The engine operation and interaction between
working parts and soil are two most important factors
related to mini-tiller vibration. When mini-tiller tilled
the soils, the handle vibration decreased compared to
static conditions. The damping of soil decreased the
mini-tiller vibration and affected the frequency structure
at the handle. In fact, all the engine vibration
frequencies will transmit to the handle. However, when
the tiller worked, that soil absorbing energies of some
frequencies leaded to the first unbalanced inertia force of
the engine becoming the main reason why handle vibrates
violently.