Publications

This thesis addresses the optimal kinematic synthesis of planar, full cycle, constant velocity, straight-line mechanisms. Exact and approximate straight line generating mechansisms in the literature were analyzed for their constatnt-velocity characteristcs. Some exact straight-line mechanisms depending on special link length ratios or on the principle of inversion, are shown to not have constant-velocity charactertists, wtih uniform input velocity. Mechanisms that were found to have constant-velocity characteristics include: the Chebychev cognate four bar (Spragg and Tesar, 1972...

The damping in micromechanical single ended tuning fork resonators are investigated. Analytical models are built to simulate the effects of end damping, as in the case of an anchor, and material damping on the...

The generation of a precise and stable reference frequency with low drift and phase noise is a need for electronic products as navigation systems, wireless communication devices or multimedia applications. Recent researches proved that Lamb wave resonators (LWR) made of aluminium nitride (AlN) piezoelectric material is the best technology in term of high resonance frequencies multiplex (from 100MHz to 1GHz), high quality factor (up to 2000)...

The complete design cycle for micromachined angular rate sensors is presented. Original analysis is combined with previously published results culled from a diverse spectrum of sources, and form a complete treament of the pertinent design issues. Main functional components (actuator, oscillating mass, transducer and interface circuit) are introduced with desgin analysis and methodologies, and the dependence of component and sensor performance on operating frequency is discussed in detail. System-level issues such as electrical noise, mechanical and thermal error sources, and the use of...