  We present an exact and fully analytical treatment of the entanglement
dynamics for an isolated system of $N$ coupled oscillators following a sudden
quench of the system parameters. The system is analyzed using the solutions of
the time dependent Schrodinger's equation, which are obtained by solving the
corresponding nonlinear Ermakov equations. The entanglement entropies exhibit a
multi-oscillatory behaviour, where the number of dynamically generated time
scales increases with $N$. The harmonic chains exhibit entanglement revival and
for larger values of $N (> 10)$, we find near-critical logarithmic scaling for
the entanglement entropy, which is modulated by a time dependent factor. The
$N=2$ case is equivalent to the two site Bose-Hubbard model in the tunneling
regime, which is amenable to empirical realization in cold atom systems.
