Lightweight structural design, is often accompanied with a reduction in structural stiffness. This can result in an increase of structural vibrations. Viscoelastic damping layers may be efficiently applied to reduce unwanted vibrations. However, such a measure adds significant mass per area to a structure. Alternatively, a semipassive concept, realized by piezoceramics, can be employed. A semi-passive concept has been successfully applied to a car structure to reduce structural vibrations. Compared to classical concepts based on viscoelastic material, the increase in mass is insignificant. The applied concept results in a local increase in damping. However, to increase damping of the entire hood a finite element model of the investigated structure is essential to optimize the layout of the piezoelectric zirconate titanate (PZT-) elements. This will also incorporate any stiffening effects due to the applied PZTs. Furthermore, the concept can be more efficient by using PZT-elements to a greater extend. For broadband reduction, this method can be extended by an adaptive passive electrical network (PEN) or, alternatively, by a combination of PZT-elements and viscoelastic layers applied to the structure.


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