Challenge

Tool Test 1

DDhrumit Shah17 May 2020

*model-1:-

*name of tool tests:-

component

*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 requirement , but design 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 component.igs

(fig-1)

-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 & 3)

(fig-2)

(fig-3)

-for remove topological errors we use TOPO command and it select for all over geometry. if we TOPO command selected then full geometry is remove the geometrical error like two single cons(red line) are connected and convert to double cons(yellow line).

(fig-4)

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

the remove this error using auto fix command, if we use auto fix command then some time not remove error that time we remove this error use of manual .(note:- most of triple cons error are not remove and another error are removed)

(fig-5)

here we seen that model is symmentrical, then we create mid surface on one side surface and after that copy to another side, due to that we works on half surfaces only.

-for that we use to plane cut command and choose three nodes and create the plane. (TOPO>faces>plane cuts>single)

(fig-6)

-after that we seen the which portions are symmentric, for that we use to remove double command.(TOPO>faces>Rm.Dbl>geometry>mirror plane)

(fig-7)

-now we use to i-not command for remove faces, after that we lock the geometry and save for future references.

(fig-8)

2) generating mid surface:-

-manual mid surfacing for some surface use of offset command and some surface use of middle command.

offset:- TOPO>faces>offset

middle:- TOPO>faces>middle

there are two face available of any surface. the one side surface is negative value and another side of surface is positive value. for this reason ansa provided two color of surfaces:-

i)gray:-

if we choose gray face for offset then put negative value of half of the thickness.

ii)yellow:-

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

- after the create mid-surface of the model:-

(fig-9)

3)assigning relevant pid:-

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

-for that use topo>faces>set pid.

-after thas choose new pid opction and we provided name and thickness and provide another setting just like color editting and select ok button then create new pid.

(fig-10)

-after that we convert entities mode to pid mode then model show like fig-11

(fig-11)

4)meshing as per given criteria:-

first off all change perimeter length to 4 mm from the 1 mm, because our targeted length is 4 mm.

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

Number	Quality criteria	Value
1	Targeted/average length	4
2	Minimum length	2
3	Maximum length	6
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

(fig-12)
-we also value put in the mesh parameters.in mesh parameters there are three values are most important:-

1) target length(average)

2)minimum target length

3)maximum target length

(fig-13)

(fig-14)

-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.

if there are more triangular mesh available then we another opction choose like swap, joint, split(hybride opcion) and decrease the tringular mesh and then improvement of our result.

i)figure of after the meshing (shadow and entities mode):-

(fig-15)

ii) figure of after the meshing(hidden mode & entities mode):-

(fig-16)

-we create mesh on half part, due to the symentricity we coopy this part to other side then create meshing on overall model.

-for that we use to transform>copy command.

after that select entities and choose 3 nodes opction, then we create another side.

i)entities mode:-

(fig-17)

iii)pid mode:-

(fig-18)

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

(fig-19)

(fig-20)

*conclusion:-

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

*model:-2