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Vibration Engineering Mouli (IIT Madras) Lecture @ITK Jan 2014
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1 What? Why ? How? 2 Modeling Issues 3 Single degree-of- freedom 4 Multi-degree-of-freedom systems Generating MDOF models Uncoupling MDOF systems Examples Lecture NITK Jan 2014 2 / 61
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What causes vibrations? First up let us define “vibration” To and fro motion What causes it? Dynamic loads Internal generation mechanisms Unbalan ce forces in engines/t urbines External mechanisms Wind 3 / 61
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What else needed? For systems to vibrate the following components are essential Inertia or mass From an energy perspective inertia associated with kinetic energy Deformation: Compliance or Stiffness Stiffness associated with strain or potential energy The exchange of energy from one form to another leads to the to and fro motion defined earlier as vibration Dissipation or damping also involved 4 / 61
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Why bother about vibrations? Need to design for dynamic loads Fatigue failures can occur Need to avoid resonances or minimize its effect Sound radiation from structures due to vibration Human comfort issues Mouli (IIT Madras) 5 / 61
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  • Fall '16
  • sumant tadepalli
  • 1981, January, 1990, IIT Madras

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