  Energy dissipation by fast crystalline defects takes place mainly through the
resonant interaction of their cores with periodic lattice. We show that the
resultant effective friction can be reduced to zero by appropriately tuned
acoustic sources located on the boundary of the body. To illustrate the general
idea, we consider three prototypical models describing the main types of
strongly discrete defects: dislocations, cracks and domain walls. The obtained
control protocols, ensuring dissipation-free mobility of topological defects,
can be also used in the design of meta-material systems aimed at transmitting
mechanical information.
