Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Methodology for obtaining 3D CAD models from complex objects through digitization and numerical adjustment: heat exchanger plates
Submission Author:
Bruna Larissa Tascheck , SC
Co-Authors:
Bruna Larissa Tascheck, Talita Possamai, Sueli Fischer Beckert, Damylle Donati, Renato Oba, Rodrigo Santiago
Presenter: Bruna Larissa Tascheck
doi://10.26678/ABCM.COBEM2023.COB2023-0408
Abstract
Digitizing is an applied approach to obtaining complex geometries, especially for surfaces that have free shapes. This is a non-contact, non-destructive technique that generates a cloud of points in a coordinate system that accurately describes the size and shape of the physical object. However, for some more complex geometries, the result obtained through three-dimensional scanning is not yet suitable for some applications such as numerical simulation. In this study, a three-dimensional (3D) scanner was used to obtain the CAD model of the plate of a gasketed plate heat exchanger (GPHE). The analyzed plates have a thickness of 0.7 mm and their handling promotes distortions in the piece and deformations that are undesirable for further analysis. In this way, a numerical simulation applying the finite element method (FEM) was performed after the generation of the geometry through scanning to promote alignment of the geometry, thus correcting the deformations present in the physical part that was captured by the scanner. As a result of the numerical treatment, the geometry that had a deformation of 2.43 mm at its maximum point, in relation to a flat reference surface, now presents a uniform height, reducing this distance to approximately zero. The interaction between the contact points of the auxiliary flat surfaces for the alignment of the geometry and the plate, caused a maximum penetration of 0.22 mm, thus resulting in a variation of ±7.5% in the standard height of the plate, which is 3.2 mm. The scanning methodology, the treatment of the point cloud resulting from the scanning and the geometry alignment applying FEM are described in this article. The CAD model obtained from the heat exchanger plate shows that numerical simulation can help in obtaining a computational domain that is representative of the real object and suitable for future analysis in several applications.
Keywords
CAD, Numerical simulation, FEM, Scanner 3D
