A machine of mass 25 kg is placed on an elastic foundation. A sinusoidal force of magnitude 25 N is applied to the machine. A frequency sweep reveals that the maximum (peak) steady-state amplitude of 1.3 mm occurs when the period of the response reaches 0.22 s. Determine: 1- The damping ratio & 2- The equivalent stiffness of the elastic supporting foundation.

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Types of loading

In mechanical terminology, the term load indicates that external force/weight, either constant or variable, acts on a mechanical member/structure. The weight of an object of a specific material is also an external load, and the external force that works on a structure comes under the categories of loading. The external load generates its effects as stress and strain in the structure.