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A finite element modeling method for an automobile exhaust pipe silencer

A technology of automobile exhaust and modeling method, applied in instruments, special data processing applications, electrical digital data processing, etc., can solve the problems of destroying grid models, ignoring small features, not considering welds, etc., to achieve grid quality Improves, reduces mesh count, saves modeling time

Active Publication Date: 2017-09-15
CHANGZHOU INST OF LIGHT IND TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A finite element modeling method for an automobile exhaust pipe silencer
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  • A finite element modeling method for an automobile exhaust pipe silencer

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Embodiment Construction

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, rather than all embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work, all belong to the protection scope of the present invention .

[0030] A finite element modeling method of an automobile exhaust pipe muffler, the geometric model of the automobile exhaust pipe muffler is as follows figure 1 As shown, it may include: cylinder body 101, end cap 102, inner pipe 103, air inlet pipe 104, partition 105 and air outlet pipe 106, the air inlet pipe 104 and the cylinder body 101...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/23
Inventor 谢宝智
Owner CHANGZHOU INST OF LIGHT IND TECH
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