Yumei Wen

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

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Publications (136)178.77 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: 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
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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
  • 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: 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
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    ABSTRACT: Tuning band structures of a magneto-mechanical phononic crystal (PnC) (containing elastic plates bonded with magnets) is demonstrated by applying a small static magnetic field (Hdc). Due to magnetic torque effect, the markedly altered coupling between Bragg scattering (related to lattice constants) and local resonances of plates occurs. Consequently, significant tuning of band structures is observed under a greatly small Hdc. Experiments show that an additional passband occurs in band structures when Hdc ≥ 130 Oe. This threshold (130 Oe) is ∼1/100 as large as that of the conventional PnC using magnetostrictive materials. The adjusted maximum of passband bandwidth is 0.57 kHz under 0–600 Oe.
    Applied Physics Letters 07/2014; 105(1):011904-011904-4. DOI:10.1063/1.4887378 · 3.52 Impact Factor
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    ABSTRACT: A magnetoelectric (ME) vibration energy harvester has been designed to scavenge sufficient energy from ambient vibration with arbitrary motion directions in a plane and over a range of frequencies. In the harvester, a circular-cross-section cantilever rod is adopted to extract the vibration energy due to its ability to host accelerations in arbitrary in-plane motion directions. The magnetic coupling between the magnet and the ME transducer results in nonlinear oscillation of the cantilever rod with increased frequency bandwidth. To achieve optimal vibration energy harvesting performance, the effects of the nonlinear vibration and the harvester parameters including the magnetic circuit and the separation distance on the electrical output and the␣working bandwidth are analyzed. The experimental results show that the harvester can scavenge vibration energy in arbitrary in-plane directions, exhibiting a bandwidth of 4.0 Hz and maximum power of 0.22 mW at acceleration of 0.6g (with g = 9.8 m s−2).
    Journal of Electronic Materials 07/2014; 43(7). DOI:10.1007/s11664-014-3056-y · 1.68 Impact Factor
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    ABSTRACT: This paper proposes a high-efficiency small-size upconversion management circuit for low-frequency vibrating energy harvesting. Due to low vibrating frequency (32 Hz), the transformer of a traditional matching circuit has a large inductance (9171 H) and a large size $(> 50 times 50 times 50 hbox{mm}^{3})$. An upconversion matching circuit with a smaller inductance (25.3 H) and a smaller size $(< 20 times 20 times 20 hbox{mm}^{3})$ is developed. By using the smaller size upconversion matching circuit, higher charging power and ultimate charging voltage can be obtained at a higher frequency (3.28 kHz). The matching circuit can efficiently work at a wide vibrating frequency range. In order to drive the wireless sensor with a higher consumption power (110 mW), an instantaneous discharging circuit is developed that is suitable for weak vibrating energy harvesting (406 $ muhbox{W}$). The instantaneous discharging circuit can accumulate weak energy from the vibrating transducer during a long period, and it can provide a higher power output in a very short time. While the voltage across the storing capacitor is over 0.36 V, the instantaneous discharge circuit can drive a wireless sensor with an output power of 110 mW at a distance of over 80 m. The small-size high-efficiency upconversion management circuit can be used in many other low-frequency energy harvesters.
    IEEE Transactions on Industrial Electronics 07/2014; 61(7):3349-3358. DOI:10.1109/TIE.2013.2278954 · 6.50 Impact Factor
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    ABSTRACT: A high-efficiency broadband acoustic energy harvester consisting of a compliant-top-plate Helmholtz resonator (HR) and dual piezoelectric cantilever beams is proposed. Due to the high mechanical quality factor of beams and the strong multimode coupling of HR cavity, top plate and beams, the high efficiency in a broad bandwidth is obtained. Experiment exhibits that the proposed harvester at 170–206 Hz has 28–188 times higher efficiency than the conventional harvester using a HR with a piezoelectric composite diaphragm. For input acoustic pressure of 2.0 Pa, the proposed harvester exhibits 0.137–1.43 mW output power corresponding to 0.035–0.36 μW cm−3 volume power density at 170–206 Hz.
    Review of Scientific Instruments 06/2014; 85(6):066103-066103-3. DOI:10.1063/1.4882316 · 1.58 Impact Factor
  • Lei Chen, Ping Li, Yumei Wen, Yong Zhu
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    ABSTRACT: This paper presents a comparison of the resonant magnetoelectric (ME) voltage coefficients for multilayered PZT/FeNi-FACE composites with Fe-based nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy (FeCuNbSiB) and without FeCuNbSiB. As the magnetic interaction between FeNi-FACE and FeCuNbSiB produces an internal magnetic field (Hint), it leads to the variation of the total dc magnetic bias and the ME voltage coefficient for multilayered PZT/FeNi-FACE composites with FeCuNbSiB, relative to multilayered PZT/FeNi-FACE composites without FeCuNbSiB. Correspondingly, a high ME voltage coefficient for multilayered PZT/FeNi-FACE composites with FeCuNbSiB at zero can be obtained. Furthermore, as the number of layer increases to 9, the zero-bias ME voltage coefficient first increases, and then decreases. The value of seven-layer composite reaches 5.14 V/Oe, which is about 2.35 times higher than that for three-layer, 1.53 times higher than that for five-layer, and 1.22 times higher than that for nine-layer. Such high performances enable the ME composites to possess an ideal sensing and make them promising for self-bias ME sensor application.
    Journal of Alloys and Compounds 05/2014; 595:87–91. DOI:10.1016/j.jallcom.2014.01.163 · 2.73 Impact Factor
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    ABSTRACT: To develop high performance microwave noise suppressor, the microwave noise suppressors based on a microstrip line using FeCoB based magnetic thin film are presented, whose microwave noise suppression effects have been investigated. It was found that suitable low argon pressure is beneficial to the improvement of microwave noise suppression. In addition, the microwave noise suppression properties of microwave noise suppressor could be tuned by controlling the geometric dimension of FeCoB based magnetic thin film and SiO2 dielectric layer, resulted from the ferromagnetic resonance loss and eddy current loss. The maximum power loss ratio (Ploss/Pin) of thin-film microwave noise suppressor (the length, width, and thickness of FeCoNiB thin film are 25 mm, 10 mm, and 250 nm, respectively) achieves 0.75 at 3.4 GHz. These results show that the presented film noise suppressors have potential for the electromagnetic interference design in the GHz frequency range.
    Journal of Applied Physics 04/2014; 115(17). DOI:10.1063/1.4861579 · 2.19 Impact Factor
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    ABSTRACT: Low-frequency and resonance magnetoelectric (ME) responses without bias have been studied in a three-phase multilayer ME composite consisting of positive/negative giant magnetostrictive materials (GMMs) Terfenol-D (Tb0.3Dy0.7Fe1.92), Samfenol (SmFe2) plates, and piezoelectric single crystal 0.67PMN-0.33PT [0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3]. The large intrinsic anisotropic field with obvious hysteresis and remnant magnetization in SmFe2 plates as well as an exchanging field induced by the differences in magnetic properties of the two GMMs contributes to the self-biased ME responses. The experimental results demonstrate that the output sensitivities without bias for the resonance frequency at 97.5 kHz and the off-resonance frequency at 1 kHz can reach 1.1 V/Oe and 8.7 mV/Oe, respectively. A step change of ac magnetic field as small as ̃2.27 × 10-8 T can be clearly distinguished by the amplitude of the output signals under the resonance frequency of 97.5 kHz. These results provide potential applications for magnetic field detection without bias by utilizing a multilayer ME laminate due to its self-biased, self-powered, and ultra-sensitive properties.
    Journal of Applied Physics 04/2014; 115(17). DOI:10.1063/1.4865973 · 2.19 Impact Factor
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    ABSTRACT: A frequency-tunable current sensor consisting of Terfenol-D/PZT/Terfenol-D magnetoelectric (ME) laminate and Fe73.5Cu1Nb3Si13.5B9 nanocrystalline alloy has been developed. Almost all ME current-sensing devices have higher outputs at resonance conditions, but this advantage is useful only for narrow bandwidth. For the purpose of broadband current sensing, a frequency up-conversion mechanism is introduced by means of nonlinearity of the field-dependence magnetostriction λ(H). Current sensitivity enhancement is realized by modulating the low-frequency dynamic magnetostrictive strain to its resonance conditions. This solution provides the possibility to achieve resonance-enhanced sensitivity at the power-line frequency of 50 Hz, and the capability to immune the noise floor. Experimental results show that the modulated sensitivity is increased from 48.6 mV/A to 178.4 mV/A at 50 Hz, and a small current step change of 3 mA can be clearly distinguished by amplitude or phase of the output signals. These results provide possibilities to accurately detect weak currents in the noise ambient at low frequencies.
    Journal of Applied Physics 04/2014; 115(17). DOI:10.1063/1.4862081 · 2.19 Impact Factor

Publication Stats

458 Citations
178.77 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