resonant frequency
resonant frequency
(OP)
Hi,
I'm new in ANSYS.
I performed a piezoelectric resonator (with solid 5), I do a static, modal and harmonic analyse. I plot the current versus frequency and I read the resonant frequency by using "ZOOM"(frequency range).
I would like ANSYS give me this resonant frequency automatically. I found a similar program that giving resonant frequency automatically (it uses solid 226), and I include it in my program (using solid 5). But it doesn't work correctly.
Can you help me?
Thao.
I'm new in ANSYS.
I performed a piezoelectric resonator (with solid 5), I do a static, modal and harmonic analyse. I plot the current versus frequency and I read the resonant frequency by using "ZOOM"(frequency range).
I would like ANSYS give me this resonant frequency automatically. I found a similar program that giving resonant frequency automatically (it uses solid 226), and I include it in my program (using solid 5). But it doesn't work correctly.
Can you help me?
Thao.





RE: resonant frequency
Don't understand what you're doing here (ZOOM?). After you've done the modal analysis, you need to save the db, then go into /post1, read the results file, then issue the command:
set,list
This will list the natural frequencies [used in your harmonic analysis, assuming you're using modal superposition].
> I would like ANSYS give me this resonant frequency automatically. I found a similar program that giving resonant frequency automatically (it uses solid 226), and I include it in my program (using solid 5). But it doesn't work correctly.
Can you help me?
Don't understand any of this. Perhaps you could expand some more.
RE: resonant frequency
Finally, I would like to get the resonant frequency (in a table) on my curve "current versus frequency" in harmonic analysis. Do you think it's possible?
RE: resonant frequency
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See FAQ569-1083 for details on how to make best use of Eng-Tips.com
RE: resonant frequency
...
...
/COM, **** APPLY THE LOADS AND OBTAIN A FULL HARMONIC SOLUTION ****
/SOLU
ANTYPE,HARM ! Harmonic analysis
HROPT,full ! Full method
D,N1,VOLT,10.0 ! Assigns excitation voltage at beam interface
D,N2,VOLT,0.0 ! Assigns zero voltage at outer surface
OUTRES,,1
KBC,1
HARFRQ,1e6,2e6
NSUBST,50
SOLVE
FINISH
/COM, **** REVIEW THE RESULTS ****
/POST26
RFORCE,2,N1,AMPS ! Defines total reaction force data for storage
/PLOPTS,INFO,OFF
/PLOPTS,TITLE,OFF ! Removes title
/AXLAB,X,FREQUENCY
/AXLAB,Y,AMPERES
/VIEW
/VUP,,Y
PLVAR,2 ! Displays amperes as a function of frequency
PRVAR,2 ! Lists amperes as a function of frequency
FINISH
This curve (current vs frequency) indicates that the resonant frequency=1.475MHz and anti-resonant frequency=1.48MHz. To get this accurate values I have to vary a lot my frequency ranging.
My question is: does ansys can give me the resonant frequency (current peak) and the antiresonant frequency(current null)automatically?
P.S.1: for your last response: where is "variable viewer" and "add data"?