unpredicted joint force behaviour

dkakth · Nov 8, 2015

Hello !

I have modeled a completely symmetric lift table (

), but when i simulate, I have interesting situation where there are joint forces only on the joints which are on left side of table (A, B, C and D) (

), whereas corresponding joints on the other side deliver zero. what causes this strange behavior ? I am attaching the *.cmd file if you wish to have an eye upon...

greetings

GregLocock · Nov 9, 2015

I suspect that if you check the run time messages from the solver it says something like 'Read this carefully. Over constrained joints in model. The following degrees of freedom have been released...'

Cheers

Greg Locock

New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

dkakth · Nov 9, 2015

indeed, but how can i have forces on each joint then

p.s. sorry - im new to MBD analysis...

GregLocock · Nov 9, 2015

You need a better model. How does a real structure equalise the forces across a nominally symmetrical mechanism?

Incidentally who is mentoring/teaching you on MBD?

Cheers

Greg Locock

New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

dkakth · Nov 13, 2015

Im self - educating

Reading some books and thats all - if you can guide me to good videotutorials / books i will be grateful !!!

dkakth · Nov 14, 2015

...and once again - i want to monitor joint forces on both sides - if i add one more joint, im overconstrainting it - what should i do ?!

Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

unpredicted joint force behaviour

dkakth

Mechanical

GregLocock

Automotive

dkakth

Mechanical

GregLocock

Automotive

dkakth

Mechanical

dkakth

Mechanical

Similar threads

Part and Inventory Search

Sponsor