Oil tank fluid-solid coupling transient analysis method and system considering liquid additional mass

Abstract

The invention discloses an oil tank fluid-solid coupling transient analysis method and system considering liquid additional mass, and relates to the field of automobiles. The method comprises the following steps: mapping the node displacement of a previous moment point to an established fluid model, and with the node displacement of the previous moment point as an input boundary, performing fluidcalculation on the fluid model at the current moment to obtain the dynamic pressure and the total pressure of the fluid on the wall of the oil tank at the current moment; mapping the total pressure and the liquid additional mass at the current moment point to the established structural finite element model; performing transient response analysis on the structural finite element model to obtain node displacement, acceleration and stress of grid nodes of the structural finite element model at the current moment; and performing fatigue calculation based on the stresses of the grid nodes at all the time points. The structural fatigue of the oil tank, caused by liquid shaking, can be accurately simulated.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a fluid-solid coupling transient analysis method and system for a fuel tank considering the additional mass of liquid. Background technique [0002] At present, for the transient analysis of the fluid-solid coupling of the fuel tank, the main method is to establish the fluid domain of the oil and the structural domain of the fuel tank respectively, and use the transient analysis to perform real-time two-way coupling analysis. After the structural domain analysis, the structural deformation is transferred to the fluid domain, and the fluid domain The analysis transfers loads to domains. [0003] However, in the actual analysis process, when the real-time two-way coupling is performed, the fluid domain transfers the load to the structural domain. In the transient calculation of the structure, only the load transferred by the fluid is considered, and the influence of the additional mass g...

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Problems solved by technology

[0003] However, in the actual analysis process, when the real-time two-way coupling is performed, the fluid domain transfers the load to the structural domain. In the transient calculation of the structure, only the load transferred by the fluid is considered, and the influence of the additional mass generated by the fluid sloshing on the structure is not considered. In fact, the liquid will produce an additional mass on the surface of the structure during the sloshing process, which will change the dynamic characteristics of the structure, resulting in inaccurate structural deformation calculated by the structure, inaccurate displacement transmitted to the fluid domain, and final dynamic stress and The dynamic response is inconsistent with the actual situation, and it is impossible to accurately simulate the structural fatigue of the fuel tank due to liquid sloshing, which eventually leads to inaccurate calculated fatigue results

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