{"id":515,"date":"2022-03-19T23:48:21","date_gmt":"2022-03-19T23:48:21","guid":{"rendered":"https:\/\/2022.robocupjunior.eu\/rcj\/?page_id=515"},"modified":"2022-05-31T17:53:07","modified_gmt":"2022-05-31T17:53:07","slug":"ofi-19-chladni-plates","status":"publish","type":"page","link":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/workshops\/sound\/ofi-19-chladni-plates\/","title":{"rendered":"Chladni Plates"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:80%\"><figure class=\"wp-block-post-featured-image\"><img loading=\"lazy\" decoding=\"async\" width=\"660\" height=\"450\" src=\"https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/harvardchladni.jpg\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" style=\"object-fit:cover;\" srcset=\"https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/harvardchladni.jpg 660w, https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/harvardchladni-300x205.jpg 300w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;flex-basis:20%\">\n<!-- START Kaya QR Code Generator --><div class=\"wpkqcg_qrcode_wrapper\"><input type=\"hidden\" id=\"wpkqcg_qrcode_outputimg_4069d6e5d5b308885_ecclevel\" value=\"L\" \/><input type=\"hidden\" id=\"wpkqcg_qrcode_outputimg_4069d6e5d5b308885_size\" value=\"\" \/><input type=\"hidden\" id=\"wpkqcg_qrcode_outputimg_4069d6e5d5b308885_color\" value=\"\" \/><input type=\"hidden\" id=\"wpkqcg_qrcode_outputimg_4069d6e5d5b308885_bgcolor\" value=\"\" \/><input type=\"hidden\" id=\"wpkqcg_qrcode_outputimg_4069d6e5d5b308885_content\" value=\"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/pages\/515\" \/><img decoding=\"async\" src=\"\" id=\"wpkqcg_qrcode_outputimg_4069d6e5d5b308885\" alt=\"QR Code\" class=\"wpkqcg_qrcode\" style=\"width: auto; height: auto; max-width: 100%;\" ><div style=\"clear: none;\"><\/div><\/div><!-- END Kaya QR Code Generator -->\n<\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-post-title\">Chladni Plates<\/h2>\n\n\n<p>\u201cChladni\u2019s Plates\u201d, enable us to visualize the effects of vibrations on mechanical surfaces.<\/p>\n\n\n\n<p><strong>Components:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Sand<\/li><li>Metalic plate<\/li><li>Sound generator<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Working-Principle:\">Working Principle:<\/h2>\n\n\n\n<p>The scientist, musician, and musical instrument builder Ernst Chladni (1756-1827), produced Chladni plates in the late 18th century to demonstrate the complex patterns of standing wave vibrations that can occur in two-dimensional objects.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"236\" height=\"284\" src=\"https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/forming-chladni-patterns-technique.png\" alt=\"\" class=\"wp-image-520\"\/><\/figure>\n\n\n\n<p>The iron plates were made to vibrate by stroking them with a violin bow. When a plate is stroked, it will resound at one of its natural frequencies. The experimenter next sprinkles fine sand on the plate, which bounces around until it settles at nodal points (areas of zero movement), resulting in elaborate patterns like the one shown below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-medium\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni-pattern-1-300x300.png\" alt=\"\" class=\"wp-image-518\" srcset=\"https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni-pattern-1-300x300.png 300w, https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni-pattern-1-150x150.png 150w, https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni-pattern-1-768x768.png 768w, https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni-pattern-1.png 1000w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>In his book Die Akustic, he describes this visualisation approach (published in 1802).<\/p>\n\n\n\n<p>In theory, any plate can have an infinite number of vibration modes, each of which corresponds to a different sound frequency. Each mode generates a distinct pattern, which grows in complexity as the vibration frequency rises. The shape of the patterns created on a given plate is determined by a variety of parameters, including the plate&#8217;s shape. The accompanying graphic from Chladni&#8217;s book gives an idea of the range of conceivable patterns.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"312\" height=\"380\" src=\"https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni_illustration.jpg\" alt=\"\" class=\"wp-image-517\" srcset=\"https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni_illustration.jpg 312w, https:\/\/2022.robocupjunior.eu\/rcj\/wp-content\/uploads\/2022\/03\/chladni_illustration-246x300.jpg 246w\" sizes=\"auto, (max-width: 312px) 100vw, 312px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Instructions:\">Instructions:<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>Place a thin layer of sand on top of the plate<\/li><li>Generate sound with different frequencies<\/li><li>Observe the different patterns<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"Links:.1\">Links:<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=lRFysSAxWxI\">Chladni Plates<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=CR_XL192wXw\">Chladni Figures &#8211; random couscous snaps into beautiful patterns<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=tFAcYruShow\">Cymatics: Chladni Plate &#8211; Sound, Vibration and Sand<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.whipplemuseum.cam.ac.uk\/explore-whipple-collections\/acoustics\/ernst-chladni-physicist-musician-and-musical-instrument-maker\">Ernst Chladni: Physicist, Musician and Musical Instrument Maker<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/publicdomainreview.org\/collection\/chladni-figures-1787\">Chladni Figures (1787)<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/americanhistory.si.edu\/science\/chladni.htm\">Smithsonian &#8211; Chladni Plates<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/blogs.scientificamerican.com\/but-seriously\/chladni-figures-amazing-resonance-experiment\/\">Chladni Figures: Amazing Resonance Experiment<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.comsol.com\/blogs\/how-do-chladni-plates-make-it-possible-to-visualize-sound\/\">How Do Chladni Plates Make It Possible to Visualize Sound?<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/web2.ph.utexas.edu\/~coker2\/index.files\/chladni.htm\">Physics 341 Illusions<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u201cChladni\u2019s Plates\u201d, enable us to visualize the effects of vibrations on mechanical surfaces. Components: Sand Metalic plate Sound generator Working Principle: The scientist, musician, and musical instrument builder Ernst Chladni (1756-1827), produced Chladni plates in the late 18th century to demonstrate the complex patterns of standing wave vibrations that can occur in two-dimensional objects. The [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":519,"parent":229,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-515","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/pages\/515","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/comments?post=515"}],"version-history":[{"count":3,"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/pages\/515\/revisions"}],"predecessor-version":[{"id":975,"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/pages\/515\/revisions\/975"}],"up":[{"embeddable":true,"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/pages\/229"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/media\/519"}],"wp:attachment":[{"href":"https:\/\/2022.robocupjunior.eu\/rcj\/index.php\/wp-json\/wp\/v2\/media?parent=515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}