A New Method to Perform Direct Efficiency Measurement and Power Flow Analysis in Vibration Energy Harvesters
| Autor: | Jakub Krejci, Stanislav Pikula, Petr Benes, Stanislav Klusacek, Jan Kunz, Jiri Fialka, Zdenek Havranek |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
energy harvesting
Materials science Acoustics 02 engineering and technology lcsh:Chemical technology 7. Clean energy Biochemistry Article Analytical Chemistry polyvinylidene fluoride (PVDF) power conversion 0202 electrical engineering electronic engineering information engineering medicine lead zirconate titanate (PZT) lcsh:TP1-1185 Power-flow study Electrical and Electronic Engineering Instrumentation Mechanical energy piezoelectric ceramic efficiency measurement System of measurement 020208 electrical & electronic engineering Stiffness 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Power (physics) Vibration efficiency power flow piezoelectric medicine.symptom 0210 nano-technology Energy harvesting Energy (signal processing) |
| Zdroj: | Sensors, Vol 21, Iss 2388, p 2388 (2021) Sensors (Basel, Switzerland) Sensors Volume 21 Issue 7 SENSORS. 2021, vol. 21, issue 7, p. 1-19. |
| ISSN: | 1424-8220 |
| Popis: | Measuring the efficiency of piezo energy harvesters (PEHs) according to the definition constitutes a challenging task. The power consumption is often established in a simplified manner, by ignoring the mechanical losses and focusing exclusively on the mechanical power of the PEH. Generally, the input power is calculated from the PEH’s parameters. To improve the procedure, we have designed a method exploiting a measurement system that can directly establish the definition-based efficiency for different vibration amplitudes, frequencies, and resistance loads. Importantly, the parameters of the PEH need not be known. The input power is determined from the vibration source therefore, the method is suitable for comparing different types of PEHs. The novel system exhibits a combined absolute uncertainty of less than 0.5% and allows quantifying the losses. The approach was tested with two commercially available PEHs, namely, a lead zirconate titanate (PZT) MIDE PPA-1011 and a polyvinylidene fluoride (PVDF) TE LDTM-028K. To facilitate comparison with the proposed efficiency, we calculated and measured the quantity also by using one of the standard options (simplified efficiency). The standard concept yields higher values, especially in PVDFs. The difference arises from the device’s low stiffness, which produces high displacement that is proportional to the losses. Simultaneously, the insufficient stiffness markedly reduces the PEH’s mechanical power. This effect cannot be detected via the standard techniques. We identified the main sources of loss in the damping of the movement by the surrounding air and thermal losses. The latter source is caused by internal and interlayer friction. |
| Databáze: | OpenAIRE |
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