NUMERICAL STABILITY OF MASS LUMPING SCHEMES FOR ...

Newmark methodDiscrete operator(K + 4 )( 4∆t 2M u t+∆t = R t+∆t + M + 2 ∆t 2ut ∆t ˙ut + ∆tüt 4 )Dispersion curvesCo = 0.00–0.25 Co = 0.25–1.00Insensitive to time step for Co ≤ 0.25.