Yumei Wen

Chongqing University, Ch’ung-ch’ing-shih, Chongqing Shi, China

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Publications (178)238.73 Total impact


  • No preview · Article · Jan 2016 · IEEE Transactions on Magnetics
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    ABSTRACT: This work has demonstrated a novel piezoelectricenergy harvester without a complex structure and appended component that is capable of scavenging vibration energy from arbitrary directions with multiple resonant frequencies. In this harvester, a spiral-shaped elastic thin beam instead of a traditional thin cantilever beam was adopted to absorb external vibration with arbitrary direction in three-dimensional (3D) spaces owing to its ability to bend flexibly and stretch along arbitrary direction. Furthermore, multiple modes in the elastic thin beam contribute to a possibility to widen the working bandwidth with multiple resonant frequencies. The experimental results show that the harvester was capable of scavenging the vibration energy in 3D arbitrary directions; they also exhibited triple power peaks at about 16 Hz, 21 Hz, and 28 Hz with the powers of 330 μW, 313 μW, and 6 μW, respectively. In addition, human walking and water waveenergies were successfully converted into electricity, proving that our harvester was practical to scavenge the time-variant or multi-directional vibration energies in our daily life.
    Preview · Article · Jan 2016 · Review of Scientific Instruments
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    ABSTRACT: In this study, a piezoelectric wind energy harvester was demonstrated, which aimed at addressing the limitations of the existing approaches including single-directional operation and narrow working wind speed range. In the harvester, an arc-shaped elastic beam, instead of conventional thin cantilever beams, was adopted to extract wind energy. Benefiting from the beam's characteristics of arc-shaped structure and elasticity, the harvester is capable of scavenging wind energy without any extra accessory and responding to multi-directional wind excitations. An analytical model was established to investigate the effects of wind direction and structural parameters on the electrical output. In test, the harvester worked efficiently with wind coming from four directions in a speed range of 2-17 m/s and produced a maximum open-circuit voltage up to 34 V. When connected to an external load of 15 kΩ, the harvester showed a peak output power of 1.73 mW at 17 m/s. In addition, 18 serial-connected commercial light-emitting diodes (LEDs) were lit up simultaneously at the wind speed of 10.5 m/s, which confirmed the practicability of the harvester.
    No preview · Article · Nov 2015 · Sensors and Actuators A Physical
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    ABSTRACT: We reported a giant self-biased converse magnetoelectric (CME) effect in laminated composites consisting of graded-magnetostrictive FeCuNbSiB/FeGa/FeCuNbSiB layers sandwiched between two electro-parallel-connected PZT piezoelectric plates. The great different magnetic characteristics (such as magnetic permeability and coercivity) in FeGa and nanocrystalline foil FeCuNbSiB result in a large internal magnetic field and remanent piezomagnetic coefficient in FeCuNbSiB/FeGa/FeCuNbSiB, which account for the giant self-biased CME effect. The experimental results show that: (i) a large remnant CME coefficient of 2.228×10-3mGs·cm/V is achieved, which can be used for realizing miniature electrically controlled magnetic flux devices; (ii) the dynamic switching of magnetic flux between bistable states in PZT/FeCuNbSiB/FeGa/FeCuNbSiB/PZT through a smaller ac voltage (1Vrms) controlling is realized; and (iii) the induced magnetic induction B has an excellent linear relationship with applied ac voltage Vin.
    No preview · Article · Nov 2015 · IEEE Transactions on Magnetics
  • Jing Qiu · Yumei Wen · Ping Li
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    ABSTRACT: In this paper, a series of FeCuNbSiB/Terfenol-D/PZT (F/M/P) multiphase laminate heterostructures is presented, whose magnetoelectric (ME) coupling characteristics have been investigated. Compared with the traditional Terfenol-D/PZT (M/P) composites, the ME coupling characteristics of the proposed F/M/P heterostructures were significantly improved. The resonant and low-frequency ME voltage coefficient of the F/M/P heterostructures could be tuned by controlling the layers number N. In addition, the ME field coefficient of F/M/P heterostructures increases sharply and tends asymptotically toward a certain limiting value with the increase of thickness ratio tm/tp. When N is 7 (FMPMPMF), the maximum value of resonant ME voltage coefficient achieves 8.69 V/Oe, which is ∼3.65times higher than that for FMP, 1.81 times higher than that for FMPMF. Meanwhile, the maximum value of low-frequency ME voltage coefficient for FMPMPMF heterostructures achieves 69.6 mV/Oe at Hb = 378 Oe. Remarkably, it indicates that the F/M/P heterostructures have great potential as far as its application in highly sensitive dc magnetic field sensing and vibration energy harvesting.
    No preview · Article · Nov 2015 · IEEE Transactions on Magnetics
  • Jing Qiu · Xin Liu · Hengjia Chen · Xiaoyu Xu · Yumei Wen · Ping Li
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    ABSTRACT: In this paper, an electromagnetic (EM) vibration energy harvester (VEH) employing the Halbach arrays magnetic circuits to convert a low-frequency vibration energy into an electrical energy is presented. The VEH is made up of the Halbach arrays magnetic circuits, a coil, and a cantilever beam. The Halbach arrays magnetic circuits can concentrate the magnetic field on one side while canceling out the magnetic field on the other side. An analytical model is developed to analyze the distribution of the magnetic field of the Halbach arrays magnetic circuits. The electric output performances of the VEH have been investigated. Compared with the traditional EM VEH, the proposed VEH can significantly increase output power and power density. When coil diameter d , turns number N , and cantilever length Lc are 20 mm, 1400, and 80 mm, we obtain the optimum output power of 90.35 mW and the power density of 0.55 mW/cm3 at 12.65 Hz under 0.5 g, respectively. Remarkably, the proposed low-frequency resonant EM VEH employing the Halbach arrays has great potential for applying in intelligent wireless sensor networks.
    No preview · Article · Nov 2015 · IEEE Transactions on Magnetics
  • Xiaoyu Xu · Jing Qiu · Yumei Wen · Ping Li · Hengjia Chen · Xin Liu
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    ABSTRACT: In this paper, large zero-biased magnetoelectric (ME) effects are experimentally demonstrated in a five-phase laminate composite consisting of high-permeability Fe-based soft magnetic alloy FeCoV, giant magnetostrictive material Terfenol-D, and piezoelectric ceramic Pb(Zr1-x, Tix)O3 (PZT). The coupling effects between FeCoV and Terfenol-D result in a build-in magnetic bias due to their different magnetic permeability and coercivity. As a result, an obvious increase in resonant ME voltage coefficient (MEVC) at zero dc magnetic bias field (Hdc) for FeCoV/Terfenol-D/PZT/Terfenol-D/FeCoV (FMPMF) composite is obtained. The experimental results demonstrate that the optimum zero-biased resonant MEVC ( α ME ,r of FMPMF composites with three-layer FeCoV foils can reach 19.6 V/cm Oe, which is 1.75 times as great as that of traditional Terfenol-D/PZT/Terfenol-D (MPM) laminate composites. A low-frequency MEVC ( α ME, l of 176 mV/cm Oe is achieved, which is 2.45 times higher than that of the MPM laminate composites. The induced zero-biased ME voltage of FMPMF laminate composite shows an excellent linear relationship to ac magnetic field both at the low frequency (1 kHz) and the resonance frequency (115.14 kHz) over a wide range. This laminate composite shows promising applications for high-sensitivity and small-size magnetic-sensing devices without bias.
    No preview · Article · Nov 2015 · IEEE Transactions on Magnetics
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    ABSTRACT: We designed a magnetoelectric (ME) composite by bonding the graded-magnetostrictive layers of FeCuNbSiB/FeNi-ferromagnetic constant elasticity (FACE) on the output section of the Rosen-type transformer, in which a much higher self-biased converse magnetoelectric (CME) coefficient is obtained. Due to the different magnetic characteristics of nanocrystalline foil FeCuNbSiB and FeNi-FACE (such as magnetic permeability and coercivity), the FeCuNbSiB/FeNi-FACE layer exhibits an internal magnetic bias field. When the ac voltage is applied on the input section of the transformer, a large strain is mechanically transferred to the graded-magnetostrictive layers due to the stress concentration effect at full-wavelength resonance frequency. Therefore, the large strain in the output section of the Rosen-type transformer associated with the internal magnetic bias field in FeCuNbSiB/FeNi-FACE leads to a large self-biased CME coefficient. The experimental results demonstrate that: 1) a large remnant CME coefficient of 0.02058 mG/V is achieved, which is ∼ 17 times higher than the previous results; 2) two stable magnetic flux states are generated by switching a smaller electric field of 10 V/cm ON/OFF alternately without magnetic bias field, which can be used as miniature electric-field-written high-density ME memory devices with lower energy consumption; and 3) the composite shows an approximately linear relationship between applied ac voltage Vin and induced magnetic induction B.
    No preview · Article · Nov 2015 · IEEE Transactions on Magnetics
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    ABSTRACT: This paper investigates a magnetoelectric(ME) vibration energy harvester that can scavenge energy in arbitrary directions in a plane as well as wide working bandwidth. In this harvester, a circular cross-section cantilever rod is adopted to extract the external vibration energy due to the capability of it's free end oscillating in arbitrary in-plane directions. and permanent magnets are fixed to the free end of the cantilever rod, causing it to experience a non-linear force as it moves with respect to stationary ME transducers and magnets. The magnetically coupled cantilever rod exhibits a nonlinear and two-mode motion, and responds to vibration over a much broader frequency range than a standard cantilever. The effects of the magnetic field distribution and the magnetic force on the harvester's voltage response are investigated with the aim to obtain the optimal vibration energy harvesting performances. A prototype harvester was fabricated and experimentally tested, and the experimental results verified that the harvester can extract energy from arbitrary in-plane directions, and had maximum bandwidth of 5.5 Hz, and output power of 0.13 mW at an acceleration of 0.6g (with g=9.8ms-2).
    No preview · Article · Oct 2015 · SMART STRUCTURES AND SYSTEMS
  • Ping Li · Yumei Wen · Ziqiang Zhang · Shiqiang Pan
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    ABSTRACT: This paper presents a high-efficiency management circuit using multi-winding up-conversion current transformer (CT) for power line energy harvesting. Due to sharing same loop for matching and charging in low working frequency (50Hz), the traditional matching circuit of the CT has a low Q value and low magnetoelectric(ME) efficiency, and cannot be used in both weak power-line current and heavy load. A multi-winding CT up-conversion matching circuit with a higher Q value is developed. Higher charging power (>175%), and larger ultimate charging voltage (>150%) in the weak power-line current (1A-100A) can be obtained by using the independent up-conversion resonant matching loop. The matching circuit can efficiently work at a wider load capacitance. In order to drive the wireless sensor with a higher consumption power, an instantaneous discharging circuit is developed suitable for weak energy harvesting (<700 μW). The instantaneous discharging circuit can accumulate weak energy from the CT transducer during a long period, and provide a higher power output in a very short time. The management circuit can drive wireless sensor with an output power of 60 mW at a distance of over 40 m. The multi-winding high-efficiency up-conversion management circuit can be used in many other low-frequency energy harvesters.
    No preview · Article · Oct 2015 · IEEE Transactions on Industrial Electronics
  • Chencheng Guo · Yumei Wen · Ping Li · Jing Wen
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    ABSTRACT: In water-supply pipeline leak detection and location, both the leak signals and blurred noises are closely related to the pipeline states and surroundings and most of the conventional noise-cancellation methods have to depend on the empirical parameters of either signals or noises. EMD (Empirical Mode Decomposition) is an adaptive signal decomposition method and is exclusive of base functions. A signal is decomposed into several IMFs (Intrinsic Mode Functions) in EMD, then the noise in a signal can be cancelled through removing uncorrelated IMFs. The existing EMD noise cancellation methods need to know the characteristics of either the wanted signal or the noise for rebuilding the noise-removed signal. However the characteristics of leak signals and noises are not fixed in various pipeline conditions, so the existing EMD noise cancellation methods can’t be directly applied in water-supply pipeline leak detection. This paper proposes an adaptive noise cancellation method based on EMD, in which the IMFs that don’t or less contain the components related to the leak can be removed through the cross-correlation between the IMFs and another signal collected at the either side of a suspect leak. In simulation analysis, the adaptive noise cancellation method can increase the SNRs (Signal to Noise Ratios) of leak signals as high as 16 dB. In processing practical pipeline vibro-acoustic signals, with the proposed method the peak of adaptive time delay estimate of leak signals, which determines the location of a leakage, becomes more distinguished, and thus the error of leakage location is improved.
    No preview · Article · Oct 2015
  • Lei Chen · Ping Li · Yumei Wen · Yong Zhu
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    ABSTRACT: Resonant magnetoelectric(ME) effect in FeNi–PZT–FeCuNiSiB trilayered composite with asymmetric magnetostrictive layers is investigated. The magnetic layers facilitate effective excitation of bending oscillations in the structure due to the flexural deformation caused by the asymmetric stress distribution in the FeNi–PZT–FeCuNiSiB composite. As a result, two remarkable resonance peaks appear at bending resonance frequency f1 = 38.8 kHz and longitudinal resonance frequency f2 = 163.2 kHz, respectively. The magnetic field frequency dependence of ME voltage coefficient of the FeNi–PZT–FeCuNiSiB trilayer is distinct from those of FeNi–PZT–FeNi and FeCuNiSiB–PZT–FeCuNiSiB trilayers. Furthermore, the dual-peak ME effects at bending and longitudinal resonance frequencies are observed. The ME voltage coefficient at bending resonance is 1.18 V/Oe (14.75 V/cm Oe) that is 1.68 times larger than the value measured for a FeNi–PZT bilayer of similar dimensions. These results provide the possibility of implementing FeNi–PZT–FeCuNiSiB trilayered composite in magnetic-sensing devices.
    No preview · Article · Oct 2015 · Journal of Alloys and Compounds
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    ABSTRACT: A low-magnetic-threshold acoustic switch (AS) fabricated using a magnetoelastic FeNi/brass phononic crystal (PC) plate is presented. Since the small differences in elastic characteristics between brass and FeNi lead to the strong elastic wave coupling, the changes in the elastic and geometrical characteristics of FeNi greatly affect band structures and corresponding wave transmissions. Consequently, the magnetic field threshold for turning on/off the presented AS is approximately 1/126 as large as that in the previous AS fabricated using a magnetoelastic Terfenol-D/epoxy PC. Moreover, this proposed AS exhibits an 89.9% contrast rate at 249.3 kHz.
    No preview · Article · Sep 2015 · Applied Physics Express
  • Lei Chen · Ping Li · Yumei Wen · Yong Zhu
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    ABSTRACT: Since the piezoelectric/magnetostrictive laminate composite exhibits a strong magnetoelectric (ME) effect, it provides a novel method for detecting ac magnetic field. There are a number of researches on the development of ME composites and their applications in detecting magnetic fields. Dong et al. demonstrates the possibility of fabricating ac magnetic field sensors with high performances[1]. Especially, ME composite sensor can achieve the passive sensing of magnetic field and possesses high sensitivity, which greatly enhances the competitiveness of ME composite sensor against traditional magnetic sensors. ME voltage coefficient varies with Hdc owing to the piezomagnetic coefficient's variation as a function of Hdc, which shows a peak behavior near an optimum dc bias magnetic field Hdc, opti. Hence, the ME composite sensor requires an external dc bias magnetic field to obtain the high ME sensitivity. However, the bias magnetic field is usually generated by using permanent magnets. It will increase the electromagnetic noise and increase the size of the sensor greatly, which is disadvantageous for the realization of high-sensitivity miniature magnetic sensors. Furthermore, the peak point is sharp and fixed, correspondingly small fluctuations of the optimum dc bias magnetic field will lead to a remarkable decrease of the ME voltage coefficient and degrade the ME composite performance significantly. In addressing these issues, the study of self-biased ME composite has provoked a great number of research activities and made progress [2-3]. However, these efforts have not obtained a wide range of dc bias response.
    No preview · Article · Jul 2015 · IEEE Transactions on Magnetics
  • Jun Zhang · Yumei Wen · Ping Li
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    ABSTRACT: Deployment of demand response electricity monitoring systems to manage electricity usage in residential areas is an effective way for energy saving [1]. Current sensor for household two-wire power cords is one of the key components in the system and must be designed with the characteristics of nonintrusive, easy-to-use and reliable. So far, piezoelectric MEMS [2] and inductive coil [3] nonintrusive current sensors have been proposed only for two-wire cables of zip-cord type. These sensors are designed to sense the magnetic field in the central line of the zip-cord, so they require complex alignment processes and can't detect current nonintrusively in two-wire cables of other types such as cylindered enclosure.
    No preview · Article · Jul 2015 · IEEE Transactions on Magnetics
  • Jing Qiu · Yumei Wen · Ping Li · Hengjia Chen
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    ABSTRACT: Vibration energy harvesting nowadays become more and more attractive to power intelligent sensors in Wireless Sensor Networks (WSNs). In this paper, a tunable ME and EM hybrid vibration-based generator (HVG) has been proposed. The electric output performances of the proposed ME/EM HVG have been investigated. Compared to traditional single MEVG or EMVG, the proposed ME/EM HVG obtains a remarkably enhanced output performance. The electric output characteristics involving voltage, current, power and resonance frequency of the HVG can be well tuned by controlling the number of turns N and the cantilever length L. When L and N is 5 cm and 750, the ME transducer provides high voltage of 118 V, the coil provides large current of 124.1 mA, respectively. The optimum output power of the HVG achieves 40.84 mW for an acceleration of 0.75 g at frequency of 25.7 Hz. Remarkably, the proposed ME/EM HVG has great potential for its application in WSNs.
    No preview · Article · Jul 2015 · IEEE Transactions on Magnetics
  • Xin Liu · Jing Qiu · Hengjia Chen · Xiaoyu Xu · Yumei Wen · Ping Li
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    ABSTRACT: In this paper, an electromagnetic vibration energy harvester (EVEH) with dual Halbach arrays is presented based on the Faraday’s law of electromagnetic induction. A Halbach array is a specific arrangement of permanent magnets which could concentrate the magnetic field on one side while reduce the field to almost zero on the opposite side. This array could increase the magnetic field intensity and improve the electromagnetic coupling. The experimental results show that the output performance of the presented harvester is optimal when the height of the coil equals to the sum thickness of two adjacent magnets in the array. An optimal output power density is 1.39 mW/cm3 at a resonant frequency of 11.20 Hz with an acceleration of 0.5 g (with g=9.8 m/s2) across a 20 mm-high and 1600-turn coil. When other conditions keep constant, the output power density is proportional to the length of the cantilever. The EVEH based on dual Halbach arrays can increase the output power density and minimize the overall volume, which is beneficial for improving the practical application.
    No preview · Article · Jul 2015 · IEEE Transactions on Magnetics
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    ABSTRACT: Resonant magnetoelectric (ME) effect in winglike ME composites of Fe-based nanocrystalline FeCuNbSiB alloy and piezoelectric ceramic Pb(Zr,Ti)O3 (PZT-5) with middle bonding are investigated. With the configuration of middle bonding, the influence of interfacial epoxy layer decreases and the winglike ME structure demonstrates a ~2 times higher ME voltage coefficient by a mechanical magnetic force coupled mode instead of shear force mode in the traditional layered composite. Moreover, the propose structure is easier to manufacture and has more stability with less epoxy adhesive. The winglike ME composite of FeCuNbSiB and PZT-5 achieves a ME voltage coefficient of 31.1 V/cm Oe when the length and thickness of FeCuNbSiB layer are 30 mm and 90 μm, respectively. These results provide the possibility of winglike ME composite for highly sensitive magnetic field sensing.
    No preview · Article · Jul 2015 · IEEE Transactions on Magnetics
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    ABSTRACT: A magnetic-field energy harvester using a low-frequency magneto-mechano-electric (MME) composite tuning-fork is proposed. This MME composite tuning-fork consists of a copper tuning fork with piezoelectric Pb(Zr1−x Ti x )O3 (PZT) plates bonded near its fixed end and with NdFeB magnets attached at its free ends. Due to the resonance coupling between fork prongs, the MME composite tuning-fork owns strong vibration and high Q value. Experimental results show that the proposed magnetic-field energy harvester using the MME composite tuning-fork exhibits approximately 4 times larger maximum output voltage and 7.2 times higher maximum power than the conventional magnetic-field energy harvester using the MME composite cantilever.
    No preview · Article · Jun 2015 · The Review of scientific instruments
  • Jing Qiu · Hengjia Chen · Yumei Wen · Ping Li
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    ABSTRACT: In this paper, a magnetoelectric (ME) and electromagnetic (EM) composite vibration energy harvester (VEH) employing a coil and a five-phase laminate ME transducer to convert low-frequency vibration energy into electrical energy are presented. The electric output performance of the proposed VEH has been investigated. Compared to a traditional single ME VEH or single EM VEH, the proposed ME/EM composite VEH can simultaneously obtain high voltage, large current, high power, and wide bandwidth. When the length of cantilever is 5 cm, the five-phase laminate composite ME transducer provides high voltage of 52 V and the coil provides large current of 97.8 mA. The optimum output power of the VEH achieves 16.47 mW for an acceleration of 0.5 g at a frequency of 27.5 Hz. Remarkably, the proposed ME/EM composite VEHs have great potential for its application in wireless sensor network.
    No preview · Article · May 2015 · Journal of Applied Physics