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Torsion Spring +Pin Joint

Altair Forum User

Hallo Guys,

i want to define a Pin-Joint with Torsion Spring (See the foto)

at first: two bar are connected with pin joint.

second: later add a Torsion Spring to this pin joint.

Programming in Hw:

for Pin Joint

Bar A: pins a : 0 , pins b: 456

Bar B: pins a : 0 , pins b: 0

for torsion spring

SPC: Dof4 : 400000 (NM)

But this simulation runs wrong!!

how can i define right pin joint with torsion spring for two bars????

Best Regards!

Leslie

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tinh

Hi there,

Could you show a screenshoot with global system and local systems?

what kind of wrong simulation? it is error or result is wrong?

If your case is planar then only pin dof 6 (assume screen normal is z axis)

for torsion spring you can use elas1 with C#6

anyway i tested it successfully running:

/emoticons/default_wink.png' alt=';)' srcset='/emoticons/wink@2x.png 2x' width='20' height='20'>

SUBCASE 1

LABEL test

ANALYSIS STATICS

SPC = 1

LOAD = 2

BEGIN BULK

GRID 1 0.0 0.0 0.0

GRID 2 500.0 500.0 0.0

GRID 3 0.0 500.0 0.0

CELAS1 3 2 3 6

CBEAM 1 1 1 31.0 0.0 0.0

+ 6

CBEAM 2 1 3 20.0 -1.0 0.0

PBEAML 1 1 ROD +

+ 50.0 0.0

PELAS 24.0+8 0.0 0.0

MAT1 1210000.0 0.3 7.9-9

SPC 1 1 1234560.0

FORCE 2 2 01.0 0.0 -15000.00.0

ENDDATA

Altair Forum User

tinh

thanks for your help!

Can u tell me, how do u define the pin Joint between 2 bars, donot use pins a/b???

how do u define the Torstion Spring between 2 bars, use elas1 ???

i use HW-Panel, not code!

Altair Forum User

tinh

at first: two bar are connect with pin joint.

second: later add a Torsion Spring to this pin joint !!

i hope, u understanding what i mean!

tinh

tinh

at first: two bar are connect with pin joint.

second: later add a Torsion Spring to this pin joint !!

i hope, u understanding what i mean!

Yes I use hm panel, and the codes i send you is exported deck

1) create 3 nodes: 1- (0,0,0) , 2-(0,500,0), 3-(500,500,0)

2) create bar1: nodeA - 1, pin 0

nodeB - 2, pin 6

3) create bar2: nodeA- 2, pin 0

nodeB -3, pin 0

4) make material, PBEAML assign section size

5) make a PELAS, assign K

6) make a CELAS1 (use panel 1D>masses, switch elems type to CELAS1), pick node 2, property PELAS

7) edit card the CELAS1 elems, set C=6

8) assign load, spc, loadstep and run

Have a good job!

tinh

And if you let pin 456 then you should set C=456. but in your case there is no moment around y nor x, so need #6 only

Do you understand CELAS1 card? - read reference help optistruct first

Altair Forum User

tinh

Thanks for your help, but i donot know, how to do step 7 in hw (edit card the CELAS1 )?

7) edit card the CELAS1 elems, set C=6

tinh

Hi Leslie

did you see 'card edit' button on the toolbar? There it is /emoticons/default_smile.png' alt=':)' srcset='<fileStore.core_Emoticons>/emoticons/smile@2x.png 2x' width='20' height='20'>

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

tinh thanks very much,

if i want to define 3 Torsion Spring (x,y,z) for the same Node, i donot think, this way is useful /emoticons/default_happy.png' alt='^_^' srcset='/emoticons/happy@2x.png 2x' width='20' height='20'>

tinh

tinh thanks very much,

if i want to define 3 Torsion Spring (x,y,z) for the same Node, i donot think, this way is useful /emoticons/default_happy.png' alt='^_^' srcset='/emoticons/happy@2x.png 2x' width='20' height='20'>

Sorry Leslie,

I tell you that using mass panel to create celas1 but this is ground spring, so it may not suitable with your case

could you try again with this way:

- make 2 cbeams but not connect together

- make a celas1 by spring panel that connect 2 ends of 2 cbeams

- f3> uncheck 'equivalence' then stick 2 nodes of spring together

and also i miss that cannot set 3 dofs for this spring

/emoticons/default_sad.png' alt=':(' srcset='/emoticons/sad@2x.png 2x' width='20' height='20'>

perhaps, you can make 3 celas

tinh

ah, you can use cbush for 3-dof spring because PBUSH has 6 stiffness

never need to make 3 celas /emoticons/default_laugh.png' alt=''>