Yumei Wen

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

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Publications (146)197.58 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: In this research, a vibration energy harvester employing the FeCuNbSiB/Terfenol-D/PZT/Terfenol-D/FeCuNbSiB five-phase laminate composite transducer to convert mechanical vibration energy into electrical energy was presented. The electric output performance of the proposed vibration energy harvester has been investigated. It was found that appropriate FeCuNbSiB layer thickness was propitious to the electric output characteristics. Compared to traditional vibration energy harvester using Terfenol-D/PZT/Terfenol-D (MPM) transducer, the experimental results show that the proposed vibration energy harvester provides a remarkably enhanced output power performance. When the thickness of FeCuNbSiB layer was 30 μm, the optimum output power of vibration energy harvester achieved 4.00 mW/g for an acceleration of 0.8 g at frequency of 34.5 Hz, which was 1.29 times as great as that of traditional MPM transducer. Remarkably, this power is a very encouraging power figure and the proposed vibration energy harvester has great potential as far as its application in wireless sensor network.
    Journal of Applied Physics 05/2015; 117(17):17E705. DOI:10.1063/1.4914957 · 2.19 Impact Factor
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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.
    Journal of Applied Physics 05/2015; 117(17):17A331. DOI:10.1063/1.4918688 · 2.19 Impact Factor
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    ABSTRACT: Vibration energy harvesting is now receiving more interest as a means for powering intelligent wireless sensor systems. In this paper, a resonant electromagnetic vibration energy harvester (VEH) employing double cantilever to convert low-frequency vibration energy into electrical energy is presented. The VEH is made up of two cantilever beams, a coil, and magnetic circuits. The electric output performances of the proposed electromagnetic VEH have been investigated. With the enhancement of turns number N, the optimum peak power of electromagnetic VEH increases sharply and the resonance frequency deceases gradually. When the vibration acceleration is 0.5 g, we obtain the optimum output voltage and power of 9.04 V and 50.8 mW at frequency of 14.9 Hz, respectively. In a word, the prototype device was successfully developed and the experimental results exhibit a great enhancement in the output power and bandwidth compared with other traditional electromagnetic VEHs. Remarkably, the proposed resonant electromagnetic VEH have great potential for applying in intelligent wireless sensor systems.
    Journal of Applied Physics 05/2015; 117(17):17B509. DOI:10.1063/1.4907700 · 2.19 Impact Factor
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    ABSTRACT: A high-Q cross-plate phononic crystal resonator (Cr-PCR) coupled with an electromechanical Helmholtz resonator (EMHR) is proposed to improve acoustic wave localization and energy harvesting. Owing to the strongly directional wave-scattering effect of the cross-plate corners, strong confinement of acoustic waves emerges. Consequently, the proposed Cr-PCR structure exhibits ~353.5 times higher Q value and ~6.1 times greater maximum pressure amplification than the phononic crystal resonator (Cy-PCR) (consisting of cylindrical scatterers) of the same size. Furthermore, the harvester using the proposed Cr-PCR and the EMHR has ~22 times greater maximum output-power volume density than the previous harvester using Cy-PCR and EMHR structures.
    Applied Physics Express 05/2015; 8(5):057101. DOI:10.7567/APEX.8.057101 · 2.57 Impact Factor
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    ABSTRACT: The Fe73.5Cu1Nb3Si13.5B9/PZT thick film composites with excellent magnetoelectric (ME) coupling effect were synthesized by electrostatic spray depositing. The ME coupling characteristics of Fe73.5Cu1Nb3Si13.5B9/PZT thick film composites were investigated. It is found that the appropriate thickness ratio between magnetostrictive layers and piezoelectric layers (tm/tp) will be favorable to raise the resonance ME field output performance. The resonance frequency of ME field coefficient can be tuned by controlling tm/tp. The optimum resonance ME field coefficient of Fe73.5Cu1Nb3Si13.5B9/PZT thick film composites achieves 259.2 V/cm Oe at mechanical resonance frequency at 11.5 kHz with the dc bias magnetic field is 60 Oe. Remarkably, the proposed composites exhibit a giant ME effect and a higher ME voltage coefficient than the previous Terfenol-D/PZT laminated composites. It indicates that the mentioned Fe73.5Cu1Nb3Si13.5B9/PZT thick film composites have great potential for the application of highly sensitive magnetic field sensing and vibration energy harvesting.
    Journal of Applied Physics 04/2015; 117(17). DOI:10.1063/1.4906170 · 2.19 Impact Factor
  • AIP Advances 04/2015; 5(4):047144. DOI:10.1063/1.4919401 · 1.59 Impact Factor
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    ABSTRACT: This paper develops a magnetoelectric (ME) heterostructure FeCuNbSiB/Ni/Rosen-type piezoelectric transformer (RPT)/Ni/FeCuNbSiB consisting of a RPT Pb(Zr1-xTix)O3 with its drive-end sandwiched between two graded-magnetostrictive layers of FeCuNbSiB/Ni. The graded-magnetostrictive layer FeCuNbSiB/Ni is made up of Fe-based nanocrystalline alloy FeCuNbSiB (Fe73.5Cu1Nb3Si13.5B9) and pure Nickel (Ni). Due to the different magnetic characteristics of FeCuNbSiB and Ni (such as permeability, saturation magnetization and magnetostriction), the FeCuNbSiB/Ni layer exhibits an internal magnetic bias field, which results in the large self-biased ME properties. An amplified output voltage can be obtained between the two electrodes of the generator-end due to the step-up voltage-gain effect of the RPT. Consequently, the maximum zero-biased ME voltage coefficients of generator-end are ~4.06 V/Oe at the first resonance frequency of ~41 kHz, and ~4.22 V/Oe at the second resonance frequency of ~102 kHz. The results show that this heterostructure is of interest for high-sensitive magnetic field sensors.
    IEEE Sensors Journal 01/2015; 15(1):402-407. DOI:10.1109/JSEN.2014.2342278 · 1.85 Impact Factor
  • IEEE Transactions on Magnetics 01/2015; DOI:10.1109/TMAG.2015.2435013 · 1.21 Impact Factor
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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.
    IEEE Transactions on Magnetics 01/2015; DOI:10.1109/TMAG.2015.2432065 · 1.21 Impact Factor
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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.
    IEEE Transactions on Magnetics 01/2015; DOI:10.1109/TMAG.2015.2437892 · 1.21 Impact Factor
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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.
    IEEE Transactions on Magnetics 01/2015; DOI:10.1109/TMAG.2015.2435010 · 1.21 Impact Factor
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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.
    IEEE Transactions on Magnetics 01/2015; DOI:10.1109/TMAG.2015.2438116 · 1.21 Impact Factor
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    ABSTRACT: Cantilever beams have found intensive and extensive uses as underlying mechanisms for energy transduction in sensors as well as in energy harvesters. In magnetoelectric (ME) transduction, the underlying cantilever beam usually will undergo magnetic coupling effect. As the beam itself is either banded with magnetic transducer or magnets, the dynamic motion of the cantilever can be modified due to the magnetic force between the magnets and ME sensors. In this study, the dynamic response of a typical spiral cantilever beam with magnetic coupling is investigated. The spiral cantilever acts as the resonator of an energy harvester with a tip mass in the form of magnets, and a ME transducer is positioned in the air gap and interacts with the magnets. It is expected that this spiral configuration is capable of performing multiple vibration modes over a small frequency range and the response frequencies can be magnetically tunable. The experimental results show that the magnetic coupling between the magnets and the transducer plays a favorable role in achieving tunable resonant frequencies and reducing the frequency spacings. This will benefits the expansion of the response band of a device and is especially useful in energy harvesting.
    International Journal of Structural Stability and Dynamics 12/2014; 14(08):1440021. DOI:10.1142/S0219455414400215 · 1.06 Impact Factor
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    ABSTRACT: Giant self-biased converse magnetoelectric (CME) effects with obvious hysteretic behaviors are systematically investigated in two-phase SmFe2/PZT [Pb(Zr1− x , Ti x )O3] multiferroic laminates at room temperature. Taking advantage of the huge anisotropic field of SmFe2 plate, large remnant CME coupling is provoked by this field instead of permanent magnets to bias the laminate. Consequently, bitable magnetization status switching is realized through a smaller ac voltage far below the electric coercive field in the absence of magnetic bias field. Experiments demonstrate that a large remnant CME coefficient (αCME) of 0.007 mG/V is achieved, exhibiting ∼50 times higher CME coefficient than the previous laminate composite multi-phase magnetostrictive plates. These results provide promising applications for realization of high-density magnetoelectric random access memories (MERAMs) devices with lower energy consumption.
    Applied Physics Letters 10/2014; 105(17):172408. DOI:10.1063/1.4900929 · 3.52 Impact Factor
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    ABSTRACT: To scavenge energy from ambient vibrations with arbitrary in-plane motion directions and over a wide frequency range, a novel electromagnetic vibration energy harvester is designed and optimized. In the harvester, a circular cross-section elastic rod, not a traditional thin cantilever beam, is used to extract ambient vibration energy because of its capability to collect vibration from arbitrary in-plane motion directions. The magnetic interaction between magnets and the iron core contributes to a nonlinear oscillation of the rod with increased frequency bandwidth. The influences of the structure configurations on the electrical output and the working bandwidth of the harvester are investigated using Ansoft's Maxwell 3D to achieve optimal performance. The experimental results show that the harvester is sensitive to vibrations from arbitrary in-plane directions and it exhibits a bandwidth of 5.7 Hz and a maximum power of 13.4 mW at an acceleration of 0.6 g (with g = 9.8 ms−2).
    Journal of Applied Physics 09/2014; 116(11):114506-114506-6. DOI:10.1063/1.4895994 · 2.19 Impact Factor
  • Lei Chen, Ping Li, Yumei Wen, Yong Zhu
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    ABSTRACT: We investigate magnetoelectric (ME) effects in various three-phase laminate composites of FeCuNbSiB/Terfenol-D/PZT(FeMP), FeCuNbSiB/iron–nickel-based ferromagnetic alloy with constant elasticity/PZT(FeFP) and FeCuNbSiB/Ni/PZT(FeNiP). Under the low frequency and resonant frequency condition, various composites exhibit hysteretic ME responses as a function of applied bias field. Both self-biased effect characterized by non-zero ME effect at zero bias and dual-peak ME effect are observed. Especially, self-biased ME properties are remarkably enhanced at resonance. The zero-biased ME coefficient for FeNiP with a high quality factor of 551.79 reaches 10.12 V/Oe (126.625 V/(cm Oe)), which is 4.34 times and 19.84 times larger than those of FeFP (2.33 V/Oe) and FeMP (0.51 V/Oe) composites, respectively. These results provide the possibility of implementing self-biased ME effect in high-sensitivity magnetic-sensing devices.
    Journal of Alloys and Compounds 09/2014; 606:15–20. DOI:10.1016/j.jallcom.2014.04.003 · 2.73 Impact Factor
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    ABSTRACT: A packaged current sensor consisting of a SmFe2/PZT/SmFe2 self-biased magnetoelectric (ME) laminate and a Fe73.5Cu1Nb3Si13.5B9 nanocrystalline flux concentrator for weak-current detection at the power-line frequency is fabricated and characterized. The giant magnetostrictive material of the SmFe2 plate with its large anisotropic constant provides a huge internal anisotropic field to bias the ME transducer in a closed magnetic loop. Consequently, the additional magnetomotive force induced by the internal field and the corresponding increased effective permeability contribute to an improvement in sensitivity. Experimental results demonstrate that the presented sensor has a higher sensitivity of 152 mV A−1 at 50 Hz with a slight nonlinearity of ~0.01% FS and matches well with the predicted value. This current-sensing device exhibits approximately 2.3 times higher sensitivity than does conventional ME composite with PZT and Terfenol-D plates serving as the key sensitive component. In addition, the packaged sensor is evaluated for a long period of 72 h to determine stability over time, and the results are analyzed by means of a mathematical statistics method; favorable stability with an uncertainty of 0.5 μV is obtained in continuous 1 h testing. These results represent a significant advancement in the development of promising applications of tri-layer self-biased ME laminate for monitoring power-line electric cords.
    Smart Materials and Structures 08/2014; 23(9):095028. DOI:10.1088/0964-1726/23/9/095028 · 2.45 Impact Factor
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    ABSTRACT: The correlation-based location methods are widely used in leak detection of the pipelines assuming that the acoustic speed has been known and constant. In practice, the acoustic speed is frequency-varying due to the dispersions of gas-leak-induced acoustic waves, and thus the assumption is not supported. In this work, a location scheme based on cross-time–frequency spectrum (CTFS) is intended for the gas-leak-induced acoustic waves with frequency-varying acoustic speed. In the scheme, the CTFS is obtained by the one-dimensional Fourier transform of the time domain convolution between the kernel function in correlation domain and the instantaneous cross-correlation of the two spatially separately collected acoustic signals on either sides of a leakage. Then, the time difference of arrival (TDOA) and the corresponding frequency information are extracted simultaneously when the CTFS reaches the maximum value. The resulting peak frequency is used to online determine the frequency-dependant acoustic speed in combination with the known dispersive curve of gas-leak-induced dominated mode. Finally, the gas leakage is located by the TDOA and the frequency-dependant acoustic speed of real-time determination instead of constant acoustic speed. Consequently, for the proposed scheme, the constant acoustic speed is no longer a prerequisite. The proposed scheme has been experimentally validated in leak detection of gas pipelines and results demonstrate that the average relative location errors are reduced by six times compared with the commonly used correlation-based location method.
    Journal of Sound and Vibration 08/2014; 333(17):3889–3903. DOI:10.1016/j.jsv.2014.04.018 · 1.86 Impact Factor
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    ABSTRACT: This paper presents an energy harvester using a Terfenol-D/PMNT/Terfenol-D magnetoelectric (ME) transducer for scavenging ac magnetic field energy from two-wire power cords connected to household and commercial appliances. The harvester uses a magnetic circuit consisting of six NdFeB magnets mounted on the free end of a cantilever beam. The magnets produce concentrated flux gradient on the ME transducer, and the vertical Ampere forces acting on the two conductors of the power cord are superimposed. An enhanced movement is then induced on the magnetic circuit. The ME transducer undergoes magnetic field variations and generates power output. A prototype is fabricated and tested. Because of the high magnetomechanical coupling effect of the magnetostrictive material and the large flux gradient on the ME transducer, the harvester can generate a maximum power of 671.2 mu W with a matching load resistance of 991 k Omega at 6 A. The results demonstrate the potential of the proposed device applied to electricity end-use environment in electric power systems.
    IEEE Transactions on Magnetics 08/2014; 50(8):1-5. DOI:10.1109/TMAG.2014.2314443 · 1.21 Impact Factor
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    ABSTRACT: We report on a shear-mode off-antiresonance and antiresonance magnetoelectric (ME) responses in Tb0.3Dy0.7Fe1.92/Pb(Zr, Ti)O3/SmFe2 laminate multiferroic heterostructures for magnetic detecting and energy scavenging without bias field. A negative shear force as well as large internal anisotropic field is provided by SmFe2 plate due to its ferromagnetic and magnetostrictive properties, while the Terfenol-D plate provides a positive shear force to invoke a higher shear-stress transfer. Consequently, stronger ME coupling with a value of 2.24 V/Oe is obtained to be generated from the proposed architecture in the absence of the applied dc magnetic field. Experimental results exhibit an approximately linear sensitivity curve under off-antiresonance and antiresonance conditions, and the minimum stepped variations of input ac magnetic field as small as 2.43 × 10−8T can be clearly distinguished under 111.5 kHz. In addition, a maximum power of 0.323 μW with a 2.6MΩ load resistance in series connected to the ME laminate under the conditions of no bias can be achieved. These properties demonstrate that such a miniature multimode ME device is capable of weak magnetic field detecting and spatial magnetic energy scavenging by removing the requirement of dc bias field.
    Sensors and Actuators A Physical 08/2014; 214. DOI:10.1016/j.sna.2014.04.037 · 1.94 Impact Factor

Publication Stats

490 Citations
197.58 Total Impact Points


  • 1998–2015
    • Chongqing University
      • • School of Opto-Electronic Engineering
      • • Key Laboratory of Optoelectronic Technology and System of the Education Ministry of China
      Ch’ung-ch’ing-shih, Chongqing Shi, China
  • 2011
    • Institute of Forensic Science under the Ministry of Justice P.R. China
      Shanghai, Shanghai Shi, China