Remaining Time: 1 hour, 54 minutes, 13 seconds Question Completion Status: 28 2

Question

Remaining Time: 1 hour, 54 minutes, 13 seconds Question Completion Status: 28 2 1 32 33 34 An electric overhead travelling crane, consisting of a girder, trolley, and wire rope, can be modelled as a 2-DOF system shown in the Figure 1. The girder has the equivalent stlfhess of ki . The wire rope is made of steel and has the equivalent stiffness of k2 Another piece of wire rope is used to hold the load in place, and has the equivalent stiffness of k3. The mass of trolley is mi and that of the load to be lifted is ma Girder Trolley ng Wire rope Load mlifted Wire rope Fixed Support Figure 1 MacBook Air

Explanation / Answer

Let x2 > x1. Then the sprint k2 is stretched and the spring k3 is compressed for downward motion of both the masses. Hence the FBD shown in the second page is the correct one.

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