| With the oversize and heavy-duty development of the truck crane recently, large-tonnage and super large-tonnage truck cranes have developed rapidly. Therefore, it is need to add axles to meet the requirement of the large-tonnage truck crane in the classis design, and thus double axles steering or multi-axle steering truck cranes have emerged as the times require, which make the research and analysis of the multi-axle steering system kinematics become more and more important. In view of the concrete structure of double front axles steering, and base on related automobile theories and the connecting rod mechanism kinematics, this thesis theoretically analysis the multi-axle steering trapezia and the steering rotary arm mechanism, and establishes an integral space mathematical model of the steering system on the basis of previous achievement. Based on this, an optimization model of the double front axles steering system is established by optimized design ideas and methods, then write an optimization program to optimize design by the calculation software MATLAB in the first place. Secondly contrast and analyze the fore-and-aft result of the steering system by the simulation software ADAMS. Lastly simulate and optimize the steering mechanism further by software ADAMS.This thesis offers a rapid design method, a simple, modifiable, intuitive precise design method, for the design and development of multi-axle steering system. By the simulation technology simulate the movement of the steering mechanism, and calculate the corner geometry relation among steering wheels and some parameters variety of the steering mechanism affecting the steering performance, and as a reference for the steering mechanism design. Therefore, it can shorten the exploitation period greatly and improve the design quality. In this thesis the simulation technology was validated on the experiment of a new truck crane and obtained a good result. The results show the simulation technology is correct.
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