Damper Elements And Node Dampers
Damper elements and node dampers are ‘elements’ with no stiffness but
with viscosity, so these do not form stiffness matrices but instead a
damping matrix. The general form of the damping matrix is
C=⎣⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢⎡cx0cy00cz000cxx0000cyy00000czz−cx00000cx0−cy00000cy00−cz00000cz000−cxx00000cxx0000−cyy00000cyy00000−czz00000czz⎦⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥⎤ For an axial or torsional damper only the cx or cxx terms are
specified, the rest are assumed to be zero.
Dampers are assumed to be massless.