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Tutorial 7: Introduction to airbag folding

Case description:

Part I: Thin fold

Part II: Tuck fold / Thick fold

Part III: Thin fold / Spiral fold

Files required:

airbag coarse.zip,airbag_fine.zip

Step 1: Open coarse mesh airbag model

1.  File →  Open →  LS-Dyna Keyword File

2. 

open airbag_coarse.k

3. 

click Bottom render button

4. 

FEM→Model and Part→Assembly and Select Part

5.  select "4 rigid inflator can" from the list

6. 

click Rev

7. 

click Done

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Step 2: Identify fold defining nodes

1. 

FEM→element Tools→Identify

2.  click Top render button

3. 

click +10 render button (changes to -10)

4. 

click Rx render button 3 times

5. 

enter Key in ID=1:30

6.  press Enter on keyboard

7.  click Done

Step 3: Create Thin fold definition #1

1. 

Application→Airbag Folding

2.  for N1, pick node ID 1 from graphics window

3.  for N2, pick node ID 2 from graphics window

4.  for Active, pick node ID 3 from graphics window

5. 

select Up

6. 

click Apply

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Step 4:Create Thin fold definitions #2-9

1. 

N1=4, N2=5, Active=6, select Down

2. 

click Apply

3.  N1=7, N2=8, Active=9, select Up

4.  click Apply

5. 

N1=10, N2=11, Active=12, select Up

6. 

click Apply

7.  N1=13, N2=14, Active=15, select Down

8.  click Apply

9.  N1=16, N2=17, Active=18, select Up

10. 

click Apply

11. 

N1=19, N2=20, Active=21, select Down12.  click Apply

13.  N1=22, N2=23, Active=24, select Up

14. 

click Apply

15. 

N1=25, N2=26, Active=27, select Down

16. 

click Apply

17.  N1=28, N2=29, Active=30, select Up

18.  activate Ignore

19.  click Apply

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Step 5:Preview folds, accept, and save model

1. 

click Step 10 times

2. 

click Reset

3. 

click Fold

4.  click Back render button

5.  File →  Save Keyword

6. 

enter Filename: thinfolded.k

7. 

click Save

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Step 6 :Open original model

1.  File →  Exit

2.  Open new session of LS-PrePost

3.  File →  Open →  LS-Dyna Keyword File

4. 

open airbag_coarse.k

5. 

FEM→Model and Part→Assembly and Select Part

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6.  select "4 rigid inflator can" from the list

7. 

click Rev

8. 

FEM→Element Tools→Identify

9.  enter Key in ID=1:3,10:12,22:24,28:30

10.  press Enter on keyboard

11.  click +10 render button

12. 

click Rx render button 5 times

Step 7: Create Tuck fold definitions #1 and #2

1.  Application→Airbag Folding

2. 

select Fold Type: Tuck fold

3. 

N1=1, N2=2, Active=3

4.  click Apply

5.  N1=10, N2=11, Active=12

6.  click Apply

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Step 8:Create Thick fold definitions #3 and #4

1. 

select Fold Type: Thick fold

2. 

N1=22, N2=23, Active=24

3. 

click Apply

4.  N1=28, N2=29, Active=30

5.  click Apply

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Step 9:Perform folding and save model

1.  click Step 4 times

2.  click Back render button

3. 

click Clear All render button

4.  File →  Save Keyword

5. 

enter Filename: tuck_thick.k

6.  click Save

Step 10:Open fine mesh airbag model

1. 

File →  Exit

2.  Open new session of LS-PrePost

3.  File →  Open →  LS-Dyna Keyword File

4. 

open airbag_fine.k

5. 

FEM→Model and Part→Assembly and Select Part

6. 

select "4 rigid inflator can" from the list

7.  click Rev

8.  FEM→Element Tools→Identify

9.  enter Key in ID=1:18,9400,8548,9403,7487,6621,7490

10. 

press Enter on keyboard

11. 

click +10 render button12.  click Rx render button 3 times

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Step 11:Create Thin fold definition #1-6

1. 

Application→Seatbelt Fitting

2. 

N1=1, N2=2, Active=3, select Up

3.  click Apply

4.  N1=4, N2=5, Active=6, select Down

5.  click Apply

6. 

N1=7, N2=8, Active=9, select Up

7. 

click Apply

8. 

N1=10, N2=11, Active=12, select Up

9.  click Apply

10.  N1=13, N2=14, Active=15, select Down

11. 

click Apply

12. 

N1=16, N2=17, Active=18, select Up

13.  click Apply

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Step 12: Create Spiral fold definitions #7 and #8

1. 

select Fold Type: Spiral fold

2. 

N1=9400, N2=8548, Active=9403, select Up

3.  enter Radius=40

4.  click Apply

5. 

N1=7487, N2=6621, Active=7490, select Up

6. 

click Apply

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Step 13: Perform folding and save model

1.  click Step 8 times

2. 

click Clear All render button

3. 

click Back render button

4. 

File →  Save Keyword

5.  enter Filename: spiral.k

6.  click Save

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