{"id":63706,"date":"2022-04-26T04:48:26","date_gmt":"2022-04-26T09:48:26","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/is-there-a-way-through-which-a-piezo-transducer-can-drive-with-a-square-wave\/"},"modified":"2025-01-27T06:14:39","modified_gmt":"2025-01-27T11:14:39","slug":"is-there-a-way-through-which-a-piezo-transducer-can-drive-with-a-square-wave","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/is-there-a-way-through-which-a-piezo-transducer-can-drive-with-a-square-wave\/","title":{"rendered":"\u0158\u00edzen\u00ed piezoelektrick\u00e9ho m\u011bni\u010de \u010dtvercovou vlnou"},"content":{"rendered":"<p>Piezoelektrick\u00e9 m\u011bni\u010de jsou \u0161iroce pou\u017e\u00edv\u00e1ny v mnoha aplikac\u00edch, od zapalov\u00e1n\u00ed v zapa\u013eova\u010d\u00edch a\u017e po ultrazvukov\u00e9 \u010distic\u00ed syst\u00e9my.  \u010casto se pou\u017e\u00edvaj\u00ed s sinusov\u00fdmi vlnami, ale ot\u00e1zka, zda je mo\u017en\u00e9 je efektivn\u011b \u0159\u00eddit \u010dtvercovou vlnou, je relevantn\u00ed a zaslou\u017e\u00ed si podrobn\u011bj\u0161\u00ed prozkoum\u00e1n\u00ed.<\/p>\n<h3>Charakteristika piezoelektrick\u00fdch m\u011bni\u010d\u016f a jejich odezva na r\u016fzn\u00e9 vlnov\u00e9 formy<\/h3>\n<p>Piezoelektrick\u00e9 m\u011bni\u010de funguj\u00ed na principu piezoelektrick\u00e9ho efektu, kdy mechanick\u00e1 deformace krystalu generuje elektrick\u00e9 nap\u011bt\u00ed a naopak.  P\u0159i aplikaci st\u0159\u00eddav\u00e9ho nap\u011bt\u00ed se krystal periodicky deformuje, \u010d\u00edm\u017e generuje mechanick\u00e9 vibrace.  Odezva m\u011bni\u010de na r\u016fzn\u00e9 vlnov\u00e9 formy se li\u0161\u00ed. Sinusov\u00e1 vlna generuje \u010dist\u00fd t\u00f3n s definovanou frekvenc\u00ed a amplitudou. \u010ctvercov\u00e1 vlna, skl\u00e1daj\u00edc\u00ed se z harmonick\u00fdch frekvenc\u00ed n\u00e1sobk\u016f z\u00e1kladn\u00ed frekvence,  vytv\u00e1\u0159\u00ed slo\u017eit\u011bj\u0161\u00ed vibra\u010dn\u00ed obrazec.  To m\u016f\u017ee v\u00e9st k ne\u017e\u00e1douc\u00edm rezonan\u010dn\u00edm jev\u016fm a ni\u017e\u0161\u00ed efektivit\u011b p\u0159enosu energie.<\/p>\n<h3>Vliv harmonick\u00fdch frekvenc\u00ed \u010dtvercov\u00e9 vlny<\/h3>\n<p>\u010ctvercov\u00e1 vlna nen\u00ed \u010dist\u00fd t\u00f3n, ale sp\u00ed\u0161e sou\u010det nekone\u010dn\u00e9 \u0159ady lich\u00fdch harmonick\u00fdch frekvenc\u00ed.  To znamen\u00e1, \u017ee piezoelektrick\u00fd m\u011bni\u010d bude vibrovat nejen na z\u00e1kladn\u00ed frekvenci, ale i na jej\u00edch n\u00e1sobc\u00edch.  Pokud se n\u011bkter\u00e1 z t\u011bchto harmonick\u00fdch frekvenc\u00ed shoduje s rezonan\u010dn\u00ed frekvenc\u00ed m\u011bni\u010de, m\u016f\u017ee doj\u00edt k v\u00fdrazn\u00e9mu zes\u00edlen\u00ed vibrac\u00ed.  Naopak, pokud se harmonick\u00e9 frekvence nach\u00e1zej\u00ed daleko od rezonan\u010dn\u00ed frekvence, jejich p\u0159\u00edsp\u011bvek k celkov\u00e9 vibrace bude minim\u00e1ln\u00ed.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Harmonick\u00e1 frekvence<\/th>\n<th>Amplituda (relativn\u00ed)<\/th>\n<th>Vliv na vibraci<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>f0 (z\u00e1kladn\u00ed)<\/td>\n<td>1<\/td>\n<td>Dominantn\u00ed<\/td>\n<\/tr>\n<tr>\n<td>3f0<\/td>\n<td>1\/3<\/td>\n<td>V\u00fdznamn\u00fd, pokud bl\u00edzk\u00fd rezonanci<\/td>\n<\/tr>\n<tr>\n<td>5f0<\/td>\n<td>1\/5<\/td>\n<td>M\u00e9n\u011b v\u00fdznamn\u00fd<\/td>\n<\/tr>\n<tr>\n<td>7f0<\/td>\n<td>1\/7<\/td>\n<td>Minim\u00e1ln\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Mo\u017enosti \u0159\u00edzen\u00ed piezoelektrick\u00e9ho m\u011bni\u010de \u010dtvercovou vlnou<\/h3>\n<p>P\u0159esto\u017ee \u010dtvercov\u00e1 vlna generuje slo\u017eit\u011bj\u0161\u00ed vibra\u010dn\u00ed obrazec, lze piezoelektrick\u00fd m\u011bni\u010d \u0159\u00eddit i touto vlnovou formou.  Kl\u00ed\u010dem je spr\u00e1vn\u00fd v\u00fdb\u011br z\u00e1kladn\u00ed frekvence.  Je nutn\u00e9 zvolit frekvenci, kter\u00e1 je co nejbl\u00ed\u017ee rezonan\u010dn\u00ed frekvenci m\u011bni\u010de, aby se maximalizovala efektivita p\u0159enosu energie.  D\u00e1le je d\u016fle\u017eit\u00e9 zv\u00e1\u017eit, zda ne\u017e\u00e1douc\u00ed harmonick\u00e9 frekvence zp\u016fsob\u00ed probl\u00e9my v dan\u00e9 aplikaci. V n\u011bkter\u00fdch p\u0159\u00edpadech m\u016f\u017ee b\u00fdt nutn\u00e9 pou\u017e\u00edt filtry pro potla\u010den\u00ed ne\u017e\u00e1douc\u00edch harmonick\u00fdch frekvenc\u00ed.  Pro aplikace vy\u017eaduj\u00edc\u00ed p\u0159esnou kontrolu amplitudy a frekvence vibrac\u00ed je v\u0161ak sinusov\u00e1 vlna st\u00e1le preferovan\u011bj\u0161\u00ed.<\/p>\n<h3>Srovn\u00e1n\u00ed sinusov\u00e9 a \u010dtvercov\u00e9 vlny pro \u0159\u00edzen\u00ed piezoelektrick\u00e9ho m\u011bni\u010de<\/h3>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Vlastnost<\/th>\n<th>Sinusov\u00e1 vlna<\/th>\n<th>\u010ctvercov\u00e1 vlna<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u010cistota t\u00f3nu<\/td>\n<td>Vysok\u00e1<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<\/tr>\n<tr>\n<td>Efektivita p\u0159enosu energie<\/td>\n<td>Vysok\u00e1 (p\u0159i rezonanci)<\/td>\n<td>Ni\u017e\u0161\u00ed (mo\u017enost rezonanc\u00ed na harmonick\u00fdch)<\/td>\n<\/tr>\n<tr>\n<td>Slo\u017eitost \u0159\u00edzen\u00ed<\/td>\n<td>Ni\u017e\u0161\u00ed<\/td>\n<td>Vy\u0161\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Aplikace<\/td>\n<td>Precizn\u00ed aplikace, ultrazvukov\u00e9 zobrazov\u00e1n\u00ed<\/td>\n<td>Aplikace, kde \u010distota t\u00f3nu nen\u00ed kritick\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee je mo\u017en\u00e9 \u0159\u00eddit piezoelektrick\u00fd m\u011bni\u010d \u010dtvercovou vlnou, ale je nutn\u00e9 pe\u010dliv\u011b zv\u00e1\u017eit vliv harmonick\u00fdch frekvenc\u00ed a zvolit vhodnou z\u00e1kladn\u00ed frekvenci.  V aplikac\u00edch, kde je po\u017eadov\u00e1na vysok\u00e1 p\u0159esnost a \u010distota t\u00f3nu, z\u016fst\u00e1v\u00e1 sinusov\u00e1 vlna st\u00e1le nejlep\u0161\u00edm \u0159e\u0161en\u00edm.  Nicm\u00e9n\u011b, v n\u011bkter\u00fdch aplikac\u00edch, kde je po\u017eadov\u00e1na sp\u00ed\u0161e s\u00edla impulsu ne\u017e \u010distota t\u00f3nu, m\u016f\u017ee b\u00fdt \u010dtvercov\u00e1 vlna efektivn\u00ed a jednodu\u0161\u0161\u00ed pro implementaci.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Piezoelektrick\u00e9 m\u011bni\u010de jsou \u0161iroce pou\u017e\u00edv\u00e1ny v mnoha aplikac\u00edch, od zapalov\u00e1n\u00ed v zapa\u013eova\u010d\u00edch a\u017e po ultrazvukov\u00e9 \u010distic\u00ed syst\u00e9my. \u010casto se pou\u017e\u00edvaj\u00ed s sinusov\u00fdmi vlnami, ale ot\u00e1zka, zda je mo\u017en\u00e9 je efektivn\u011b \u0159\u00eddit \u010dtvercovou vlnou, je relevantn\u00ed a zaslou\u017e\u00ed si podrobn\u011bj\u0161\u00ed prozkoum\u00e1n\u00ed. Charakteristika piezoelektrick\u00fdch m\u011bni\u010d\u016f a jejich odezva na r\u016fzn\u00e9 vlnov\u00e9 formy Piezoelektrick\u00e9 m\u011bni\u010de funguj\u00ed na principu<\/p>\n","protected":false},"author":1,"featured_media":24651,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-63706","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\/63706","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=63706"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/63706\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/24651"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=63706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=63706"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=63706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}