Dynamic Simulation And Optimization Of The Key Components Of Automobile Crane Based On ADAMS

When the truck crane works,while lifting heavy suddenly,the telescopic boom will be subjected to severe vibration by impact load,which seriously affects the safety and service life of the truck crane.The amplitude variation mechanism is an important part of the truck crane.The design of the amplitude variation mechanism determines the performance of the truck crane.Therefore,it is of great practical significance and high application value to study the telescopic boom and the amplitude variation mechanism.In this paper,the dynamic analysis of the telescopic boom is carried out,and the position of the pin-connected joints of the amplitude variation mechanism is optimized.The obtained results provide valuable reference for improving the stability and reliability of the truck crane.The main contents of this paper are as follows:Firstly,according to the parameters of the crane telescopic boom,the model of the telescopic boom and sliders is accurately built by using the SolidWorks software.In addition,the other components of truck crane are simplified.After which,the established components are assembled according to the working principle of the truck crane.Secondly,the mesh of each telescopic boom and the whole boom is divided by using the ANSYS software.Then the modal analysis of the fifth telescopic boom and the whole boom is carried out,and obtain the first eight natural frequencies and mode shapes respectively,which provide data support for avoiding resonance of the telescopic boom.Thirdly,the rigid-flexible coupling model of the telescopic boom is created in the ADAMS software.The maximum displacements,accelerations and stress of the telescopic boom are obtained for two different load case.The case when the turntable is static and loaded suddenly is considered first.Then the analysis for the second case when the turntable is rotating and unloaded suddenly is given.The results showed that: when turntable is non-rotating and unloaded suddenly is given,the amplitude of the telescopic boom head in horizontal direction is larger than that in vertical direction.It is proved that the stability of truck crane in horizontal direction is poor.when turntable is rotating and unloaded suddenly is given,the stress of the boom is larger than that of the turntable at rest,and the acceleration of the boom head in the vertical direction is reduced,and the acceleration of the boom head in the horizontal direction become larger.Finally,the parametric model of the amplitude variation mechanism is built in ADAMS to optimize the pin-connected joints of the amplitude variation mechanism.The maximum angle elevation and the lifting height of the crane telescopic boom are viewed as the constraint conditions.The force of the cylinder is chose as an optimized goal.As a result,the position of the pin-connected joints of the amplitude variation mechanism is more reasonable,and the maximum force of the cylinder is reduced by 4.17%.