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ENTC 395

ENTC 395. Lecture 3b Rotational Mechanical Systems. Today. Rotational Systems Simple Rotational Systems Properties of components Some examples Combined rotation and translation Some Examples 2DOF system. 5. Position. 0. -5. 0. 2. 4. 6. 8. 10. Time.

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ENTC 395

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  1. ENTC 395 Lecture 3b Rotational Mechanical Systems

  2. Today • Rotational Systems • Simple Rotational Systems • Properties of components • Some examples • Combined rotation and translation • Some Examples • 2DOF system

  3. 5 Position 0 -5 0 2 4 6 8 10 Time 2nd order translating system Solution for a simple translating system

  4. Shaft k Applied Torque T(t) q Damper c c k Flywheel J J 2nd order rotating system Solution for a simple translating system

  5. Mass moment of inertia J The mass, m in a translational system becomes a mass moment of inertia, J in a rotating system

  6. A flywheel brake F An example: q

  7. L Shaft Stiffness Shafts are treated as springs in a rotating system

  8. m Damped suspension system Another example: A model: Geometry of system

  9. 2 degree of freedom system 2DOF Solution for a system model requiring two independent coordinates The model of the system

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