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Pedestrian walking characteristics at stairs according to width change for application of piezoelectric energy harvesting

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Journal of Central South University 2012年第3期19卷 764-769页

作者： YI Mi-hui NA Wook-jung HONG Won-hwa JEON Gyu-yeob School of Architecture and Civil Engineering Kyungpook National University Daegu 702-701 South Korea Department of Architecture Jeju National University Jeju 690-756 South Korea

This work aims at finding pedestrian walking characteristics at U-type stairs according to the width change of stairs and appropriate spot for installing piezoelectric energy *** number of pedestrian at two kinds of stairs(one is stairs with 1.5 m in width and the other is stairs with 3 m in width) was estimated by calculating the number of steps on the stairs by a zone which is divided into 30 cm×30 *** result shows high density in the middle in the case of narrow stairs but traffic is concentrated on stair inside(pillar side) in stairs with large *** conclusion,the location for installation of piezoelectric energy harvesting system should be considered differently on stairs width and the number of installation depends on total expected traffic and the expected traffic for a device.

关键词： piezoelectric energy harvesting pedestrian walking human power traffic distribution

A self-powered piezoelectric energy harvesting interface circuit with efficiency- enhanced P-SSHI rectifier

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Journal of Semiconductors 2018年第4期39卷 55-65页

作者： Lianxi Liu Yanbo Pang Wenzhi Yuan Zhangming Zhu Yintang Yang School of Microelectronics Xidian University Xi'an 710071 China Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices Xi'an 710071 China

The key to self-powered technique is initiative to harvest energy from the surrounding environment. harvesting energy from an ambient vibration source utilizing piezoelectrics emerged as a popular method. Effi- cient interface circuits become the main limitations of existing energy harvesting techniques. In this paper, an inter- face circuit for piezoelectric energy harvesting is presented. An active full bridge rectifier is adopted to improve the power efficiency by reducing the conduction loss on the rectifying path. A parallel synchronized switch harvesting on inductor （P-SSHI） technique is used to improve the power extraction capability from piezoelectric harvester, thereby trying to reach the theoretical maximum output power. An intermittent power management unit （IPMU） and an output capacitor-less low drop regulator （LDO） are also introduced. Active diodes （AD） instead of tradition- al passive ones are used to reduce the voltage loss over the rectifier, which results in a good power efficiency. The IPMU with hysteresis comparator ensures the interface circuit has a large transient output power by limiting the output voltage ranges from 2.2 to 2 V. The design is fabricated in a SMIC 0.18/~m CMOS technology. Simulation results show that the flipping efficiency of the P-SSHI circuit is over 80% with an off-chip inductor value of 820/zH. The output power the proposed rectifier can obtain is 44.4/~W, which is 6.7x improvement compared to the maximum output power of a traditional rectifier. Both the active diodes and the P-SSHI help to improve the output power of the proposed rectifier. LDO outputs a voltage of 1.8 V with the maximum 90% power efficiency. The proposed P-SSHI rectifier interface circuit can be self-powered without the need for additional power supply.

关键词： self-powered piezoelectric energy harvesting P-SSHI power management active diode LDO

piezoelectric energy harvesting From Asphalt Pavements Deformation Under Various Traffic Flows

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Piezoelectric Energy Harvesting From Asphalt Pavements Defor...

2018年全国固体力学学术会议

作者： Yangyang Zhang Yisheng Chen 吕朝锋 Ji Wang Department of Civil Engineering Zhejiang University Faculty of Mechanical Engineering and Mechanics Ningbo University

piezoelectric energy harvesting from asphalt pavements deformation has received much attention due to potential applications on self-powered monitoring systems for roads, bridges or other civil infrastructure facilities. The influences of weight and speed of a single vehicle load on the open-circuit voltage of the harvesters have been investigated experimentally by many researchers. However, the output power, key measures for evaluating the efficiency of these harvesters, were ignored in many in-situ and laboratory experimental studies. So the quantitative dependence of output power upon the parameters of this kind of energy harvesters and traffic flows is still unclear, which brings great challenges for the energy harvesting systems designation in practical applications. In this study, a generalized theoretical model is developed to calculate and optimize the output power of piezoelectric energy harvesters embedded in asphalt pavements under the two most common traffic flow conditions, e.g. urban roads and highway roads. By employing the scaling law methodology, we find that distinguished strategies exit for optimization the output power of the energy harvesters under aforementioned two traffic flow conditions. The result of this paper may provide a generalized guideline for designation of piezoelectric energy harvesting systems under various traffic flows.

关键词： piezoelectric energy harvesting Asphalt pavement Traffic flow

DECOUPLED METHOD FOR piezoelectric energy harvesting FROM BASE EXCITATION, GALLOPING, AND AUTOPARAMETRIC VIBRATION

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DECOUPLED METHOD FOR PIEZOELECTRIC ENERGY HARVESTING FROM BA...

第十届动力学与控制学术会议

作者： TAN Ting YAN Zhi-miao School of Astronautics Harbin Institute of Technology

The piezoelectric effect converts mechanical strain into electric current or voltage. piezoelectric energy harvesting from mechanical vibrations has received attention because of its ease of application and its suitability for designing MEMS devices and wireless sensors. A bimorph piezoelectric cantilever beam utilizing two piezoelectric sheets bounded to both sides of the cantilever beam is used to harvest the energy. This paper for the first time presents a simplified way to compute the harvested power using only the mechanical governing equation but also considering the mechanical-electric coupling effect, for piezoelectric energy harvester from base excitation, galloping-based, and autoparametric-based vibrations. The effects of the electrical load resistance on the global frequency and damping ratio from a linear analysis of the coupled electromechanical problem is determined. The mechanical-electric coupling effect is then taken into account by using such modified globe frequency and damping ratio in the mechanical governing equation. The harvested power and tip displacement under different electric load resistant vary by the base acceleration, wind speed, and external force, respectively for the base excitation(Figure 1(a)), galloping(Figure 1(b)) and autoparameteric vibration(Figure 1(c)). Compared with numerical results solved from mechanical and electric governing equations, our simplified method gives satisfied ***, we solve the mechanical governing equation analytically after substituting in the modified global frequency and damping ratio. The harvested power and tip displacement are then computed directly using the modified parameters. The results are consistent with the numerical results. The effects of the piezoelectric coupling term and the capacitance of the harvester on the harvested power and tip displacement are discussed.

关键词： piezoelectric energy harvesting base excitation galloping autoparametric vibration mechanical-electric decoupling

DETAILED ANALYSIS AND OPTIMIZED DESIGN OF piezoelectric energy harvesting CIRCUIT

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DETAILED ANALYSIS AND OPTIMIZED DESIGN OF PIEZOELECTRIC ENER...

2013全国压电和声波理论及器件技术研讨会

作者： Yi-hua HUANG Qing-lei WANG School of Information Science and Technology Sun Yat-sen University

The synchronized switch harvesting on inductor(SSHI)interface circuit can greatly enhance the output power of the piezoelectric harvesting system and therefore has been investigated ***,the influences of the inductor L and the closing duration timeof the switch S on the output power of the SSHI interface circuit have not been pointed *** design constraints on L andimposed by the non-idealities in the SSHI circuit,the piezoelectric element and the load have been overlooked in the past *** paper tends to solve these issues and to carry out a detailed *** useful laws for SSHI interface circuit design considering the non-idealities in the non-linear processing circuit,the piezoelectric element and the load have been found.

关键词： piezoelectric energy harvesting Non-linear processing circuit SSHI

Characterization the influences of diodes to piezoelectric energy harvester

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International Journal of Smart and Nano Materials 2018年第3期9卷 151-166,I0001页

作者： Ming Yuan Ziping Cao Jun Luo School of Automation Nanjing University of Posts and TelecommunicationsNanjingP.R.China School of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjingP.R.China

This study discloses the diode’s influences on the piezoelectric energy harvesting *** piezoelectric-based energy harvesting system plays an important role in scavenging environment vibration energy into electrical energy,which can be utilized by low-power electronic *** respect to the interface circuit,a full-wave bridge circuit is usually needed to rectify the alternating current(AC)signal into a direct current(DC)*** full-wave bridge is composed of four diodes,whose characteristics may influence the harvested power ***,in this paper,the diodes’properties and influences on the energy harvesting performance are analyzed and presented via simulation and experimental *** is found the harvested energy has close relationship with the diode *** the high source impedance case,diode with low reverse leakage current is *** the low source impedance case,diode with low forward voltage drop is *** corresponding experimental study is carried out via a piezoelectric beam,which shows that the measured harvested power differences can almost be up to 800%for the same test structure.

关键词： piezoelectric energy harvesting diode’s influence power evaluation

Wireless Self-Powered Vibration Sensor System for Intelligent Spindle Monitoring

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Structural Durability & Health Monitoring 2023年第4期17卷 315-336页

作者： Lei Yu Hongjun Wang Yubin Yue Shucong Liu Xiangxiang Mao Fengshou Gu Intelligent Sensing and Control of High-End Equipment Beijing International Science and Technology Cooperation Base Beijing Information Science and Technology UniversityBeijing100192China Machinery Technology Development Co Ltd.Beijing100044China Centre for Efficiency and Performance Engineering University of HuddersfieldQueensgateHuddersfieldWest YorkshireHD1-3DHUK

In recent years,high-end equipment is widely used in industry and the accuracy requirements of the equipment have been risen year by *** the machining process,the high-end equipment failure may have a great impact on the product *** is necessary to monitor the status of equipment and to predict fault *** present,most of the condition monitoring devices for mechanical equipment have problems of large size,low precision and low energy utilization.A wireless self-powered intelligent spindle vibration acceleration sensor system based on piezoelectric energy harvesting is *** on rotor sensing technology,a sensor is made to mount on the tool holder and build the related ***,the energy management module collects the mechanical energy in the environment and converts the piezoelectric vibration energy into electric energy to provide 3.3 Vfor the subsequent *** lithium battery supplies the system with additional power and monitors’the power of the energy storage circuit in ***,a three-axis acceleration sensor is used to collect,analyze and filter a series of signal processing operations of the vibration signal in the *** signal is sent to the upper computer by wireless *** host computer outputs the corresponding X,Y,and Z channel waveforms and data under the condition of the spindle speed of 50∼2500 r/min with real-time *** KEIL5 platform is used to develop the system *** small-size piezoelectric vibration sensor with high-speed,high-energy utilization,high accuracy,and easy installation is used for spindle *** experiment results show that the sensor system is available and practical.

关键词： Condition monitoring self-powered vibration acceleration sensor piezoelectric energy harvesting wireless transmission

Power Source for Wireless Sensors in Pipes

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Journal of Civil Engineering and Architecture 2016年第8期10卷 946-954页

作者： Sherif Keddis Norbert Schwesinger Microstructured Mechatronical Systems Technical University of Munich Munich D 80333 Germany

In this paper, we present investigations on energy harvesters for wireless sensors inside pipes. The harvesters are of flexible piezoelectric PVDF （Poly-Vinylidene-Di-Fluoride） and aluminum-foils as electrodes. The layers were stacked alternating on each other and wound to a spool. An LDPE （low-density polyethylene）-film wraps the spool and prevents the inflow of liquids. A ring shaped bluff body was placed inside the pipe to induce turbulence in the fluid stream. As the harvesters have been arranged downstream of the bluffbody, they were forced to oscillate independent of the media. This led to a polarization and a separation of electrical charges. Experiments were carried out in a wind channel as well as in a water pipe. In air, the spool oscillates with a frequency of about 30 Hz, at a wind speed of about 7 m/s. A voltage of about 4 V （peak-peak） was measured. This delivers in case of impedance adjustment power values of about 0.54 p.W. In water, oscillation starts at a speed above 0.6 m/s. The average oscillation frequency is about 18 Hz. At a velocity of 0.74 m/s, a peak-peak-voltage up to about 2.3 V was found. In case of impedance adjustment, the power was about 0.33 μW. This power is stored in a capacitor. Assuming a data transmission unit consumes about 0.2 mWs during one operational period of I s, the duty cycle can be calculated to about 6.2 min for air harvesting and 10.1 min for harvesting in water.

关键词： piezoelectric energy harvesting pipe PVDF-spool bluff body air water.

energy harvesting FROM HUMAN MOTION BY IMPULSE-EXCITED BISTABLE BUCKLED BEAMS

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ENERGY HARVESTING FROM HUMAN MOTION BY IMPULSE-EXCITED BISTA...

2016年全国压电和声波理论及器件应用研讨会

作者： Zheng-qiu XIE Wen-bin HUANG The State Key Lab of Mechanical Transmissions Chongqing University

Background, Motivation and Objective energy harvesting from human motion faces with challenges including low-frequency and non-harmonic excitation. With the nonlinear energy harvesting devices having been verified to exhibit better performance over a broad frequency spectrum, the impulsively-excited bistable vibration energy harvesting systems are suitable to harvest impulsive energies from human motion. Statement of Contribution/Methods This paper presents a novel impulse-excited energy harvesting system using a bilayer structure which is composed of a buckled piezoelectric beam and a rubber plate with a certain spatial separation. When the rubber plate is excited by the low frequency human gait impulse, it would touch the buckled piezoelectric beam and trigger the snap-through vibration of the beam through the up-conversion mechanism. The system presents two nonlinear properties, including the piecewise interaction between the bilayer structure and the buckled nonlinearity, respectively. The electromechanical response of the proposed shoe-installed nonlinear energy harvesting system under the standard low-frequency and non-harmonic gait excitation is studied by numerical simulations. The appearances of the chaotic and periodic responses of the energy harvesting systems with different physical parameters are illustrated by the phase portraits, the bifurcation diagram, and the 0-1 test approach. Results The influences of physical parameters including the mechanical properties of the materials, separation distance of the bilayer structure and the excitation frequency are examined respectively. In order to maximize the power output of the nonlinear system, optimized physical parameters values are obtained to achieve a high energy periodic vibration of the buckled piezoelectric beam. Compared with intrawell and chaotic oscillations, such high energy periodic interwell vibrations are demonstrated to greatly improve the energy harvesting performance. Discussion and Concl

关键词： piezoelectric energy harvesting Nonlinear system Impulse excitation