{"id":60846,"date":"2023-04-21T15:12:03","date_gmt":"2023-04-21T20:12:03","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-block-ultrasonic-sound\/"},"modified":"2025-01-27T06:06:56","modified_gmt":"2025-01-27T11:06:56","slug":"how-to-block-ultrasonic-sound","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-to-block-ultrasonic-sound\/","title":{"rendered":"Ultrazvukov\u00e1 ochrana: Jak zablokovat ultrazvuk?"},"content":{"rendered":"<p>Ultrazvuk je zvuk s frekvenc\u00ed vy\u0161\u0161\u00ed ne\u017e 20 kHz, tedy nad hranic\u00ed sly\u0161itelnosti lidsk\u00e9ho ucha.  Jeho blokov\u00e1n\u00ed p\u0159edstavuje specifick\u00fd probl\u00e9m, jeliko\u017e tradi\u010dn\u00ed metody zvukov\u00e9 izolace, efektivn\u00ed pro ni\u017e\u0161\u00ed frekvence, zde selh\u00e1vaj\u00ed.  Existuje v\u0161ak n\u011bkolik p\u0159\u00edstup\u016f, kter\u00e9 lze s r\u016fznou m\u00edrou \u00fasp\u011bchu pou\u017e\u00edt.<\/p>\n<p>Materi\u00e1ly absorbuj\u00edc\u00ed ultrazvuk<\/p>\n<p>\u00da\u010dinnost blokov\u00e1n\u00ed ultrazvuku z\u00e1vis\u00ed zna\u010dn\u011b na materi\u00e1lu a jeho tlou\u0161\u0165ce.  M\u011bkk\u00e9, p\u00f3rovit\u00e9 materi\u00e1ly, jako je p\u011bna, vlna nebo speci\u00e1ln\u00ed akustick\u00e9 panely, absorbuj\u00ed ultrazvukov\u00e9 vlny efektivn\u011bji ne\u017e tvrd\u00e9 materi\u00e1ly.  \u00da\u010dinnost absorpce se m\u011bn\u00ed s frekvenc\u00ed ultrazvuku.  N\u00e1sleduj\u00edc\u00ed tabulka ukazuje orienta\u010dn\u00ed hodnoty pro absorpci r\u016fzn\u00fdch materi\u00e1l\u016f:<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Materi\u00e1l<\/th>\n<th>Absorpce p\u0159i 25 kHz (%)<\/th>\n<th>Absorpce p\u0159i 40 kHz (%)<\/th>\n<th>Pozn\u00e1mka<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Polyuretanov\u00e1 p\u011bna<\/td>\n<td>80-90<\/td>\n<td>70-80<\/td>\n<td>Hustota a struktura p\u011bny ovliv\u0148uje absorpci<\/td>\n<\/tr>\n<tr>\n<td>Akustick\u00e9 panely<\/td>\n<td>60-75<\/td>\n<td>50-65<\/td>\n<td>Z\u00e1vis\u00ed na slo\u017een\u00ed a tlou\u0161\u0165ce panelu<\/td>\n<\/tr>\n<tr>\n<td>Vlna (ov\u010d\u00ed, sklen\u011bn\u00e1)<\/td>\n<td>40-60<\/td>\n<td>30-50<\/td>\n<td>Ni\u017e\u0161\u00ed absorpce ne\u017e p\u011bna<\/td>\n<\/tr>\n<tr>\n<td>Beton<\/td>\n<td>5-15<\/td>\n<td>2-10<\/td>\n<td>Velmi n\u00edzk\u00e1 absorpce<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Odru\u0161ov\u00e1n\u00ed ultrazvuku pomoc\u00ed bari\u00e9r<\/p>\n<p>Tvrd\u00e9 a hust\u00e9 materi\u00e1ly, jako je ocel, olovo nebo beton,  neabsorbuj\u00ed ultrazvuk, ale mohou jej odr\u00e1\u017eet.  Vytvo\u0159en\u00ed bari\u00e9ry z t\u011bchto materi\u00e1l\u016f m\u016f\u017ee sn\u00ed\u017eit intenzitu ultrazvuku v chr\u00e1n\u011bn\u00e9 oblasti.  \u00da\u010dinnost bari\u00e9ry z\u00e1vis\u00ed na jej\u00ed tlou\u0161\u0165ce a frekvenci ultrazvuku.  Tlou\u0161\u0165ka bari\u00e9ry by m\u011bla b\u00fdt alespo\u0148 n\u011bkolik centimetr\u016f pro dosa\u017een\u00ed v\u00fdznamn\u00e9ho efektu.  Je d\u016fle\u017eit\u00e9 si uv\u011bdomit, \u017ee odraz ultrazvuku m\u016f\u017ee v\u00e9st k jeho koncentraci v jin\u00fdch oblastech.<\/p>\n<p>Absorp\u010dn\u00ed komory a tlumi\u010de<\/p>\n<p>Pro efektivn\u00ed blokov\u00e1n\u00ed ultrazvuku v uzav\u0159en\u00fdch prostor\u00e1ch se pou\u017e\u00edvaj\u00ed speci\u00e1ln\u011b navr\u017een\u00e9 absorp\u010dn\u00ed komory.  Tyto komory jsou vystl\u00e1ny materi\u00e1ly s vysokou absorpc\u00ed ultrazvuku, jako jsou akustick\u00e9 p\u011bny s vysokou hustotou a speci\u00e1ln\u00ed akustick\u00e9 panely.  Konstrukce komory je optimalizov\u00e1na pro minimalizaci odraz\u016f a maximalizaci absorpce ultrazvuku.  V praxi se \u010dasto kombinuj\u00ed materi\u00e1ly s r\u016fznou absorpc\u00ed pro optim\u00e1ln\u00ed v\u00fdsledek.<\/p>\n<p>Ztlumen\u00ed ultrazvuku v aplikac\u00edch<\/p>\n<p>P\u0159i pr\u00e1ci s ultrazvukov\u00fdmi za\u0159\u00edzen\u00edmi, jako jsou \u010disti\u010dky nebo senzory, je d\u016fle\u017eit\u00e9 db\u00e1t na ochranu p\u0159ed nadm\u011brnou expozic\u00ed.  Pou\u017e\u00edv\u00e1n\u00ed ochrann\u00fdch pom\u016fcek, jako jsou chr\u00e1ni\u010de sluchu (i kdy\u017e nesni\u017euj\u00ed intenzitu ultrazvuku p\u0159\u00edmo, chr\u00e1n\u00ed p\u0159ed potenci\u00e1ln\u00edm po\u0161kozen\u00edm sly\u0161en\u00ed zp\u016fsoben\u00fdm soub\u011b\u017en\u00fdm hlukem), a dodr\u017eov\u00e1n\u00ed bezpe\u010dnostn\u00edch p\u0159edpis\u016f v\u00fdrobce je kl\u00ed\u010dov\u00e9. V n\u011bkter\u00fdch p\u0159\u00edpadech m\u016f\u017ee b\u00fdt nutn\u00e9 pou\u017e\u00edt speci\u00e1ln\u00ed tlumi\u010de ultrazvuku, kter\u00e9 jsou navr\u017eeny pro konkr\u00e9tn\u00ed aplikaci a frekvenci.<\/p>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee blokov\u00e1n\u00ed ultrazvuku vy\u017eaduje specifick\u00fd p\u0159\u00edstup, kter\u00fd z\u00e1vis\u00ed na frekvenci ultrazvuku, jeho intenzit\u011b a po\u017eadovan\u00e9 \u00farovni ochrany.  Kombinac\u00ed absorp\u010dn\u00edch a odraziv\u00fdch materi\u00e1l\u016f a vhodn\u00e9ho designu lze dos\u00e1hnout v\u00fdznamn\u00e9ho sn\u00ed\u017een\u00ed intenzity ultrazvuku v dan\u00e9 oblasti.  Je d\u016fle\u017eit\u00e9 zv\u00e1\u017eit v\u0161echny faktory a zvolit optim\u00e1ln\u00ed \u0159e\u0161en\u00ed pro konkr\u00e9tn\u00ed situaci.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ultrazvuk je zvuk s frekvenc\u00ed vy\u0161\u0161\u00ed ne\u017e 20 kHz, tedy nad hranic\u00ed sly\u0161itelnosti lidsk\u00e9ho ucha. Jeho blokov\u00e1n\u00ed p\u0159edstavuje specifick\u00fd probl\u00e9m, jeliko\u017e tradi\u010dn\u00ed metody zvukov\u00e9 izolace, efektivn\u00ed pro ni\u017e\u0161\u00ed frekvence, zde selh\u00e1vaj\u00ed. Existuje v\u0161ak n\u011bkolik p\u0159\u00edstup\u016f, kter\u00e9 lze s r\u016fznou m\u00edrou \u00fasp\u011bchu pou\u017e\u00edt. Materi\u00e1ly absorbuj\u00edc\u00ed ultrazvuk \u00da\u010dinnost blokov\u00e1n\u00ed ultrazvuku z\u00e1vis\u00ed zna\u010dn\u011b na materi\u00e1lu a jeho tlou\u0161\u0165ce.<\/p>\n","protected":false},"author":1,"featured_media":26475,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-60846","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\/60846","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=60846"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60846\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/26475"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=60846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=60846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=60846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}