A Design of mass-spring type piezoelectric energy harvesting

Abstract

This study describes an experimental power generation system based on piezoelectric energy conversion for low power applications such as wireless sensor nodes. Piezoelectric transducers (PZTs) are especially suitable for energy harvesting from ambiance. A PZT is able to produce an open circuit voltage at hundreds volt level. But acquired current may be achieved at nanomicro scale. Therefore, PZT energy harvesters (PEH) have a very limited power generation capability. In order to generate higher output power, a series of PZT should be used in a PEH with proper electrical connection. In this paper, PEH is presented with a novel circuit topology for increase output power. The experimental system uses 20 diaphragm type PZTs with a 15 cm spring mounted at the center of each transducer. Necessary vibration is produced via a springmass structure of each PZT. Massspring structure is vibrated by the effect of wind. The maximum output power of the presented experimental generator for a nominal wind speed of 12 m/s is around 10.8 mJ. Results shows that proposed experimental generator is suitable for low power applications and output power of generator can be increased by using more PTZ is connected used circuit topology.

Piezoelectric wind energy harvesting from vortex- induced vibrations of an elastic beam

“…W e = [F V IV (x L)] w; (7) where , A, p , and A p are density and cross-sectional area of the elastic and piezoelectric layers, respectively. Using the Hamilton's principle, the governing equations are derived in the following form:…”

A survey on data acquisition methods in conditional monitoring of wind turbines

“…Today, vibration signals are widely used in rotary machines for fault detection and prediction [25], such as generators and wind turbines [26]. In this method, the movement or vibration of the equipment is expressed in the form of time signals or frequency diagrams.…”

Zemine Entegre Piezoelektrik Sensörden Enerji Hasadı

“…Titreşimden ve/veya uygulanan basınçtan elektrik enerjisi üreten piezoelektrik malzemelerle ilgili giderek daha fazla çalışmalar yapılmaktadır. Yapılan çalışmalarda Oy [2] kütle-yay yapısı rüzgâr etkisiyle titreşen 15cm'lik 20 adet diyafram tipi PZT'li, 12m/s nominal rüzgâr hızında sunulan deneysel jeneratörün maksimum çıkış gücünü 10.8mJ olarak ölçmüş, daha fazla PZT kullanarak jeneratörün çıkış gücünü arttırabileceğini ifade etmiştir. Özellikle gelişen teknolojiye bağlı olarak üretilen elektronik sistemlerin güç gereksinimlerinin düşüklüğü yani düşük güçlerde çalışabilmesi, piezoelektrik malzemelerden hasat edilen enerjinin düşük olmasına rağmen kullanılabilir olmasını sağlamıştır.…”