A study has been conducted to investigate the electrical power generated by a piezoelectric cantilever energy harvester used to power a car tyre pressure sensor. A theoretical model has been developed to predict the dynamics and electrical output of the piezoelectric energy harvester. The radial tyre deformation is the dominant source of excitation to the harvester, and this was modelled based on the kinematics of a car tyre. Numerical results demonstrate how the energy harvester responds to the radial deformation mechanically and electrically. The harvester generates most electrical power during the tyre deformation stage, with small amounts being generated when the harvester does not coincide with the tyre contact patch. Also, it was observed that the harvester is subjected to a centripetal force produced by the wheel rotation, and this causes the cantilever to experience a static offset from its neutral axis. For this reason, a bump stop should be located on the outer (tyre) side of the energy harvester to prevent large beam deflection caused by the centripetal force, as well as the vibration caused by the radial tyre deformation. Comparisons have been made using theoretical results obtained with and without a bump stop, and it was found that although the generated power is reduced when a bump stop is present, the maximum bending stress generated is decreased. Furthermore, theoretical predictions for the radial tyre deformation have been compared to published experimental measurements, and overall these were found to be in good agreement. Also, the theoretical predictions were compared to published experimental measurements. Good agreement was found between the predicted and experimentally-measured voltage outputs under radial tyre deformation. The harvester power output for TPMS (tyre pressure monitoring systems) application can be affected by many factors, such as fundamental natural frequency, car speed, bump stop location and initial gap. The theoretical model developed in this paper provides a useful tool to investigate the power generated by a piezoelectric cantilever energy harvester in a TPMS application. It is worth noting that mechanical modelling has been the main emphasis here, while a simple load resistor was used to demonstrate the electrical output. Further work is needed to extend the developed model to include a wireless module that can be integrated with the harvester for data transmission.
Piezoelectric energy harvesting for tyre pressure measurement applications
2013
11 Seiten, 13 Bilder, 2 Tabellen, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
Piezoelectric energy harvesting for tyre pressure measurement applications
SAGE Publications | 2013
|Piezoelectric energy harvesting for tyre pressure measurement applications
Kraftfahrwesen | 2013
|Piezoelectric energy harvesting for tyre pressure measurement applications
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