Conrod

All that has to do with the power train, gearbox, clutch, fuels and lubricants, etc. Generally the mechanical side of Formula One.
benberger15
0
Joined: 28 Dec 2011, 17:19

Conrod

Post

I'm currently studying motorsport engineering at swansea.

I was wondering if anyone could help me with a report I have been set.

I am required to find out the dynamic forces that a typical formula 1 conrod undergoes and how these forces affected by engine speed, reciprocating mass, stroke and ratio between conrod length and crank radius.

Any help that you can provide would be excellent! :D :D :D

Brian.G
334
Joined: 10 Dec 2010, 23:52
Location: Ireland
Contact:

Re: Conrod

Post

I dont think the forum does homework answers. But I could be wrong,

Brian,
If you think you cant, you wont, If you think you can, you will

Belatti
33
Joined: 10 Jul 2007, 21:48
Location: Argentina

Re: Conrod

Post

Sorry, but what kind of teacher can ask you to find all that instead of actually teaching it?
"You need great passion, because everything you do with great pleasure, you do well." -Juan Manuel Fangio

"I have no idols. I admire work, dedication and competence." -Ayrton Senna

Brian.G
334
Joined: 10 Dec 2010, 23:52
Location: Ireland
Contact:

Re: Conrod

Post

Belatti wrote:Sorry, but what kind of teacher can ask you to find all that instead of actually teaching it?
Or how about wanting to find it all out yourself so that you understand it...he must have missed the three yrs prior to the report... :idea:
If you think you cant, you wont, If you think you can, you will

bhall
244
Joined: 28 Feb 2006, 21:26

Re: Conrod

Post

I love the condescension that gets doled out with (or in lieu of) a lot of the help around here.


throwaway1
1
Joined: 26 Dec 2011, 19:46

Re: Conrod

Post

benberger15 wrote:I'm currently studying motorsport engineering at swansea.

I was wondering if anyone could help me with a report I have been set.

I am required to find out the dynamic forces that a typical formula 1 conrod undergoes and how these forces affected by engine speed, reciprocating mass, stroke and ratio between conrod length and crank radius.

Any help that you can provide would be excellent! :D :D :D

First you need the stroke, bore, and rod length. With that you can calculate the piston's position at any point in a cycle. Using that calculate the velocity at a given rpm. Take that derivative for acceleration. With that and the piston's mass you can figure out some of the forces. The rest is a bit more complicated and you need to read up on it.

akbar21881
0
Joined: 28 Jun 2003, 22:49
Location: bristol,uk

Re: Conrod

Post

benberger15 wrote:I'm currently studying motorsport engineering at swansea.

I was wondering if anyone could help me with a report I have been set.

I am required to find out the dynamic forces that a typical formula 1 conrod undergoes and how these forces affected by engine speed, reciprocating mass, stroke and ratio between conrod length and crank radius.

Any help that you can provide would be excellent! :D :D :D
I can't give the exact answer. But your question here is what the powertrain design engineer do in the early stage of the conrod design, to basically size the conrod as well as its small end and big end bearing, shank cross section size etc..

Basically, the thing to do after the geometric and inertia of the component has been determine is to estimate the cylinder pressure. This will then give you the force on the conrod for a given crank angle.

This should provide the clue in looking for the related equation typically used in classical method in sizing up the conrod. I'm quite rusty with the formula as I have left my powertrain CAE engineer job for almost year now!

johnny comelately
110
Joined: 10 Apr 2015, 00:55
Location: Australia

Re: Conrod

Post

Hoping this is a good enough spot for (From - https://twitter.com/CalumDouglas1):
Toyota @F1 Connecting Rod - 2008 car. Next to it, Daimler-Benz DB601 connecting rod, from #WW2, 1940 Messerschmitt 109. The F1 part is about 4x smaller, but conceptually how much have we been able to advance on it ? - not much...

Image

63l8qrrfy6
368
Joined: 17 Feb 2016, 21:36

Re: Conrod

Post

Pretty accurate.
Calum and I were colleagues for a year or so. He now spends his time researching and writing a book (maybe more) on WW2 engines.

He is a brilliant engineer and has put an incredible amount of effort into documenting aero engine development throughout WW2.

User avatar
strad
117
Joined: 02 Jan 2010, 01:57

Re: Conrod

Post

I'm not a math whiz that can hand you the answers but I can bet that there are formulas available and that the teacher wants you to use those to find the answer yourself.
To achieve anything, you must be prepared to dabble on the boundary of disaster.”
Sir Stirling Moss

User avatar
godlameroso
309
Joined: 16 Jan 2010, 21:27
Location: Miami FL

Re: Conrod

Post

7 years too late :wink: I'm guessing by now he's either got a career in the industry, or hanging out at home.
Saishū kōnā

johnny comelately
110
Joined: 10 Apr 2015, 00:55
Location: Australia

Re: Conrod

Post

Sorry for not being clear (about dates) , just trying to stay within the correct subject thread topic post system.

gruntguru
563
Joined: 21 Feb 2009, 07:43

Re: Conrod

Post

benberger15 wrote:
28 Dec 2011, 17:22
I'm currently studying motorsport engineering at swansea.

I was wondering if anyone could help me with a report I have been set.

I am required to find out the dynamic forces that a typical formula 1 conrod undergoes and how these forces affected by engine speed, reciprocating mass, stroke and ratio between conrod length and crank radius.

Any help that you can provide would be excellent! :D :D :D
The dynamic forces you will have to calculate yourself.

The static force due to cylinder pressure is in this forum somewhere but the units are rather odd (elephants???)
je suis charlie

63l8qrrfy6
368
Joined: 17 Feb 2016, 21:36

Re: Conrod

Post

I know the original topic is a bit old but since it has been resurrected here's an interesting bit of trivia:

Most companies that manufacture connecting rods and swear by either I beam or H beam sections have no clue whatsoever what the bending moments on the rod are. They design the rods purely based on tensile and compressive loads which produce shank stresses independent of the second moment of area.

Of course bending stresses are negligible in all but the highest revving engines yet there is such a debate about I vs H section when really in 90% of the cases it is nothing but a marketing gimmick.