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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 t . Considering that all damping is structural, with structural damping factor = 0 . 45, and k eff = 1800 [N/m]: (b) Find equation of motion. (c) What is the magnitude of the oscillation for = 18 . 84 [rad/s]? l 2 l 2 ME163 Mechanical Vibrations 2 HW4 3. Figure 2 presents data from a forced vibration experiment. The y-axis includes both the spring force and viscous force v/s displacement. Determine the eective damping and eective stiness for the system. In the experiment, the system was excited at a frequency = 8[ rad s ]. The gure 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).-0.04-0.03-0.02-0.01 0.01 0.02 0.03 0.04-1.5-1-0.5 0.5 1 1.5 x(t) Total Force (damper and spring) ME163 Mechanical Vibrations 3 HW4...
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- Winter '08