Autoregressive moving average model and its parameter estimation for earth pressure balance system of shield
LI Shou-j · Meitan xuebao · 2014
In order to characterize time delaying property and increase forecasting precision of earth pressure balance system of shield,an autoregressive moving average( ARMA) model was proposed. Based on optimization algorithm,parameter estimation procedure was presented to determine ARMA model parameters. The experimental investigation shows that compared with classic mechanism model,ARMA model obviously increases fitting and forecasting precisions. The maximum relative error of computed earth pressure falls from 41% to 9% forecasted by ARMA model. According to experimental data,the time delaying properties of the dynamic response of the system was discussed. The affection of past rotating speed of conveyor on earth pressure on next time is more obvious.