Seyed Amir Mousavi Lajimi

The application of a new beam-rigid body MEMS gyroscope in the frequency-modulation mode

For a new type of a MEMS gyroscope made of a cantilever beam and an end-rigid-body, the reduced-order (discretized) model is obtained by using the method of assumed modes. The discretized models static behavior is verified by comparing with the stationary partial differential governing equations. The free dynamics of the system are studied under a constant input voltage. The gyroscopic natural and pseudo-natural frequencies of the system are obtained. To operate the gyroscope in the frequency-modulation mode, the input angular rate is computed in analytical and numerical form.

Modeling and sensitivity analysis of a MEMS vibratory rotation rate sensor

A cantilever beam-rigid body microgyroscope under electrostatic force is introduced and analytically modeled. The linear dynamics of the microsystem are studied in detail and the main parameters of the sensor are investigated. The square beam carries an eccentric end rigid body affecting the dynamic and static characteristics of the sensor. A detailed sensitivity analysis is performed and the effects of the base rotation rate, the excitation frequency, and the damping ratio (quality factor) on the dynamics of the system are explored.

A Parametric Study of the Response of a Beam-Rigid-Body Microgyroscope

A parametric study of a cantilever beam-based microgyroscope is presented. The microgyroscope is comprised of a cantilever beam with a rigid-body attached to its free end. The system is electrostatically forced in one direction and sensed in an orthogonal direction. This model of a beam-rigid-body MEMS gyroscope includes the effects of mass eccentricity and width-ratio. The effects of the large end mass (rigid-body) are presented via results for its static response and its linear dynamic response as characterized by its eigenfrequencies.Copyright

Nonlinear Dynamics of a Beam-Rigid Body Microgyroscope

The nonlinear dynamics of a cantilever-beam-rigid-body MEMS gyroscope near primary resonance are studied by using a shooting method and long time integration. The microsensor includes a square beam carrying an eccentric end-rigid-body rotating about the longitudinal axis and under an electrostatic force. The mathematical model of the system is reduced by using the method of assumed modes. Using a shooting method and long time integration, the dynamic characteristics of the system are investigated and presented in terms of frequency-response plots and force-response curves. The bifurcation points are discussed and the regions of instability are characterized.Copyright