Research on the Multi-domain Modeling and Optimizing Method for Loader Executing System

The multi-function loader is a complex system in which mechanical, electronic, hydraulic and control systems are assembled. It has a significant multi-disciplinary coupling characteristic. The traditional single-domain modeling simulation tools can not do the simulation and optimization of overall performance for modern complex products. In view of this situation, the paper studied the modeling methods of the multi-function loader executing systems, and established the dynamic, hydraulic and control models. At the same time the paper analyzed the coupling relationship between the hydraulic system model and the mechanical system model to ensure the accurate agreement among the loader hydraulic system simulation and the gestures and movements, proposed the realization method of the static pressure transmission and control with the cascade feedback of the diesel engine´s output speed and variable pump´s output speed to improve the speed, pressure, power adjustment range of the loader and the ability to adapt working conditions. The PID adjustment method was used to control the shovel turning and maintain horizontal in the moving process. In the iSIGHT environment, the numerical optimization algorithm of sequential quadratic programming was adopted as an optimization program to achieve the multi-disciplinary collaborative optimization of the loader.