DIIDynamic

DIIDynamic	nsteps #(in)
	deltaT #(rn)
	alpha #(rn)
	beta #(rn)
	Psi #(rn)

Represents direct implicit integration of linear dynamic problems. Damping is modeled as Rayleigh damping $(\boldsymbol{c} = \rm {alpha}*\boldsymbol{M} + \rm {beta} * \boldsymbol{K})$. Parameter Psi determines integration method used, forPsi = 1 the Newmark and for Psi $\ge$ 1.37 the Wilson method will be used. Parameter deltaT is required time integration step length.