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Also, this is very relevant. I am in 11 th grade and have not yet learnt those stuff I can understand none of the equation for in the link provided by u Add a comment. Active Oldest Votes. And that's why damping increases the period of the oscillation. Improve this answer. John Rennie John Rennie k gold badges silver badges bronze badges. Featured on Meta.
Select the top four layers and assign them a " slow " wave speed. This material will be referred to as Material 2. Select a bilinear material model with low yield stress using the " Material Models For this particular problem we suggest to use two plot boxes located close to the material interface, Figure 2.
Figure 2 - Material damping in a two layer soil profile Starting with the set up described above, press the time increment buttom to set up the wave motion. Note that the wave travels along material 1 without noticeable changes. At the interface, part of the energy carried by the wave is transferred to material 2 and part of it is reflected. Note that, as result of the interaction at the interface, permanent deformations are concentrated close to the interface. Consequently, the stress-strain curves at these points do not follow a straight line.
At the top and bottom of the layer a similar behavior is also observed. As time goes on the wave will be transmitted and reflected multiple times at the interface. During each interaction additional plastic deformations may occur. Answer the following questions: a Is the initial wave energy affected during the motion?? Give a couple of examples. Friction readily comes to mind and helps as an analogy for thinking about damping. Due to friction part of the energy is transformed to heat or is dissipated in the form or irrecoverable or plastic deformations.
Use different damping values and repeat the analysis. Hysteretic Damping Repeat the process with elastic materials. Do you observe the attenuation of waves?? Use different material stiffness and different impedance ratios. Use different yield stresses and investigate the effect of hardening in the attenuation of waves.
If there is very large damping, the system does not even oscillate—it slowly moves toward equilibrium. This results in an objects resonant frequency getting progressively lower as damping increases. Most of the construction materials such as concrete, brick or plaster possess interconnected void within them. When these materials come in contact with water, water finds a path to penetrate into these voids.
Again this water when aided by capillary action; moves in different direction causing dampness. It just decreases the amplitude of the wave. Damping, in physics, restraining of vibratory motion, such as mechanical oscillations, noise, and alternating electric currents, by dissipation of energy. Unless a child keeps pumping a swing, its motion dies down because of damping. A system may be so damped that it cannot vibrate.
Increasing the damping will reduce the size amplitude of the oscillations at resonance, but the amount of damping has next to no effect at all on the frequency of resonance.
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