Voltage Coupling and Voltage Frequency Response Problems.
Hello to all,
I am trying to perform an energy harvesting analysis on a structure with 4 piezolecetric patches. I am using ACT Piezo&MEMS Extension. However, I come up with two major errors.
1) I have defined 8 (4x2) voltage couplings for top and bottom surfaces of the patches. When I conduct harmonic analysis, I receive errors such as "Node 2507 direction VOLT included in coupled sets 5 and 1". What is the reason of this error? and how can I resolve this problem?
2) I suppressed 7 voltage couplings and kept just one coupling (bottom face of the piezo), and run the harmonic analysis. Now, the solver worked, but this time when I want to plot the voltage frequency response for the remaining piezo, I got this following error.
"The user defined result might not be calculated successfully wholly or in some areas. There are some elements (or nodes) which do not contain data for the expression in: 133HARMONIC = VOLT
Note that the result data may not be contained in the result file or may not be applicable to some element types. Also note that the solver module can create elements, such as surface effect or interface elements, whose results cannot currently be scoped in a contour display."
If you help me about these problems, I will appreciate.