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Sound velocity for piezoelectric materials in Comsol
Posted 23.07.2012, 07:33 GMT-4 1 Reply
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Hello,
I'm doing some simulations in Comsol, concerning a SAW filter,made by using some IDT (inter-digitated transducers).
Does any of you know how I can find out what sound velocity the simulator considers?
Am I right to assume that, in case I "build" a new material, the sound velocity will be the one for air, ~340m/s?
I need this in order to know where to look for proper characteristics.
I saw there is a property of the material that allows me to modify it. Will Comsol consider the new value
for simulating the device? Or I need to do some other modifications?
For the moment I am using GaN as a piezoelectric material, but I would appreciate if you know where
I could find the values of the sound velocity considered by Comsol.
Thank you,
Catalin BOTEZATU.
I'm doing some simulations in Comsol, concerning a SAW filter,made by using some IDT (inter-digitated transducers).
Does any of you know how I can find out what sound velocity the simulator considers?
Am I right to assume that, in case I "build" a new material, the sound velocity will be the one for air, ~340m/s?
I need this in order to know where to look for proper characteristics.
I saw there is a property of the material that allows me to modify it. Will Comsol consider the new value
for simulating the device? Or I need to do some other modifications?
For the moment I am using GaN as a piezoelectric material, but I would appreciate if you know where
I could find the values of the sound velocity considered by Comsol.
Thank you,
Catalin BOTEZATU.
1 Reply Last Post 23.07.2012, 11:27 GMT-4
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Posted:
1 decade ago
Sound velocity is not a material parameter in COMSOL, it results from the elastic properties and density. And it also depends on geometry and on the mode you excite. Longitudinal waves are faster than transverse waves.
You can edit the material parameters.
Cheers
Edgar
You can edit the material parameters.
Cheers
Edgar