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BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 115-07-08 ©SKF
15-07-08 ©SKF
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2
Vibration Analysis
Conducted by:
Anis Lutfi
Condi...
15-07-08 ©SKF Slide 3
SKF Reliability Systems – Asia Pacific
Condition Monitoring Products
1SKF PLATFORM
BasicVibrationAna...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 415-07-08 ©SKF
SKF GROUP
FACTOR...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 515-07-08 ©SKF
SKF Network
15-07-08 ©SKF Slide 6
SKF Reliability Systems – Indonesia
Jaka Rusdianto
2MAINTENANCE PILOSOPHY
BasicVibrationAnalysis–
In...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 715-07-08 ©SKF
The evolution co...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 815-07-08 ©SKF
Cost of Maintena...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 915-07-08 ©SKF
How Do Predictiv...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1015-07-08 ©SKF
The Predictive ...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1115-07-08 ©SKF
WorkFlowWorkFlo...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1215-07-08 ©SKF
How are Measure...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1315-07-08 ©SKF
Buffered
Output...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1415-07-08 ©SKF
Predictive Main...
15-07-08 ©SKF Slide 15
SKF Reliability Systems – Asia Pacific
Condition Monitoring Products
3Basic Vibration Philosophy
Ba...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1615-07-08 ©SKF
Measuring Vibra...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1715-07-08 ©SKF
Measurable Vibr...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1815-07-08 ©SKF
Vibration Frequ...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 1915-07-08 ©SKF
Vibration Ampli...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2015-07-08 ©SKF
Amplitude vs. F...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2115-07-08 ©SKF
Displacement Pr...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2215-07-08 ©SKF
Velocity Sensor...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2315-07-08 ©SKF
Accelerometers
...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2415-07-08 ©SKF
SensorRelations...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2515-07-08 ©SKF
Same Data in Ve...
15-07-08 ©SKF Slide 26
SKF Reliability Systems – Asia Pacific
Condition Monitoring Products
4Vibration Analysis
BasicVibra...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2715-07-08 ©SKF
Detection vs. A...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2815-07-08 ©SKF
Types of Alarms...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 2915-07-08 ©SKF
ISO Standard
Vi...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3015-07-08 ©SKF
ISO Vibration S...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3115-07-08 ©SKF
Overall Vib. Al...
15-07-08 ©SKF Slide 32
SKF Reliability Systems – Asia Pacific
Condition Monitoring Products
5Vibration Spectrum
BasicVibra...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3315-07-08 ©SKF
What is Vibrati...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3415-07-08 ©SKF
Typical Vibrati...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3515-07-08 ©SKF
FFT SpectrumAna...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3615-07-08 ©SKF
Spectral Patter...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3715-07-08 ©SKF
Spectral Exampl...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3815-07-08 ©SKF
Sources of Vibr...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 3915-07-08 ©SKF
Misalignment
An...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4015-07-08 ©SKF
Velocity Measur...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4115-07-08 ©SKF
Imbalance - Dia...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4215-07-08 ©SKF
Velocity measur...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4315-07-08 ©SKF
Bent Shaft
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4415-07-08 ©SKF
Bent Shaft - Di...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4515-07-08 ©SKF
Velocity measur...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4615-07-08 ©SKF
Mechanical Loos...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4715-07-08 ©SKF
Enveloping meas...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4815-07-08 ©SKF
Gear-mesh Frequ...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 4915-07-08 ©SKF
GearDefects
• T...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5015-07-08 ©SKF
Acceleration Me...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5115-07-08 ©SKF
Mining Gearbox ...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5215-07-08 ©SKF
Why Do Bearings...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5315-07-08 ©SKF
Enveloping
Band...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5415-07-08 ©SKF
Bearing Defect ...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5515-07-08 ©SKF
Acceleration En...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5615-07-08 ©SKF
Acceleration En...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5715-07-08 ©SKF
Acceleration En...
BasicVibrationAnalysis– Indonesia
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 5815-07-08 ©SKF
Enveloping Seve...
15-07-08 ©SKF
SKF Reliability Systems – Indonesia
Jaka Rusdianto
Slide 59
Pleasewriteyourquestion!
Vibration Monitoring
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Vibration Monitoring

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Vibration Monitoring

  1. 1. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 115-07-08 ©SKF
  2. 2. 15-07-08 ©SKF SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2 Vibration Analysis Conducted by: Anis Lutfi Condition Monitoring, SKF Reliability Systems PT. Skefindo Primatama - INDONESIA
  3. 3. 15-07-08 ©SKF Slide 3 SKF Reliability Systems – Asia Pacific Condition Monitoring Products 1SKF PLATFORM BasicVibrationAnalysis– Indonesia
  4. 4. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 415-07-08 ©SKF SKF GROUP FACTORY UNIT • 80 Factories • 1 in Indonesia • 45,000 employees • ISO 14001 SALES UNIT SKF SALES ASIA PACIFIC SKF VIETNAM SKF THAILAND SKF TAIWAN SKF KOREA SKF PHILIPINA SKF MALAYSIA SKF SINGAPORE SKF INDONESIA (PT.SKEFINDO) etc. • 130 COUNTRY • 7,000 DISTRIBUTOR
  5. 5. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 515-07-08 ©SKF SKF Network
  6. 6. 15-07-08 ©SKF Slide 6 SKF Reliability Systems – Indonesia Jaka Rusdianto 2MAINTENANCE PILOSOPHY BasicVibrationAnalysis– Indonesia
  7. 7. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 715-07-08 ©SKF The evolution continues… Not to fix failed machinery, but to prevent machinery failing. • To maximize productivity. • To ensure machinery operates satisfactorily and continuously for its rated life - or longer. • To provide the highest machine availability, with minimum downtime due to maintenance and service. • To continuously improve the production process. • To optimize machine performance. • Smoother, efficient running machinery costs less to operate, and produces a higher quality product. • To provide a safe environment. Slide 7
  8. 8. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 815-07-08 ©SKF Cost of Maintenance $17–18 US $11–13 US $7–9 US Type of Maintenance Program Run to Failure Maintenance Predictive Maintenance Preventive Maintenance Cost of Maintenance US $/HP/Year Customer : Cevron Oil USA
  9. 9. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 915-07-08 ©SKF How Do Predictive Maintenance Programs Work?
  10. 10. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1015-07-08 ©SKF The Predictive Maintenance Cycle Measurement exceeds alarm limit Periodic Monitoring Analyze problem Repair Equipment Schedule repair(s) No Yes Increase meas. intervals
  11. 11. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1115-07-08 ©SKF WorkFlowWorkFlow PRISM4 MICROLOG ROUTE SCHEDULE (CMMS) WORK REQUEST (CMMS) C.MONITORING PLAN DAILY REPORT MONTHLY REPORT DATA ANALYSIS RELIABILITY (Keandalan) MAINTENANCE (Perawatan) PRODUCTION (Produksi) Management
  12. 12. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1215-07-08 ©SKF How are Measurements Performed? Sensors ... Sense and Convert Mechanical Energy Into An Electrical Signal
  13. 13. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1315-07-08 ©SKF Buffered Outputs Internet/ Modem SKFLAN Enhanced RS485 Ethernet DCS/PAS/PLCorother RelayOutputs 4-20ma/0-10V RS485 RS232/TCP/IP VM600 MCT CMU Microlog Pens MARLIN RS485/TCP/IP-OPC RS232 RS232 P4Only CMMS Interface /RemoteView/TrendOil /HMI OurIntegrated PlatformforCondition Monitoring
  14. 14. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1415-07-08 ©SKF Predictive Maintenance Measurements Vibration Temperature Lube Oil Process –Pressure –Flow –Speed
  15. 15. 15-07-08 ©SKF Slide 15 SKF Reliability Systems – Asia Pacific Condition Monitoring Products 3Basic Vibration Philosophy BasicVibrationAnalysis– Indonesia
  16. 16. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1615-07-08 ©SKF Measuring Vibration Vibration is considered one of the most effective measurements for monitoring the condition of rotating machinery
  17. 17. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1715-07-08 ©SKF Measurable Vibration Characteristics Frequency - What is vibrating? Amplitude - How much is it vibrating? Phase Angle - How is it vibrating?
  18. 18. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1815-07-08 ©SKF Vibration Frequency Measurements & Units • RPM(Revolutions PerMinute) • CPM(Cycles PerMinute) • CPS/Hz (Cycles PerSecond/Hertz) • Orders of Running Speed (how many times event occurs pershaft revolution)
  19. 19. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 1915-07-08 ©SKF Vibration Amplitude Measurements & Units Displacement (Distance) Mils orMicrons Velocity (Speed - Rate of change of displcmt) In./Sec. ormm/Sec. Acceleration (Rate of change of velocity) G’s - In./Sec.2 orMeter/Sec.2
  20. 20. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2015-07-08 ©SKF Amplitude vs. Frequency When analyzing vibration we lookat two components of the vibration signal, its amplitude and its frequency.  Vibration amplitude indicates the severity of the problem.  Vibration frequency indicates the source of the problem.
  21. 21. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2115-07-08 ©SKF Displacement Probe/Eddy Probe • Measure Relative Distance Between Two (2) Surfaces • Accurate Low Frequency Response • Limited High Frequency Sensitivity • Require External PowerSource
  22. 22. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2215-07-08 ©SKF Velocity Sensors • Often Measure Bearing Housings orMachinery Casing Vibration • Effective in Low to Mid Frequency Range (10 Hz to around 1,500 Hz) • Self Generating Devices • Are Electro-Mechanical Devices With Moving Parts That Can StickorFail
  23. 23. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2315-07-08 ©SKF Accelerometers • Rugged Devices • Operate in Wide Frequency Range (Near0 to above 400 kHz) • Good High Frequency Response • Some Models Suitable ForHigh Temperature • Require Additional Electronics
  24. 24. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2415-07-08 ©SKF SensorRelationships 10 100 1,000 10,000 Frequency (Hz) 10 1.0 0.1 1 0.01 100 Displacement (mils) Acceleration (g's) Velocity (in/sec) Common Machinery Operating Range Amplitude (mils, in/sec, g’s)
  25. 25. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2515-07-08 ©SKF Same Data in Velocity and Acceleration Velocity Spectrum Acceleration Spectrum
  26. 26. 15-07-08 ©SKF Slide 26 SKF Reliability Systems – Asia Pacific Condition Monitoring Products 4Vibration Analysis BasicVibrationAnalysis– Indonesia
  27. 27. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2715-07-08 ©SKF Detection vs. Analysis Detection Alarmlimits are established foreach measurement. When the measurement’s value exceeds its programmed alarmlimits, the predictive maintenance software ordata collectornotifies the analyst of a problem. Analysis Once detected, analyzing exceptional measurements provides insight to the problemitself, and to its root cause.
  28. 28. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2815-07-08 ©SKF Types of Alarms  Overall Vibration Limits  Spectral Enveloping  Spectral Bands  Phase Alarms
  29. 29. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 2915-07-08 ©SKF ISO Standard Vibration Standard ISO 2372-1974
  30. 30. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3015-07-08 ©SKF ISO Vibration Severity Chart
  31. 31. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3115-07-08 ©SKF Overall Vib. Alarm Assessing Overall Vibration Severity
  32. 32. 15-07-08 ©SKF Slide 32 SKF Reliability Systems – Asia Pacific Condition Monitoring Products 5Vibration Spectrum BasicVibrationAnalysis– Indonesia
  33. 33. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3315-07-08 ©SKF What is Vibration Analysis ? Vibration Analysis is a measure of the energy being emitted froma surface due to forced and natural oscillatory movement. The energy is captured as vibrations and displayed in two common form: 1. Time vs Magnitude - known as time wafe form 2. Magnitude vs frequency - known as FFT
  34. 34. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3415-07-08 ©SKF Typical Vibration Analysis Display Formats Overall Vibration (Trending) FFT Spectrum(Trending/Analysis) Time Waveform(Trending/Analysis) OtherProcessing Methods – Acceleration Enveloping – SEE
  35. 35. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3515-07-08 ©SKF FFT SpectrumAnalysis FFT Spectrum shows component vibration signals at theirrespective frequencies low freq. high freq. frequency amplitude frequency
  36. 36. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3615-07-08 ©SKF Spectral Pattern Recognition (velocity spectrum) 1X 2X 3X 4X frequency amplitude < 1X low frequency rotational events and harmonics (i.e. imbalance, misalignment, looseness, etc.) high frequency events (i.e. bearing or gear-mesh) 10X
  37. 37. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3715-07-08 ©SKF Spectral Example 1 2 3 baseline spectrum (norm) higher than normal 1X vibration signal 1X 2X 3X bearing freq.. gearmesh freq. higher than normal 1X and bearing vibration signals Known good measurement collected when machine was known to be in good running order. 1X running speed peak is significantly higher than normal. Indicates a vibration signal occurring once per shaft revolution. Typically caused by misalignment or imbalance. Higher than normal 1X running speed peak and bearing fault frequency peaks indicate that 1X rotational problem has caused bearing damage.
  38. 38. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3815-07-08 ©SKF Sources of Vibration Specific patterns in the spectral signatures are recognized as being related to specific machine problems. • Misalignment 1x or 2x shaft speed • Imbalance 1x • Bent shaft 1x or 2x Axial • Looseness 2x to 10x • Gearmesh # of teeth x RPM • Bearing Defects bearing defect frequencies
  39. 39. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 3915-07-08 ©SKF Misalignment Angular Misalignment Parallel Misalignment
  40. 40. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4015-07-08 ©SKF Velocity Measurement Showing Misalignment
  41. 41. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4115-07-08 ©SKF Imbalance - Diagnosis static imbalance - vibration across machine “in phase” couple imbalance - vibration across machine “180 degrees out of phase”
  42. 42. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4215-07-08 ©SKF Velocity measurement Showing Imbalance
  43. 43. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4315-07-08 ©SKF Bent Shaft
  44. 44. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4415-07-08 ©SKF Bent Shaft - Diagnosis 1 - axial measurements across machine typically 180 degrees out of phase, and ... 2 - radial measurements across machine are typically in phase
  45. 45. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4515-07-08 ©SKF Velocity measurement Showing Bent Shaft Problem
  46. 46. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4615-07-08 ©SKF Mechanical Looseness
  47. 47. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4715-07-08 ©SKF Enveloping measurement showing Mechanical Looseness Problem Journal bearing on 600 MWSteamTurbine
  48. 48. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4815-07-08 ©SKF Gear-mesh Frequencies GMF = # of teeth x RPM
  49. 49. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 4915-07-08 ©SKF GearDefects • The gear mesh frequency is equal to the gear shaft rotating speed times the number of teeth on that gear. • The amplitude will vary with the load. • Two equal gearboxes can have very different amplitudes under the same loads. • ALWAYS collect a time domain spectrum on each gear shaft bearing.
  50. 50. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5015-07-08 ©SKF Acceleration Measurement Showing Gear-mesh Frequencies
  51. 51. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5115-07-08 ©SKF Mining Gearbox Time Domain 208 RPM
  52. 52. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5215-07-08 ©SKF Why Do Bearings Fail? inadequate lubrication - too much - too little - contaminated excessive load caused by: - misalignment - imbalance - bent shaft - etc..... improperhandling or installation ageflaw on outer race
  53. 53. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5315-07-08 ©SKF Enveloping Band Pass Filter is specified according to defect harmonic frequencies of interest low frequency events filtered out, high frequency defect harmonics emphasized due to low signal to noise ratio, these high frequency harmonics are then summed and folded back to the defect’s fundamental frequency resulting enveloped signal, measured in gE defect fundamental frequency fundamental frequency harmonics
  54. 54. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5415-07-08 ©SKF Bearing Defect Frequencies BPFO Ball Pass Frequency Outer Race BPFI Ball Pass Frequency Inner Race BSF Ball Spin Frequency FTF Cage Frequency or Fundamental Train Frequency
  55. 55. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5515-07-08 ©SKF Acceleration Enveloping on bearing with Outerrace defect
  56. 56. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5615-07-08 ©SKF Acceleration Enveloping on bearing with Innerrace defect
  57. 57. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5715-07-08 ©SKF Acceleration Enveloping on bearing with Cage defect
  58. 58. BasicVibrationAnalysis– Indonesia SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 5815-07-08 ©SKF Enveloping Severity Chart ISO 10816
  59. 59. 15-07-08 ©SKF SKF Reliability Systems – Indonesia Jaka Rusdianto Slide 59 Pleasewriteyourquestion!

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