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Elastic energy loss spectra for La1.88-yNdySr0.12CuO4 (LNSCO) polycrystalline samples (y=0, 0.20, 0.30, 0.40, 0.50, 0.60) show a transformation of charge stripes from dynamic to static state. A sharp peak P, in energy. loss spectrum around,70 K observed for y >= 0.3 samples indicates the formation of static stripe order, and a relative stiffening of the sound velocity below P-1 temperature suggests the development of the static charge stripes Both the intensity of P-1 and the relative stiffening of the velocity increase with increasing Nd doping due to the stabilization of the static charge stripes. The evolution of another new broad peak P-2 observed around 100 K, which has never been reported for the system before, is consistent with the scenario of interaction between dynamic charge strips and pinning centers. The activation energy of the charge stripes overcoming the pinning centers was suggested to increase with increasing Nd doping.