Finite element analysis method and system for installation strength of rail transit air conditioner rack

Abstract

According to the finite element analysis method and system for the installation strength of the rail transit air conditioner frame, a cavity is generated by simulating a mass-concentrated system component shell unit in an air conditioner, meanwhile, internal components are simplified into single mass units, and rigid connection between the cavity and the mass units is established, so that an FEM model of the system component is obtained; according to the actual situation, the FEM model of the corresponding system component is edited, and after the beam unit is installed on the air conditioner base and assembled with the FEM model of the air conditioner frame, simulation analysis can be carried out. By means of the method, the precision of the analysis result is guaranteed, and the efficiency of simulation analysis is improved.

Description

technical field [0001] The invention relates to the field of rail transit air conditioners, in particular to a finite element analysis method and system for the installation strength of rail transit air conditioner racks. Background technique [0002] Rail transit air conditioners include many large lumped mass components such as compressors, heat exchangers, and fans. These components are collectively referred to as system components, and they are all installed in the air conditioning cavity. The internal large-mass components are modeled by finite element, and the air-conditioning rack is used as the main object of structural simulation analysis to study its bearing capacity for large-mass components under external vibration conditions. The finite element modeling of it according to the real structure is generally simplified as a single mass unit connected to the air conditioner installation base. Although this method is the fastest, it has a certain impact on the accuracy...

AI Technical Summary

Problems solved by technology

[0002] Rail transit air conditioners include many large lumped mass components such as compressors, heat exchangers, and fans. These components are collectively referred to as system components, and they are all installed in the air conditioning cavity. The internal large-mass components are modeled by finite element, and the air-conditioning rack is used as the main object of structural simulation analysis to study its bearing capacity for large-mass components under external vibration conditions. The finite element modeling of it according to the real structure is generally simplified as a single mass unit connected to the air conditioner installation base. Although this method is the fastest, it has a certain impact on the accuracy of the simulation analysis results of the strength of the rack installation structure. , if the simplified component mass unit is connected to the installation base with RBE2 (pure rigidity), the analyzed installation structure strength results are too aggressive; when the simplified component mass unit is connected to the installation base with RBE3 (flexible), the analyzed installation structure The strength results are too conservative and the reason for this difference is that the simplified system components are not purely rigid

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