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Nonlinear dynamics can be a means to improve the properties of energy harvesting devices. Mathematical analysis of these systems as a tool for design or interpretation of experiments requires the solution of nonlinear differential equations. Most works use the third-order polynomial force (Duffing model) in order to qualitatively model mechanically nonlinear features. However, under large vibrations,...
In this paper, we present the design, fabrication and testing of a micro electret power generator harvesting low frequency and low amplitude vibration sources by the aid of its high quality factor of the device. Conventional polymer, LDPE, is used as electret material in the power generator. Silicon inward S-springs with high spring constant ratios are proposed and incorporated into the device design...
Vibration isolation systems with nonlinear stiffness under sinusoidal excitation exhibit unwanted jump phenomena and superharmonics when they are lightly damped. These characteristics can be suppressed by linear viscous damping but the force transmissibility over the high frequency range increases as a result. In this study, nonlinear viscous damping will be chosen to solve this problem with the aid...
In this paper, we describe the design and development of the newly developed 3-DOF inchworm mechanism with 6 contact points on a surface to improve a positioning repeatability. The mechanism consists of a pair of Y-shaped electromagnets and six piezoelectric actuators and moves like an inchworm. We calculate a 3-DOF simple harmonic vibration model to get input signals in any 3-DOF motions. In several...
Nonlinear phenomena are observed in coupled RLC (Resistance-Inductance-Capacitance) circuit and spring system; a new mathematical model is presented to adapt advanced research. Its dynamic equation considering inductance nonlinearity and harmonic excitation is established by Lagrange-Maxwell equation. Based on multiple scales method for nonlinear vibration analysis, the first approximation solutions...
A simulation of a new vibration isolation system using negative stiffness is proposed in this paper. The vibration isolation can be improved by incorporating a negative stiffness such that the dynamic stiffness is much less than the static stiffness. This paper is concerned with the nonlinear analysis using Harmonic Balance (HB) method of a High-Static-Low-Dynamic-Stiffness (HSLDS) system. The system...
Here, we propose a practical single pole double throw (SPDT)-structured radio frequency microelectromechanical system (RF MEMS) switch for RF applications. This SPDT switch has a very low insertion loss of 1.0 dB and a high isolation of 40 dB, up to 10 GHz. The fabricated switch is compact in size (5.2times3.0times1.8 mm3) with a Land Grid Array Package. The research and development of an RF MEMS...
This paper presents the use of phononic band gap (PBG) theory for the design of mass-spring networks that can be used for vibration stabilization in MEMS sensors and/or actuators that need to display wideband immunity to vibrations over frequencies at which mechanical noise may be present. A discrete PBG crystal is a mass-spring network designed to satisfy the condition that the masses vary periodically...
Recent years, growing interests had been paid to the studies on electrical tunable ferroelectric materials and devices. Research work had been focused mainly on several aspects: tunable mechanism [1??8], material selection [9??12], loss reduction and device fabrication [13??14]. Tunable mechanism is one of the most fundamental issues among the above ones. Although several analytical or hypothetical...
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