ACCURATE MEASUREMENT OF VIBRATION DATA
  • COLLECTION OF OPERATING PARAMETERS
  • STUDY OF HISTORY OF VIBRATION BEHAVIOUR / OVERHAULING REPORTS / RECURRING PROBLEM FACED
  • INTERACTION WITH O&M PERSONNELS
  • COLLECTION OF DETAILED VIBRATION BEHAVIOUR AT VARIOUS CONDITIONS OF OPERATION LIKE NO LOAD RUN, RUN UP, RUN DOWN, WITH AND WITHOUT EXCITATION, PART AND FULL LOAD OPERATION ETC.
  • VIBRATION ANALYSIS TO NARROW DOWN THE REASONS OF HIGH VIBRATION
slide17

STEPS FOR RESOLVING THE VIBRATION PROBLEM

  • FORMULATION OF ACTION PLAN (SHORT TERM / LONG TERM)
  • IMPLEMENTATION OF ACTION PLAN
  • RESPONSE OF MACHINE AFTER IMPLEMENTATION OF ACTION PLAN
  • FRESH VIBRATION ANALYSIS, IF THE PROBLEM PERSISTS
  • IMPLEMENTATION OF NEW ACTION PLAN

THE CYCLE OF VIBRATION ANALYSIS AND IMPLEMENTATION OF ACTION PLAN CONTINUES TILL THE VIBRATION PROBLEM IS SATISFACTORILY RESOLVED

slide18

KNOW YOUR MACHINES

  • KNOWLEDGE OF BEHAVIOUR FOR SIMILAR TYPE OF MACHINES
  • VIBRATION PRONE AREAS
  • INFLUENCE OF PARTICULAR OPERATING PARAMETER
slide19

INTERNATIONAL STANDARDS ON VIBRATION

  • ISO 10816 BEARING VIBRATION
  • ISO 7919 SHAFT VIBRATION

THERE ARE THREE LIMITS IN INTERNATIONAL STANDARDS

  • LIMITS FOR NEW MACHINES
  • ALARM LIMITS
  • TRIP LIMITS
slide21

RECOMMENDED LOCATIONS OF SHAFT VIBRATION MEASUREMENTS AS PER ISO

Measuring Amplifier

Measuring Amplifier

PROXIMITY PICK-UP

45O

45O

VERTICAL

L

R

R

OR

L

SHAFT

SHAFT

HORIZONTAL