{"id":476,"date":"2015-04-14T10:43:07","date_gmt":"2015-04-14T15:43:07","guid":{"rendered":"http:\/\/blogs.cae.tntech.edu\/santon\/?p=476"},"modified":"2015-04-14T10:43:07","modified_gmt":"2015-04-14T15:43:07","slug":"chase-ray-defends-his-ms-thesis","status":"publish","type":"post","link":"https:\/\/sites.tntech.edu\/dssl\/2015\/04\/14\/chase-ray-defends-his-ms-thesis\/","title":{"rendered":"Chase Ray defends his MS thesis"},"content":{"rendered":"<p>Chase Ray successfully defended his Masters of Science degree in Mechanical Engineering entitled &#8220;<strong>Piezoelectret Foam in a Multilayer Stack Configuration for Vibration Energy Harvesting<\/strong>&#8221; on April 14, 2015. \u00a0Congratulations Chase!<\/p>\n<p>Abstract:<\/p>\n<p>Electronic devices are high demand commodities in today&#8217;s world, and such devices\u00a0will continue increasing in popularity. Currently, batteries are implemented to provide\u00a0power to these devices; however, the need for battery replacement, their cost, and\u00a0the waste associated with battery disposal present a need for advances in self- powered\u00a0technology. Energy harvesting technology has great potential to alleviate the drawbacks\u00a0of batteries. In this work, a novel piezoelectret foam material is investigated for low-level\u00a0vibration energy harvesting. Specifically, piezoelectret foam assembled in a multilayer\u00a0stack configuration\u00a0is explored. Modeling and experimentation of the stack behavior\u00a0when excited in compression at low frequencies are performed to investigate piezoelectret\u00a0foam as a multilayer energy harvester. An examination of modeling piezoelectret\u00a0foam as a stack with an equivalent circuit is made following recently published work and\u00a0is used in this study. Two 20-layer prototype devices and a 40-layer prototype device are\u00a0fabricated and experimentally tested via harmonic base excitation. Electromechanical\u00a0testing is performed by compressing the foam stacks to obtain output electrical energy;\u00a0consequently, allowing the frequency response between input mechanical energy and output\u00a0electrical energy to be developed. Modeling results are compared to the experimental\u00a0measurements to assess the fidelity\u00a0of the model at resonance. Lastly, energy harvesting\u00a0experimentation in which the devices are subject to harmonic base excitation at the\u00a0natural frequency is conducted to determine the ability of the piezoelectret foam stack\u00a0to successfully charge a capacitor. For a 20-layer stack, a 100 F capacitor is charged to\u00a01.45 V in fifteen minutes, and produces a peak power of 0.45 W. A 40-layer stack can\u00a0charge a 100 F to 1.7 V in iffteen minutes, and produce a peak power of 0.89 W.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chase Ray successfully defended his Masters of Science degree in Mechanical Engineering entitled &#8220;Piezoelectret Foam in a Multilayer Stack Configuration for Vibration Energy Harvesting&#8221; on April 14, 2015. \u00a0Congratulations Chase! Abstract: Electronic devices are high demand commodities in today&#8217;s world, and such devices\u00a0will continue increasing in popularity. Currently, batteries are implemented to provide\u00a0power to these &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/sites.tntech.edu\/dssl\/2015\/04\/14\/chase-ray-defends-his-ms-thesis\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Chase Ray defends his MS thesis&#8221;<\/span><\/a><\/p>\n","protected":false},"author":128,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-476","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/posts\/476","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/users\/128"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/comments?post=476"}],"version-history":[{"count":0,"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/posts\/476\/revisions"}],"wp:attachment":[{"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/media?parent=476"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/categories?post=476"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.tntech.edu\/dssl\/wp-json\/wp\/v2\/tags?post=476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}