{"id":11397,"date":"2021-10-29T12:50:30","date_gmt":"2021-10-29T12:50:30","guid":{"rendered":"https:\/\/blog.infraspeak.com\/?p=11397"},"modified":"2023-02-07T17:05:55","modified_gmt":"2023-02-07T17:05:55","slug":"analise-por-ultrassons","status":"publish","type":"post","link":"https:\/\/blog.infraspeak.com\/pt-pt\/analise-por-ultrassons\/","title":{"rendered":"An\u00e1lise por Ultrassons: como \u00e9 que funciona?"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div><p><span style=\"font-weight: 400;\">A an\u00e1lise por ultrassons \u00e9 um tipo de ensaio n\u00e3o destrutivo. Estuda a propaga\u00e7\u00e3o de ondas sonoras nos materiais testados, o que possibilita a dete\u00e7\u00e3o de falhas profundas. Ao longo deste artigo vamos explorar o potencial da an\u00e1lise por ultrassons como instrumento de monitoriza\u00e7\u00e3o da condi\u00e7\u00e3o e como m\u00e9todo de <a href=\"https:\/\/blog.infraspeak.com\/pt-pt\/o-que-e-manutencao-preditiva\/\">manuten\u00e7\u00e3o preditiva<\/a>.<br \/>\n<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Como funciona a an\u00e1lise por ultrassons?<\/b><\/h2>\n<p>Existem v\u00e1rias t\u00e9cnicas de an\u00e1lise por ultrassons. No seu cerne, funcionam todas da mesma maneira: h\u00e1 um <strong>transdutor<\/strong> que se liga a um <strong>detetor de falhas ou m\u00e1quina de diagn\u00f3stico<\/strong> (que \u00e9 um recetor de impulsos e um oscilosc\u00f3pio). Normalmente, o transdutor est\u00e1 ligado ao objeto que est\u00e1 a ser inspecionado por um acoplante, como um gel, \u00f3leo ou \u00e1gua. No entanto, t\u00e9cnicas sem contacto (por exemplo, transdutores ac\u00fasticos eletromagn\u00e9ticos) n\u00e3o necessitam do acoplante.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><b>objeto \u27a1 acoplante \u27a1 transdutor \u27a1 m\u00e1quina de diagn\u00f3stico<\/b><\/p>\n<p>&nbsp;<\/p>\n<p>Os transdutores de ultrassons tamb\u00e9m n\u00e3o s\u00e3o todos iguais.<b> Existem dois m\u00e9todos de ensaio por ultrassons: reflex\u00e3o (modo pulso-eco) e atenua\u00e7\u00e3o (modo transmiss\u00e3o).<br \/>\n<\/b><\/p>\n<p>&nbsp;<\/p>\n<p>No modo pulso-eco, o transdutor tanto emite como recebe as ondas. As ondas refletidas (o eco) sinalizam imperfei\u00e7\u00f5es, que s\u00e3o exibidas na m\u00e1quina de diagn\u00f3stico como uma amplitude no eixo dos <em>yy<\/em>\u00a0para representar a intensidade. A dist\u00e2ncia ou o tempo aparecem no eixo dos <em>xx<\/em>, o que nos permite determinar a profundidade do sinal. \u00c9 muito comum na <b>an\u00e1lise por ultrassons de contacto.<\/b><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Nos testes de modo transmiss\u00e3o, um dispositivo emite ondas (o transmissor) e outro recebe a energia sonora (o recetor). Imperfei\u00e7\u00f5es e falhas diminuem a quantidade de energia que chega ao recetor (atenua\u00e7\u00e3o da energia), o que permite detetar falhas e outras condi\u00e7\u00f5es. Tipicamente, o transmissor e o recetor est\u00e3o imersos, denominando-se assim de an\u00e1lise por ultrassons imersa.<br \/>\n<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><b>An\u00e1lise por ultrassons: aplica\u00e7\u00f5es<\/b><\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"><strong>A an\u00e1lise por ultrassons pode ser feita em metais e ligas, mas tamb\u00e9m pode ser usada em bet\u00e3o, madeira e comp\u00f3sitos.<\/strong> \u00c9 frequentemente utilizada em constru\u00e7\u00f5es de a\u00e7o e alum\u00ednio, metalurgia, produ\u00e7\u00e3o e nas ind\u00fastrias aeroespacial e autom\u00f3vel.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"><strong>Dete\u00e7\u00e3o de fugas em ar comprimido, g\u00e1s inerte, sistemas de v\u00e1cuo e torneiras.<\/strong>\u00a0Sabia que <a href=\"https:\/\/www.maintworld.com\/Events\/Watch-Webinar-Recording-Energy-Conservation-Utilising-Ultrasound-to-improve-your-plants-Energy-Usage\">31% do consumo energ\u00e9tico<\/a> pode ser evitado atrav\u00e9s da repara\u00e7\u00e3o de fugas? Se tiver informa\u00e7\u00e3o suficiente, tente estimar o custo das fugas nas suas instala\u00e7\u00f5es para estimar o retorno do investimento. Al\u00e9m disso, evitar as fugas tamb\u00e9m reduz a pegada de carbono.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><b><span style=\"font-weight: 400;\"><strong>Sistemas el\u00e9tricos.<\/strong> A an\u00e1lise por ultrassons pode ser muito \u00fatil para inspe\u00e7\u00f5es el\u00e9tricas e dete\u00e7\u00e3o de arcos el\u00e9tricos, diminuindo o risco de perigos el\u00e9tricos ou inc\u00eandios el\u00e9tricos. Al\u00e9m disso, os t\u00e9cnicos podem efetuar a inspe\u00e7\u00e3o em seguran\u00e7a, sem entrar em contacto direto com componentes el\u00e9tricos.<\/span><\/b><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Equipamentos mec\u00e2nicos.<\/strong> A an\u00e1lise por ultrassons \u00e9 apropriada para inspe\u00e7\u00f5es mec\u00e2nicas, visto que pode avaliar a espessura e detetar corros\u00e3o. Tamb\u00e9m \u00e9 adequada para monitorizar o desgaste dos rolamentos e para determinar a frequ\u00eancia de lubrifica\u00e7\u00e3o dos rolamentos e a quantidade da mesma. A sublubrifica\u00e7\u00e3o faz com que o desgaste dos componentes seja mais r\u00e1pido do que o habitual, enquanto a lubrifica\u00e7\u00e3o excessiva pode causar danos a longo prazo nos motores.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><b>Vantagens da an\u00e1lise por ultrassons<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A an\u00e1lise por ultrassons tem v\u00e1rias vantagens, em compara\u00e7\u00e3o tanto com a manuten\u00e7\u00e3o preventiva &#8220;tradicional&#8221; como com outras ferramentas de manuten\u00e7\u00e3o preditiva. Aqui est\u00e3o as principais vantagens deste m\u00e9otdo::<br \/>\n<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><strong>Deteta falhas profundas que de outra forma n\u00e3o seriam detetadas;<\/strong><\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><strong>Tem alta sensibilidade e precis\u00e3o<\/strong>, pelo que consegue detetar mesmo as falhas de menor dimens\u00e3o;<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><strong>\u00c9 um teste n\u00e3o destrutivo que pode ser realizado a qualquer altura<\/strong>, e n\u00e3o afeta a m\u00e1quina nem os equipamentos pr\u00f3ximos;<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><strong>Apenas requer acesso \u00e0 superf\u00edcie<\/strong>, pelo que \u00e9 considerada uma op\u00e7\u00e3o segura para os t\u00e9cnicos (por exemplo, os t\u00e9cnicos podem avaliar o estado do equipamento el\u00e9trico sem correr riscos desnecess\u00e1rios ao aproximarem-se dele);<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><strong>Tem um grande potencial de automatiza\u00e7\u00e3o<\/strong>, o que a tornaria ainda mais acess\u00edvel e eliminaria quaisquer riscos que ainda possa ter para os t\u00e9cnicos;<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h4 style=\"padding-left: 30px;\"><b> \u2699\ufe0f Como automatizar a an\u00e1lise por ultrassons<\/b><\/h4>\n<p style=\"padding-left: 30px;\"><span style=\"font-weight: 400;\">Os sensores de an\u00e1lise por ultrassons recolhem dados para utiliza\u00e7\u00e3o imediata. Os dados s\u00e3o transferidos para uma plataforma de manuten\u00e7\u00e3o para posterior an\u00e1lise e acompanhamento do desempenho. Se a pr\u00f3pria plataforma for inteligente, notificar\u00e1 os gestores quando os valores se desviarem dos valores base e\/ou se alterarem ao longo do tempo. Estes sensores podem tamb\u00e9m ser ligados a outros dispositivos que possam fornecer informa\u00e7\u00f5es importantes, tais como term\u00f3metros, c\u00e2maras e analisadores de espectro.<br \/>\n<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\"><strong>Al\u00e9m de detetar defeitos, tamb\u00e9m oferece mais informa\u00e7\u00e3o que pode ajudar no diagn\u00f3stico<\/strong>, como tamanho, orienta\u00e7\u00e3o, forma e assim por diante.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<table>\n<tbody>\n<tr>\n<td>\n<div style=\"background-color: #eee; padding: 20px;\">\n<h3><b><br \/>\nCombine a an\u00e1lise por ultrassons com a an\u00e1lise de vibra\u00e7\u00e3o<\/b><\/h3>\n<div style=\"background-color: #eee; padding: 20px;\">Algumas pessoas argumentam que a an\u00e1lise por ultrassons e a an\u00e1lise de vibra\u00e7\u00e3o detetam as mesmas falhas. Contudo, em alguns casos, como as falhas de rolamentos, uma an\u00e1lise por ultrassons pode detetar problemas <a href=\"https:\/\/www.maintworld.com\/Asset-Management\/Ultrasound-and-Vibration-analysis-two-key-elements-of-predictive-maintenance\">ainda mais cedo do que a an\u00e1lise de vibra\u00e7\u00e3o<\/a>. \u00c9 a &#8220;primeira linha de defesa&#8221;. Tamb\u00e9m defendemos que a informa\u00e7\u00e3o que ambas as an\u00e1lises fornecem \u00e9 diferente: a an\u00e1lise por ultrassons pode detetar falhas, e a an\u00e1lise de vibra\u00e7\u00e3o pode diagnostic\u00e1-las.<b> A combina\u00e7\u00e3o de ambas \u00e9 altamente eficaz.<br \/>\n<\/b><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><b>Desvantagens da an\u00e1lise por ultrassons<\/b><\/h2>\n<p>A an\u00e1lise por ultrassons n\u00e3o tem muitas desvantagens, especialmente quando comparada com outros m\u00e9todos de manuten\u00e7\u00e3o preditiva complexos e dispendiosos. Vamos analisar mais de perto as desvantagens da an\u00e1lise por ultrassons:<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>N\u00e3o \u00e9 apropriada para pe\u00e7as com uma forma irregular ou muito finas.<\/strong>\u00a0A superf\u00edcie inspecionada deve estar limpa e livre de objetos soltos, por exemplo, tinta que possa estar a descascar, etc.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Se a an\u00e1lise por ultrassons n\u00e3o for automatizada, os t\u00e9cnicos precisam de receber forma\u00e7\u00e3o especializada.<\/strong>\u00a0Os gestores que recebem os dados precisam de ter um vasto conhecimento.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>Como a maioria das ferramentas de monitoriza\u00e7\u00e3o da condi\u00e7\u00e3o\/manuten\u00e7\u00e3o preditiva, requer um investimento inicial<\/strong>\u00a0em equipamentos e ferramentas de an\u00e1lise de dados. No entanto, h\u00e1 v\u00e1rios tipos de equipamentos dispon\u00edveis no mercado e provavelmente encontrar\u00e1 op\u00e7\u00f5es mais acess\u00edveis (em compara\u00e7\u00e3o com outras ferramentas de manuten\u00e7\u00e3o preditiva).<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li style=\"font-weight: 400;\"><strong>O equipamento precisa de cumprir as normas e ser calibrado<\/strong>\u00a0em intervalos de tempo espec\u00edficos para garantir a exatid\u00e3o das leituras.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>A utiliza\u00e7\u00e3o da an\u00e1lise por ultrassons para detetar falhas em materiais espessos foi proposta pela primeira vez na d\u00e9cada de 1930. Quase cem anos mais tarde, a an\u00e1lise por ultrassons tornou-se uma realidade e um dos mais vers\u00e1teis m\u00e9todos de manuten\u00e7\u00e3o preditiva que os gestores podem aplicar.<\/p>\n<p><a href=\"https:\/\/infraspeak.com\/pt-pt\/demo\/\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-3725\" src=\"http:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/11\/PT-Demo-Banner.png\" alt=\"\" width=\"1694\" height=\"582\" srcset=\"https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/11\/PT-Demo-Banner.png 1694w, https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/11\/PT-Demo-Banner-300x103.png 300w, https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/11\/PT-Demo-Banner-768x264.png 768w, https:\/\/blog.infraspeak.com\/wp-content\/uploads\/2019\/11\/PT-Demo-Banner-1024x352.png 1024w\" sizes=\"(max-width: 1694px) 100vw, 1694px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A an\u00e1lise por ultrassons \u00e9 um tipo de ensaio n\u00e3o destrutivo. Estuda a propaga\u00e7\u00e3o de ondas sonoras nos materiais testados, o que possibilita a dete\u00e7\u00e3o de falhas profundas. Ao longo deste artigo vamos explorar o potencial da an\u00e1lise por ultrassons como instrumento de monitoriza\u00e7\u00e3o da condi\u00e7\u00e3o e como m\u00e9todo de manuten\u00e7\u00e3o preditiva.<\/p>\n","protected":false},"author":54,"featured_media":11377,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":"","_wp_rev_ctl_limit":""},"categories":[371],"tags":[],"class_list":["post-11397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manutencao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>An\u00e1lise por Ultrassons: como \u00e9 que funciona? &#8226; Infraspeak Blog<\/title>\n<meta name=\"description\" content=\"A an\u00e1lise por ultrassons \u00e9 um m\u00e9todo de manuten\u00e7\u00e3o preditiva. 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