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HOW TO FIND THE VIBRATION DISPLACEMENT PLOT AT THE RESONANT FREQUENCY OF A PIEZOELECTRIC MATERIAL

Posted 23.04.2015, 07:04 GMT-4 Acoustics & Vibrations, Structural Mechanics Version 4.3 3 Replies

Praveen Priyaranjan Nayak
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I WANT TO STUDY THE CONVERSE PIEZOELECTRIC EFFECT.I AM UNABLE TO CALCULATE THE RESONANT FREQUENCY OF THE PIEZOELECTRIC MATERIAL.SO THAT I CANNOT CALCULATE MAXIMUM VIBRATION DISPLACEMENT.THERE WAS ANA EIGEN FREQUENCY ANALYSIS.BUT I AM UNABLE TO EXTRACT THE RESONANT FREQUENCY OF THE MATERIAL.PLEASE HELP ME TO CALCULATE THIS.
3 Replies Last Post 18.12.2015, 00:13 GMT-5
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Hello Praveen Priyaranjan Nayak

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Harshada Gorhe
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Posted: 9 years ago 05.06.2015, 23:25 GMT-4
Hi Praveen

even i am trying to figure out the resonant frequency ( lowest mode i.e. breathing mode ) of a piezoelectric cylindrical transducer. But I am not able to do so.

according to theory the lowest mode of a cylindrical transducer should be c(air) / 2*(pi)*a
where a is radius
c(air) 330 m/s

Do you know how to proceed


Thanks,
Harshada

Hi Praveen even i am trying to figure out the resonant frequency ( lowest mode i.e. breathing mode ) of a piezoelectric cylindrical transducer. But I am not able to do so. according to theory the lowest mode of a cylindrical transducer should be c(air) / 2*(pi)*a where a is radius c(air) 330 m/s Do you know how to proceed Thanks, Harshada
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 9 years ago 07.06.2015, 12:29 GMT-4
Hi

not sure I understand your demand, if you do an eigenfrequency analysis, the displacements you get are arbitrary values, scalable depending on your normalisation settings, they can only be used for relative shape comparison, no absolute value are of use.
And this is a FEATURE not a bug, based on the way one do eigenfrequency calculations

--
Good luck
Ivar
Hi not sure I understand your demand, if you do an eigenfrequency analysis, the displacements you get are arbitrary values, scalable depending on your normalisation settings, they can only be used for relative shape comparison, no absolute value are of use. And this is a FEATURE not a bug, based on the way one do eigenfrequency calculations -- Good luck Ivar
Gunjan Kumari
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Posted: 9 years ago 18.12.2015, 00:13 GMT-5
Hey Ivar,
I am facing the same problem. Can I calculate the displacement on resonance frequency without applying any load or force?



Hi

not sure I understand your demand, if you do an eigenfrequency analysis, the displacements you get are arbitrary values, scalable depending on your normalisation settings, they can only be used for relative shape comparison, no absolute value are of use.
And this is a FEATURE not a bug, based on the way one do eigenfrequency calculations

--
Good luck
Ivar


Hey Ivar, I am facing the same problem. Can I calculate the displacement on resonance frequency without applying any load or force? [QUOTE] Hi not sure I understand your demand, if you do an eigenfrequency analysis, the displacements you get are arbitrary values, scalable depending on your normalisation settings, they can only be used for relative shape comparison, no absolute value are of use. And this is a FEATURE not a bug, based on the way one do eigenfrequency calculations -- Good luck Ivar [/QUOTE]

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