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MMM hmm - milliken's moment method


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#1 Greg Locock

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Posted 09 December 2011 - 04:29

Anybody using this? If so do you roll your own software or use Milliken's?



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#2 Malmedy

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Posted 19 December 2011 - 15:23

Anybody using this? If so do you roll your own software or use Milliken's?


I used MMM for comparison of different driveline's based on a single platform. Validation with a 2WD and AWD prototype gave very good results up too 1g lat acc! I made a few matlab m-files for the calculations. Im not quite sure about the extent of milikens software, but the diagram contains lots of information and I thought it was very usefull.

#3 Greg Locock

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Posted 20 December 2011 - 01:38

I used MMM for comparison of different driveline's based on a single platform. Validation with a 2WD and AWD prototype gave very good results up too 1g lat acc! I made a few matlab m-files for the calculations. Im not quite sure about the extent of milikens software, but the diagram contains lots of information and I thought it was very usefull.

Thanks. I know Ben has used it and one other tire engineer, I think they both wrote their own solvers.

Although writing the software might be fun, I've realised that it is fairly trivial to force a whole vehicle model to generate the data -basically constrain it to run at constant sideslip and steer angle, and measure the forces, so that's what i'll do. Zero time spent modelling.



#4 cheapracer

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Posted 20 December 2011 - 05:47

I'm happy someone answered you Greg, was looking bare there for a bit - it's lonely at the top so they say  ;)

#5 Keith Young

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Posted 20 December 2011 - 07:48

I used MMM for comparison of different driveline's based on a single platform. Validation with a 2WD and AWD prototype gave very good results up too 1g lat acc! I made a few matlab m-files for the calculations. Im not quite sure about the extent of milikens software, but the diagram contains lots of information and I thought it was very usefull.


Are the M-Files proprietary or could I see them? I have a full seat of Matlab and would love to tinker with them.

#6 Malmedy

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Posted 20 December 2011 - 12:37

Thanks. I know Ben has used it and one other tire engineer, I think they both wrote their own solvers.Although writing the software might be fun, I've realised that it is fairly trivial to force a whole vehicle model to generate the data -basically constrain it to run at constant sideslip and steer angle, and measure the forces, so that's what i'll do. Zero time spent modelling.


I did something similar. Having a full model will probably be beneficial for highly dynamic application, but even without the model the results for non SS are good (at least in a "sportier"vehicle). The results depend mainly on the tyre model.



Are the M-Files proprietary or could I see them? I have a full seat of Matlab and would love to tinker with them.


Im not sure about that: the report has been locked from publication till mid 2016. However I'm probaby meeting my supervisor whom I did the project for in a couple of days so will ask him. In the mean time I would be glad to help you with any questions you have. The best resource I found was SAE paper 760712, good in depth explanation and examples. Should you have trouble obtaining it please PM me.

Edited by Malmedy, 20 December 2011 - 13:02.


#7 Greg Locock

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Posted 20 December 2011 - 21:15

incidentally if anyone wants a quick intro http://www.millikenr...ch.com/mmm.html is the sales pitch, with the carpet plot on http://www.millikenr.../mmmoutput.html being the single most useful plot.

I'd emphasise Malmedy's point, it is mostly about tire properties. It tells you nothing about shock absorbers, PMI, and no doubt some other things.