Yingxian Lu

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New comb geometry of capacitive vibration energy harvesters miniaturizing the air damping effect

2017 IEEE 30th International Conference on Micro Electro Mechanical Systems (MEMS), 2017

We report a hierarchical hexahedral geometry of interdigited-comb MEMS capacitor for electrostati... more We report a hierarchical hexahedral geometry of interdigited-comb MEMS capacitor for electrostatic vibration energy harvesters (e-VEHs), where the air damping effect is greatly reduced while the capacitance variation remains important. Based on the same frequency up-conversion structure as in our previous design, the device with the new electrode geometry reaches a larger bandwidth (10∼180 Hz) in air compared to the classical gap-closing structure (80∼160 Hz). The energy extracted in air during each cycle of input excitation is 85 times higher than the classical design @15 Hz / 2 gpeak (20 V), and is no less than 33 times higher within 10∼40 Hz.

空気減衰効果を小型化容量性振動エネルギーハーベスタの新しい組合せ幾何学【Powered by NICT】

Optimisation of nonlinear MEMS electrostatic kinetic energy harvesters to enable self-powered structural health monitoring

Condition monitoring of gearboxes, a key element of rotating machines, has previously been perfor... more Condition monitoring of gearboxes, a key element of rotating machines, has previously been performed by analysing a shaft vibration data. This recorded vibration signal has distinct dominant frequencies that are stationary. The input signal with multiple dominant frequencies (including harmonics) could excite a kinetic nonlinear energy harvester and provide suﬃcient power for intelligent sensing. The nonlinear Electrostatic Kinetic Energy Harvesters (e-KEH) proposed in this paper could generate energy under low and high frequency excitation from shaft frequency and the harmonics, respectively. This paper reviews recent developments and challenges in designing MEMS e-KEH for Structural Health Monitoring (SHM), especially for gearboxes in aircraft engine. E-KEHs can have a silicon resonator, which is coupled with elastic silicon beams. Numerical predictive models of MEMS e-KEHs provide a tool to analyse the performance and eﬃciency of these harvesters. An analytical model of an impact...

Récolteuses d’énergie cinétique électrostatique (e-REC) à basse fréquence pour applications de communication RFID et électronique portable

Un nombre croissant d’appareils electroniques portatifs et portables entraine une demande croissa... more Un nombre croissant d’appareils electroniques portatifs et portables entraine une demande croissante de module d’alimentation electrique durable et localise de petite taille et de poids, et offrant une puissance de sortie elevee. En tant que choix prometteur pour l’alimentation electrique, les moissonneuses d’energie cinetiques (REC), qui transforment les vibrations ou les mouvements ambiants en energie electrique, sont etudiees de maniere intensive ces dernieres annees. Les performances des RECs miniatures disponibles dans la litterature sont generalement limitees par leur taille. Les vibrations ambiantes sont generalement abondantes en basse frequence, ce qui est egalement un facteur majeur limitant la puissance de sortie du REC. Afin d’ameliorer la puissance de sortie, nous devrions ameliorer l’efficacite de la conversion d’energie, qui est liee au principe de transduction. Ce travail presente l’amelioration de la puissance de sortie des RECs electrostatiques basse frequence grâc...

Low-frequency and ultra-wideband MEMS electrostatic vibration energy harvester powering an autonomous wireless temperature sensor node

2016 IEEE 29th International Conference on Micro Electro Mechanical Systems (MEMS), 2016

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Specific electromagnetic radiation in the wireless signal range increases wakefulness in mice

Proceedings of the National Academy of Sciences, 2021

Significance The steady increase of electromagnetic radiation (EMR) in the environment, particula... more Significance The steady increase of electromagnetic radiation (EMR) in the environment, particularly the wireless signal, causes serious public concern over its potential negative impact on health. However, it is challenging to examine such impact on human subjects due to associated complex issues. In this study, we establish an experimental system for the investigation of EMR impact on mice. Using this system, we uncovered a causal relationship between 2.4-GHz EMR modulated by 100-Hz square pulses and increased wakefulness in mice. This result identifies sleep alteration as a potential consequence of exposure to excessive wireless signals.

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Bennet's charge doubler boosting triboelectric kinetic energy harvesters

Journal of Physics: Conference Series, 2018

A power supply module for autonomous portable electronics: ultralow-frequency MEMS electrostatic kinetic energy harvester with a comb structure reducing air damping

Microsystems & Nanoengineering, 2018

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A flexible electrostatic kinetic energy harvester based on electret films of electrospun nanofibers

Smart Materials and Structures, 2017

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A conditioning circuit with exponential enhancement of output energy for triboelectric nanogenerator

Nano Energy, 2018

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Bennet's doubler working as a power booster for triboelectric nano-generators

Electronics Letters, 2018

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Understanding and modeling of triboelectric-electret nanogenerator

Nano Energy, 2018

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An Impact-Coupled MEMS Electrostatic Kinetic Energy Harvester and Its Predictive Model Taking Nonlinear Air Damping Effect Into Account

Journal of Microelectromechanical Systems, 2018

This paper describes a predictive and complete numeric model of a multi-mass and impact-coupled M... more This paper describes a predictive and complete numeric model of a multi-mass and impact-coupled MEMS electrostatic kinetic energy harvester (e-KEH). A silicon resonator is coupled with elastic silicon beams (acting as a part of stoppers) and a miniature metallic ball. The model considers all these impacts as well as the electromechanical force and catches the frequency-up and spring-softening effects. More importantly, for the first time, it models accurately the evolving and non-linear squeeze-film air damping effect in a gap-closing transducer, which is induced by the large amplitude of displacement of the silicon mass. The predictions provided by the model are compared with experimental results, showing a good consistency. The key parameters of the KEH are analyzed with the proposed model, which can be of great help for further design optimization of similar devices. [2018-0174]

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Design and test of a Bennet's doubler device with mechanical switches for vibrational energy harvesting

Journal of Physics: Conference Series, 2016

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A batch-fabricated electret-biased wideband MEMS vibration energy harvester with frequency-up conversion behavior powering a UHF wireless sensor node

Journal of Micromechanics and Microengineering, 2016

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A MEMS EVEH-Assisted Long-Range RFID Tag System for Applications with Low-Frequency Vibrations

Proceedings, 2017

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Performance Evaluation of a Long-Range RFID Tag Powered by a Vibration Energy Harvester

IEEE Antennas and Wireless Propagation Letters, 2017

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A paper-based electrostatic kinetic energy harvester with stacked multiple electret films made of electrospun polymer nanofibers

Journal of Physics: Conference Series, 2016

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In vitro cardiomyocyte-driven biogenerator based on aligned piezoelectric nanofibers

Nanoscale, Jan 15, 2016

Capturing the body's mechanical energy from the heart, lungs, and diaphragm can probably meet... more Capturing the body's mechanical energy from the heart, lungs, and diaphragm can probably meet the requirements for in vivo applications of implantable biomedical devices. In this work, we present a novel contractile cardiomyocyte (CM)-driven biogenerator based on piezoelectric nanofibers (NFs) uniaxially aligned on a PDMS thin film. Flexible nanostructures interact with the CMs, as a physical cue to guide the CMs to align in a specific way, and create mechanical interfaces of contractile CMs and piezoelectric NFs. As such, the cellular construct features specific alignment and synchronous contraction, which realizes the maximal resultant force to drive the NFs to bend periodically. Studies on contraction mapping show that neonatal rat CMs self-assemble into a functional bio-bot film with well-defined axes of force generation. Consequently, the biogenerator produces an average voltage of 200 mV and current of 45 nA at the cell concentration of 1.0 million per ml, offering a bioco...

Low-Frequency MEMS Electrostatic Vibration Energy Harvester With Corona-Charged Vertical Electrets and Nonlinear Stoppers

Journal of Physics: Conference Series, 2015

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