Simultaneous vibration control and energy harvesting of vehicle suspensions have attracted significant research attention over the past decades. However, existing shock absorbers (EHSAs) are mainly designed based on principle linear resonance, thereby compromising suspension performance for high-efficiency being only responsive to narrow bandwidth vibrations. In this paper, we propose a new EHSA design -- inerter pendulum absorber (IPVA) that integrates an electromagnetic rotary with...

The energy harvesting backpack that converts the kinetic produced by vertical oscillatory motion of suspended loads to electricity during normal walking is a promising solution fulfill ever-rising need electrical power for use electronic devices in civilians and military. An based on mechanical rectification (MMR) developed this paper. Unlike conventional rack-pinion mechanism used backpacks, MMR has two pinions are mounted generator shaft via one-way bearings way bidirectional load...

This paper presents a novel double salient motor design in which the permanent magnets are implanted stator to provide additional magnetic flux sources for enhancing its performance and reducing inherent cogging torque. The feasible cones method is adopted calculate dimensional sizes of proposed short path motor. assembled stators concept employed paths magnet (DSPM) also transfer heat generated by windings outside Due nonlinear properties doubly structure, this utilizes both circuit...

Broad frequency bandwidth is a desired feature for most energy harvesting systems. Rotational electromagnetic generators are widely used in systems and the generator rotor considered as an inerter. While lot of research striving increasing bandwidth, we found out that inerter makes narrow. To solve this problem, paper proposes using inertia nonlinearity which realized by mechanical motion rectification (MMR). The influence MMR on performance inerter-based was numerically experimentally...

In many vibration energy harvesting systems, the stroke is limited by physical space constraint. Furthermore, when using an oscillating backpack to harvest from human walking, of great concern comfort. this paper, a nonlinear inerter-based two degrees freedom (2DOF) system that can large power at proposed. The inerter nonlinearity achieved adding mechanical motion rectifier (MMR) system. design and modeling 2DOF device are explained in detail. then converted analogous electrical model for...

Stochastic resonance is referred to as a physical phenomenon that manifest in nonlinear systems whereby weak periodic signal can be significantly amplified with the aid of inherent noise or vice versa. In this paper, stochastic considered harvest energy from two typical vibrations rotating shafts: random whirl vibration and stick-slip vibration. Stick-slip impose constant offset centrifugal force distort potential function harvester, leading asymmetry. A numerical analysis based on finite...

Abstract Magnetic plucking is an enabling technique to harvest energy from a rotary host as it converts the low-frequency excitation of rotational sources high-frequency that leads resonance small-scale piezoelectric harvesters. Traditional nonlinear analysis phenomenon has relied on numerical integration methods. In this work, semi-analytical method developed investigate stability and bifurcation behaviors magnetic plucking, which integrates second-order perturbation discrete Fourier...

Abstract The inerter pendulum vibration absorber (IPVA) is integrated between a spar and an annulus floater using ball-screw mechanism to study its wave energy conversion potential. Hydrodynamic stiffness, added mass, radiation damping effects on the spar-floater system are characterized boundary element method. It found that 1:2 internal resonance via period-doubling bifurcation in responsible for nonlinear transfer absorber. This occurs when primary harmonic solution of becomes unstable...

In this short paper, we report a design of an energy harvesting backpack with mechanical motion rectifier (MMR). Also, the experiment studies conducted on two male subjects who carry types backpacks, including MMR-based and traditional backpack, while walking treadmill at 3 3.5 mph. The harvested power backpacks shunted different resistors are reported each speed to demonstrate high efficiency harvester. During tests, harvest generated more regardless speeds resistor values. Finally, maximum...

This study assessed the ability of resonance frequency measurements to differentiate stability implants with different lengths and diameters, in densities bone. Another objective was identify an alternative parameter capable quantifying dental implant stability, thus facilitating greater sensitivity for efficacious detection compromised or failing implants.Implants two diameters (4 5 mm) six were individually placed synthetic bone blocks three (15, 40/20, 40 pounds per cubic foot)...

Abstract The inerter has been integrated into various vibration mitigation devices, whose mass amplification effect could enhance the suppression capabilities of these devices. In current study, is with a pendulum absorber, referred to as absorber (IPVA). To demonstrate its efficacy, IPVA linear, harmonically forced oscillator seeking mitigation. A theoretical investigation conducted understand nonlinear response IPVA. It shown that operates based on energy transfer phenomenon wherein linear...

Abstract This work investigates the vibration suppression and energy harvesting capabilities of an inerter pendulum absorber (IPVA) when applied to a single degree freedom structure subjected Gaussian broadband base excitation which was analytically treated as white noise. An IPVA previously studied by authors attached DC generator experimentally investigate mitigation device in connection with P-bifurcation. A formal characterization system’s unknown parameters done all measured,...

This paper presents a broadband vibration energy harvester (VEH) which consists of monostable Duffing oscillator connected to an electromagnetic generator via mechanical motion rectifier. The rectifier converts the bidirectional vibratory induced by ambient environment vibrations into unidirectional rotation and causes periodically switch between large- small-inertia system, resulting in nonlinearity inertia. By means analytical numerical methods, this inertia is shown have two advantages....

Simultaneous vibration control and energy harvesting of vehicle suspensions has attracted great research interests over the past decades. However, existing frameworks tradeoff suspension performance for recovery are only responsive to narrow-bandwidth vibrations. In this paper, a new energy-regenerative absorber (ERVA) using ball-screw mechanism is investigated. The ERVA system based on rotary electromagnetic generator with adjustable nonlinear rotational inertia which passively increases...

Energy harvesting from smart tire has been an influential topic for researchers over several years. In this paper, we propose novel energy harvester taking advantage of adaptive tuning stochastic resonance. Compared to previous harvesters, it can generate large power and wide bandwidth. Large is achieved by resonance while wide-bandwidth accomplished via centrifugal stiffening effect. configuration modulated noise described first. It electromagnetic consists rotating beam subject buckling....

Abstract The inerter is referred to as a two-terminal device that provides inertial forces proportional the relative accelerations between its two terminals. It has been widely applied in vibration control due mass amplification effect. In this paper, new inerter-based damper proposed take advantage of effect, which consists classic rack-pinion conjunction with torsional tuned damper. Unlike any other topologies dampers, connected pinion via rotational spring and viscous As result, weight...

In this paper, we conduct experimental, theoretical, and numerical studies of a lead-zirconate-titanate (PZT) thin-film microactuator probe submerged in water. The major component the actuator is PZT diaphragm anchored on four silicon sidewalls. There also residue at juncture sidewalls due to imperfect etching processes. experimental study, frequency response functions displacement are measured via laser Doppler vibrometer spectrum analyzer. measurements show that first natural reduces from...