{"id":122,"date":"2017-07-28T08:36:19","date_gmt":"2017-07-28T08:36:19","guid":{"rendered":"http:\/\/pafec.kevinit.co.uk\/?page_id=122"},"modified":"2017-08-22T07:24:04","modified_gmt":"2017-08-22T07:24:04","slug":"1-3-composites","status":"publish","type":"page","link":"https:\/\/pafec.kevinit.co.uk\/index.php\/pafec-vibroacoustics-application-areas\/underwater-acoustics\/array-design\/1-3-composites\/","title":{"rendered":"1-3 Composites"},"content":{"rendered":"<p>The hydrophone consists of parallel piezoelectric rods embedded in a matrix, sandwiched between lower and upper lids. As the hydrophone is symmetric about the x=0 and y=0 planes a quarter model is sufficient.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-567\" src=\"\/wp-content\/uploads\/2017\/08\/1-3-composite-01-587x355.gif\" alt=\"\" width=\"587\" height=\"355\" \/><\/p>\n<p style=\"text-align: center;\">1-3 composite model<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-568\" src=\"\/wp-content\/uploads\/2017\/08\/1-3-composite-02-578x360.gif\" alt=\"\" width=\"578\" height=\"360\" \/><\/p>\n<p style=\"text-align: center;\">1-3 composite model (without lids)<\/p>\n<p>&nbsp;<\/p>\n<p>The PZT5H piezoelectric ceramic rods are modelled with 3D piezoelectric elements.<\/p>\n<p>The matrix and lids are modelled with 3D isoparametric stress elements.<\/p>\n<p>The water surrounding the structure is modelled with an acoustic boundary element mesh consisting of eight noded quadrilateral patches.<\/p>\n<p>This example considers the receive (passive) case for the transducer. Four pair of electrodes have been defined, each a 4 x 4 grid of piezoelectric rods. The earthed electrode of each pair is at the lower z-coordinate.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-569\" src=\"\/wp-content\/uploads\/2017\/08\/1-3-composite-03-578x355.gif\" alt=\"\" width=\"578\" height=\"355\" \/><\/p>\n<p style=\"text-align: center;\">1-3 composite model (acoustic elements)<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-570\" src=\"\/wp-content\/uploads\/2017\/08\/1-3-composite-17-538x378.gif\" alt=\"\" width=\"538\" height=\"378\" \/><\/p>\n<p style=\"text-align: center;\">Pressure amplitude distribution at 30000Hz.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-571\" src=\"\/wp-content\/uploads\/2017\/08\/1-3-composite-18-538x378.gif\" alt=\"\" width=\"538\" height=\"378\" \/><\/p>\n<p style=\"text-align: center;\">Displaced shape of structure at 30000Hz.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-572\" src=\"\/wp-content\/uploads\/2017\/08\/1-3-composite-19-538x378.gif\" alt=\"\" width=\"538\" height=\"378\" \/><\/p>\n<p style=\"text-align: center;\">Displaced shape of structure at 30000Hz.<br \/>\n(piezoelectric rods only)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The hydrophone consists of parallel piezoelectric rods embedded in a matrix, sandwiched between lower and upper lids. As the hydrophone[&#8230;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":112,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/122"}],"collection":[{"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=122"}],"version-history":[{"count":5,"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/122\/revisions"}],"predecessor-version":[{"id":729,"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/122\/revisions\/729"}],"up":[{"embeddable":true,"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/112"}],"wp:attachment":[{"href":"https:\/\/pafec.kevinit.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}