A finite element modeling method for an automobile exhaust pipe silencer

Abstract

The invention provides a finite element modeling method for an automobile exhaust pipe silencer. The method comprises the steps of performing finite element modeling on a turnup portion of a drum body, turnup portions at the drum body and an end cover, an air intake pipe, an intake pipe, a separating plate, an exit pipe, an end cover, a welding portion of the air intake pipe and the drum body, a welding portion of the exit pipe and the end cover, a welding portion of the inner pipe and the separating plate, a welding portion of the drum body and the separating plate and the drum body and obtaining corresponding grids; creating materials and attributes for the grids and assigning the created materials and attributes to the corresponding grids; finally adding mass points, building rigid units and performing mass correction on a whole automobile exhaust pipe silencer. The method has the advantages of accurate modeling, fewer grids, higher grid quality and easy implementation and is suitable for the field of computer-aided engineering.

Description

technical field [0001] The invention belongs to the technical field of computer-aided engineering, and in particular relates to a finite element modeling method of an automobile exhaust pipe muffler. Background technique [0002] Automobile exhaust pipe mufflers are mainly made of thin sheets and are used to reduce vehicle noise. Under the action of mechanical vibration, airflow impact and heat, in order to achieve its acoustic characteristics and aerodynamic requirements, the muffler must have a good structural design (including materials) to meet certain strength, stiffness and dynamics (modal, response spectral analysis, etc.) requirements. The traditional muffler structure design mainly adopts the method of combining the designer's experience and a large number of experiments, which takes a long time and high cost. With the continuous development of computer hardware and the increasing maturity of software applications, computer simulation methods can be used to study ...

AI Technical Summary

Problems solved by technology

[0005] However, in the above two methods: (1) no specific implementation steps and methods are disclosed; (2) the weld seam is not considered, but ignoring the weld seam will not be able to analyze the stress of the weld seam itself and its surroundings, and cause a large The mass error and mass distribution error cannot truly reflect the static and dynamic performance of the muffler under the action of vibration, airflow impact and heat; (3) For the treatment of flanging, although it is slightly mentioned in Document 2, but The method of ignoring at the beginning and supplementing at the end will destroy the existing mesh model and increase the difficulty of modeling; (4) Because the model ignores small features and welds, it will inevitably lead to differences in total mass, which will affect the accuracy of calculation results Large, both methods do not take into account the quality of the correction

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