Damping effect in piezoelectric energy harvesting systems

AI Thread Summary
The discussion focuses on comparing two energy harvesting methods using piezoelectric materials: the standard technique involving a rectifier bridge and filtering capacitance, and the nonlinear SSHI technique that adds a switch and inductor. The nonlinear technique is noted for its efficiency in weak coupling but suffers from a damping effect in strong coupling scenarios. This damping effect arises because energy harvesting inherently removes energy from the system, which dampens vibrations more effectively with increased energy removal. The standard technique does not exhibit this damping effect as significantly, allowing for better performance in higher coupling factors. Understanding the physical implications of electromechanical coupling factors and how to create both weakly and strongly coupled structures in a laboratory setting remains a key inquiry.
nabs16
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Hi,

I have to make a report on an energy harvesting system using piezolectric materials by comparing two methods each other which are: the standard technique (rectifier bridge+filtering capacitance) and the nonlinear technique, by adding to the standard device a switch and an inductor in parallel of the piezoelectric element (SSHI technique) to optimize the electromechanical conversion.

According to the different articles, the nonlinear technique is very efficient in weak coupling (constant displacement amplitude) but not for larger electromechanical coupling factors due to a damping effect caused by the SSHI technique. What is concretly the damping effect ? why it doesn't occur using the standard technique ?

I know that the electromechanical coupling factor is low for weakly coupled structure and high for strongly coupled strucutre but i don't understand what it physically means. How can we obtain these two types of structures in laboratory ?

Thanks.
 
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nabs16 said:
Hi,

What is concretly the damping effect ? why it doesn't occur using the standard technique ?
All energy harvesting techniques remove energy from the system. The energy that is removed damps vibrations. More efficient energy removal causes more damping.

Another way to look at it is that energy harvesting is a form of active vibration control, where the energy removed is put to use instead of dissipated.
 
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nabs16 said:
comparing two methods each other which are: the standard technique (rectifier bridge+filtering capacitance) and the nonlinear technique, by adding to the standard device a switch and an inductor in parallel of the piezoelectric element (SSHI technique) to optimize the electromechanical conversion.

According to the different articles, the nonlinear technique is very efficient in weak coupling (constant displacement amplitude) but not for larger electromechanical coupling factors due to a damping effect caused by the SSHI technique. What is concretly the damping effect ? why it doesn't occur using the standard technique ?
Can you post links to the reading you have been doing about this? That would be a big help. Thanks.
 
I found this: http://www.psma.com/sites/default/f...energy-harvesting-using-piezoelectric-dev.pdf showing what @berkeman asked about.

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