Request for additional car data. - Printable Version +- Forums ( https://www.vdrift.net/Forum)+-- Forum: Community ( https://www.vdrift.net/Forum/forumdisplay.php?fid=3)+--- Forum: Cars & Tracks ( https://www.vdrift.net/Forum/forumdisplay.php?fid=11)+--- Thread: Request for additional car data. ( /showthread.php?tid=2206) |

Request for additional car data. - vdriftz - 01-03-2016
Hi, I downloaded the car data files of the Modena 360 and of the 2002 Formula One racing car, containing extensive information about these vehicles. I would be very grateful if anybody can provide the following data on the above cars, or on any other suitable vehicles: (1) Wheel data (wheel = tyre + rim): The mass of each wheel m_w. The radius and width of each wheel, r_w and w_w. The moment of inertia of each wheel about an axis through its center of mass and perpendicular to the plane of the wheel, I_w_zz. The moment of inertia of each wheel about an axis through its center of mass and perpendicular to the ground plane, I_w_xx. (2) Car body data (car body = car without the four wheels) The mass of the car body m_b. The dimensions of a rectangular box (length, width and height) bounding the car body. The widths of the front and rear axles. The length of the wheelbase. The position of the center of mass of the car body relative to the wheelbase. The moment of inertia of the car body about an axis through its center of mass and perpendicular to the ground plane, I_b_zz. (3) Drive train data (drive train = engine + gearbox + drive shaft + differential gear-box + side shafts) Equivalent inertia of the drive train defined as follows. Approximate the rotational inertia of the drive train, with an equivalent inertia rotating about the axis of rotation of the engine crank shaft. Thanks very much. Constantine Frangos. RE: Request for additional car data. - arturo - 01-11-2016
For the Modena: - The radius and width of each wheel, r_w and w_w. Rear wheels are 275/40/18. This makes w_w = 275 and r_w = 325 Front wheels are 215/45/18. This makes w_w = 215 and r_w = 312 - The widths of the front and rear axles. 1669 / 1617 - The length of the wheelbase. 2600 - The position of the center of mass of the car body relative to the wheelbase. 1482 from the front axle / 1118 from the rear axle 43/57 % (http://www.zeperfs.com/en/fiche146-ferrari-360-modena.htm) These were of course the easy ones. For all the other data, I wish you luck. Please let us know if and where you can find them. RE: Request for additional car data. - vdriftz - 01-13-2016
(01-11-2016, 12:14 PM)arturo Wrote: For the Modena: Thanks for the data. This is a good start and hopefully other users will be able to supply the rest of the requested values. It seems that if vdrift is accurately simulating the motion of the vehicle body, and the motion of the wheels, and other moving parts like the engine, steering system, etc then the data I requested should be somewhere inside the vdrift software. Is this correct ? RE: Request for additional car data. - arturo - 01-13-2016
All the physics is in the .car files that you can find under vdrift/data/cars. You may start by looking at the description of VDrift car parameters here: https://github.com/VDrift/vdrift/blob/master/docs/Car_parameters.md, but please be aware that some of the data you want are not directly available. For instance, the moment of inertia of the car body is calculated from several "mass particules", including even the driver and her corresponding balancing ballast. Personally, I would take some of these data as an approximation as best, contrary to the ones that I provided you first, which are based on real-world measurements. As a aside, in the car I am developing I've put no polar inertia at all, but a single mass particle located (by definition) at the center of mass. This means that the simulation is realistic as long as all wheels have grip, but does not accurately represent what happens as soon as you start drifting. In a way, this makes keeping the car on the racing line a bit easier -- but life is already hard enough, don't you think? RE: Request for additional car data. - vdriftz - 01-14-2016
(01-13-2016, 10:10 PM)arturo Wrote: All the physics is in the .car files that you can find under vdrift/data/cars. Thanks for the fast response and interesting information. You mention that the moments of inertia of the vehicle is calculated internally in vdrift by using various point masses placed in the volume of the vehicle. If possible please provide these calculated moments of inertia for the vehicle body, for the wheels, and for any other moving vehicle parts for which calculated moments of inertia are available - thanks. RE: Request for additional car data. - arturo - 01-14-2016
Quote:If possible please provide these calculated moments of inertia for the vehicle body, for the wheels, and for any other moving vehicle parts for which calculated moments of inertia are available - thanks. I don't think any moment of inertia is calculated for the wheels, but I am sure that someone more knowledgeable than me could point to you where to find the calculation for the car body. |