We consider the problem of attitude stabilization for a low Earth orbit satellite having only electromagnetic actuation. Such is not fully actuated, as control torque cross-product magnetic moment due to magnetorquers and geomagnetic field. The aim this work study whether oscillating controls can be designed such that actuated via alone achieve full three-axis irrespective position satellite. T...

Abstract The poppet valve is by far the most widely used in cylinder head design of internal combustion (IC) engines; however, valves themselves create significant flow restrictions during both intake and exhaust strokes, thus causing a reduction volumetric efficiency that affects overall engine performance. By removing restrictive from path air into out allowing to unobstructed, any given IC c...

In this paper, a novel electromagnetic micropositioner is designed from an orthogonal 3-P(4S) parallel mechanism through the substitution method and modular design techniques. Preliminary prototype experiments show that possesses excellent decoupling performance. Thus independent control strategy carried out for motion of micropositioner. An RBF neural networks based adaptive backstepping termi...

We have demonstrated a three-dimensional movable metamaterial (MM) with reconfigurable electric split-ring resonators (eSRR) at terahertz frequencies. This is accomplished by making planar arrays of eSRR with movable stress curved beams (eSRR-MSCBs) which are actuated out-of-plane by electrostatic force. Our results have demonstrated that the eSRR-MSCBs possess blueshifting capabilities and pol...

Valvetrain flexibility enables the optimization of the engine’s ability to breathe across the operating range, resulting in more efficient operation. The authors have shown the merit of improving volumetric efficiency via valvetrain flexibility to improve fuel efficiency at elevated engine speeds in the previous work. This study focuses on production viable solutions targeting similar volumetri...

Electromagnetic micro-transducers have been utilized in a number of distinct applications in recent years due, in large part, to their scalability, low power consumption, self-sensing capabilities and ease of integration with external hardware. In the present work, the highly non-linear dynamic behavior of a new class of parametrically excited, electromagnetically actuated microcantilevers is e...

This paper investigates Ultra Wide Band (UWB) response of a self-actuated electromagnetic wave shield based on a diode grid both in frequency and time domain. The investigation is first carried out on a shield valid for an incident wave polarized at a specific direction only, then extended to a shield effective for an incident wave polarized at an arbitrary direction. In the frequency domain, t...