This paper presents a small wide-band loudspeaker. Particular efforts have been made to reduce the nonlinearities of the loudspeaker as much as possible. The motor structure is completely ironless, the elastomer suspensions are replaced by ferrofluid seals and a monobloc carbon foam piston substitutes the traditional conic membrane. The circular radiating surface, which is flat, has a diameter ...

To numerically solve squeezed gas-lm forces in a narrow air-gap between moving surfaces, an electrical-equivalent circuit mesh is formed that realizes the nonlinear, modiied Reynolds equation at discrete surface positions. The model is usable when investigating gas-lm forces for large gap displacements and pressure variations. It is also usable as a reference when simple, compact models for squ...

This paper presents a micro XY stage that employs electrostatic comb-drive actuators and achieves a bi-directional displacement range greater than 225 μm per motion axis. The proposed XY stage design comprises four rigid stages (ground, motion stage, and two intermediate stages) interconnected via flexure modules. The motion stage, which has two translational degrees of freedom, is connected to...

The paper presents a finite element formulation for analysis of 3D framed structures with thin-walled laminated composite cross-sections, using co-rotational approach. considers the effects large displacements on response space frames subjected to conservative and static external loads. Classical lamination theory thin fiber-reinforced laminates has been employed. Stability is performed in load...