  Elastic periodic lattices act as mechanical filters of incident vibrations.
By and large, they forbid wave propagation within bandgaps and resonate outside
them. However, they often encounter "truncation resonances" (TRs) inside
bandgaps when certain conditions are met. In this study, we show that the
extent of unit cell asymmetry, its mass and stiffness contrasts, and the
boundary conditions all play a role in the TR location and wave profile. The
work is experimentally supported via two examples that validate the
methodology, and a set of design charts is provided as a blueprint for
selective TR placement in diatomic lattices.
