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Driven oscillators at mili Kelvin temperatures
Posted Sep 18, 2016, 11:32 p.m. EDT 1 Reply
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Hi all,
I have modelled the resonance frequencies of a 3D silicon cantilever (140 x 5 x 0.1 um) with a magnetic sphere (NdFeB, 3.43 um diameter) attached at one of its ends, while I keep the other end fixed. I used physics: Solid Mechanics --> study: eigenfrequencies. See attachement for an impression.
The resonance frequencies correspond well with the resonance frequencies I found in my experiment.
I really would like to drive the cantilever now on one of its resonance frequencies and see what the actual displacement is of my cantilever. I know Q from experiment and I know the amplitude of the force (I drive the cantilever with a piezo element), but I am really struggling with implementing this in COMSOL… I even could not figure out which proper study I need for this problem (frequency domain, time dependent, etc?), I worked on this now for 2 days, no result…
Anyone experience with driving an oscillator in COMSOL? Any advice what to do would be welcome, I couldn’t find an answer on this forum/internet yet…
Thank you very much in advance!
I have modelled the resonance frequencies of a 3D silicon cantilever (140 x 5 x 0.1 um) with a magnetic sphere (NdFeB, 3.43 um diameter) attached at one of its ends, while I keep the other end fixed. I used physics: Solid Mechanics --> study: eigenfrequencies. See attachement for an impression.
The resonance frequencies correspond well with the resonance frequencies I found in my experiment.
I really would like to drive the cantilever now on one of its resonance frequencies and see what the actual displacement is of my cantilever. I know Q from experiment and I know the amplitude of the force (I drive the cantilever with a piezo element), but I am really struggling with implementing this in COMSOL… I even could not figure out which proper study I need for this problem (frequency domain, time dependent, etc?), I worked on this now for 2 days, no result…
Anyone experience with driving an oscillator in COMSOL? Any advice what to do would be welcome, I couldn’t find an answer on this forum/internet yet…
Thank you very much in advance!
1 Reply Last Post Sep 19, 2016, 4:18 a.m. EDT
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Posted:
8 years ago
Dear Karen,
You may refer to the example of Thickness Shear Mode Quartz Oscillator. I think it's quite similar to your case. Here is the model link:
www.comsol.com/model/thickness-shear-mode-quartz-oscillator-4707
Hope it helps.
Best
Sarah
You may refer to the example of Thickness Shear Mode Quartz Oscillator. I think it's quite similar to your case. Here is the model link:
www.comsol.com/model/thickness-shear-mode-quartz-oscillator-4707
Hope it helps.
Best
Sarah