{"id":63406,"date":"2022-06-17T17:00:42","date_gmt":"2022-06-17T22:00:42","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/piezo-ceramics-how-can-damping-be-explained\/"},"modified":"2025-01-27T06:14:52","modified_gmt":"2025-01-27T11:14:52","slug":"piezo-ceramics-how-can-damping-be-explained","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/piezo-ceramics-how-can-damping-be-explained\/","title":{"rendered":"Tlumen\u00ed v piezoelektrick\u00e9 keramice: vysv\u011btlen\u00ed"},"content":{"rendered":"<p>Piezokeraamika je materi\u00e1l s jedine\u010dn\u00fdmi vlastnostmi, kter\u00e9 j\u00ed umo\u017e\u0148uj\u00ed p\u0159ev\u00e1d\u011bt mechanickou energii na energii elektrickou a naopak. Tato vlastnost, zn\u00e1m\u00e1 jako piezoelektrick\u00fd efekt, je \u0161iroce vyu\u017e\u00edv\u00e1na v r\u016fzn\u00fdch aplikac\u00edch, od zapalova\u010d\u016f po ultrazvukov\u00e9 sn\u00edma\u010de.  Nicm\u00e9n\u011b, pro mnoho aplikac\u00ed je d\u016fle\u017eit\u00e9 pochopit a ovl\u00e1dat tlumen\u00ed vibrac\u00ed v piezokeraamick\u00fdch struktur\u00e1ch.  Tlumen\u00ed je proces, kter\u00fd sni\u017euje amplitudu vibrac\u00ed v \u010dase.  N\u00e1sleduj\u00edc\u00ed text se zam\u011b\u0159uje na r\u016fzn\u00e9 mechanismy tlumen\u00ed v piezokeraamice a jejich vliv na funk\u010dnost za\u0159\u00edzen\u00ed.<\/p>\n<p>Mechanismy tlumen\u00ed v piezokeraamice<\/p>\n<p>Tlumen\u00ed vibrac\u00ed v piezokeraamice je komplexn\u00ed jev, ovlivn\u011bn\u00fd \u0159adou faktor\u016f. Mezi hlavn\u00ed mechanismy pat\u0159\u00ed:<\/p>\n<ul>\n<li>\n<p><strong>Mechanick\u00e9 tlumen\u00ed:<\/strong> Tento typ tlumen\u00ed je zp\u016fsoben vnit\u0159n\u00ed strukturou materi\u00e1lu.  Mikrostrukturn\u00ed nedokonalosti, jako jsou p\u00f3ry, dislokace a hranice zrn, rozptyluj\u00ed energii vibrac\u00ed a sni\u017euj\u00ed amplitudu kmit\u00e1n\u00ed.  Tento typ tlumen\u00ed je obecn\u011b z\u00e1visl\u00fd na frekvenci a teplot\u011b.<\/p>\n<\/li>\n<li>\n<p><strong>Elektro-mechanick\u00e9 tlumen\u00ed:<\/strong>  Piezokeraamika vykazuje elektro-mechanick\u00e9 tlumen\u00ed, kter\u00e9 je zp\u016fsobeno interakc\u00ed mezi mechanick\u00fdmi vibracemi a elektrick\u00fdm polem.  Elektrick\u00e9 pole m\u016f\u017ee bu\u010f zvy\u0161ovat, nebo sni\u017eovat tlumen\u00ed, v z\u00e1vislosti na konfiguraci a aplikovan\u00e9m nap\u011bt\u00ed.  Tento jev se vyu\u017e\u00edv\u00e1 v n\u011bkter\u00fdch aplikac\u00edch k aktivn\u00edmu \u0159\u00edzen\u00ed tlumen\u00ed.<\/p>\n<\/li>\n<li>\n<p><strong>Dielektrick\u00e9 ztr\u00e1ty:<\/strong>  Dielektrick\u00e9 ztr\u00e1ty jsou zp\u016fsobeny disipac\u00ed energie v dielektrick\u00e9 matrici piezokeraamiky.  Tyto ztr\u00e1ty jsou z\u00e1visl\u00e9 na frekvenci a teplot\u011b a vedou k tlumen\u00ed vibrac\u00ed.<\/p>\n<\/li>\n<li>\n<p><strong>Vn\u011bj\u0161\u00ed tlumen\u00ed:<\/strong>  Vn\u011bj\u0161\u00ed tlumen\u00ed je zp\u016fsobeno interakc\u00ed piezokeraamiky s okoln\u00edm prost\u0159ed\u00edm.  To zahrnuje tlumen\u00ed zp\u016fsoben\u00e9 vzduchem, kapalinou nebo pevn\u00fdmi materi\u00e1ly, se kter\u00fdmi je piezokeraamika v kontaktu.  Tento typ tlumen\u00ed se obvykle zvy\u0161uje s rostouc\u00ed plochou styku a viskozitou okoln\u00edho prost\u0159ed\u00ed.<\/p>\n<\/li>\n<\/ul>\n<p>Vliv tlumen\u00ed na vlastnosti piezokeraamiky<\/p>\n<p>\u00darove\u0148 tlumen\u00ed v\u00fdrazn\u011b ovliv\u0148uje vlastnosti piezokeraamick\u00fdch sou\u010d\u00e1stek a jejich v\u00fdkon.  N\u00edzk\u00e9 tlumen\u00ed vede k vysok\u00e9 rezonan\u010dn\u00ed frekvenci a dlouh\u00e9 dob\u011b dozn\u00edv\u00e1n\u00ed vibrac\u00ed, zat\u00edmco vysok\u00e9 tlumen\u00ed vede k ni\u017e\u0161\u00ed rezonan\u010dn\u00ed frekvenci a kr\u00e1tk\u00e9 dob\u011b dozn\u00edv\u00e1n\u00ed.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Typ tlumen\u00ed<\/th>\n<th>Vliv na rezonan\u010dn\u00ed frekvenci<\/th>\n<th>Doba dozn\u00edv\u00e1n\u00ed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>N\u00edzk\u00e9<\/td>\n<td>Vysok\u00e1<\/td>\n<td>Dlouh\u00e1<\/td>\n<\/tr>\n<tr>\n<td>Vysok\u00e9<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<td>Kr\u00e1tk\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>V n\u011bkter\u00fdch aplikac\u00edch, jako je ultrazvukov\u00e9 \u010di\u0161t\u011bn\u00ed nebo sva\u0159ov\u00e1n\u00ed, je \u017e\u00e1douc\u00ed vysok\u00e9 tlumen\u00ed, aby se minimalizovaly ne\u017e\u00e1douc\u00ed vibrace a zlep\u0161il se v\u00fdkon. V jin\u00fdch aplikac\u00edch, nap\u0159\u00edklad p\u0159i konstrukci rezon\u00e1tor\u016f, je naopak \u017e\u00e1douc\u00ed n\u00edzk\u00e9 tlumen\u00ed pro dosa\u017een\u00ed vysok\u00e9 citlivosti a p\u0159esnosti.<\/p>\n<p>Metody \u0159\u00edzen\u00ed tlumen\u00ed<\/p>\n<p>Existuje n\u011bkolik metod pro \u0159\u00edzen\u00ed tlumen\u00ed v piezokeraamice. Mezi n\u011b pat\u0159\u00ed:<\/p>\n<ul>\n<li>\n<p><strong>Modifikace materi\u00e1lu:<\/strong>  Zm\u011bna slo\u017een\u00ed materi\u00e1lu a technologie v\u00fdroby m\u016f\u017ee ovlivnit vnit\u0159n\u00ed mechanick\u00e9 tlumen\u00ed.  Nap\u0159\u00edklad, p\u0159id\u00e1n\u00ed ur\u010dit\u00fdch p\u0159\u00edsad m\u016f\u017ee zv\u00fd\u0161it viskozitu materi\u00e1lu a t\u00edm i tlumen\u00ed.<\/p>\n<\/li>\n<li>\n<p><strong>Modifikace geometrie:<\/strong>  Zm\u011bna tvaru a rozm\u011br\u016f piezokeraamick\u00e9 sou\u010d\u00e1stky ovliv\u0148uje jej\u00ed rezonan\u010dn\u00ed frekvenci a dobu dozn\u00edv\u00e1n\u00ed.<\/p>\n<\/li>\n<li>\n<p><strong>Aktivn\u00ed tlumen\u00ed:<\/strong>  Pomoc\u00ed zp\u011btn\u00e9 vazby a \u0159\u00eddic\u00edho syst\u00e9mu lze aktivn\u011b kompenzovat vibrace a sni\u017eovat amplitudu kmit\u00e1n\u00ed.  Toto je obzvl\u00e1\u0161t\u011b u\u017eite\u010dn\u00e9 v aplikac\u00edch, kde se vy\u017eaduje vysok\u00e1 p\u0159esnost a stabilita.<\/p>\n<\/li>\n<\/ul>\n<p>Z\u00e1v\u011br<\/p>\n<p>Tlumen\u00ed vibrac\u00ed v piezokeraamice je komplexn\u00ed jev, kter\u00fd ovliv\u0148uje mnoho aspekt\u016f jej\u00edho chov\u00e1n\u00ed a v\u00fdkonu.  Pochopen\u00ed r\u016fzn\u00fdch mechanism\u016f tlumen\u00ed a metod pro jejich \u0159\u00edzen\u00ed je kl\u00ed\u010dov\u00e9 pro optimalizaci n\u00e1vrhu a funkce piezokeraamick\u00fdch za\u0159\u00edzen\u00ed v \u0161irok\u00e9 \u0161k\u00e1le aplikac\u00ed.  V\u00fdb\u011br vhodn\u00e9 strategie pro \u0159\u00edzen\u00ed tlumen\u00ed z\u00e1vis\u00ed na specifick\u00fdch po\u017eadavc\u00edch dan\u00e9 aplikace a kompromisu mezi po\u017eadovanou rezonan\u010dn\u00ed frekvenc\u00ed a dobou dozn\u00edv\u00e1n\u00ed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Piezokeraamika je materi\u00e1l s jedine\u010dn\u00fdmi vlastnostmi, kter\u00e9 j\u00ed umo\u017e\u0148uj\u00ed p\u0159ev\u00e1d\u011bt mechanickou energii na energii elektrickou a naopak. Tato vlastnost, zn\u00e1m\u00e1 jako piezoelektrick\u00fd efekt, je \u0161iroce vyu\u017e\u00edv\u00e1na v r\u016fzn\u00fdch aplikac\u00edch, od zapalova\u010d\u016f po ultrazvukov\u00e9 sn\u00edma\u010de. Nicm\u00e9n\u011b, pro mnoho aplikac\u00ed je d\u016fle\u017eit\u00e9 pochopit a ovl\u00e1dat tlumen\u00ed vibrac\u00ed v piezokeraamick\u00fdch struktur\u00e1ch. Tlumen\u00ed je proces, kter\u00fd sni\u017euje amplitudu vibrac\u00ed<\/p>\n","protected":false},"author":1,"featured_media":1238,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-63406","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/63406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/comments?post=63406"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/63406\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/1238"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=63406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=63406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=63406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}