Vibraçoes Essay

482 words - 2 pages

Universidade Federal do Rio de Janeiro - UFRJLaboratório de Engenharia Mecânica IMódulo de VibraçõesArthur Pimentel GobbiSetembro-2014Rio de Janeiro - RJExperimento 1:A primeira parte do experimento consiste em analisar as características e o seu determinado espectro de diversas ondas, onde estas são geradas e observadas por um software, ou seja, além de fonte também funciona com um "osciloscópio". Posteriormente analisar os ruídos branco e rosa (sinais aleatórios), por fim determinar largura de pulso e faixa útil de impulsos provenientes do martelo (sinais impulsivos) com diferentes materiais nas pontas.Sinal Harmônico:HSeu espectro se apresenta apenas com a frequência natural.Sinal Quadrado e Triangular respectivamente:Os dois sinais apresentam espectros com os nós em valores impares, porém a onda triangular tem frequências com maiores amplitudes.Sinal Dente-de-serra:A direita-100% A esquerda-0%Devido ao fato de ela conter todas as harmônicas inteiras, ela é considerada uma das melhores formas de onda para a construção de outros sons.Sinal de Pulso:Ruído Branco:O ruído branco não pode ser definido como uma forma de onda, mas é o som mais complexo possível de ser obtido, porque possui todas as frequências do espectro sonoro.Ruído Rosa:O ruído rosa é um sinal com características intermediárias entre o ruído branco e o vermelho.Impulsos com o martelo:

Característica do pulso

Largura do pulso (ms)

Faixa útil (Hz)










OBS: Faixa útil é a faixa de excitação do martelo e varia com a ponta do material.Experimento 2:Sistema com um grua de liberdade (massa-mola).1ª parte valor teórico: A partir do conhecimento da massa suspensa m=1,875kg, deflexão elástica Δx=0,04m foi calculado o valor teórico rigidez elástica K, frequência natural em rd/s e em Hz.K=mg/ Δx=459,70 N/mWn=15,66 rd/s dado por : Fn=Wn/2π=2,49 Hz2ª parte valor experimental:...

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