Constant surface patterns during slip form paving

A slip form paving machine, comprising:

• a machine frame;
• a plurality of ground engaging wheels or tracks for supporting the machine frame from a ground surface;
• a slip form mold supported from the machine frame for molding a mass of concrete into a formed not yet hardened concrete structure as the paving machine moves forward in a paving direction, the slip form mold having a mold width extending transversely to the paving direction;
• at least one smoothing beam supported behind the slip form mold for engaging an upper surface of the formed not yet hardened concrete structure to smooth the upper surface, the at least one smoothing beam being configured to oscillate transversely to the paving direction;
• at least one advance speed sensor configured to provide an advance speed signal corresponding to an advance speed of the slip form paving machine in the paving direction;
• and
• a controller configured to receive the advance speed signal and to generate a command signal to control a frequency of transverse oscillation of the at least one smoothing beam such that a constant relationship is maintained between the advance speed and the frequency of transverse oscillation.