Structural Design
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Title: Structural Design

Essay Details:

Subject: Science
Author: John B
Date: December 2, 2012
Level: University
Grade: A
Length: 2 / 465

Essay text:

Careful consideration was made while measuring the amplitude. Finding ?_d, the damped natural frequency Shook 130 times in 50 seconds; f_d=130/50=2.6Hz ?_d=2?f_d=16.328 rad/s Finding ?, the damping ratio Based on the analyses of the Fig.3 x_1=25,? x?_130=3.36 ?= 1/(2?*130) ln?(x_1/x_130 )=1/(2?*130) ln?(25/3.36)=0.0025 Finding ?_n, the natural frequency ?_n=?_d (v(1-?^2 ))^(-1)=16.328(v(1-?0.0025?^2 ))^(-1)=16.328 rad/s f_n=?_n/2?=2.60 Since ? is so small, ?_n=?_d Second Experiment: base excitation to SDOF System ([Units] x-axis; sec/ y-axis; cm)> The amplitude of the movement of the steel base was constant in all frequency tried, as 2...

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