Yumei Wen

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

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Publications (153)203.14 Total impact

  • [Show abstract] [Hide abstract]
    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.
    The Review of scientific instruments 06/2015; 86(6):066102. DOI:10.1063/1.4922854 · 1.58 Impact Factor
  • 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.
    Journal of Applied Physics 05/2015; 117(17):17A331. DOI:10.1063/1.4918688 · 2.19 Impact Factor
  • Jing Qiu · Yumei Wen · Ping Li · Xin Liu · Hengjia Chen · Jin Yang
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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
  • Jing Qiu · Yumei Wen · Ping Li · Hengjia Chen · Jin Yang
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    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: 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
  • Jing Qiu · Yumei Wen · Ping Li · Hengjia Chen
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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
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    ABSTRACT: An impacting-based piezoelectric energy harvester was developed to address the limitations of the existing approaches in single-dimensional operation as well as a narrow working bandwidth. In the harvester, a spiral cylindrical spring rather than the conventional thin cantilever beam was utilized to extract the external vibration with arbitrary directions, which has the capability to impact the surrounding piezoelectric beams to generate electricity. And the introduced vibro-impacting between the spiral cylindrical spring and multi-piezoelectric-beams resulted in not only a three-dimensional response to external vibration, but also a bandwidth-broadening behavior. The experimental results showed that each piezoelectric beam exhibited a maximum bandwidth of 8 Hz and power of 41 μW with acceleration of 1 g (with g=9.8 ms−2) along the z-axis, and corresponding average values of 5 Hz and 45 μW with acceleration of 0.6 g in the x-y plane.
    AIP Advances 04/2015; 5(4):047144. DOI:10.1063/1.4919401 · 1.59 Impact Factor
  • Lei Chen · Ping Li · Yumei Wen · Yong Zhu
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    ABSTRACT: A novel nonlinear theoretical model including eddy-current effect and demagnetization effect is presented for predicting magnetoelectric (ME) response in self-biased magnetostrictive/piezoelectric composites with the magnetization-graded ferromagnetic materials. The model is developed based on the nonlinear constitutive relationships of magnetostrictive material, motion equation for the composite plate, and ME equivalent circuit method. In this theoretical model, the equivalent magnetic charge theory is used for analyzing the influence of magnetostrictive material FeCuNbSiB on the effective magnetic field inside the Terfenol-D and the non-zero piezomagnetic coefficient at zero bias, in which the interface coupling parameter £ and the magnetic field dependence of mechanical quality factor are taken into consideration. The theoretical results indicate that the variation of ME voltage coefficients with applied dc magnetic field are in good agreement with the experimental results both under low and resonant frequency conditions. It confirms the validity and reliability of the obtained nonlinear theoretical model. Furthermore, self-biased effect and the difference between the low frequency and resonant ME voltage coefficient with Hdc are discussed in details. The theoretical model plays an important role in the comprehensive understandings of dynamic ME response properties for self-biased laminate composites and the designing and fabricating ME devices.
  • 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.
    IEEE Transactions on Magnetics 01/2015; DOI:10.1109/TMAG.2015.2432065 · 1.21 Impact Factor
  • 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.
    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
  • Caijiang Lu · Ping Li · Yumei Wen · Aichao Yang
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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
  • Xiaoling Bai · Yumei Wen · Ping Li · Jin Yang · Xiao Peng · Xihai Yue
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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: This paper presents an electric current sensor employing an unsymmetrical magnetoelectric composite Metglas/Pb(Zr,Ti)O3 (PZT) consisting of magnetostrictive Metglas and piezoelectric PZT. As the Metglas foils with excellent magnetic characteristics induce the magnetic field around a current-carrying cable, an output voltage is generated in Metglas/PZT. The influence of the numbers of Metglas foil (L) on resonance output voltage (Vo, r) is experimentally investigated in detail. The results demonstrate that the maximum Vo, r is 223 mV for Metglas/PZT with L = 4 under 190.2 Hz frequency and dc biased magnetic field Hdc = 16 Oe. By adding a 1.3 g tip mass at the free end of Metglas/PZT, the resonant frequency of Metglas/PZT with L = 4 can be adjusted to 50 Hz, where the Vo, r is 211 mV at Hdc = 16 Oe. With the excellent linearity and large current sensitivity (114.2 mV/A) when measuring low-frequency alternating magnetic fields of 50 Hz, this sensor is ideally suited for power-line current measurement.
    IEEE Transactions on Magnetics 11/2014; 50(11):1-4. DOI:10.1109/TMAG.2014.2326193 · 1.21 Impact Factor
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    ABSTRACT: A magnetoelectric (ME) composite consisting of FeCuNbSiB foils, Terfenol-D plates, piezoelectric PZT plates, and an H-shaped elastic substrate has been developed. The H-shaped elastic substrate severs as the multipeak frequency determining element. Due to the coupling between the H-shaped elastic substrate beams, an enhancement in the multipeak ME effect can be obtained compared with the conventional composite using a rectangle elastic substrate. The ME coefficient of the composite with two PZT plates electrically connected in series reaches 58.2 V/cm·Oe, which is ~4 times higher than that of the ME composite with the rectangle structure. The multipeak ME effects, along with the giant ME coupling, can be used in multifunctional devices, such as broadband energy harvesters or magnetic field sensors.
    IEEE Transactions on Magnetics 11/2014; 50(11):1-4. DOI:10.1109/TMAG.2014.2331083 · 1.21 Impact Factor
  • Wei He · Ping Li · Yumei Wen · Jitao Zhang · Aichao Yang · Caijiang Lu
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    ABSTRACT: A noncontact energy harvester employing a Terfenol-D/PZT/Terfenol-D magnetoelectric transducer for scavenging ac magnetic field energy from a power line is proposed. The harvester uses a Halbach array and a magnetic circuit mounted on the free end of a cantilever beam. The Halbach array produces augmented magnetic field on the side where the power line is placed, and the magnetic circuit generates concentrated flux gradient on the magnetoelectric transducer. When the power line is energized, the harvester experiences an enhanced magnetic force which induces a bending movement of the beam. Due to the enhanced exciting force and the large magnetic field the magnetoelectric transducer undergoes, the response of the harvester to the ac can be potentially strengthened. Experimental study has been conducted. The results show that, at the current of 5 A, the harvester can produce a power of 523 μW across an 896 kQ resistor under the resonant frequency of 50 Hz.
    IEEE Transactions on Magnetics 11/2014; 50(11):1-4. DOI:10.1109/TMAG.2014.2323082 · 1.21 Impact Factor
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    ABSTRACT: Large self-biased converse magnetoelectric effects (CME) are characterized in a multiferroic composite consisting of a magnetostrictive Terfenol-D (Tb0.3Dy0.7Fe1.92) plate, a piezoelectric single crystal 0.67PMN-0.33PT [0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3] plate and Fe-based amorphous alloy FeSiB foils. For the purpose of dynamic memory-type magnetization switching through electric-field control without bias, an internal magnetic field originating from a spatially varying magnetization in compositionally graded composite of FeSiB/Terfenol-D is obtained to bias the composite. Therefore, the presented composite exhibits hysteretic behaviors of CME responses as a function of magnetic bias field with a large remnant CME coefficient of ±0.038 mGs/V under Hbias =0. Without the magnetic bias, the induced magnetic induction B increases progressively with the applied ac voltage V, and the composite shows an approximately linear relationship between V and B. Furthermore, dynamic memory-type magnetization switching by a smaller applied electric field of 12.5 V/cm between two stable states is realized. Compared with its state-of-the-art counterparts, this compact device has a simpler synthesis process and smaller applied electric fields without bias, which can be used as miniature electric-field controlled magnetoelectric memory devices.
    IEEE Transactions on Magnetics 11/2014; 50(11):1-4. DOI:10.1109/TMAG.2014.2320578 · 1.21 Impact Factor
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    ABSTRACT: We develop a unique magnetoelectric (ME) heterostructure with giant 2-D ME effects by attaching magnetostrictive Metglas at the free end of a piezoelectric Pb(Zr1-xTix)O3 (PZT) cantilever, instead of interface bonding. The ME effects originate from flexural deformation of PZT plate driven by a mechanical force from Metglas. In experiments, the 1-D ME heterostructures induced different directional magnetic fields have been designed optimally. When the length of Metglas ribbon is 12 mm, the 1-D ME heterostructures have the maximum ME effects. After assembling the different optimal designed 1-D ME heterostructures, an ME heterostructure with 2-D ME characteristics is obtained. The 2-D heterostructure has two resonant frequencies, at about 88 and 115 kHz. The maximum resonant voltage coefficient (αME,r) is 79 (V/cm Oe) when the heterostructure is in one direction of the magnetic field, and 45 (V/cm Oe) when the heterostructure is in the other direction of the magnetic field. The results demonstrate that this ME structure can be used as a multidimensional ME transducer.
    IEEE Transactions on Magnetics 11/2014; 50(11):1-4. DOI:10.1109/TMAG.2014.2320997 · 1.21 Impact Factor

Publication Stats

526 Citations
203.14 Total Impact Points


  • 2005–2015
    • 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