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  • A Better Way to Damp Machine Vibrations
    Constant-natural frequency isolators outperform conventional mounts and cost less than active damping systems. In the last issue of MACHINE DESIGN, we examined methods to predict how vibration-isolation systems would perform. ( "Shaking up vibration models, " Nov. 6, 2008, p. 63 to 68
  • Shaking up vibration models
    vibration frequency (expressed as o/ o ) and isolator damping (expressed as a fraction z of the critical damping z of the system). Thus, the object vibrates less than the supporting surface if vibration frequency o >= 1.41 o . Lower-stiffness vibration isolators decrease the natural frequency o
  • Shaking up vibration models
    on supporting-surface vibration frequency (expressed as o/ o ) and isolator damping (expressed as a fraction z of the critical damping z of the system). Thus, the object vibrates less than the supporting surface if vibration frequency o >= 1.41 o . Lower-stiffness vibration isolators decrease the natural
  • Shock, awe, and vibration
    solutions) and solid elastic materials. That's because these so-called viscoelastic materials have a hybrid of qualities. Purely elastic materials store energy during loading then fully return when the load is removed. In contrast viscoelastic materials have a high damping coefficient that returns
  • Say goodbye to shift clunking
    as the ring nearest the drive gears turns faster than its counterpart at the propeller end. R &D materials engineer Scott Olig says the rods act as springs damping transient vibration and high shock loads. The ring-shaped parts made from Delrin 150 acetal from Wilmington, Del., also give the titanium rods

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