Hydraulic excavator is a kind of multifunctional construction machinery, which is widely used in construction industry, mining industry and water conservancy engineering. However, in its actual work, the efficiency from engine to hydraulic pump is about 75% due to the mismatch of power source under partial load conditions, and the efficiency of hydraulic control system is only about 30% due to throttling loss. In the whole working process of the excavator, rotary work occupies a large proportion. According to statistics, the time occupation of rotary work in the whole working cycle of the excavator reaches 50% ~ 70%, and the energy consumption accounts for 25% ~ 40% of the total energy. Due to the large inertia of the hydraulic excavator, the energy consumption in the rotary process is large, and the running stability is poor. With the rapid development of society and economy, the problem of energy shortage is becoming more and more serious. Therefore, it is of great significance to study the stability and energy saving of excavator slewing process.
