Abstract: Aiming at the problem that the crane luffing process cannot be accurately simulated since the accurate mechanical structure model is not established in the traditional simulation analysis, firstly, based on the analysis of the working principle and simplified mathematical model of the luffing mechanism, the high-precision 3D mechanical structure and hydraulic system simulation analysis models are established respectively based on the software NX and AMESim;Then, the mechanical and hydraulic co-simulation system is built based on mechanical-hydraulic interface in Simcenter 3D(motion analysis module of NX). The key parameter curves such as rodless cavity pressure of the hydraulic cylinder and luffing angle in the luffing rise process are simulated and calculated, and the simulation analysis results based on AMESim in the traditional situation are further calculated;By comparing the results of mechanical and hydraulic co-simulation and simulation analysis based on AMESim with the test results, it can be seen that the distribution curves of key parameters such as rodless cavity pressure and luffing angle analyzed by co-simulation are closer to the test curves, which can greatly improve the simulation analysis accuracy and more accurately simulate the luffing action process of crane.

Key words: crane luffing system, mechanical and hydraulic coupling, co-simulation, 3D structure model, luffing angle