Investigations into Nonlinear Energy Sinks for a Stochastic Dynamical Oscillator
01 Jan 2021-pp 963-976
TL;DR: In this paper, a parametric sweep of the auxiliary nonlinear stiffness over a broad range of values has been done and the variations in primary vibration suppression and voltage generation by the nonlinear energy sinks have been observed for its corresponding values.
Abstract: The paper deals with Nonlinear Energy Sinks (NES), utilizing piezoelectric transduction mechanism, focusing on the degree of effect the auxiliary nonlinear stiffness has on the performance of the NES and the performance of NES with the primary system subjected to random excitation Hence, a parametric sweep of the auxiliary nonlinear stiffness over a broad range of values has been done and the variations in primary vibration suppression and voltage generation by the NES have been observed for its corresponding values It has been conducted with the NES attached to a linear primary system and then an essentially nonlinear one Comparison of results and validation of the performance of NES for both the cases have been performed Following that, performance of the NES has been investigated when a linear primary system is subjected to random excitation Two separate cases have been utilized to randomize the excitation Results regarding vibration control and voltage generated have been derived for both and compared to those obtained for deterministic excitation By and large, it is found that NES is successful in protecting a primary system and broadening the operation bandwidth, while satisfyingly generating voltage, irrespective of the type of excitation on the primary system
TL;DR: In this paper, a non-resonant piezomagnetoelastic energy harvester with high-energy orbits was proposed and investigated over a range of excitation frequencies.
TL;DR: In this paper, a nonlinear energy sink for energy harvesting using nonlinear vibration absorption and nonlinear nonlinearity is presented. But the experimental identification is conducted to determine several key parameters and relationships, and a computer simulation is carried out to investigate the apparatus's performance under transient responses in terms of vibration absorption.
TL;DR: In this article, a hybrid energy harvester combining piezoelectric and electromagnetic transduction mechanisms is designed to harvest vibration energy, which can harvest energy at a broad range of frequencies.
TL;DR: In this article, a nonlinear energy sink (NES) based PVEH was proposed to achieve broadband energy harvesting, which can absorb the vibration from the primary structure and collect electric energy within a broad frequency range effectively.
Abstract: A piezoelectric vibration energy harvester (PVEH) is capable of converting waste or undesirable ambient vibration energy into useful electric energy. However, conventional PVEHs typically work in a narrow frequency range, leading to low efficiency in practical application. This work proposes a PVEH based on the principle of the nonlinear energy sink (NES) to achieve broadband energy harvesting. An alternating current circuit with a resistive load is first considered in the analysis of the dynamic properties and electric performance of the NES-based PEVH. Then, a standard rectifying direct current (DC) interface circuit is developed to evaluate the DC power from the PVEH. To gain insight into the NES mechanism involved, approximate analysis of the proposed PVEH systems under harmonic excitation is sought using the mixed multi-scale and harmonic balance method and the Newton–Raphson harmonic balance method. In addition, an equivalent circuit model (ECM) of the electromechanical system is derived and circuit simulations are conducted to explore and validate the energy harvesting and vibration absorption performance of the proposed NES-based PVEH. The response is also compared with that obtained by direct numerical integration of the equations of motion. Finally, the optimal resistance to obtain the maximum DC power is determined based on the Newton–Raphson harmonic balance method and validated by the ECM. In general, the NES-based PVEH can absorb the vibration from the primary structure and collect electric energy within a broad frequency range effectively.
TL;DR: In this article, a novel piezoelectric energy-harvesting device was proposed based on the principle of nonlinear energy sink and the proposed device was tested in the real world.
Abstract: This article presents a novel piezoelectric energy-harvesting device. Different from the existing designs in the literature, the proposed device is based on the principle of nonlinear energy sink i...