Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint
With the recent advances computing technologies nowadays, reverse engineering is rapidly developing and has been strongly established many years in biomedical industry. Three dimensional geometric modeling is now being extensively used in many applications such as surgical planning, rapid protot...
| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2018
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| Online Access: | http://psasir.upm.edu.my/id/eprint/114737/1/114737.pdf |
| _version_ | 1824452461453115392 |
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| author | Leong, Mun Teik |
| author_facet | Leong, Mun Teik |
| author_sort | Leong, Mun Teik |
| collection | UPM |
| description | With the recent advances computing technologies nowadays, reverse
engineering is rapidly developing and has been strongly established many years
in biomedical industry. Three dimensional geometric modeling is now being
extensively used in many applications such as surgical planning, rapid
prototyping, medical implants design, numerical simulation and etc. Thus, mesh
quality is very crucial especially in finite element analysis in order to produce high
accuracy results. Re-triangulation surface method is employed to improve the
mesh quality of the model with certain parameters. The purpose of this study are
a) to construct a complex three dimensional geometric CAD model of human
wrist joint which contains cortical and cancellous bones using image-based
processing method, b) to investigate the effects of triangle reduction, mesh
smoothing and size of triangle mesh on the accuracy and mesh quality of the
wrist bones model and c) to optimize the mesh quality using response surface
methodology (RSM). A three dimensional CAD model of a human wrist joint was
constructed after conversion model to non-uniform rational B-spline (NURBS).
Re-triangulation process was carried out by manipulating different values of the
parameters like geometrical error, smoothing factor and control edge length of
triangle mesh along with mesh quality analysis in order to get high quality of
mesh on the triangular surface wrist joint model. Lastly, optimization was
performed via RSM to optimize the high quality mesh on the triangular surface
model. In the findings, triangle reduction with geometrical error of 0.05 mm had
reduced the number of triangles of cortical and cancellous bones to 74.81 % and
75.34 % respectively while obtained 70.05 % and 68.69 % of high quality of mesh
on the surface model respectively. In term of accuracy, no significant changed in
surface area and volume. For mesh smoothing effect, smoothing factor of 0.8
was selected to obtain 87.53 % and 86.68 % of high quality of mesh on cortical
and cancellous bones respectively. For control size of triangle mesh, 0.5 mm of
control edge length of triangle was taken to produce 92.35 % and 92.09 % for
cortical and cancellous bones respectively. In term of accuracy of the model, the
surface area and volume of the cortical and cancellous bones had no significant
changed with less than 0.15 % and 0.25 % compared to the initial bones model.
In RSM optimization, the optimum mesh quality on cortical and cancellous bones
were 90.74 % and 89.67 % respectively. In conclusions, the mesh quality and
accuracy of the model show promising results with the process of re-triangulation
surface and the high quality mesh of optimum models were obtained using RSM. |
| first_indexed | 2025-02-19T02:50:53Z |
| format | Thesis |
| id | upm.eprints-114737 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2025-02-19T02:50:53Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | upm.eprints-1147372025-01-28T01:57:29Z http://psasir.upm.edu.my/id/eprint/114737/ Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint Leong, Mun Teik With the recent advances computing technologies nowadays, reverse engineering is rapidly developing and has been strongly established many years in biomedical industry. Three dimensional geometric modeling is now being extensively used in many applications such as surgical planning, rapid prototyping, medical implants design, numerical simulation and etc. Thus, mesh quality is very crucial especially in finite element analysis in order to produce high accuracy results. Re-triangulation surface method is employed to improve the mesh quality of the model with certain parameters. The purpose of this study are a) to construct a complex three dimensional geometric CAD model of human wrist joint which contains cortical and cancellous bones using image-based processing method, b) to investigate the effects of triangle reduction, mesh smoothing and size of triangle mesh on the accuracy and mesh quality of the wrist bones model and c) to optimize the mesh quality using response surface methodology (RSM). A three dimensional CAD model of a human wrist joint was constructed after conversion model to non-uniform rational B-spline (NURBS). Re-triangulation process was carried out by manipulating different values of the parameters like geometrical error, smoothing factor and control edge length of triangle mesh along with mesh quality analysis in order to get high quality of mesh on the triangular surface wrist joint model. Lastly, optimization was performed via RSM to optimize the high quality mesh on the triangular surface model. In the findings, triangle reduction with geometrical error of 0.05 mm had reduced the number of triangles of cortical and cancellous bones to 74.81 % and 75.34 % respectively while obtained 70.05 % and 68.69 % of high quality of mesh on the surface model respectively. In term of accuracy, no significant changed in surface area and volume. For mesh smoothing effect, smoothing factor of 0.8 was selected to obtain 87.53 % and 86.68 % of high quality of mesh on cortical and cancellous bones respectively. For control size of triangle mesh, 0.5 mm of control edge length of triangle was taken to produce 92.35 % and 92.09 % for cortical and cancellous bones respectively. In term of accuracy of the model, the surface area and volume of the cortical and cancellous bones had no significant changed with less than 0.15 % and 0.25 % compared to the initial bones model. In RSM optimization, the optimum mesh quality on cortical and cancellous bones were 90.74 % and 89.67 % respectively. In conclusions, the mesh quality and accuracy of the model show promising results with the process of re-triangulation surface and the high quality mesh of optimum models were obtained using RSM. 2018-11 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/114737/1/114737.pdf Leong, Mun Teik (2018) Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint. Masters thesis, Universiti Putra Malaysia. http://ethesis.upm.edu.my/id/eprint/18178 Biomedical engineering |
| spellingShingle | Biomedical engineering Leong, Mun Teik Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint |
| title | Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint |
| title_full | Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint |
| title_fullStr | Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint |
| title_full_unstemmed | Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint |
| title_short | Mesh quality improvement by re-triangulation surface meshes on 3-dimensional CAD model of a human wrist joint |
| title_sort | mesh quality improvement by re triangulation surface meshes on 3 dimensional cad model of a human wrist joint |
| topic | Biomedical engineering |
| url | http://psasir.upm.edu.my/id/eprint/114737/1/114737.pdf |
| work_keys_str_mv | AT leongmunteik meshqualityimprovementbyretriangulationsurfacemesheson3dimensionalcadmodelofahumanwristjoint |