how can the lower vibration be produced?
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The primary method of reducing noise and vibration is to minimize their generation. This can be accomplished by: Balancing rotating components. Reducing the mass of reciprocating members.
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When sound waves move through the air, each air molecule vibrates back and forth, hitting the air molecule next to it, which then also vibrates back and forth. The individual air molecules do not "travel" with the wave. They just vibrate back and forth.
When the vibrations are fast (high frequency), you hear a high note. When vibrations are slower, you hear a lower note.
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