Ok, so I had a quick look at the standards, and I will have to use them to first of all have a vehicle dynamics simulation set up and use them as a test, so for steady state cornering I will have to make a Matlab model of a car going round a path of a constant radius with increasing speed (from what I found so far for your example). Carry out all the other tests according to the standards, and then use matlab (or some other software?) to evaluate the data and find the optimum dynamical set up so I can justify my choice of the set up?Tim.Wright wrote:What I was proposing was not to write a vehicle simulation in Matlab (though this is totally possible and has been done many times before). I proposed that you write a program that takes simulation or test data and analyses it in order to quantify the vehicle's handling performance.
All of the major vehicle manufactures have software like this developed in house and some students have done this already in FSAE.
Have a look at the ISO/SAE standard for:
Steady state cornering
Power on (actually not a huge fan of this method but useful as a starting point)
Power off (not a huge fan)
Your program would then take the test data, perform the necessary sensor processing (filtering, corrections, transformations etc) and then calclulate various metrics as defined in the ISO norms, Milliken, Guiggiani etc..
That way, you can quantify all your decisions - both to appease design judges as well as fellow team members.
Otherwise - what else are you going to say when someone asks you why have you chosen this much bumpsteer? Why have you complicated your life with push rods and rockers? Then there is usually a team member telling you that beam axles are the way to go (they are probably right too). How else can you answer these questions or make these decisions in an informed way if you have no way of quantifying the handling of the car?
Like I said before its THE biggest thing missing in FSAE at the moment. Chassis/suspension choices are almost always made with an equal mix of rules of thumb and handwaving which is the polar opposite of engineering.
I also had a look at some of Bill Cobbs stuff, most of it seems tyre related, but it looks pretty complicated, but at the same time I think he has written all the code to calculate the tyre performance output (for example)?