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Which treatment reduces panel radiated noise?

  • A.Damping material bonded to the panel
  • B.Increasing the stiffness of the panel, which raises its natural frequency above the range of audible sound
  • C.A thicker paint layer
  • D.Additional spot welds around the perimeter, which restrain the panel and prevent it from vibrating at all

Answer: A

A constrained layer damping pad converts the vibrational energy of the panel into heat and substantially reduces the sound it radiates. Stiffening moves the resonance rather than removing it and cannot raise it above the audible range. Extensive use of such pads is one reason modern vehicles are so much quieter than their predecessors.

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