Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
An Issue on a quite simple model while doing Time Dependent Analysis by using LMS and MBD
Posted Aug 21, 2019, 11:07 a.m. EDT Version 5.3a 3 Replies
Please login with a confirmed email address before reporting spam
Hello,
This is a very simple model with only one block actually. But I have been struggling on this for quite a while.
When I disabled the Damper C1, it can pass the test. However, with the damper actived it showed an Error:
- Feature: Time-Dependent Solver 1 (sol1/t1) Repeated error test failures. May have reached a singularity. Time : 0 Last time step is not converged.
Can anyone help me on this? The two models with my idea is as attached. Thank you in advance.
Attachments:
Please login with a confirmed email address before reporting spam
Dear Leon,
Try using Velocity node instead of Displacement node to prescribe the motion when you have a damper in parallel to a spring. This should resolve the problem.
Best regards,
Pawan Soami
Please login with a confirmed email address before reporting spam
Dear Pawan,
Thank your response and the support!
Best wishes, Leon
Please login with a confirmed email address before reporting spam
Dear Leon,
Try using Velocity node instead of Displacement node to prescribe the motion when you have a damper in parallel to a spring. This should resolve the problem.
Best regards,
Pawan Soami
With the Velocity node instead of Displacement node, it works in the ‘Time Dependant Study’, but it does not work for the 'Eigenfrequency Study':
- Feature: Eigenvalue Solver 1 (sol2/e1) Singular matrix.
- Detail: There are 1 void equations (empty rows in matrix) for the variable comp1.lms.vel1_p1_u. at coordinates: (0,0,0), ...
Attachments: