Analise Vibração NSK
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Excelente material para iniciantes na utilização da técnica de analise de vibração para detecção de falhas em máquinas r...
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ANÁLISE DE VIBRAÇÕES
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CONCEITOS DE MANUTENÇÃO TIPOS DE MANUTENÇÕES Manutenção Corretiva - É o serviço de manutenção manutenção realizado após a falha, falha, como o próprio nome sugere é o trabalho de corrigir. Equivale a uma atitude de defesa enquanto se espera uma próxima falha acidental. É chamada “manutenção catastrófica” ou “manutenção tipo bombeiro”. Ou seja, é norteada pela idéia: “nada se faz enquanto não houver fumaça (defeito ou falha)”. Este ainda é o método tradicional de se fazer manutenção e sempre gera altos custos de material, mão de obra e tempo elevado de equipamento parado, devido a dificuldade de se planejar as intervenções. Manutenção Preventiva – Define-se como sendo um conjunto de procedimentos que visam manter a máquina em funcionamento, funcionamento, executando rotinas que previnam paradas imprevistas. É o método onde as intervenções têm previsão, preparação, programação e controle. Ou seja, as intervenções são planejadas.
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CONCEITOS DE MANUTENÇÃO Manutenção Preditiva – É um aperfeiçoamento da manutenção preventiva, baseado no real conhecimento das condições da máquina, equipamento ou componente. A manutenção manutenção preditiva nasceu de uma constatação: muitos componentes ainda em bom estado são trocados nas intervenções de preventiva.Devido a isso, buscou-se modos de rever o momento da falha para intervir pouco antes da ocorrência. Seu objetivo é prevenir falhas nos equipamentos ou sistemas através de acompanhamento acompanhamento de parâmetros diversos , permitindo a operação continua do equipamento pelo maior tempo possível. Ou seja a manutenção preditiva privilegia a disponibilidade à medida que não promove a intervenção nos equipamentos ou sistemas, pois as medições e verificações são efetuadas com o equipamento produzindo. produzindo. Manutenção Pró-ativa - Tem como objetivo fazer com que as instalações e/ou equipamentos atinjam, com “start-up vertical”, o desempenho das funções requeridas nos processos, promovendo as condições necessárias para que esse desempenho padrão seja mantido ao longo do seu ciclo de vida. Início das ações ainda na fase de projeto.
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MANUTENÇÃO PREDITIVA TÉCNICAS UTILIZADAS E BASE TECNOLÓGICA
Análise Termográfica Definição – Definição – A termografia é a técnica preditiva que permite o acompanhamento acompanhamento de temperaturas e a formação de imagens térmicas, conhecidas por termogramas. Tipo de Análise – Análise – Termogramas. Instrumentos Utilizados – Utilizados – Termovisores compostos por câmera e unidade de vídeo.
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MANUTENÇÃO PREDITIVA TÉCNICAS UTILIZADAS E BASE TECNOLÓGICA
Análise de Óleo Definição – As análises de óleo tradicionais tradicionais implicam na na retirada de amostras, a intervalos intervalos regulares, de modo que o acompanhamento das características do lubrificante possa ser feito ao longo do tempo. Tipo de Análises – Análise espectrográfica, espectrográfica, ferrografia, ferrografia, viscosidade e cromatografia. cromatografia. Instrumentos Utilizados – Espectrógrafo, Espectrômetro Espectrômetro de absorção, Cromatógrafo Cromatógrafo Gasoso, Gasoso, Ferrógrafo e Viscosímetro.
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MANUTENÇÃO PREDITIVA TÉCNICAS UTILIZADAS E BASE TECNOLÓGICA Análise Acústica Definição – É a técnica utilizada para detectar ruídos ruídos de alta freqüência freqüência produzidos por por vazamentos, particularmente particularmente de ar comprimidos gases e vapor. O sensor é um microfone apropriado e o ruído é convertido para uma freqüência audível ou mostrado em um indicador. indicador. Tipo de Análise – Análise de Freqüência Freqüência Ultra-sônica. Ultra-sônica. Instrumentos Utilizados – Detector Ultra-sônico e fone fone de ouvido. ouvido. Inspeção Estacionária Definição – É utilizada para para detectar defeitos defeitos como: trincas, desgastes desgastes internos ou externos, externos, porosidades, defeitos em soldas ou dupla dupla laminação laminação em estruturas mecânicas de máquinas máquinas ou componentes estacionários.
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MANUTENÇÃO PREDITIVA TÉCNICAS UTILIZADAS E BASE TECNOLÓGICA
Análise de Vibração Definição – Através da monitoração dos parâmetros de vibração, tais como, aceleração, velocidade e deslocamento, deslocamento, é possível detectar prematuramente os defeitos e assim manter a saúde dinâmica dos equipamentos, equipamentos, de modo a inibir a evolução de “não conformidades”.
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CONHECIMENTO DE MÁQUINAS Como veremos, a análise de vibração proporcionará uma valiosa ajuda na identificação de causas. Quanto mais você conhece sobre o defeito, maior a confiança com a qual você pode diagnosticar.
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A VIBRAÇÃO Através da monitoração dos parâmetros de vibração, tais como, aceleração, velocidade e
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A VIBRAÇÃO Um corpo está vibrando, quando descreve um movimento de oscilação em torno de uma posição de referência e seus parâmetros de projetos são alterados. Mancal Exemp emplo: lo: Osci Oscila laçã ção o de um eixo ao redor de
Eixo
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A VIBRAÇÃO Poré Porém, m, o que que se enco ncontram tram nos nos equ equipa ipament mentos os ind industri striaais, is, são são vári várioos comp compon oneente ntes vib vibran rando em freqüências diferentes, ao mesmo tempo, de modo que estas vibrações se somam e se subtraem formando um espectro em função do tempo, no qual não se distingue a quantidade de comp compon onen ente tess exis existe tent ntes es,, tamp tampou ouco co as freq freqüê üênc ncia iass em que que ocor ocorre rem. m.
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PROBLEMAS CAUSADORES DE VIBRAÇÃO Turbilhonamento do Filme de Óleo É um problema de projeto e bastante incomum de ser encontrado como fonte de problema. Espera-se o aparecimento desta vibração tão logo o equipamento entre em funcionamento. funcionamento. Importante analisar com boa definição para diferenciar diferenciar entre 0.48 x RPM e 0.50 x RPM.
1X RPM
0.48x RPM
0.5x RPM
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PROBLEMAS CAUSADORES DE VIBRAÇÃO Engrenamento Defeituoso Sintomas e Problemas É sabido que vibrações no engrenamento proporcionam vibrações na freqüência calculada por número de dentes vezes a rotação do eixo e harmônicos.
Fe = Z x rpm Para saber-se qual eixo contém a engrenagem defeito (pinhão ou engrenagem), observa-se a presença de bandas laterais em torno desta freqüência de engrenamento, conforme figura abaixo.
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PROBLEMAS CAUSADORES DE VIBRAÇÃO Falhas em Motores Elétricos de Indução É necessário, primeiramente, conhecermos algumas freqüências fundamentais inerentes a este tipo de equipamento, são elas: Rotação nominal nominal do motor (Nm): Rotação que normalmente aparece como dado de placa, 1185 Rpm por exemplo. Rotação síncrona do campo (Ns): É utilizada para o cálculo da freqüência de escorregamento, é a rotação do campo magnético girante pelas bobinas do estator. = . . 60 . número de pólos Rotação real do motor motor no instant instantee da coleta (Nr): Deve ser confirmada a rotação exata do motor, via análise de vibração (Velocidade Rms até
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PROBLEMAS CAUSADORES DE VIBRAÇÃO Defeitos em Rolamentos Os rolamentos são elementos de máquinas bastante estudados em termos de vibração e a razão disto é que raramente se encontra uma máquina onde não os utilizem. Os defeitos de rolamento podem gerar quatro freqüências fundamentais características: uma devido a defeito na pista externa, outra na interna, outra nos separadores ou gaiolas e por fim outra devido a defeito nos elementos rolantes (esferas ou roletes).
Para o cálculo das freqüências fundamentais de rolamentos usa-se a geometria do rolamento (que é o que os softwares fazem automaticamente): Pd = diâmetro nominal; Bd = diâmetro do elemento; n = número de elementos girantes; Ø = ângulo de contato.
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PROBLEMAS CAUSADORES DE VIBRAÇÃO Vibração Aero-hidrodinâmica
O fluxo do fluído que passa pelas pás dos rotores tanto de bombas quanto de turbinas, provocam uma freqüência bem característica, que é equivalente ao número de pás multiplicado pela freqüência de rotação do mesmo e, em alguns casos, seus harmônicos também aparecem. O plano dominante quando se trata de bombas é o radial, r adial, na direção da tubulação de descarga. RMB - BOMBA BB-04 -E4H MANCAL
18
c e S / 14 m m m e 12 e d a d 10 i c o l e
Route Spectrum 14-APR-99 15:52
6x
OVRALL= 14.54 14.54 V-DG RMS= 14.3 14.39 9 CARGA= 100.0 100.0 RPM= 1750. RPS = 29.16 29. 16
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CONCEITO MULTIPARÂMETRO Trabalha para bloquear a falha no nascimento do defeito.
Trabalha para predizer quando a falha ocorrerá.
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CONCEITO MULTIPARÂMETRO Pizza rica de técnicas
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