{"id":63541,"date":"2022-05-25T05:19:24","date_gmt":"2022-05-25T10:19:24","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/does-the-motion-of-a-piezo-actuator-actually-repeat-itself\/"},"modified":"2025-01-27T06:04:50","modified_gmt":"2025-01-27T11:04:50","slug":"does-the-motion-of-a-piezo-actuator-actually-repeat-itself","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/does-the-motion-of-a-piezo-actuator-actually-repeat-itself\/","title":{"rendered":"Opakovatelnost pohybu piezoelektrick\u00e9ho aktu\u00e1toru: fakta a limity"},"content":{"rendered":"

Piezoelektrick\u00e9 aktu\u00e1tory nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oborech, od mikroskopie po automobilov\u00fd pr\u016fmysl. Jejich kl\u00ed\u010dovou vlastnost\u00ed je schopnost p\u0159esn\u00e9ho a rychl\u00e9ho pohybu, ale ot\u00e1zkou z\u016fst\u00e1v\u00e1, zda je tento pohyb skute\u010dn\u011b reprodukovateln\u00fd, tj. zda se p\u0159i opakovan\u00e9m spou\u0161t\u011bn\u00ed aktu\u00e1toru pohybuje v\u017edy p\u0159esn\u011b stejn\u011b. Tato ot\u00e1zka je z\u00e1sadn\u00ed pro jejich spolehliv\u00e9 pou\u017eit\u00ed v aplikac\u00edch vy\u017eaduj\u00edc\u00edch vysokou p\u0159esnost a opakovatelnost.<\/p>\n

Vliv hystereze na opakovatelnost pohybu<\/h3>\n

Hystereze je jev, kdy odezva syst\u00e9mu z\u00e1vis\u00ed na jeho p\u0159edchoz\u00ed historii. U piezoelektrick\u00fdch aktu\u00e1tor\u016f se projevuje jako rozd\u00edl mezi k\u0159ivkou expanze a kontrakce p\u0159i zm\u011bn\u011b aplikovan\u00e9ho nap\u011bt\u00ed. To znamen\u00e1, \u017ee p\u0159i stejn\u00e9m aplikovan\u00e9m nap\u011bt\u00ed nebude aktu\u00e1tor v\u017edy v p\u0159esn\u011b stejn\u00e9 poloze, co\u017e sni\u017euje opakovatelnost pohybu. M\u00edra hystereze se li\u0161\u00ed v z\u00e1vislosti na materi\u00e1lu, geometrii a provozn\u00edch podm\u00ednk\u00e1ch aktu\u00e1toru.<\/p>\n\n\n\n\n\n\n\n\n
Faktor<\/th>\nVliv na hysterezi<\/th>\n<\/tr>\n<\/thead>\n
Materi\u00e1l piezoelektrika<\/td>\nVliv na velikost a tvar hysterezn\u00ed k\u0159ivky<\/td>\n<\/tr>\n
Geometrie aktu\u00e1toru<\/td>\nOvliv\u0148uje mechanick\u00e9 vlastnosti a t\u00edm i hysterezi<\/td>\n<\/tr>\n
Teplota<\/td>\nZm\u011bny teploty mohou v\u00fdrazn\u011b ovlivnit hysterezi<\/td>\n<\/tr>\n
Frekvence nap\u011bt\u00ed<\/td>\nVliv na rychlost odezvy a t\u00edm i hysterezi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Vliv st\u00e1rnut\u00ed materi\u00e1lu<\/h3>\n

St\u00e1rnut\u00ed piezoelektrick\u00e9ho materi\u00e1lu s \u010dasem vede ke zm\u011bn\u00e1m jeho vlastnost\u00ed, v\u010detn\u011b sn\u00ed\u017een\u00ed piezoelektrick\u00e9ho koeficientu a zv\u00fd\u0161en\u00ed hystereze. To se projev\u00ed zhor\u0161en\u00edm opakovatelnosti pohybu s rostouc\u00edm po\u010dtem cykl\u016f. Tento efekt je z\u00e1visl\u00fd na provozn\u00edch podm\u00ednk\u00e1ch a m\u016f\u017ee b\u00fdt zrychlen vysok\u00fdmi teplotami nebo vysokou frekvenc\u00ed provozu.<\/p>\n

Vliv vn\u011bj\u0161\u00edch faktor\u016f<\/h3>\n

Krom\u011b vlastnost\u00ed samotn\u00e9ho aktu\u00e1toru ovliv\u0148uj\u00ed opakovatelnost pohybu tak\u00e9 vn\u011bj\u0161\u00ed faktory, jako je teplota okol\u00ed, vlhkost a vibrace. Zm\u011bny t\u011bchto faktor\u016f mohou v\u00e9st k nep\u0159esnostem v poloze aktu\u00e1toru a sn\u00ed\u017een\u00ed opakovatelnosti. Precizn\u00ed regulace a kompenzace t\u011bchto vn\u011bj\u0161\u00edch faktor\u016f je kl\u00ed\u010dov\u00e1 pro dosa\u017een\u00ed vysok\u00e9 p\u0159esnosti a opakovatelnosti.<\/p>\n

Metody kompenzace a zlep\u0161en\u00ed opakovatelnosti<\/h3>\n

Existuje n\u011bkolik metod, jak zlep\u0161it opakovatelnost pohybu piezoelektrick\u00fdch aktu\u00e1tor\u016f. Pat\u0159\u00ed mezi n\u011b nap\u0159\u00edklad pou\u017eit\u00ed \u0159\u00eddic\u00edch syst\u00e9m\u016f s kompenzac\u00ed hystereze, precizn\u00ed kalibrace aktu\u00e1toru a optimalizace provozn\u00edch podm\u00ednek. Pou\u017eit\u00ed pokro\u010dil\u00fdch \u0159\u00eddic\u00edch algoritm\u016f umo\u017e\u0148uje kompenzovat vliv hystereze a dos\u00e1hnout vy\u0161\u0161\u00ed p\u0159esnosti pohybu.<\/p>\n

Z\u00e1v\u011br<\/h3>\n

Pohyb piezoelektrick\u00e9ho aktu\u00e1toru se sice neopakuje s absolutn\u00ed p\u0159esnost\u00ed, ale jeho opakovatelnost m\u016f\u017ee b\u00fdt v\u00fdznamn\u011b zlep\u0161ena vhodn\u00fdmi metodami. Vliv hystereze, st\u00e1rnut\u00ed materi\u00e1lu a vn\u011bj\u0161\u00edch faktor\u016f je nutn\u00e9 br\u00e1t v \u00favahu p\u0159i n\u00e1vrhu a provozu aplikac\u00ed, kter\u00e9 vy\u017eaduj\u00ed vysokou p\u0159esnost a spolehlivost. Pou\u017eit\u00ed modern\u00edch \u0159\u00eddic\u00edch syst\u00e9m\u016f a pe\u010dliv\u00e1 kontrola provozn\u00edch podm\u00ednek jsou kl\u00ed\u010dov\u00e9 pro dosa\u017een\u00ed optim\u00e1ln\u00ed opakovatelnosti pohybu piezoelektrick\u00fdch aktu\u00e1tor\u016f.<\/p>\n","protected":false},"excerpt":{"rendered":"

Piezoelektrick\u00e9 aktu\u00e1tory nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oborech, od mikroskopie po automobilov\u00fd pr\u016fmysl. Jejich kl\u00ed\u010dovou vlastnost\u00ed je schopnost p\u0159esn\u00e9ho a rychl\u00e9ho pohybu, ale ot\u00e1zkou z\u016fst\u00e1v\u00e1, zda je tento pohyb skute\u010dn\u011b reprodukovateln\u00fd, tj. zda se p\u0159i opakovan\u00e9m spou\u0161t\u011bn\u00ed aktu\u00e1toru pohybuje v\u017edy p\u0159esn\u011b stejn\u011b. Tato ot\u00e1zka je z\u00e1sadn\u00ed pro jejich spolehliv\u00e9 pou\u017eit\u00ed v aplikac\u00edch vy\u017eaduj\u00edc\u00edch vysokou p\u0159esnost<\/p>\n","protected":false},"author":1,"featured_media":4869,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-63541","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\/63541","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=63541"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/63541\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/4869"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=63541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=63541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=63541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}