Flexible Multi-body Dynamics Simulation Of Dynamic Compactor Based On Terramechanics

The foundation reinforcement of dynamic compaction, with the advantages of convenient, economical, simple process etc., is wildly used in worldwide, but as a kind of dedicated equipment for this method, there is no national standard for the dynamic compactor's design ind manufacture. At present, a lot of dynamic compactors are made by adding auxiliary devices on the crawler cranes in domestic, and the design method and standards are also nainly referenced with those of ordinary crane. But compared with the ordinary cranes, iynamic compactor has sharply high load factor, sudden unloading, frequent operations and3ther working characteristics, therefore, the dynamic compactor dynamics research which oased on the structural strength analysis and stiffness analysis is very necessary.In this paper the400t· m dynamic compactor was took as the research object, which was developed by Construction Machinery Institute of Dalian University of Technology. In the platform of dynamic simulation software ADAMS, which combined with finite element analysis software ANSYS, the flexible multi-body dynamics model of the dynamic compactor was built. Considering the influence of the base that the dynamic compactor stands while in operation, the terramechanics was introduced into the model, and with the C language the track-soil interaction model was developed in ADAMS/View.The dynamic simulations were finished under various working conditions:different soil types, different load radius and whether considering the ant-backward-leaning leg effect. Through the simulations some problems are found, such as the back rod of A-frame, the peak pressure in the hydraulic circle of ant-backward-leaning leg was too high. An experiment was carried out under the9.7m load radius working condition, the simulation results were accordance with the experiment data with the relative error of13.4%.According the simulation, the results can be used as a reference for the design and improvement of this dynamic compactor. A dynamic design method is proposed. This paper made a significant attempt on the dynamic simulation research of the complex construction equipment. The method also provides a reference to other relevant study on the complex mechanical systems.