نتایج جستجو برای: micromechanical device
تعداد نتایج: 681370 فیلتر نتایج به سال:
MOEMS technology combining MEMS and micro-optics is well suited for manipulating light. A number of different ways can be envisioned to scan, steer, or modulate light beams using tiny electromechanical structures. MEMS mirrors or microlens arrays can be used to change the light beam propagation direction for scanning or modulating the beam, and diffraction gratings, optical choppers, or microin...
This paper presents an analysis of the major mechanical component (the thorax) of the micromechanical flying insect (MFI), a centimeter sized aerial vehicle currently in development at UC Berkeley. We present a description of the kinematics of the mechanism which converts piezoelectric actuation into complex 3D wing motion. A complete non-linear modeling of the system based on the Lagrangian en...
This paper describes recent developments on the model identification and attitude control system for a Micmmechanical Flying lnsect (MFI). We include recently developed dynamical models for the thorax actuatom and various sensor models. Wing kinematic parameterization scheme was designed to generate feasible wing motions to decouple the body torques under the constraints of the thorax model. A ...
Methods for tuning extracellular matrix (ECM) mechanics in 3D cell culture that rely on increasing the concentration of either protein or cross-linking molecules fail to control important parameters such as pore size, ligand density, and molecular diffusivity. Alternatively, ECM stiffness can be modulated independently from protein concentration by mechanically loading the ECM. We have develope...
Integrated microfluidics is a sophisticated three-dimensional (multi layer) solution for high complexity serial or parallel processes. Fabrication of integrated microfluidic devices requires soft lithography and the stacking of thin-patterned PDMS layers. Precise layer alignment and bonding is crucial. There are no previously reported standards for alignment of the layers, which is mostly perfo...
The ability to control nonlinear interactions of suspended mechanical structures offers a unique opportunity to engineer rich dynamical behavior that extends the dynamic range and ultimate device sensitivity. We demonstrate a displacement sensing technique based on resonant frequency monitoring of curved, doubly clamped, bistable micromechanical beams interacting with a movable electrode. In th...
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