Three-dimensional resonating metamaterials for low-frequency vibration attenuation

The drilling operation is considered by manufacturers as complex and difficult process (rapid wear of the cutting edge as well as problems of chip evacuation). Faced with these failures, manufacturers have shifted in recent years towards the drilling process assisted by forced vibrations. This method consist to add an axial oscillation with a low frequency to the classical feed movement of the drill so as to ensure good fragmentation and better chip evacuation. This paper presents a model for prediction of cutting forces during a drilling operation assisted by forced low-frequency vibration. The model allows understanding the interaction between the tool and the workpiece and identifying numerically the three-dimensional evolution of the cutting force components generated by the vibratory drilling operation. The effects of cutting parameters, tool parameters and those of forced vibrations on the cutting forces distributions will be discussed.

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Modal analysis and demonstration of metastructure combining local resonators and an autonomous synchronized switch damping circuit

Journal of Low Frequency Noise Vibration and Active Control ◽

10.1177/14613484211068244 ◽

2022 ◽

pp. 146134842110682

Author(s):

Haruhiko Asanuma ◽

Sumito Yamauchi

Keyword(s):

Modal Analysis ◽

Low Frequency ◽

Coupled Analysis ◽

Resonant Vibration ◽

Power Sources ◽

Low Frequency Vibration ◽

Vibration Attenuation ◽

Signal Processors ◽

Coupled Equation ◽

Frequency Axis

A locally resonant metastructure is a promising approach for low-frequency vibration attenuation, whereas the attachment of many resonators results in unnecessary and multiple resonance outside the bandgap. To address this issue, we propose a damping metastructure combining local resonators and an autonomous synchronized switch damping circuit. On the basis of modal analysis, we derive an electromechanically coupled equation of the proposed metastructure. The piezo ceramics, which are attached on a small portion of the metastructure and connected to the circuit, remarkably decrease the magnitude of the resonant vibration with no extra sensors, signal processors, or power sources. The displacement at unnecessary resonance was decreased by approximately 75%. The results of the coupled analysis were similar to the experimentally observed results in terms of the location and width of the bandgap on the frequency axis and the decreased displacement for the circuit. The proposed technique can overcome the disadvantage of the metastructure.

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Multifunctional Energy Harvesting Locally Resonant Metastructures

Volume 1: Development and Characterization of Multifunctional Materials; Mechanics and Behavior of Active Materials; Bioinspired Smart Materials and Systems; Energy Harvesting; Emerging Technologies ◽

10.1115/smasis2017-3951 ◽

2017 ◽

Cited By ~ 1

Author(s):

Christopher Sugino ◽

Vinciane Guillot ◽

Alper Erturk

Keyword(s):

Energy Harvesting ◽

Low Power ◽

Electrical Power ◽

Flexible Structures ◽

Low Frequency ◽

Load Resistance ◽

Modeling Framework ◽

Energy Harvesters ◽

Low Frequency Vibration ◽

Vibration Attenuation

Vibration-based energy harvesting is a growing field for generating low-power electricity to use in wireless electronic devices, such as the sensor networks used in structural health monitoring applications. Locally resonant metastructures, which are structures that comprise locally resonant metamaterial components, enable bandgap formation at wavelengths much longer than the lattice size, for critical applications such as low-frequency vibration attenuation in flexible structures. This work aims to bridge the domains of energy harvesting and locally resonant metamaterials to form multifunctional structures that exhibit both low-power electricity generation and vibration attenuation capabilities. A fully coupled electromechanical modeling framework is developed for two characteristic systems and their modal analysis is presented. Simulations are performed to explore the vibration and electrical power frequency response maps for varying electrical load resistance, and optimal loading conditions are presented. Case studies are presented to understand the interaction of bandgap formation and energy harvesting capabilities of this new class of multifunctional energy-harvesting locally resonant metastructures. It is shown that useful energy can be harvested from the locally resonant metastructure without significantly diminishing their dramatic vibration attenuation in the locally resonant bandgap. Thus, by integrating energy harvesters into a locally resonant metastructure, there is new potential for multifunctional self-powering or self-sensing locally resonant metastructures.

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Preliminary Studies for Precision Polishing of Micro Structured Mold by Using Three-Dimensional Low Frequency Vibration Utilizing Piezoelectric Actuator Incorporated with Mechanical Amplitude Magnified Mechanism

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.565.231 ◽

2012 ◽

Vol 565 ◽

pp. 231-236 ◽

Cited By ~ 2

Author(s):

Sze Keat Chee ◽

Hirofumi Suzuki ◽

Junichi Uehara ◽

Takeshi Yano ◽

Toshiro Higuchi

Keyword(s):

Piezoelectric Actuator ◽

Control Method ◽

Three Dimensional ◽

Low Frequency ◽

Sine Wave ◽

Work Piece ◽

Time Control ◽

Low Frequency Vibration ◽

Increasing Demand ◽

Polishing Tool

Precision polishing of micro structured mold has been highly demanded due to the increasing demand for optics manufacturing such as solar optics and DVD pick-up system, and medical devices like μ-TAS [1-5]. These micro structured molds usually have complicated structure and need to be polished after grinding or cutting. In this paper, a three-axis low frequency vibration (3DLFV) polishing actuator is proposed. The actuator consists of 3 multilayers-stacked piezoelectric actuators (PZT) incorporated with mechanical amplitude magnified mechanism. The mechanical amplitude magnified mechanism utilizes mechanical structures which is also called mechanical transformer, which is capable to elongate the stroke of the piezoelectric actuator to almost 13 times to 225 m. By driving the PZT in sine wave with particular phase different, dual direction trajectory such as circle can be achieved, and is proved to be effective in precision mold polishing [8]. With the 3DLFV actuations, polishing tool with polyurethane is actuated to stir the diamond slurry to achieve polishing effects. In polishing experiments, nickel-plating metal used as work pieces are polished with diamond slurry and the polished depths are measured. As a result, three-axis low frequency vibration (3DLFV) is proposed and developed. Its capability in polishing precise mold is studied and confirmed to be efficient. In order to improve the work piece surface, a dwell time control method can be applied with the 3DLFV.

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Low frequency vibration suppression of a moderate thick cabin structure by multiple piezoelectric patches shunted with RL-double negative capacitance circuits

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-1807 ◽

2021 ◽

Vol 263 (5) ◽

pp. 1299-1307

Author(s):

Zhiwei Zheng ◽

Feng Li ◽

Xiuchang Huang ◽

Zhiwei Su ◽

Hongxing Hua

Keyword(s):

Electromechanical Coupling ◽

Vibration Suppression ◽

Three Dimensional ◽

Low Frequency ◽

Electromechanical Coupling Coefficient ◽

Double Negative ◽

Low Frequency Vibration ◽

Dimensional Finite Element ◽

Trial And Error Method ◽

Three Dimensional Finite Element

Multiple piezoelectric patches shunted with RL-double negative capacitances circuits, which are bonded on the bulkhead, are proposed to control the resonant response of multiple low frequency modes of a moderate thick cabin structure. Dynamic modeling of the electromechanical coupling system of the cabin structure and the piezoelectric shunt circuit is established by employing the three-dimensional finite element. Optimum tuning strategy is based on the trial and error method. It is shown that the proposed approach is effective in enhancing the generalized electromechanical coupling coefficient and controlling the low frequency modes that exhibits coupled deformation of the bulkhead and cabin structure.

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Vibration Analysis and Modeling of an Off-Road Vibratory Roller Equipped with Three Different Cab’s Isolation Mounts

Shock and Vibration ◽

10.1155/2018/8527574 ◽

2018 ◽

Vol 2018 ◽

pp. 1-17 ◽

Cited By ~ 13

Author(s):

Vanliem Nguyen ◽

Jianrun Zhang ◽

Vanquynh Le ◽

Renqiang Jiao

Keyword(s):

Dynamic Model ◽

Ride Comfort ◽

Three Dimensional ◽

Low Frequency ◽

Operating Conditions ◽

Experimental Investigations ◽

Nonlinear Dynamic Model ◽

Obvious Effect ◽

Low Frequency Vibration ◽

Power Spectral

This study proposes a dynamic model of the vibratory roller interacting with the off-road deformed terrain to analyze the low-frequency performance of three different cab’s isolation mounts under the different operating conditions. In order to evaluate the ride comfort of the vibratory roller with the different cab’s isolation mounts, a three-dimensional nonlinear dynamic model is established. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver’s seat, cab’s pitch, and roll vibrations are chosen as objective functions in the low-frequency range. Contrastive analysis of low-frequency vibration characteristics of the vibratory roller with the traditional rubber mounts, the hydraulic mounts, and the pneumatic mounts is carried out. Experimental investigations are also used to verify the accuracy of models. The research results show that the hydraulic mounts have an obvious effect on mitigating the cab vibration and improving the ride comfort in comparison with the traditional rubber mounts and the pneumatic mounts.

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