Damping effect in piezoelectric energy harvesting systems

In summary, the conversation discusses the comparison between standard and nonlinear techniques for energy harvesting using piezoelectric materials. The nonlinear technique is more efficient for weak coupling but can cause a damping effect due to the SSHI technique. The conversation also mentions the concept of electromechanical coupling factor and obtaining different structures in a laboratory. Links to articles and a presentation on the topic are also provided.
  • #1
nabs16
7
1
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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  • #2
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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  • #3
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.
 
  • #6
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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1. What is the damping effect in piezoelectric energy harvesting systems?

The damping effect in piezoelectric energy harvesting systems refers to the decrease in the output voltage or power of the system due to the dissipation of energy caused by internal and external factors such as electrical resistance, mechanical losses, and environmental conditions.

2. Why is the damping effect important in piezoelectric energy harvesting systems?

The damping effect is important in piezoelectric energy harvesting systems because it can significantly affect the efficiency and performance of the system. If the damping effect is too high, it can decrease the output power and limit the amount of energy that can be harvested.

3. How can the damping effect be reduced in piezoelectric energy harvesting systems?

The damping effect in piezoelectric energy harvesting systems can be reduced by minimizing the mechanical losses through proper design and material selection, reducing the electrical resistance in the circuit, and optimizing the placement and orientation of the piezoelectric material.

4. What are some common methods used to measure the damping effect in piezoelectric energy harvesting systems?

Some common methods used to measure the damping effect in piezoelectric energy harvesting systems include impedance spectroscopy, frequency response analysis, and power output measurements under different load conditions.

5. How can the damping effect be utilized to improve the performance of piezoelectric energy harvesting systems?

The damping effect can be utilized to improve the performance of piezoelectric energy harvesting systems by incorporating it into the design and control strategies. For example, a damping circuit can be used to dissipate excessive energy and prevent damage to the system, and adaptive control techniques can be used to adjust the system parameters to compensate for the damping effect and maximize energy harvesting.

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