Need Help in ADAMS/View

[lakis1982]

Hello mates.. I really have a problem. I am using ADAMS/View 2010 an d I try to set a simple four cylinder (4 stroke) engine to run. My problem is the following.

-I have put a small torque that applies for one second on the crankshaft ( like the starter does) and then goes away. So the initial turn of the crankshaft is performed. SO far so good.

- Then i need to set the piston force on each of the four pistons. For this I have created a data curve, that show the actual force a piston receives with respect to the crankshaft position. So for example the maximum piston force the piston receives is about at 360 degrees of the crankshaft ( the 4 stroke engine completes its cycle in 720 degrees). In other words I want to apply the piston force according to the data curve diagram and this should apply on the piston every 720 degrees of the crankshaft. How can I do this??


Any help would be really appreciated

Thanks

 

[GregLocock]

Your solution will involve the keywords SFORCE and AKISPL

Cheers

Greg Locock


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

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

 

[lakis1982]

This is what I tried to do, but how can i input to the AKISPL statement to have independent variable the crankshaft angle and not the time. I tried the AZ command that counts the angle but this function goes from -pi to pi . But I want this to happen and repetaed every 720 degres ( 4 pi) . DO you know anything?

Thanks

 

[GregLocock]

I'll generously assume that you are not used to writing english, that last phrase is extremely insolent.

Yes that is an interesting problem. A quick and dirty solution would be to build a camshaft, driven by a 2:1 gear ratio off the crankshaft, and use the angle of that to drive the AKISPL function.

There must be a more elegant solution, it eludes me at the moment.




Cheers

Greg Locock


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

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

 

[lakis1982]

Indeed I am not english. Sorry for my english. If you can find out a solution for this problem I would really appreciate it if you could share it with me..

THank you