Excitation of energy harvesters using stick–slip motion

摘要: During the past decades a large number of energy harvesting systems with ability to transform mechanical into electrical have been proposed, ranging from exhibiting pure sinusoidal motion stochastic systems. However, date little emphasis has put on stick–slip as method for excitation Stick–slip can be associated both microscopic and macroscopic processes is omnipresent. The characterized by two stages. In first stage there buildup elastic motion, whereas in second released kinetic energy. We study here spectral signal characteristics different generators excited motion: piezoelectric macro fiber composite triboelectric generator. force voltage generated during were monitored, we found that density variables changes frequency characteristic manner, thus classifying slip-stick colored noise scheme. was exhibit power-law spectrum following an trend, where f frequency. governed product high-pass filter, density, intrinsic generator density. Here exhibited nearly flat below cutoff filter at higher frequencies, demonstrating coupling coefficient had response. On other hand, response varied non-systematic possibly related contact sites relaxation times occurring operation. average power delivered resistive load also measured excitations compared motion.