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This seminar aims to systematically organize practical diagnostic methods using FFT, STFT, wavelet, order tracking ratio, and tracking analysis for gear vibration and noise problems, and to develop the ability to consistently judge from cause identification to countermeasures.
Furthermore, gear-specific phenomena such as harmonics, sidebands, and modulation are explained from both generation mechanisms and spectral characteristics, and nonlinear vibration involving grease lubrication is also covered from a practical standpoint.
Based on real-world misdiagnoses and overlooked cases, the seminar is structured to help participants acquire not just knowledge but a “decision-making process.”

・ Clarification of “selection criteria and limitations” for each analysis method
・ How to understand harmonics, sidebands, and modulation by decomposing causes
・ Practical interpretation of nonlinear vibration caused by grease lubrication
・ Reproducible narrowing-down process for root cause identification
・ Decision logic linking directly to countermeasures

• 1. Actual gear vibration and noise problems
  
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  1-1 Classification of typical field problems (noise, resonance, periodic variation)
  1-2 Overlooked root causes (non-gear factors: shafts, bearings, assembly)
  1-3 Structure of misdiagnosis and how to avoid it
  
  2. Primary diagnosis using FFT
• 
  2-1 Meaning of frequency peaks (mesh, rotation, harmonics)
  2-2 Evaluation method based on relationships rather than peak magnitude
  2-3 Common misjudgment patterns and correction methods
• 
  3. Detailed diagnosis using STFT and wavelet analysis
  
  3-1 Extraction of time variation (steady vs non-steady)
  3-2 Method to narrow causes by “how abnormalities appear”
  3-3 Common interpretation mistakes
  
  4. Synchronous analysis using order tracking ratio
  
  4-1 Distinguishing rotation-related vs non-synchronous phenomena
  4-2 Practical use of order tracking ratio
  4-3 Pitfalls and correct interpretation of tracking analysis

• 5. Understanding phenomena characteristics
  
  5-1 Conditions and appearance of harmonics and sidebands
  5-2 Specific waveform/spectrum correspondence of modulation (AM/FM)
  5-3 Distinguishing similar but different phenomena (misdiagnosis prevention)

• 6. Lubrication-induced vibration and noise
  
  6-1 How to detect grease abnormalities (selection error, quantity, degradation, distribution)
  6-2 Large abnormal noise caused by nonlinear phenomena due to lubrication
  6-3 Separation from mechanical causes (critical point of failure if mistaken)
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• 7. Practical flow from diagnosis to countermeasures
  
  7-1 Rapid decision-making (priority setting in field work)
  7-2 Narrowing-down procedure for root cause identification
  7-3 Countermeasure selection (design change / assembly / lubrication)
  7-4 Checkpoints for recurrence prevention