Menu

Discussion Forum

New Discussion
Filter

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

Is there any model about anchor damping in COMSOL?

Posted Oct 25, 2011, 4:19 a.m. EDT MEMS & Nanotechnology, Acoustics & Vibrations, MEMS & Piezoelectric Devices, Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 4.1 4 Replies

James
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi everyone

I am a beginner in COMSOL and I want to calculte the anchor-loss-limited Q in MEMS resonator (square plate resonator which has four anchors at its four corners). I think the perfectly matched layers (PMLs) should be used to absorp the outgoing elastic energy. Could anyone share a model about anchor damping? Thanks.

James
4 Replies Last Post Mar 27, 2012, 6:26 a.m. EDT
COMSOL Moderator

Hello James

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Amir Heidari
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Mar 16, 2012, 1:20 p.m. EDT
Hi James,

You can refer to the attached paper. In this paper, the material properties that you can enter for the Matched Layer is mentioned.:

Good luck,
Amir
Hi James, You can refer to the attached paper. In this paper, the material properties that you can enter for the Matched Layer is mentioned.: Good luck, Amir
James
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Mar 20, 2012, 8:00 a.m. EDT

Hi James,

You can refer to the attached paper. In this paper, the material properties that you can enter for the Matched Layer is mentioned.:

Good luck,
Amir


Hi Amir

Thanks for your help. I have one question for this paper. Do you know how to calculate the attenuation constant alpha? The author of this paper sets it to 3 but gives no reason.

Regards,

James
[QUOTE] Hi James, You can refer to the attached paper. In this paper, the material properties that you can enter for the Matched Layer is mentioned.: Good luck, Amir [/QUOTE] Hi Amir Thanks for your help. I have one question for this paper. Do you know how to calculate the attenuation constant alpha? The author of this paper sets it to 3 but gives no reason. Regards, James
Hadi Najar
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Mar 26, 2012, 5:22 p.m. EDT
James:

I think you have figure that out by yourself. It is geometry dependent and for high Q-factors you require a different a than 3. Play with mesh size and a and see when your result converges.

Cheers,
Hadi
James: I think you have figure that out by yourself. It is geometry dependent and for high Q-factors you require a different a than 3. Play with mesh size and a and see when your result converges. Cheers, Hadi
Sankha Mukherjee
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Mar 27, 2012, 6:26 a.m. EDT
Hello,

Can you guys tell me how to calculate Q-factor using Eigen frequency analysis? Basically I have cantilever beam, but I do not how to calculate Q-factor.

Thanks

Sankha
Hello, Can you guys tell me how to calculate Q-factor using Eigen frequency analysis? Basically I have cantilever beam, but I do not how to calculate Q-factor. Thanks Sankha

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content