{"id":53883,"date":"2022-09-13T03:30:03","date_gmt":"2022-09-13T08:30:03","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/piezo-ceramics-how-to-define-an-electric-field\/"},"modified":"2025-01-21T07:25:38","modified_gmt":"2025-01-21T12:25:38","slug":"piezo-ceramics-how-to-define-an-electric-field","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/piezo-ceramics-how-to-define-an-electric-field\/","title":{"rendered":"X\u00e1c \u0111\u1ecbnh \u0111i\u1ec7n tr\u01b0\u1eddng trong g\u1ed1m \u00e1p \u0111i\u1ec7n"},"content":{"rendered":"<p>V\u1eadt li\u1ec7u g\u1ed1m \u00e1p \u0111i\u1ec7n (piezo ceramics) s\u1edf h\u1eefu kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc th\u00e0nh n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y cho ph\u00e9p ch\u00fang \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c l\u0129nh v\u1ef1c nh\u01b0 c\u1ea3m bi\u1ebfn, thi\u1ebft b\u1ecb truy\u1ec1n \u0111\u1ed9ng, v\u00e0 t\u1ea1o s\u00f3ng si\u00eau \u00e2m. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh \u0111i\u1ec7n tr\u01b0\u1eddng trong g\u1ed1m \u00e1p \u0111i\u1ec7n l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 hi\u1ec3u v\u00e0 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a ch\u00fang. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o c\u00e1ch x\u00e1c \u0111\u1ecbnh \u0111i\u1ec7n tr\u01b0\u1eddng trong g\u1ed1m \u00e1p \u0111i\u1ec7n, bao g\u1ed3m c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng v\u00e0 ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n.<\/p>\n<h3>\u0110i\u1ec7n tr\u01b0\u1eddng v\u00e0 Hi\u1ec7u \u1ee9ng \u00c1p \u0111i\u1ec7n<\/h3>\n<p>Hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp x\u1ea3y ra khi m\u1ed9t l\u1ef1c c\u01a1 h\u1ecdc t\u00e1c \u0111\u1ed9ng l\u00ean v\u1eadt li\u1ec7u g\u1ed1m, t\u1ea1o ra m\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng b\u00ean trong n\u00f3. Ng\u01b0\u1ee3c l\u1ea1i, hi\u1ec7u \u1ee9ng \u00e1p \u0111i\u1ec7n ngh\u1ecbch x\u1ea3y ra khi m\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00ean v\u1eadt li\u1ec7u, g\u00e2y ra s\u1ef1 bi\u1ebfn d\u1ea1ng c\u01a1 h\u1ecdc. \u0110i\u1ec7n tr\u01b0\u1eddng n\u00e0y ch\u00ednh l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh \u0111\u1ebfn s\u1ef1 ph\u00e2n c\u1ef1c v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a g\u1ed1m \u00e1p \u0111i\u1ec7n.<\/p>\n<h3>C\u00e1c Y\u1ebfu t\u1ed1 \u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn \u0110i\u1ec7n tr\u01b0\u1eddng<\/h3>\n<p>C\u01b0\u1eddng \u0111\u1ed9 v\u00e0 h\u01b0\u1edbng c\u1ee7a \u0111i\u1ec7n tr\u01b0\u1eddng trong g\u1ed1m \u00e1p \u0111i\u1ec7n ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec1u y\u1ebfu t\u1ed1, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>H\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc:<\/strong> H\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt li\u1ec7u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e2n b\u1ed1 \u0111i\u1ec7n tr\u01b0\u1eddng.<\/li>\n<li><strong>V\u1eadt li\u1ec7u:<\/strong> C\u00e1c lo\u1ea1i g\u1ed1m \u00e1p \u0111i\u1ec7n kh\u00e1c nhau c\u00f3 h\u1eb1ng s\u1ed1 \u0111i\u1ec7n m\u00f4i v\u00e0 h\u1ec7 s\u1ed1 \u00e1p \u0111i\u1ec7n kh\u00e1c nhau, d\u1eabn \u0111\u1ebfn s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 \u0111i\u1ec7n tr\u01b0\u1eddng.<\/li>\n<li><strong>\u0110i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o:<\/strong> \u0110i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o l\u00e0 y\u1ebfu t\u1ed1 tr\u1ef1c ti\u1ebfp quy\u1ebft \u0111\u1ecbnh c\u01b0\u1eddng \u0111\u1ed9 \u0111i\u1ec7n tr\u01b0\u1eddng.<\/li>\n<li><strong>\u0110i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng:<\/strong> Nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u00e1p su\u1ea5t c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh ch\u1ea5t \u0111i\u1ec7n m\u00f4i c\u1ee7a v\u1eadt li\u1ec7u, t\u1eeb \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111i\u1ec7n tr\u01b0\u1eddng.<\/li>\n<\/ul>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Y\u1ebfu t\u1ed1<\/th>\n<th>\u1ea2nh h\u01b0\u1edfng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>H\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc<\/td>\n<td>Ph\u00e2n b\u1ed1 \u0111i\u1ec7n tr\u01b0\u1eddng<\/td>\n<\/tr>\n<tr>\n<td>V\u1eadt li\u1ec7u<\/td>\n<td>H\u1eb1ng s\u1ed1 \u0111i\u1ec7n m\u00f4i, h\u1ec7 s\u1ed1 \u00e1p \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o<\/td>\n<td>C\u01b0\u1eddng \u0111\u1ed9 \u0111i\u1ec7n tr\u01b0\u1eddng<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng<\/td>\n<td>T\u00ednh ch\u1ea5t \u0111i\u1ec7n m\u00f4i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Ph\u01b0\u01a1ng Ph\u00e1p X\u00e1c \u0111\u1ecbnh \u0110i\u1ec7n tr\u01b0\u1eddng<\/h3>\n<p>\u0110i\u1ec7n tr\u01b0\u1eddng trong g\u1ed1m \u00e1p \u0111i\u1ec7n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>Ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch:<\/strong> S\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc \u0111\u1ec3 t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u01b0\u1eddng d\u1ef1a tr\u00ean h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc v\u00e0 \u0111i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o.<\/li>\n<li><strong>Ph\u01b0\u01a1ng ph\u00e1p ph\u1ea7n t\u1eed h\u1eefu h\u1ea1n (FEM):<\/strong>  M\u00f4 ph\u1ecfng b\u1eb1ng m\u00e1y t\u00ednh \u0111\u1ec3 ph\u00e2n t\u00edch s\u1ef1 ph\u00e2n b\u1ed1 \u0111i\u1ec7n tr\u01b0\u1eddng trong v\u1eadt li\u1ec7u ph\u1ee9c t\u1ea1p.<\/li>\n<li><strong>Ph\u01b0\u01a1ng ph\u00e1p \u0111o l\u01b0\u1eddng tr\u1ef1c ti\u1ebfp:<\/strong> S\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng \u0111\u1ec3 \u0111o \u0111i\u1ec7n tr\u01b0\u1eddng tr\u00ean b\u1ec1 m\u1eb7t ho\u1eb7c b\u00ean trong v\u1eadt li\u1ec7u.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 v\u1ec1 T\u00ednh To\u00e1n \u0110i\u1ec7n tr\u01b0\u1eddng<\/h3>\n<p>\u0110\u1ed1i v\u1edbi m\u1ed9t t\u1ea5m g\u1ed1m \u00e1p \u0111i\u1ec7n h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi \u0111i\u1ec7n \u00e1p V \u0111\u1eb7t v\u00e0o gi\u1eefa hai m\u1eb7t \u0111\u1ed1i di\u1ec7n, \u0111i\u1ec7n tr\u01b0\u1eddng E c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh g\u1ea7n \u0111\u00fang b\u1eb1ng c\u00f4ng th\u1ee9c:  E = V\/d, trong \u0111\u00f3 d l\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa hai m\u1eb7t.<\/p>\n<h3>\u0110i\u1ec7n tr\u01b0\u1eddng trong \u1ee8ng d\u1ee5ng Si\u00eau \u00e2m<\/h3>\n<p>Trong c\u00e1c \u1ee9ng d\u1ee5ng si\u00eau \u00e2m, vi\u1ec7c ki\u1ec3m so\u00e1t \u0111i\u1ec7n tr\u01b0\u1eddng l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 t\u1ea1o ra s\u00f3ng si\u00eau \u00e2m v\u1edbi t\u1ea7n s\u1ed1 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 mong mu\u1ed1n.  V\u00ed d\u1ee5, trong c\u00e1c thi\u1ebft b\u1ecb si\u00eau \u00e2m l\u00e0m s\u1ea1ch, \u0111i\u1ec7n tr\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 t\u1ea1o ra c\u00e1c rung \u0111\u1ed9ng c\u01a1 h\u1ecdc m\u1ea1nh m\u1ebd, gi\u00fap lo\u1ea1i b\u1ecf b\u1ee5i b\u1ea9n.<\/p>\n<p>T\u00f3m l\u1ea1i, vi\u1ec7c x\u00e1c \u0111\u1ecbnh v\u00e0 ki\u1ec3m so\u00e1t \u0111i\u1ec7n tr\u01b0\u1eddng trong g\u1ed1m \u00e1p \u0111i\u1ec7n l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng d\u1ef1a tr\u00ean v\u1eadt li\u1ec7u n\u00e0y.  Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng v\u00e0 ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n \u0111i\u1ec7n tr\u01b0\u1eddng s\u1ebd gi\u00fap cho vi\u1ec7c thi\u1ebft k\u1ebf v\u00e0 s\u1eed d\u1ee5ng g\u1ed1m \u00e1p \u0111i\u1ec7n hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u1eadt li\u1ec7u g\u1ed1m \u00e1p \u0111i\u1ec7n (piezo ceramics) s\u1edf h\u1eefu kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng c\u01a1 h\u1ecdc th\u00e0nh n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y cho ph\u00e9p ch\u00fang \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c l\u0129nh v\u1ef1c nh\u01b0 c\u1ea3m bi\u1ebfn, thi\u1ebft b\u1ecb truy\u1ec1n \u0111\u1ed9ng, v\u00e0 t\u1ea1o s\u00f3ng si\u00eau \u00e2m. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh \u0111i\u1ec7n<\/p>\n","protected":false},"author":1,"featured_media":5010,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-53883","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/53883","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/comments?post=53883"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/53883\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/5010"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=53883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=53883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=53883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}