QUESTION:
I want to expedite solution turnaround on a harmonic response analysis of a periodically arranged array of piezoelectric transducers. The transducer excitation will not be periodic, so symmetry of periodic boundary conditions will not be appropriate (I will have to represent the entire structure or at least several transducers to either side drive transducer). Ultimate objective is to determine cross talk between any given drive transducer and those adjacent to it (information to be used for the purposes of designing a control system).
Would substructuring work? How about doing a mode superposition harmonic response analysis.
ANSWER:
I tried substructuring,but was not successful (VOLT DOFs not allowed in a substructure including mass and damping) so I went with the mode superposition harmonic response procedure. I was leery of using voltage excitation on the drive electrode because when run this way, the drive electrode voltage was reported equal to zero in postprocessing and I also saw statements to the effect that non-zero DOF excitation cannot be used in mode superposition. So I used charge excitation (ANSYS command: F,,AMPS ' misleading but it's negative charge that gets applied with this command).
More details in the readme in the attached zip file.
The attachment to this solution contains an input file, macros, plots and an animation. Input file is completely parametric, creates, solves, and postprocesses model.
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QUESTION: I want to expedite solution turnaround on a harmonic response analysis of a periodically arranged array of piezoelectric transducers. The transducer excitation will not be periodic, so symmetry of periodic boundary conditions will not be appropriate (I will have to represent the entire structure or at least several transducers to either side drive transducer). Ultimate objective is to determine cross talk between any given drive transducer and those adjacent to it (information to be used for the purposes of designing a control system). Would substructuring work? How about doing a mode superposition harmonic response analysis. ANSWER: I tried substructuring,but was not successful (VOLT DOFs not allowed in a substructure including mass and damping) so I went with the mode superposition harmonic response procedure. I was leery of using voltage excitation on the drive electrode because when run this way, the drive electrode voltage was reported equal to zero in postprocessing and I also saw statements to the effect that non-zero DOF excitation cannot be used in mode superposition. So I used charge excitation (ANSYS command: F,,AMPS ` misleading but it`s negative charge that gets applied with this command). More details in the readme in the attached zip file. The attachment to this solution contains an input file, macros, plots and an animation. Input file is completely parametric, creates, solves, and postprocesses model. |
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