Piezoelectric Actuator Position Constraint
Piezoelectric Actuator Position Constraint
(OP)
Hey,
I am trying to mount a piezoelectric actuator(PZT) on a plate. The PZT is rectangular and I have created a tie constraint between a surface on the bar and one of the PZT's surfaces. How do I put the PZT at a certain location on the bar in the assembly? I am assigning a coincident point position constraint between a point on the bar and a point on the PZT, is that sufficient? Thank you.
Regards.
I am trying to mount a piezoelectric actuator(PZT) on a plate. The PZT is rectangular and I have created a tie constraint between a surface on the bar and one of the PZT's surfaces. How do I put the PZT at a certain location on the bar in the assembly? I am assigning a coincident point position constraint between a point on the bar and a point on the PZT, is that sufficient? Thank you.
Regards.





RE: Piezoelectric Actuator Position Constraint
Secondly: I am simply trying to figure out what you are thinking because either this is too easy a question or you need to do a better job at explaining what the problem is.
*If* this question is simply about placing one instance next to another, then terms related to your specific problem (i.e., PZT) do not help. Assuming that is really the case, then what do you think should be the answer? Why do you have this question in the first place? What makes you think there may be more to it than a position constraint?
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RE: Piezoelectric Actuator Position Constraint
So I am trying to simulate an experiment I am performing in the lab. I have a rectangular bar and I have glued a piezoelectric sensor (acting as a transmitter) to the surface of the bar. I supply an sinusoidal electric potential to the pzt and a Lamb wave is generated in the bar. I then pick up the signals with another pzt sensor (acting as a receiver) which converts the wave to electric potential which is recorded.
For my simulation, I have created two different parts , the bar and two identical pzts ( I created the transmitter and created an identical copy of it to be used as the receiver). When I create the assembly, I first assign a tie constraint between the top surface of the bar and the bottom surface of the pzts. Now my question is : if I am trying to place the transmitter and the receiver at specific locations on the bar, do I use simple position constraint and assign a coincident point constraint between 2 points on each of the pzts and specific points on the bar?
For example , for the transmitter , let's say I am trying to place the pzt at a certain location 10 cm from the left edge of the bar, do I simply constraint one point of the pzt with an appropriate point on the bar to satisfy the condition? I honestly do not feel very confident about this method, mainly because when I apply the electric potential to one of the pzt's surfaces, it will expand and contract ( which generates the wave in the bar), however, I think that by constraining only one point , I am changing the way the wave will propagate.
Thank you for your time !
RE: Piezoelectric Actuator Position Constraint
All of what you mentioned is simply the geometry of the test set-up i.e., bar, pzt1, and pzt2. Now, from the experiment, you said pzt2 measures voltage. What does that voltage mean? Displacement/velocity/acceleration .. ? If it is one of these variables, why do you even need pzt2? Likewise, why do you need pzt1 when all you need is a source of excitation or a forcing function (if I recall my wave equation well)?
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RE: Piezoelectric Actuator Position Constraint
The voltage means displacement. You are right, it would be possible to output displacement without the pzt2 , however, I am trying to simulate my experiment in which I use pzt2 to record voltage( which is proportional to displacement) so I am trying to make the simulation as close as possible to the experiment in the lab. Moreover, it is also possible to apply a point source excitation,but that would not be very similar to the experiment and it is hard to find the exact magnitude of displacement that pzt1 is applying to the bar.
RE: Piezoelectric Actuator Position Constraint
Coming to your question, ideally, you may want to have displacement continuity between the surfaces i.e., merge the instances together. I know you must be using some sort of silicone gel between the surface of the transducer and the bar, but I'd try this first. An equation constraint between the opposing surfaces will do the job just fine.
Are you new to this forum? If so, please read these FAQ:
http://www.eng-tips.com/faqs.cfm?fid=376
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RE: Piezoelectric Actuator Position Constraint
RE: Piezoelectric Actuator Position Constraint
Are you new to this forum? If so, please read these FAQ:
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083