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This seminar focuses on bearings, which are the core cause of vibration problems in rotating machinery. It systematically explains the mechanism of vibration generation, characteristics of failure modes, vibration analysis methods, and practical diagnostic workflows. In addition, sound listening demonstrations connect intuitive understanding with theoretical understanding, aiming to develop practical diagnostic skills.

・ Understanding the mechanism of bearing vibration generation
・ Organizing relationships between failure modes and vibration characteristics
・ Mastering practical analysis methods such as FFT and envelope processing
・ Establishing on-site diagnostic flow and evaluation criteria
・ Utilization of sound-based auxiliary diagnostics

• 1. Overview of Rotating Machinery Vibration and Role of Bearings
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  1-1 Classification of vibration sources in rotating machinery (unbalance, misalignment, bearings)
  1-2 Why bearings are the “most critical vibration source”
  1-3 Force flow and vibration transmission path in rotating systems
  1-4 Mechanism by which bearing damage propagates to other components
  
  2. Mechanism of Bearing Vibration (Contact, Rolling, Lubrication)
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  2-1 Generation of periodic impact forces due to rolling contact
  2-2 Influence of oil film stiffness and damping characteristics on vibration
  2-3 Conditions for sliding and micro-slip (skidding)
  2-4 High-frequency vibration amplification under poor lubrication conditions
• 
  3. Typical Failure Modes (Inner ring, Outer ring, Rolling elements, Cage)
  
  3-1 Relationship between inner ring damage and load rotation system
  3-2 Characteristics of outer ring damage and fixed-frame vibration
  3-3 Random impact components due to rolling element damage
  3-4 Low-frequency modulation vibration due to cage damage
  3-5 Vibration superposition patterns in combined failures
  
  4. Interpretation of Vibration Waveforms and Spectra (Practical Analysis)
  
  4-1 Identifying impact-type vibration in time waveforms
  4-2 Detection of characteristic frequencies in FFT spectra
  4-3 Meaning of sideband structure and evaluation of deterioration progress
  4-4 Detection of micro-damage using envelope processing
  4-5 Distinguishing from structural natural vibration of rotating machinery that causes misdiagnosis

• 5. Practical Diagnostic Procedure (Field Decision Flow)
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  5-1 Initial screening procedure in the field
  5-2 Importance of measurement conditions (speed, load, sensor position)
  5-3 Concept of primary judgment criteria for normal/abnormal states
  5-4 Evaluation of deterioration levels (minor damage to critical range)
  5-5 Checklist operation to prevent misdiagnosis

• 6. Sound Diagnosis Demonstration and Characteristics
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  6-1 Differences between normal operation sound and early damage sound
  6-2 Comparison of inner/outer/rolling element failure sounds
  6-3 Characteristics and periodicity of cage failure sound
  6-4 Identification of lubrication failure sounds (dry sound, metal friction sound)
  6-5 Limitations and effective range of sound-based diagnosis

• 7. Countermeasure Design and Recurrence Prevention
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  7-1 Optimization of lubrication conditions (oil type, viscosity, supply method)
  7-2 Load conditions and misalignment reduction design
  7-3 Relationship between stiffness design and vibration suppression
  7-4 Assembly accuracy and prevention of initial damage
  7-5 Design review items for recurrence prevention

• 8. Q&A