A Simplified Method for Finite Element Analysis of Rollover Protective Structure
A protection structure and finite element technology, which is applied in the field of finite element analysis and simplification of rollover protection structures, can solve problems such as difficulty in convergence, cumbersome operation, and long solution time, so as to reduce the difficulty of analysis convergence, save analysis resources, and simplify the operation steps. Effect
Active Publication Date: 2021-05-18
TIANJIN JINAN HEAVY IND
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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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[0068] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0069] The present invention utilizes the nonlinear elastic axis connections in the three directions of x, y, and z to replace the definition of complicated materials and contact properties of elastic vibration absorbers for rollover protective structures (ROPS); use beam (beam) connection and bolt connection sub-model analysis According to the national standard GB / T 17922-1999, optimize the establishment of the rollover protective structure (ROPS) analysis load combination sequence.
[0070] Below, take a certain type of rollover protective structure (ROPS) as an example, utilize the method of the present invention to carry out the finite element analysis of the rollover protective s...
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The invention discloses a simplified method for finite element analysis of a rollover protective structure. The method utilizes nonlinear elastic axis connections in three directions of x, y, and z to replace the definition of complex materials and contact properties of an elastic shock absorber of a rollover protective structure; The combination method of beam connection and bolt connection sub-model analysis evaluates the bolt connection strength in the rollover protective structure; optimizes the load combination sequence of the rollover protective structure analysis according to the corresponding standards. The invention not only considers the mechanical influence of the elastic shock absorber on the rollover protection structure, but also avoids the complex constitutive relation definition and contact behavior definition of the elastic shock absorber, and reduces the difficulty of analysis convergence on the basis of ensuring the analysis accuracy; makes the bolt connection The analysis is fast and accurate; the complex rollover protection structure analysis problem is transformed into an analysis combination from simple to complex, which saves analysis resources; the operation steps are simple and the versatility is strong.
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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IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor金慧迪
OwnerTIANJIN JINAN HEAVY IND