Quantum systems where electromagnetic fields couple to mechanical vibrations through artificial two-level atoms are investigated. Different quantum effects are obtained for the generated phonon fields like sub-Poissonian distributed phonons and superradiant like phonon dynamics. The first effect is observed when strong couplings among a pumped two-level quantum dot (QD) and a single-mode mechanical resonator are considered. These coupling regimes require the system dynamics to be treated beyond a usual secular approximation, leading to sub-Poissonian distributed phonon fields. The case of cooperative effects is investigated when an ensemble of QDs are placed on the mechanical resonator closely enough to satisfy the usual conditions of superradiance. Here, the fast dynamics of the decaying QDs is transferred to the phonon field and, therefore, short phonon pulsed are observed. The mechanical vibrations are also enhanced due to the collective phonon emission. The phonon enhancement shows different proprieties comparing to the cooperative QD fluorescence, due to different nature of the QD-phonon interaction as well as different nature of the environmental damping reservoir.