The oscillation principle at a glance:
In an oscillation drum, two eccentric shafts are fitted at a 180° angle to each other. Both unbalanced masses rotate synchronously, which causes the drum to perform a rapidly alternating forwards-backwards rotational movement. This results in the compaction energy being transmitted forwards and backwards tangentially into the ground below in the form of shear forces. The drum is therefore in constant contact with the ground, which means that permanent static compaction also takes place because of the weight of the machine, as well as compaction caused by the shear forces. The result: Faster, more significant compaction increases.