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This seminar organizes the differences in the conditions for phase-inversion control in vibration and noise, and explains the fundamental reasons behind the common issue of “it works in theory but not in practice.”
Based on failure cases caused by treating vibration and noise as identical, it clarifies the conditions under which control succeeds and fails in a structured manner.
Furthermore, through practical decision-making flows and design methods, the aim is to establish phase-inversion control as a usable engineering technique.

・ Differences in conditions for phase-inversion control between vibration and noise
・ Typical failure patterns in practical applications and their structure
・ Control limitations due to modes, waves, and spatial dependence
・ Practical methods for identifying dominant factors in vibration and noise
・ Practical workflow from measurement to design and failure avoidance points

• 1. Usable Range and Dangerous Misconceptions of Phase-Inversion Control
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  1-1 Why the meaning of phase inversion differs between vibration and noise
  1-2 Why it disappears in theory but not in practice
  1-3 Decision domains omitted in ChatGPT and textbooks
  1-4 The dividing line between successful and failed designs
  
  2. Practical limits of vibration control
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  2-1 Conditions under which modal control holds and breaks down
  2-2 Why non-damped natural frequency alone is not sufficient
  2-3 Reverse amplification phenomenon caused by incorrect control point selection
  2-4 Failure patterns in sensor/actuator placement
  2-5 Mechanism by which delay (phase shift) destroys stability
  2-6 Typical cases where it does not work in real machines (design is correct but no effect)
  
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  3. Practical limits of noise control
  
  3-1 The space where wave interference is effective is extremely limited
  3-2 Phenomenon where “disappeared sound” increases elsewhere
  3-3 Why only low frequencies are effective while high frequencies are not
  3-4 Microphone-position dependence and structure of control failure
  3-5 Typical failure patterns of ANC in industrial machinery
  3-6 Fundamental reason sound field control does not behave as designed
  
  4. Distinguishing vibration and noise causes
  
  4-1 Design mistakes caused by misidentifying vibration or acoustic origin
  4-2 How to distinguish structure-borne and air-borne transmission (field criteria)
  4-3 Method to instantly determine dominant factors from measurement data
  4-4 Criteria for identifying targets that should not be controlled
  4-5 Common patterns of cost-wasting designs
  
• 5. Practical implementation design flow
  
  5-1 Measurement → analysis → decision → design workflow
  5-2 Settings that must not be used in the initial stage
  5-3 Pre-evaluation logic for whether control can be established
  5-4 Verification method in small-scale experiments (prevention of scaling errors)
  5-5 Common design concepts in successful cases
  
  

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  7. Q&A