The dynamical model of a cold milling machine and its adaptive power control simulation

Abstract

Based on the work process and the structure of a cold milling machine, the mathematical models of the engine, the pump system and the work equipment are derived; the models of the drive system and the fixed displacement motor are also constructed. A model of the whole system is established. The laws between the load and the work speed at a milling depth of 8 cm are investigated through simulation and experiment. Whether the utilization of the engine power is reasonable or not is verified through the simulation. The results show that it is reasonable and effective to use the work speed of the cold milling machine as the main control parameter, and the engine can be set to work at its rated power by self-adjustment of the adaptive power control system. In this case, the rated power utilization ratio of the engine is improved by more than 8% and the machine efficiency is raised at least 10%. Furthermore, the error between the machine work speed in simulation and the experimental value is a maximum of 8.1%. The machine performance can be expressed appropriately by the model. This model can provide a theoretical reference for the machine control system and a new way to study the milling machine system.