Finite element structural calculation method for cylindrical boom system of overhead working truck

Abstract

The invention discloses a finite element structural calculation method for a cylindrical boom system of an overhead working truck. The method comprises the steps as follows: respectively performing geometric processing, mesh generation and cell attribute definition to each cantilever crane and a luffing mechanism according to a geometrical model of the boom system, establishing finite element models for the cantilever crane and the luffing mechanism; assembling the model in each part; performing mechanics simplification to a connecting relation among part of structures according to a practical physical model, and setting a freedom constraint to the nodes at the place of a lower pivot point of a derricking cylinder and a back pivot point of the cantilever crane; and finally applying load and performing solving. The method can be used for accurately calculating geometric nonlinear effect generated by large deformation of the long cantilever crane to structural stress, inputting a working file to define a working condition of multi-group calculation, and performing auto-batching calculation to the plurality of working conditions, reducing calculating time of sub-working condition. A designer could intuitively get result information of different working conditions and different postures. The method can be used for automatically realizing normal transmission of forces among different components and calculation of a local structure to improve computational efficiency and precision.

Description

technical field [0001] The invention relates to a finite element structure calculation method, in particular to a finite element structure calculation method for a cylindrical boom system of an aerial work vehicle, and belongs to the technical field of aerial work vehicles. Background technique [0002] High-altitude operation vehicle is a kind of special vehicle with the functions of high-altitude rescue, high-altitude transportation of materials and high-altitude engineering operations. It is widely used in engineering construction and emergency rescue. Among them, the telescopic boom aerial work vehicle with cylindrical boom has become the only solution for the working height above 50 meters due to its advantages of high working height and large working range. The cylindrical boom system usually includes multiple sets of multi-section telescopic booms, and a telescopic system composed of hydraulic cylinders, wire ropes, leaf chains, etc. is used to achieve telescopic move...

AI Technical Summary

Problems solved by technology

The analytical algorithm is calculated based on the ideal beam model, so it is only applicable to the main part of the cylindrical boom, and cannot handle the luffing mechanism at the joint of the boom. Therefore, when calculating the combined boom system, it needs to be split into groups Calculation, the amount of calculation is large, and the boundary force loading at the connection of the luffing mechanism is inaccurate;

[0007] (3) The analytical algorithm is calculated based on the ideal beam model, so the local structural stress at the joints of mechanisms such as oil cylinders and plate chains cannot be calculated;

[0008] (4) For some structural forces such as the telescopic system and the luffing mechanism, manual derivation formula calculation is required, the derivation process is cumbersome and the amount of calculation is large

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