Determining Loss Factors Using the Power Input Method with Shaker Excitation

This work describes the third phase in the authors' development of an experimental procedure for determining the loss factor by the power input method (PIM). Unlike in the second phase in which the excitation was provided by an impact hammer, the excitation in the third phase was provided by a shaker. Experimental testing performed on a special-design setup validated the effects of parameters such as shaker mass, excitation point position, nonperpendicular force input, and specimen size and shape, as well as repeatability. In the fourth phase, the number and shape of the structure portions to be used in the measuring procedure will be determined.