Menu

Discussion Forum

New Discussion
Filter

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.

Sensitivity Analysis

Posted May 17, 2024, 3:55 a.m. EDT Version 5.5 2 Replies

Sourabh Alagundagi
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello,

I am simulating a capacitive pressure sensor and am stuck with Sensitivity Analysis. I have used Sensitivity analysis under Study 1 and have added Maxwell Capacitance expression comp1.es.C11 as the Objective Function and selected Pressure as my Control Variable. I am unable to understand the process involved in Sensitivity analysis as to whether Change in Capacitance divided by Change in Pressure is being computed or not which is the formula to calculate the Sensitivity. When I check for the sensitivity vs. pressure graph in Results section, I am getting a wrong curve.

Kindly clear my doubt over what is happening behind the COMSOL Sensitivity Analysis process.

Regards, Sourabh

2 Replies Last Post May 20, 2024, 3:15 a.m. EDT
soniya sonu
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 6 months ago May 17, 2024, 8:18 a.m. EDT

Hey hi, please check that the correct expressions are used for sensitivity calculation. If the correct parameters are selected, and verify the unit and scaling of your variables. It's possible that the wrong formula or parameter are being used, leading to inaccurate results.

Hey hi, please check that the correct expressions are used for sensitivity calculation. If the correct parameters are selected, and verify the unit and scaling of your variables. It's possible that the wrong formula or parameter are being used, leading to inaccurate results.
Sourabh Alagundagi
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 6 months ago May 20, 2024, 3:15 a.m. EDT

Hey hi, please check that the correct expressions are used for sensitivity calculation. If the correct parameters are selected, and verify the unit and scaling of your variables. It's possible that the wrong formula or parameter are being used, leading to inaccurate results.

Hello Soniya,

Thanks for the response. I am using the in-built 'Maxwell Capacitance' expression as the Objective Expression. I tried using another expression as per the blog https://www.comsol.com/blogs/computing-design-sensitivities-in-comsol-multiphysics/, even then I am getting the wrong sensitivity vs. pressure curve.

I even went through the Sensitivity Analysis document which doesn't exactly explain the process behind the same. So I sought help of COMSOL team to explain me the process behind Sensitivity Analysis.

Kindly help me with the same.

>Hey hi, please check that the correct expressions are used for sensitivity calculation. If the correct parameters are selected, and verify the unit and scaling of your variables. It's possible that the wrong formula or parameter are being used, leading to inaccurate results. Hello Soniya, Thanks for the response. I am using the in-built 'Maxwell Capacitance' expression as the Objective Expression. I tried using another expression as per the blog *https://www.comsol.com/blogs/computing-design-sensitivities-in-comsol-multiphysics/*, even then I am getting the wrong sensitivity vs. pressure curve. I even went through the *Sensitivity Analysis* document which doesn't exactly explain the process behind the same. So I sought help of COMSOL team to explain me the process behind *Sensitivity Analysis*. Kindly help me with the same.

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