EXTRACTING MIDSURFACE AND MESHING FOR THE HOOD COMPONENT USING ANSA

OBJECTIVE: For the given component, check for the geometrical errors and mesh with the given element Quality criteria. After meshing the component the thickness has to be assigned.

QUALITY CRITERIA GIVEN:

S.No	Quality Criteria	Value
1	Target/Average length	5
2	Minimum Length	2
3	Maximum Length	7
4	Aspect	3
5	Warpage	15
6	Skewness	45
7	Jacobian	0.7
8	Minimum Quad Angle	45
9	Maximum Quad Angle	135
10	Minimum Tria Angle	30
11	Maximum Tria Angle	120
10	Tria Percentage	15

PROCEDURE:

• IMPORT THE GIVEN HOOD COMPONENT

• CHECK FOR GEOMETRY

• EXTRACT THE MIDSURFACE

• MESH

• CLEANUP THE QUALITY CRITERIA

• ASSIGN THE THICKNESS

STEP1: IMPORT THE GIVEN HOOD COMPONENT

COMMAND: FILE-OPEN-CHOOSE FILE FOLDER (CTRL+O)

FIG1.1 GIVEN HOOD COMPONENT

After importing the model we should set proper PID's and delete the unwanted PID's, here we have Five different components so we can set PID's for each components. which are,

• INNER BODY EXTRACT
• OUTER BODY EXTRACT
• LATCH
• HINGE 1
• HINGE 2

STEP2: CHECK FOR GEOMETRY

After importing the geometry we should check for geometry issues

COMMAND: CHECKS-GEOMETRY-EXECUTE

FIG 2.1 CHECKING GEOMETRY BEFORE CLEAN UP CHECKS

FIG 2.2 CHECKING GEOMETRY AFTER CLEANUP CHECKS

fix the issues using auto fix or we can fix it manually, fix all the issues until it reaches zero and status in green.

FIG 2.3 BEFORE CLEANUP GEOMETRY OUTER BODY, LATCH, HINGE

FIG 2.3 AFTER CLEANUP GEOMETRY OUTER BODY, LATCH , HINGE

STEP 3: EXTRACT MIDSURFACE

Before extracting the midsurface we shold measure the dimensions for each and every components for different directions.

FIG3.1 MEASUREMENT ON LATCH (1.2)

FIG3.2 MEASUREMENT ON HINGE(1.2)

FIG3.3 MEASUREMENT ON INNER BODY EXTRACT(0.75)

here the Latch, Hinge1, Hinge2 are having 1.2 and outer and inner extract body having 0.75 thickness.

we can use the offset option to take the midsurface because of the complex geometry.

COMMAND: ON TOPO--FACES--OFFET-GIVE HALF OF THE THICKENESS OF THE MEASURED THICKNESS

FIG3.4 MIDSURFACE ON LATCH, HINGE1, HINGE2

FIG3.5 MIDSURFACE ON INNER BODY EXTRACT

FIG3.6 MIDSURFACE ON OUTER BODY EXTRACT

STEP4: MESHING

Before going to mesh we need to fix the lengths for the component. And also need to apply the quality criteria for the mesh

FIG 4.1 QUALITY CRITERIA

COMMAND: MESH--MESH GENERATION-- BEST

COMMAND: MESH--SHELL MESH-- RECONSTRUCT

FIG4.2 MESH ON LATCH

STEP5: QUALITY CRITERIA

To clean up the quality we can use ELEMENTS option ie., split, join, swap etc and also smooth. by reconstructing the mesh we will acheive the good quality mesh.

STEP6 : ASSIGNING THICKNESS:

we have to assign the material card as well as thickness for every components.

FIG6.1 ASSIGNING MATERIAL CARD

FIG6.2 ASSIGNING THICKNESS

To see the thickness we assigned.

COMMAND: PROPERTIES- PRESENTATION PARAMETER- CHECK - SHELL AS SOLIDS

CONCLUSION:

By the following procedure the component has been meshed with no off elements with proper flow.

MESH ON OUTER BODY, HINGES AND LATCH

FINAL MESHED COMPONENTS

LEARNING OUTCOMES:

Lean how to extract the midsurface.

In this method we learn how to mesh with proper flow.

And cleanup the quality criteria.

And assigining the thickess for the component.

DRIVE LINK

https://drive.google.com/file/d/1twURHVKcq7-26mW0FT_kp8xu7lzlyuE8/view?usp=sharing