vibracoes-mecanicas-resolucao-de-exercicio-vibracao-com-amortecimento

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Vibrações mecânicas -
Resolução de exercício
vibração com amortecimento
Engenharia Mecânica
Centro Hermes
5 pag.
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Determinar a constante de amortecimento c para que, uma vez deslocada 
da posição de equilíbrio, o corpo composto (barra uhd, esfera) tenha um 
decaimento de 60% em 4 ciclos. 
 
I – Pela equação diferencial; 
II – Por massa e rigidez efetivas. 
 
 
g L/2
L/2
kA 
Me 
Mb 
A 
R
kB 
B 
0
c 
x(t
60
x(t+4P
)
kA = kB = k = 2000N/m 
Esfera: massa Me = 1 kg; raio R = 5 cm; 
JCM = 2/5.massa.Raio² 
g = 9,80 m/s2 
Barra: uniforme, homogênea e delgada 
massa Mb = 9 kg ; comprimento = L =1 m; 
JCM = 1/12.massa.compr² 
 
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