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Subject: Re: [STRUC] MPCs on contacts with pilot node
Author: Riccardo Testi
Date: 2008-04-11 09:22:52

Brahmaji,
a few years ago, when I still used the Classic interface, I got into
trouble with the reaction solution in presence of constraint
equations. The solution was to resort to the OUTPR,RSOL,LAST command.
That way I could get the reaction solution output splitted in the
following sections:

***** REACTION SOLUTION ***** TIME = 1.0000
LOAD STEP= 1 SUBSTEP = 1 CUM. ITER.= 1

NOTE - ALL VECTOR DOFS ARE IN NODAL COORDINATE SYSTEMS.

NODE FX FY FZ MX
MY MZ
53 -3.43636 -80.3737 -43.3092 0.00000
0.00000 0.00000
59 -25.2836 123.114 85.3057 0.00000
0.00000 0.00000
837 0.00000 0.00000 0.00000 0.00000
0.00000 0.00000

TOTAL -28.7199 42.7400 41.9965 0.00000
0.00000 0.00000

....


***** CONSTRAINT EQN. REACTION SOLUTION ***** TIME = 1.0000
LOAD STEP= 1 SUBSTEP = 1 CUM. ITER.= 1

NOTE - ALL VECTOR DOFS ARE IN NODAL COORDINATE SYSTEMS.

NODE FX FY FZ MX
MY MZ
1 -2.92562 -1.15354 4.28012
2 4.14775 -1.15354 9.78011
3 -1.74673 -1.15354 5.19678
4 -0.567833 -1.15354 6.11345
5 0.611063 -1.15354 7.03011
6 1.78996 -1.15354 7.94678
7 2.96885 -1.15354 8.86344
8 -2.92562 3.56204 -11.4733
...

Summing the values of the two sections, I could get the correct total value.
Maybe you're now missing the "Constraint eqn. reaction solution" section.

Best regards
---
Riccardo Testi
POWERTRAIN and ENGINEERING
ENGINE DESIGN and CALCULATIONS
Piaggio & C. S.p.A
Viale Rinaldo Piaggio, 25
56025 Pontedera (Pisa) - ITALY
' Phone: +39 0587 272324
7 Fax: +39 0587 272010
* E-mail: riccardo.testi_at_piaggio.com





At 19.39 10/04/2008, you wrote:
>Ansys Experts,
>
>
>
>I have noticed when using the MPC option (force distributed constraint and
>rigid surface constraint) on contacts with pilot node, I do not get any
>reaction moments when I list reaction solution even when I apply a moment on
>the pilot node. I have also replicated the example problem given in Ansys
>help file Section 9.3, Figure 9.10 (version 11) and noticed that the
>reaction moments were zero, yet I still get the appropriate stress values
>for the applied moment.
>
>
>
>Has anyone of you noticed this, is this how it is supposed to be?
>
>
>
>Regards,
>
>Brahmaji
>
>
>
>Rolls-Royce Energy Systems
>
>PT Design - Mechanical Engineer
>
>Mount Vernon, OH
>
>
>
>
>
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Posts possibly associated with message #92807AuthorDateScore
92794[STRUC] MPCs on contacts with pilot nodebrahmaji.vasantharao_at_rolls-royce.com2008/04/10 
92795Re: [STRUC] MPCs on contacts with pilot nodeCharles Bhaskaran2008/04/10 
92799Re: [STRUC] MPCs on contacts with pilot nodeKrishna Raichur 2008/04/10 
92800Re: [STRUC] MPCs on contacts with pilot nodebrahmaji.vasantharao_at_rolls-royce.com2008/04/10 
92806Re: [STRUC] MPCs on contacts with pilot nodeArne Löhn2008/04/11 
92807Re: [STRUC] MPCs on contacts with pilot nodeRiccardo Testi2008/04/11 
92818Re: [STRUC] MPCs on contacts with pilot nodeKrishna Raichur 2008/04/11 
92824Re: [STRUC] MPCs on contacts with pilot nodebrahmaji.vasantharao_at_rolls-royce.com2008/04/11 
92826Re: [STRUC] MPCs on contacts with pilot nodeKrishna Raichur 2008/04/11 
92827Re: [STRUC] MPCs on contacts with pilot nodeChristopher Wright2008/04/12