{"id":55707,"date":"2022-12-13T15:59:20","date_gmt":"2022-12-13T13:59:20","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=55707"},"modified":"2022-12-13T15:59:20","modified_gmt":"2022-12-13T13:59:20","slug":"these-s-tessier-modulation-spatio-temporelle-dun-cristal-phononique-piezoelectrique-experiences-et-simulations-en-regimes-subsonique-sonique-et-supersonique","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/theses-2022\/these-s-tessier-modulation-spatio-temporelle-dun-cristal-phononique-piezoelectrique-experiences-et-simulations-en-regimes-subsonique-sonique-et-supersonique.html","title":{"rendered":"THESE : S. TESSIER &#8211; Modulation spatio-temporelle d\u2019un cristal phononique pi\u00e9zo\u00e9lectrique: exp\u00e9riences et simulations en r\u00e9gimes subsonique, sonique et supersonique"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_heading  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_58_bjvvp5t8sdfj\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;border-style:solid;border-color:#000;background-position:0% 0%;background-repeat:no-repeat;width:180px;height:30px;left:0px;top:231px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-quote-right\" style=\"color:#ffffff;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>ACTUALITES<\/ls-layer><\/div><\/div><\/div><div id='after_layer_slider_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-55707'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lbmag529-574c82485edb7bd7a14f5f9c39040e0b\">\n#top .av-special-heading.av-lbmag529-574c82485edb7bd7a14f5f9c39040e0b{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-lbmag529-574c82485edb7bd7a14f5f9c39040e0b .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-lbmag529-574c82485edb7bd7a14f5f9c39040e0b .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-lbmag529-574c82485edb7bd7a14f5f9c39040e0b av-special-heading-h2  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >THESE : S. TESSIER &#8211; Modulation spatio-temporelle d\u2019un cristal phononique pi\u00e9zo\u00e9lectrique: exp\u00e9riences et simulations en r\u00e9gimes subsonique, sonique et supersonique <\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-18u73nj-dad6a947580930e400fc42ba200e80f1\">\n#top .hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1{\nmargin-top:5px;\nmargin-bottom:5px;\n}\n.hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1 .hr-inner{\nwidth:100%;\n}\n<\/style>\n<div  class='hr av-18u73nj-dad6a947580930e400fc42ba200e80f1 hr-custom  avia-builder-el-2  el_after_av_heading  el_before_av_textblock  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-thin'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-jriy64i8-2f4600354c0449b610997916bbd9b6bc'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" >\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-68e036126b913e5028f77311dc66b825\">\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825{\ncolor:#bfbfbf;\nborder-color:#bfbfbf;\n}\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825 .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-68e036126b913e5028f77311dc66b825 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue8c9' data-av_iconfont='entypo-fontello' ><\/span><\/span>\n<p><strong>S. TESSIER<br \/>\n<\/strong><\/p>\n<p>Soutenance : <strong>12 d\u00e9cembre 2022<br \/>\n<\/strong>Th\u00e8se de doctorat en Acoustique, Universit\u00e9 de Lille, ENGSYS Sciences de l\u2019ing\u00e9nierie et des syst\u00e8mes<\/p>\n<\/div><\/section>\n<section  class='av_textblock_section av-jtefqx33-628129dba2299b2ecd65ebfc92eac29d'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div  class='hr av-kjh3zw-4dff888f744b728a1aca9b3a0971493a hr-default  avia-builder-el-6  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<h5>Summary:<\/h5>\n<p>La propagation d\u2019ondes dans des milieux dont les param\u00e8tres mat\u00e9riaux sont modul\u00e9s de mani\u00e8re spatio-temporelle est largement \u00e9tudi\u00e9e depuis plusieurs ann\u00e9es. N\u00e9anmoins, des r\u00e9alisations exp\u00e9rimentales simples peinent \u00e0 voir le jour, des modifications \u00e0 la fois notables et rapides des param\u00e8tres \u00e9tant difficiles \u00e0 obtenir. Cette th\u00e8se s\u2019int\u00e9resse \u00e0 des cristaux phononiques pi\u00e9zo\u00e9lectriques modul\u00e9s permettant d\u2019\u00e9viter cet \u00e9cueil. En effet, il est possible dans ce type de syst\u00e8me d\u2019influencer la propagation des ondes acoustiques en modulant simplement les conditions \u00e9lectriques sur un ensemble d\u2019\u00e9lectrodes. La modulation s\u2019effectuant sur des conditions \u00e9lectriques, il est possible de la contr\u00f4ler \u00e0 travers des circuits \u00e9lectriques, simplifiant ainsi sa mise en place exp\u00e9rimentale et permettant d\u2019atteindre des vitesses de modulation \u00e9lev\u00e9es. Les effets ainsi g\u00e9n\u00e9r\u00e9s sont semblables \u00e0 ceux observ\u00e9s pour une modulation des param\u00e8tres mat\u00e9riau. Par exemple, un d\u00e9calage continu d\u2019un ensemble de conditions de mise \u00e0 la masse permet d\u2019obtenir un comportement non-r\u00e9ciproque et des bandes interdites de Bragg directionnelles, typiques des milieux \u00e0 modulations spatio-temporelles. Une \u00e9tude exp\u00e9rimentale est men\u00e9e sur un cristal phononique compos\u00e9 d\u2019un assemblage d\u2019anneaux pi\u00e9zo\u00e9lectriques s\u00e9par\u00e9s par des \u00e9lectrodes. Les \u00e9lectrodes de l\u2019assemblage peuvent \u00eatre reli\u00e9es \u00e0 la masse ou laiss\u00e9es en condition de potentiel flottant. Des premi\u00e8res mesures par vibrom\u00e9trie et par relev\u00e9s de potentiels \u00e9lectriques permettent de v\u00e9rifier l\u2019apparition de bandes interdites lorsque les \u00e9lectrodes sont reli\u00e9es \u00e0 la masse p\u00e9riodiquement. Ces r\u00e9sultats exp\u00e9rimentaux sont confront\u00e9s \u00e0 des simulations par \u00e9l\u00e9ments finis pour pr\u00e9ciser l\u2019interpr\u00e9tation des diff\u00e9rents effets observ\u00e9s. Les mises \u00e0 la masse p\u00e9riodiques sont ensuite d\u00e9cal\u00e9es dans le temps \u00e0 des vitesses de modulation subsoniques. L\u2019\u00e9volution des courbes de dispersion avec la vitesse de modulation est analys\u00e9e et de nouveau compar\u00e9e \u00e0 des r\u00e9sultats de simulations par \u00e9l\u00e9ments finis incluant la modulation. Les exp\u00e9riences permettent de constater un d\u00e9calage asym\u00e9trique des bandes interdites et ainsi une propagation non-r\u00e9ciproque des ondes \u00e9lastiques. La propagation des ondes dans le syst\u00e8me est ensuite \u00e9tudi\u00e9e pour des vitesses de modulation plus rapides, correspondant successivement \u00e0 des r\u00e9gimes sonique et supersonique. L\u2019\u00e9tude des courbes de dispersion pour des vitesses correspondant au r\u00e9gime sonique permet de constater des interactions entre plusieurs modes de propagation.<\/p>\n<h5>Abstract:<\/h5>\n<p>Wave propagation in media with spatio-temporally modulated material parameters has been widely studied for several years. Nevertheless, simple experimental realizations have been difficult to achieve, as significant and fast parameter modifications are difficult to obtain. This thesis focuses on modulated piezoelectric phononic crystals that avoid this pitfall. Indeed, it is possible in this type of system to influence the propagation of acoustic waves by simply modulating the electrical conditions on a set of electrodes. Since the modulation is performed on electrical conditions, it is possible to control it through electrical circuits, thus simplifying its experimental implementation and allowing to reach high modulation speeds. The effects generated are similar to those observed for a modulation of material parameters. For example, a continuous shift of a set of grounding conditions allows to obtain a non-reciprocal behavior and directional Bragg band gaps, typical of space-time modulated media. An experimental study is conducted on a phononic crystal composed of an assembly of piezoelectric rings separated by electrodes. The electrodes of the assembly can be grounded or left in a floating potential condition. First measurements by vibrometry and electrical potentials allow to verify the appearance of band gaps when the electrodes are periodically connected to the ground. These experimental results are confronted with finite element simulations to clarify the interpretation of the different effects observed. The periodic groundings are then shifted in time at subsonic modulation rates. The evolution of the dispersion curves with the modulation speed is analyzed and again compared to the results of finite element simulations including the modulation. The experiments show an asymmetric shift of the band gaps and thus a non-reciprocal propagation of the elastic waves. The wave propagation in the system is then studied for faster modulation speeds, corresponding successively to sonic and supersonic regimes. The study of the dispersion curves for speeds corresponding to the sonic regime allows to observe interactions between several propagation modes.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[316],"tags":[],"class_list":["post-55707","post","type-post","status-publish","format-standard","hentry","category-theses-2022"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/55707","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=55707"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/55707\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=55707"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=55707"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=55707"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}