Yeah, It seems like, decreasing of time for integration solves the problem.
Thank you so much!
By chance, maybe you know the possible issues with drawing the spring
between "body" and "wheel", I use such definition:
tools::drawSpring(vis.get(), 1, newSystem.GetBodyPos(),
newSystem.GetWheelPos(),
ChColor(1, 1, 1), 80, 10, true);
but it is now working, as you can see in the screenshot.
Best Regards
Aleksandr Prokhorov
On Thu, 7 Nov 2024 at 07:28, Dario Mangoni <[email protected]> wrote:
> Also, if you are using, as I expect, an iterative solver, increase the
> number of iterations!
>
> Il giorno mercoledì 6 novembre 2024 alle 21:00:18 UTC+1 Dan Negrut ha
> scritto:
>
>> Alex – did you try to reduce the integration time step to some small
>> value, to see if this makes any difference?
>>
>> Dan
>>
>> ---------------------------------------------
>>
>> Bernard A. and Frances M. Weideman Professor
>>
>> NVIDIA CUDA Fellow
>>
>> Department of Mechanical Engineering
>>
>> Department of Computer Science
>>
>> University of Wisconsin - Madison
>>
>> 4150ME, 1513 University Avenue
>>
>> Madison, WI 53706-1572
>>
>> 608 772 0914 <(608)%20772-0914>
>>
>> http://sbel.wisc.edu/
>>
>> http://projectchrono.org/
>>
>> ---------------------------------------------
>>
>>
>>
>> *From:* [email protected] <[email protected]> *On
>> Behalf Of *Aleksandr Prokhorov
>> *Sent:* Wednesday, November 6, 2024 10:55 AM
>> *To:* ProjectChrono <[email protected]>
>> *Subject:* [chrono] Link unexpected behavior
>>
>>
>>
>> Dear CHRONO.
>>
>>
>>
>> I have started to investigate a CHRONO engine recently.
>>
>> The problem I am trying to solve is the control of 1-DOF system in the
>> application of the quarter-car model. I have a picture of my model assembly.
>>
>>
>>
>>
>>
>> The links a Initialized with te next constraints:
>>
>>
>>
>> wheelAxisLink =
>> chrono_types::make_shared<ChLinkMateSpherical>();
>> wheelAxisLink->Initialize(wheel, axis, false,
>> wheel->GetPos(), axis->GetPos());
>> wheelAxisLink->SetConstrainedCoords(true, true, true,
>> true, true, false);
>>
>> holdBodyRotationLink =
>> chrono_types::make_shared<ChLinkMateSpherical>();
>> holdBodyRotationLink->Initialize(body, floor, false,
>> body->GetPos(), floor->GetPos());
>> holdBodyRotationLink->SetConstrainedCoords(false, false,
>> false, true, true, true);
>>
>> holdBodyTranslationLink =
>> chrono_types::make_shared<ChLinkMateSpherical>();
>> holdBodyTranslationLink->Initialize(body, axis, false,
>> body->GetPos(), axis->GetPos());
>> holdBodyTranslationLink->SetConstrainedCoords(true,
>> false, true, true, true, true);
>>
>>
>>
>> It is working properly. But if the mass of "wheel" is significantly
>> larger than the mass of "body" and the speed of motor rotation is high, the
>> constraints applied for the links are not satisfied anymore.
>>
>>
>>
>>
>>
>> Could you help with any idea how to fix that issue if any exists?
>>
>> Also by some reason, the pice of code:
>>
>>
>>
>> tools::drawSpring(vis.get(), 1, newSystem.GetBodyPos(),
>> newSystem.GetWheelPos(),
>> ChColor(1, 1, 1), 80, 10, true);
>>
>> does not make a "spring" visible.
>>
>>
>>
>>
>>
>> Best regards, Alex
>>
>>
>>
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