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Unformatted text preview: T and m eff . Now suppose the man begins to oscillate shake his legs imposing a force f ( t ) = 230cos ωt . Considering that all damping is structural, with structural damping factor γ = 0 . 45, and k eff = 1800 [N/m]: (b) Find equation of motion. (c) What is the magnitude of the oscillation for ω = 18 . 84 [rad/s]? l 2 l 2 ME163 Mechanical Vibrations 2 HW4 3. Figure 2 presents data from a forced vibration experiment. The yaxis includes both the spring force and viscous force v/s displacement. Determine the e±ective damping and e±ective sti±ness for the system. In the experiment, the system was excited at a frequency ω = 8[ rad s ]. The ²gure will be online and you may open it in Matlab and use the cursor to get necessary information (or just by inspecting the plot below).0.040.030.020.01 0.01 0.02 0.03 0.041.510.5 0.5 1 1.5 x(t) Total Force (damper and spring) ME163 Mechanical Vibrations 3 HW4...
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 Winter '08
 Mezic,I
 Mass

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