Finite element analysis simplified method of turnover protection structure

Abstract

The invention discloses a finite element analysis simplified method of a turnover protection structure. The method includes the steps that non-linear elastic shafts in the direction x, the direction yand the direction z are connected, and complex materials and contact attribute definitions of an elastic vibration absorber of the turnover protection structure are replaced; a combination method ofbeam connection and bolt connection sub-model analysis is used for evaluating the bolt connection strength in the turnover protection structure; the turnover protection structure is optimized according to a corresponding standard to analyze a load combination sequence. The mechanical influence of the elastic vibration absorber on the turnover protection structure is considered, the complex constitutive relation definition and the complex contact behavior definition of the elastic vibration absorber are avoided, and the convergence analysis difficulty is reduced on the basis of guaranteeing theanalysis precision. Bolt connection analysis is rapid and accurate. A complex turnover protection structure analysis problem is converted into an analysis combination from simple to complicated, andanalysis resources are saved. Operating steps are simple, and high universality is achieved.

Description

technical field [0001] The invention relates to the technical field of finite element simulation analysis methods, in particular to a simplified method for finite element analysis of a rollover protective structure (ROPS). Background technique [0002] Some machines with harsh working conditions but requiring the driver to operate them personally, such as construction machinery, mining machinery, agricultural machinery, etc., are usually equipped with a Roll-Over Protective Structure (ROPS). ROPS is a passive protection device, its function is to reduce the possibility of the driver being crushed when the machine rolls over. The rollover protective structure usually includes welded structural parts, bolted connection devices and elastic shock absorbers, etc. The protective performance of the rollover protective structure is a comprehensive reflection of the combined effects of welded structural parts, bolted connection devices and elastic shock absorbers. [0003] According...

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Problems solved by technology

In the finite element material properties, the plastic properties of the welded structural parts and the nonlinear material properties of the elastic shock absorber must be considered, and the convergence of the analysis process is difficult;

[0007] (2) ROPS analysis is a multi-step analysis. Generally, it is necessary to consider the mechanical properties of the process of lateral loading, lateral unloading, vertical loading, vertical unloading, longitudinal loading, and longitudinal unloading in sequence. At least 6 analysis steps need to be established. The result of one analysis step will directly affect the result of the next analysis step, and the solution process is complicated;

[0008] (3) Each analysis step of ROPS analysis contains a large number of units and contact behaviors, and the solution time is long

[0017] (1) Ignore elastic shock absorbers such as rubber shock absorbers in ROPS, which are contrary to national standards, and the simulated energy absorption curve is quite different from the actual one;

[0018] (2) After simplifying the bolted connection in ROPS to binding constraints, the simulation model becomes rigid, and the simulation analysis completely loses the reference value of bolted connection performance evaluation;

[0019] (3) The method of using nonlinear spring elements to simulate elastic shock absorbers is cumbersome to operate, and some mainstream software does not directly support this function, which requires higher levels of users

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