Hello again. Sorry for leaving out vital information about the tire and terrain model. I was using rigid tire and terrain and there was very little slip. Turns out the problem was an axle with very high inertia in the rigid suspension I hadn't taken into account.
Thanks! söndag 15 oktober 2023 kl. 18:55:34 UTC+2 skrev Radu Serban: > You don’t say anything about the tire model and terrain model you use. > You cannot leave that out when doing such a back of the envelope > calculation. > You are assuming rolling without slip. First thing I would do is monitor > the longitudinal slip at each wheel. > > > > --Radu > > > > *From:* 'Meninstick' via ProjectChrono <[email protected]> > *Sent:* Thursday, October 12, 2023 12:29 PM > *To:* ProjectChrono <[email protected]> > *Subject:* [chrono] Low acceleration > > > > Hello, I am currently modelling a simple vehicle, using the simpleEngine, > AutomaticTransmissionSimpleMap and SimpleDriveline templates. > > Using 40Nm tourque on the engine and a 1:1 gear ratio, 0.5 Front Torque > Fraction I get only about half the excpected acceleration. Are there any > losses I havn't acounted for? > > > > For the acceleration test the throttle is set to 1, resulting in instant > maximum tourque. > > The graph shows an acceleration from 0 to 1.03 m/s in 0.57s. Resulting in > a = 1.807 m/s^2. > > Using the effective mass (taking wheel inertia into account), F = m*a > results in F = 125N, 31.5N per wheel. > > With a tire radius of 0.165m I get 5.2N/wheel. Not the 10N/ wheel expected. > > > > Total mass: 66.3kg > > Tire radius: 0.165m > > Tire inertia: [0.015, 0.019, 0.015], > > Wheel inertia: [0.002, 0.004, 0.002] > > Effective mass: 69.8kg > > > > Any answers are appreciated :) > > > > tldr: > > Are there any losses between SimpleEngine, AutomaticTransmissionSimpleMap, > SimpleDriveline and the ground? > > -- > You received this message because you are subscribed to the Google Groups > "ProjectChrono" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/projectchrono/1dc252e8-ef9e-4f00-bd5a-12c793c22de9n%40googlegroups.com > > <https://groups.google.com/d/msgid/projectchrono/1dc252e8-ef9e-4f00-bd5a-12c793c22de9n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/188d1ec0-29b4-4f2b-b130-441cb970232an%40googlegroups.com.
