Method for constructing simulation model of converter cabinet body vibration

Abstract

The invention discloses a method for constructing a simulation model of converter cabinet body vibration. The method includes the steps that 1, a finite element model of a converter cabinet body is constructed; 2, the simulation modality of the finite element model is calculated, the test modality of the converter cabinet body is introduced, whether the consistency of the simulation modality and the test modality meets a preset first consistency standard is verified, if yes, step 3 is carried out, and if not, parameters of the finite element model are amended, and the step 2 is repeated; 3, the actual response data of an actual test is used as the input of the finite element model, and the load of an exciting point is calculated; 4, the load of the exciting point is used as the input of the finite element model, and the simulation response output of a response point is calculated; 5, whether the consistency between the actual response data and the simulation response output meets a preset second consistency standard is verified, if yes, construction of the simulation model is completed, and if not, the rigidity parameter of the finite element model is amended, and the step 4 is carried out. The method has the advantages that the accuracy of simulation results obtained by the simulation model and high simulation precision are ensured.

Description

technical field [0001] The invention relates to the technical field of vibration simulation, in particular to a method for constructing a vibration simulation model of a converter cabinet used in rail traffic such as trains. Background technique [0002] Converters for rail transit vehicles can be divided into traction converters and auxiliary converters, which are important equipment for the normal operation of rail transit vehicles. From the perspective of functional structure, these converters can basically be divided into cabinets and electrical components (such as converter modules, control boxes, transformers, reactors, fans, contactors, busbars and wires, etc.). Electromagnetic components such as transformers and reactors will generate large electromagnetic vibrations due to the magnetostrictive effect during work; fans will generate large mechanical vibrations due to large power, high speed, and large wind pressure and flow; contact The device will generate a large ...

AI Technical Summary

Problems solved by technology

However, the vibration problem involves multi-disciplinary and multi-physical fields, which is quite complicated. The current simulation analysis has the following problems: 1) There is no complete analysis process

Most of the literature focuses on a certain aspect of the vibration problem, and seldom makes a reasonable combination of the converter finite element model correction and load identification

2) The simulation accuracy is not high

Because the finite element calculation requires some simplification of the system, for example, some nonlinear parameters become linear parameters, so that the finite element calculation model does not fully represent the real physical model, so that the finite element calculation results have some deviations from the real results

Modal analysis is the basis of various dynamic analysis types. Many calculation results are obtained based on modal superposition. Most of the existing simulation models do not consider the comparison and sensitivity analysis between the simulation mode and the test mode. As a result, the input of the simulation model is biased, and the errors are continuously accumulated in the subsequent links, which eventually leads to low simulation accuracy, which makes the usability of the simulation results worse, and does not give full play to the guidance value that the simulation model should have.

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