Guyan reduction
In computational mechanics, Guyan reduction, is a dimensionality reduction method which reduces the number of degrees of freedom by ignoring the inertial terms of the equilibrium equations and expressing the unloaded degrees of freedom in terms of the loaded degrees of freedom. == Basic concept == The static equilibrium equation can be expressed as: K d = f {\displaystyle \mathbf {K} \mathbf {d} =\mathbf {f} } where K {\displaystyle \mathbf {K} } is the stiffness matrix, f {\displaystyle \mathbf {f} } the force vector, and d {\displaystyle \mathbf {d} } the displacement vector.