Tiny Mini-Generators Scavenge Energy From Ambient, Random Vibrations
Finding large-scale sources of kinetic energy to turn turbines isn't easy. But while there are only so many roaring rivers and flat, windy plains from which to harvest nature's natural motions, there's no shortage of tiny, random vibrations all around us. Now researchers at the University of Michigan have developed mini-generators that harness these. Miniature kinetic generators aren't new; for instance, many wristwatches are powered by energy gathered from the rhythmic swinging of our arms when we walk. Some piezoelectric generators have even been integrated into fabrics, meaning that your jacket could someday top off your cell phone battery or iPod, provided you move around enough. But many of these approaches require pronounced movements to harness any real degree of energy. The new Parametric Frequency Increased Generators from the U of M team have a huge advantage over other kinetic energy harvesters because they can scavenge the arbitrary, ambient, non-repeatable vibrations that...