205 Development of Vibration Energy Harvester with Piezocomposite : 2nd report, Power Generation Performance Evaluation of Vibration Energy Harvester

In recent years, vibration energy harvesters have been widely studied to build self-powered wireless sensor networks for monitoring modern engineered systems. Although there has been significant research effort on different energy harvester configurations, the power output of a vibration energy harvester is known to be sensitive to various sources of uncertainties such as material properties, geometric tolerances, and operating conditions. This article proposes a reliability-based design optimization method to find an optimum design of energy harvester that satisfies the target reliability on power generation. This optimum design of vibration energy harvester demonstrates reliable power generation capability in the presence of the various sources of uncertainties.

Get full-text (via PubEx)

Soft and Hard Piezoelectric Ceramics for Vibration Energy Harvesting

Crystals ◽

10.3390/cryst10100907 ◽

2020 ◽

Vol 10 (10) ◽

pp. 907

Author(s):

Xiaodong Yan ◽

Mupeng Zheng ◽

Mankang Zhu ◽

Yudong Hou

Keyword(s):

Power Generation ◽

Energy Harvesting ◽

Lead Zirconate Titanate ◽

Energy Harvester ◽

Piezoelectric Materials ◽

Lead Zirconate ◽

Vibration Energy ◽

Vibration Energy Harvesting ◽

Low Frequencies ◽

Vibration Energy Harvester

The question as to which piezoelectric composition is favorable for energy harvesting has been addressed in the past few years. However, discussion on this topic continues. In this work, an answer is provided through a feasible method which can be used in selecting piezoelectric material. The energy harvesting behavior of hard (P4 and P8) and soft (P5 and P5H) lead zirconate titanate (PZT) ceramics was investigated. The results show that the maximum piezoelectric voltage coefficient g33 and transduction coefficient d33 × g33 were obtained in P5 ceramic. Meanwhile, the power generation characteristics at low frequencies were compared by the vibration energy harvester with a cantilever beam structure. The results indicate that the energy harvester fabricated by the P5 ceramic with the maximum d33 × g33 values also demonstrated the best power generation characteristics. The results unambiguously demonstrate that the power density and energy conversion efficiency of the energy harvesting devices are dominated by the d33 × g33 value of the piezoelectric materials.

Get full-text (via PubEx)

508 Performance Evaluation of Vibration Energy Harvester with Piezocomposite

The Proceedings of Conference of Kansai Branch ◽

10.1299/jsmekansai.2009.84._5-8_ ◽

2009 ◽

Vol 2009.84 (0) ◽

pp. _5-8_

Author(s):

Kazuhiko ADACHI ◽

Tohru TANAKA ◽

Hiroshi KANKI

Keyword(s):

Performance Evaluation ◽

Energy Harvester ◽

Vibration Energy ◽

Vibration Energy Harvester

Get full-text (via PubEx)

Experimental study of multi-magnet excitation for enhancing micro-power generation in piezoelectric vibration energy harvester

Mechanika ◽

10.5755/j01.mech.25.3.22968 ◽

2019 ◽

Vol 25 (3) ◽

pp. 219-224 ◽

Cited By ~ 1

Author(s):

Arūnas Kleiva ◽

Rolanas Daukševičius

Keyword(s):

Power Generation ◽

Energy Harvester ◽

Average Power ◽

Vibration Energy ◽

Natural Period ◽

Vibration Energy Harvester ◽

Micro Power ◽

Impulse Train ◽

Piezoelectric Vibration Energy Harvester ◽

Piezoelectric Vibration

The reported work experimentally investigates a method of more effective contactless mechanical frequency up-conversion that is based on multi-magnet plucking of a piezoelectric vibration energy harvester. Several moving excitation magnets are used to produce a periodic impulse train, which during a single plucking event consecutively deflects and then releases the cantilevered transducer to freely oscillate, thereby enabling enhanced micro-power generation performance. It was established that the proposed method is effective if a couple conditions are met. First, the transducer must be impulsively excited to produce resonant transient responses, which occurs when the ramping time of the magnetic impulse is close to the transducer rise time (defined as a quarter of the natural period). Second, the gap between the moving excitation magnets must be tuned to ensure that the impulse train period is as close to the natural period as possible. Measurements indicate that, in comparison to the conventional single-magnet plucking case, the consecutive excitation with three moving magnets leads to nearly six-fold (seven-fold) increase in average power output and total generated energy during the in-plane (out-of-plane) plucking regime.

Get full-text (via PubEx)