Extracting manual mid surface and meshing of the hood model using ANSA software

*name of tool tests:-

HOOD model

*objectives:-

To remove all topological errors, creating the mid surface and meshing the component with given quality criteria.

*methodology:-

1)geometry cleanup

2)generating mid surface

3)assigning relevant pid

4)meshing as per given criteria

1) geometry cleanup:-

-first of all model created by design engineer based on requrement but that engineer is not understand about this model is good or bed then ansa software required for the check the quality criteria.

-for that first of all import a file of bottle hood_model.igs

-after that change the perimeter length to 1 mm. this opction is available at mesh>perimeters>length

this change is required for better(fine) geometry.(seen different between fig 1 & 2)

-for remove topological errors we use topo opction and it select for all over geometry.

-for remove errors like triple cons, single cons, cracked faces, needle faces using the geometry. this opction available at tools>checks>geometry

(note:- the remove this error manually , otherwise using autofix opction(this works for some errors another errors remove manually)

2) generating mid surface:-

-before going to midsurface generation check for symentry of geometry. for that we use faces>Rm.dbl>geometry>symmenty command under topo.

remove the one side of the component using i-not command and after that locks a geometry and its save for future references.

-manual mid surfacing using faces>offset opction.

here, sheet metal component available and thickness of a component is constant every where(0.75 mm). here two colors types faces are availbale

1)gray.

2) yellow.

1)if we choose gray face for offset then put negative value of half the thickness(-0.375).

2)if we choose yellow face for offset then put positive value of half the thickness(0.375).

3)assigning relevant pid:-

after the mid surfacing we create new pid of mid surface.

for that use topo>faces>set pid.

4)meshing as per given criteria:-

first off all change perimeter length to 5 mm from the 1 mm, because our targeted length is 5 mm.

put different value of quality criateria available is under.for open quality criteria window use f11 key.

Number	Quality criteria	Value
1	Targeted/average length	5
2	Minimum length	3
3	Maximum length	7
4	Aspect ratio	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
12	Tria percentage	15

-use the best mesh command for the entire part(mesh>mesh generation>best). we seperate the components in to several parts for best results .

after that use reconstruct, smooth to achieve proper mesh flow.

-utilities>transform>symentrical is used to copy the mesh about symmentrical axis.

-under quality criteria>presentation parameters tab select draw shell as solid check box to view thickness.

*conclusion:-

this model is cleaned for geometrical errors and mesh to satisfy the given quality criteria.