Chao – it might be that the numerical integration formulas that we’re using in Chrono are not the best fit for you. If you look at celestial mechanics, I imagine you’d need symplectic integrators, perhaps high order. We don’t have that. I would give the HHT integrator a shot. I would set alpha to zero to get a trapezoidal integration formula, which in principle doesn’t dissipate energy and is second order. Not clear if that would work, but give it a shot and let us know if it made any difference. Good luck. Dan
From: [email protected] <[email protected]> On Behalf Of Chao Zhang Sent: Thursday, February 16, 2023 2:53 AM To: ProjectChrono <[email protected]> Subject: [chrono] Issue for setting multiple ChLinkMotorRotationSpeed Hi everyone, I am using chrono to test the performance of multiple specified axes of rotation by implementing a rotation motion of the Earth while orbiting the Sun, but when I use two ChLinkMotorRotationSpeed applied to the rigid body of the Earth, the results of the simulation are not satisfactory. For two or more ChLinkMotorRotationSpeed constraints, how can I achieve accurate results for multiple ChLinkMotorRotationSpeeds on a rigid body by having some of them move with the rigid body? Any suggestions would be appreciated! Chao -- 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]<mailto:[email protected]>. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/2f1c760b-08ff-4e96-ae59-b0259877d8e0n%40googlegroups.com<https://groups.google.com/d/msgid/projectchrono/2f1c760b-08ff-4e96-ae59-b0259877d8e0n%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/DM8PR06MB77032E4AEFD8410B4C4927DBB1A69%40DM8PR06MB7703.namprd06.prod.outlook.com.
