Conrod Stress Recovery

Model of 6-cylinder 4-stroke boxer engine simulated by MSC.Adams developed as a part of master thesis.

Category:

Science & Technology

Tags:

• mechanics
• multi
• body
• system
• simulation
• conrod
• engine
• MSC.Adams

[bargd73]

that is confusing. It is showing 3 pairs at what looks like a 6 cyl firing degrees(120)...and each pair is 180 apart. A 6 cyl fires every 120 degrees for a four stroke, how is a flat six with 180 degree pairs of cylinders, in a flat block firable in the above animation? Doesn't it need a 120 degree block to be 180 pairs.I tried to draw one flat out, and could not do the 180 pair thing you got going in animation for a 6 cyl. A gour cyl boxer is in heaven there at 180 degree fires. I confuse me.

[JanSotnik]

Hi,

the firing sequence is : 1 - 6 - 2 - 4 - 3 - 5, while 1 , 2 , 3 is on the left bank (view on animation) and 3 , 4 , 6 is on right bank going from free end to the flywheel.

Sorry I do not recall all I did but essentially the concept comes from Porsche engines.

Feel free to ask if you have any questions.

[ktysai]

What CAD programm have you used for the parts?

[JanSotnik]

All geometry is of Adams but one conrod was made in Catia V5 and preprocessed in Ansys to have flexible body. Also pistons are made by Adams itself (embedded C routine).

[navdrum001]

i see what the problem is here...its only firing on one cylinder.....hmmm...haha only kiding

[eradeziel]

I'm not sure really what you're saying - if the cylinders are horizontally opposed then the big-ends need to be 180 degrees out from eachother for each pair. If the block was a 120 degree V then the big-ends would have to be 120 degrees apart for each pair respectively.

A balanced six cylinder requires firing to be 120 degrees of *crank rotation* apart (720[4-stroke cycle] / 6[cyl]) = 120 degrees.

The animation works, the firing order looks like it could be 1,6,3,2,5,4. That would work.