  We are presenting the design and the preliminary numerical and experimental
analyses of two mismatched Coriolis vibratory gyroscopes incorporating
nonlinear modal interaction. A novel double-H design includes two
clamped-clamped beams and a suspended mass in the middle connected to the base
beams via four short cantilevers. Another design is a T-shaped gyro including a
primary doubly-clamped beam and a secondary sense beam. A combination of
analytical, finite element, and experimental analyses are employed to study the
characteristics of the nonlinear gyro. The drive mode matches the structure's
second mode, while the sense mode matches the fundamental mode of the
structure. Our preliminary study indicates that the bandwidth and the
sensitivity of the rotation rate sensor are improved by employing the nonlinear
modal interaction.
