From Sway to Pay

Carter D.
11th Grade, Westshore Jr/Sr High School, Melbourne Florida
Teacher: Tonya Galaida

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Abstract: The purpose of this experiment is to design a device, using dampers in skyscrapers that will convert mechanical energy to electrical energy. If a scale model of a skyscraper damper is built and the device explained in the procedure is affixed to it, then one will be capable of harnessing electrical energy from the mechanical energy of the damper by utilizing the piezoelectric properties of quartz. That is, when pressure is applied to quartz, a voltage differential collects on its surface.

First, construct a 50 cm by 60 cm scale model of a skyscraper damper, and add springs to it in the correct places. Insert two quartz crystals with a volume of 1 cubic cm each between the coils of each spring so that when the frame is bent the spring will compress to squeeze the crystals. Connect a voltmeter to each of the crystals, and measure the electrical output, in AC volts, DC volts, and 300 mV (DC), when the frame is rocked, thus squeezing the quartz. Also connect the voltmeter to a crystal not in the springs, as the control group. Repeat these measurements four times.

After following these instructions, one will find that the experimental group (crystals in the device) generate an electrical charge much larger than that of the control group (which is usually 0.000). The charges in the experimental group are a result of the pressure exerted on them by the springs when the frame is rocked.

This data shows that it is possible to create a device that will convert the mechanical energy from a skyscraper damper to electrical energy by taking advantage of the piezoelectric properties of quartz.