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Isolator Calculation

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Ketan Mehta
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221 views2 pages

Isolator Calculation

Uploaded by

Ketan Mehta
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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Given Data Derived Data

Rpm of rotating equipment i.e. fan 1800 (fd) Frequency of rotating equipment in Hz.
Hz 50 (T) Transmissibility %
(I) Isolation Efficiency Required % 80 (fn) Natural frequency of isolator in Hz
Total Load lbs 140 Load / Isolator lbs/isolator
No. of Isolators 4 (ds) Static deflection inches
(k) spring rate in lbs/inch

Given Data Derived Data


Rpm of rotating equipment i.e. fan 1800 (fd) Frequency of rotating equipment in Hz.
Hz 50 Load / Isolator lbs/isolator
(g) Gravity of acceleration in/ sec2 386.2 (fn) Natural frequency of isolator in Hz
Total Load lbs 140 (T) Transmissibility %
No. of Isolators 4 (I) Isolation Efficiency %
(k) spring rate in lbs/inch 771

Force Equations:
Vibration Isolators Undamped Vibration Isolators with Damping
M A + Kz = F(t) MA +CV+ Kz = F(t)
M = Mass Kg A = acceleration m/s2
A = Acceleration m/s2 V = velocity m/s
K = Spring Constant N/m D = displacement m
F = Applied force N C = damping coefficient Ns/m
z = Deflection m K = spring constant N/m
ω = 2π ƒ P = Peak vibration force N
f = frequency Hz
36
20
14.70
35.00
0.045
771.43

36
35.00
14.69
20.0
80.0

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