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国家自然科学基金(51205302)

作品数:6 被引量:36H指数:3
相关作者:王卫东樊康旗易成龙余波王连松更多>>
相关机构:西安电子科技大学福州大学香港城市大学更多>>
发文基金:国家自然科学基金陕西省自然科学基金中央高校基本科研业务费专项资金更多>>
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6 条 记 录,以下是 1-6
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Broadband energy harvesting via magnetic coupling between two movable magnets被引量:7
2014年
Harvesting energy from ambient mechanical vibrations by the piezoelectric effect has been proposed for powering microelectromechanical systems and replacing batteries that have a finite life span. A conventional piezoelectric energy harvester (PEH) is usually designed as a linear resonator, and suffers from a narrow operating bandwidth. To achieve broadband energy harvesting, in this paper we introduce a concept and describe the realization of a novel nonlinear PEH. The proposed PEH consists of a primary piezoelectric cantilever beam coupled to an auxiliary piezoelectric cantilever beam through two movable magnets. For predicting the nonlinear response from the proposed PEH, lumped parameter models are established for the two beams. Both simulation and experiment reveal that for the primary beam, the introduction of magnetic coupling can expand the operating bandwidth as well as improve the output voltage. For the auxiliary beam, the magnitude of the output voltage is slightly reduced, but additional output is observed at off-resonance frequencies. Therefore, broadband energy harvesting can be obtained from both the primary beam and the auxiliary beam.
樊康旗徐春辉王卫东方阳
Molecular dynamics study on temperature and strain rate dependences of mechanical tensile properties of ultrathin nickel nanowires被引量:3
2013年
Based on the EAM potential, a molecular dynamics study on the tensile properties of ultrathin nickel nanowires in the (100〉 orientation with diameters of 3.94, 4.95 and 5.99 nm was presented at different temperatures and strain rates. The temperature and strain rate dependences of tensile properties were investigated. The simulation results show that the elastic modulus and the yield strength are gradually decreasing with the increase of temperature, while with the increase of the strain rate, the stress--strain curves fluctuate more intensely and the ultrathin nickel nanowires rupture at one smaller and smaller strain. At an ideal temperature of 0.01 K, the yield strength of the nanowires drops rapidly with the increase of strain rate, and at other temperatures the strain rate has a little influence on the elastic modulus and the yield strength. Finally, the effects of size on the tensile properties of ultrathin nickel nanowires were briefly discussed.
王卫东易成龙樊康旗
Complete Charging for Piezoelectric Energy Harvesting System被引量:2
2014年
Under an in-phase assumption, the complete charging for an energy harvesting system is studied, which consists of a piezoelectric energy harvester(PEH), a bridge rectifier, a filter capacitor, a switch, a controller and a rechargeable battery. For the transient charging, the results indicate that the voltage across the filter capacitor increases as the charging proceeds, which is consistent with that reported in the literature. However, a new finding shows that the charging rate and energy harvesting efficiency decrease over time after their respective peak values are acquired.For the steady-state charging, the results reveal that the energy harvesting efficiency can be adjusted by altering the critical charging voltage that controls the transition of the system. The optimal energy harvesting efficiency is limited by the optimal efficiency of the transient charging. Finally, the relationship between the critical charging voltage and the equivalent resistance of the controller and rechargeable battery is established explicitly.
樊康旗徐春辉王卫东
关键词:ENERGYHARVESTINGPIEZOELECTRICENERGYHARVESTERCHARGINGENERGY
从人体行走中收集能量的鞋上压电俘能器被引量:15
2017年
设计了一种安装在鞋上的压电俘能器(PEH),用于收集人体行走时产生的能量。该俘能器由4根压电悬臂梁和1个弹簧-质量系统组成。弹簧-质量系统能够感知沿径骨轴的加速度激励,并通过磁耦合驱动压电梁振动从而发电。文中通过拟合实验数据获得加速度信号表达式;然后,建立仿真模型,对俘能器的发电性能进行了仿真分析。最后,加工了实验样机,并实验测试了俘能器的发电性能。结果表明,当受到沿胫骨方向的激励时,压电梁在一个步态周期内可被弹簧-质量系统激励多次从而产生多个峰值电压;受到沿胫骨和脚面两个方向激励时,压电梁的发电性能比只受到单一方向激励时好。当步行速度为2~8km/h时,每根压电梁的峰值电压可达到10V。该俘能器能够从人体行走的超低频运动中收集能量,并能够同时收集两个方向的加速度能量,提高了压电梁的发电性能。
樊康旗刘朝辉王连松余波
关键词:压电效应人体步态升频
单层二硫化钼纳米带弛豫性能的分子动力学研究被引量:3
2016年
采用分子动力学方法,基于REBO势函数研究了不同长宽比的单层二硫化钼纳米带在不同热力学温度(0.01—1600 K)条件下的弛豫性能.对弛豫过程中纳米带的能量变化和表面起伏程度进行了分析对比,研究了单层二硫化钼纳米带自由弛豫的动态平衡过程.仿真结果显示:理想温度(0.01 K)条件下,分子动能较低,振动振幅较小,并不足以使纳米带产生起伏现象;但在室温或高温条件下时,纳米带的边缘及内部均会出现一定程度的起伏;随着体系温度的升高以及纳米带长宽比的增加,起伏程度也会增大.最后,讨论了不同热力学温度条件下,手性对纳米带驰豫性能的影响.研究结果表明,不同于扶手椅型纳米带,锯齿型纳米带不仅会出现垂直于纳米带表面的起伏和弯曲,同时还会在纳米带面内出现明显的沿着宽度方向的弯曲现象.
王卫东李龙龙杨晨光李明林
关键词:手性
不同温度条件下单层石墨烯纳米带弛豫性能的分子动力学研究被引量:6
2012年
分别采用Tersoff-Brenner势和AIREBO势,对三种长宽比的单层石墨烯纳米带在不同热力学温度(0.01—4000 K)下的弛豫性能进行了分子动力学模拟.对基于两种势函数模拟的石墨烯纳米带弛豫的能量曲线和表面形貌进行了分析对比,研究了石墨烯纳米带在弛豫过程中的动态平衡过程.模拟结果表明:单层石墨烯纳米带并非完美的平面结构,边缘处和内部都会呈现一定程度的起伏和皱褶,这与已有的实验结果相符合;石墨烯纳米带的表面起伏程度随长宽比的减小而减小,并且在不同温度条件下,系统动能对石墨烯纳米带的弛豫变形的影响很大,即系统温度越高,石墨烯纳米带的弛豫变形幅度愈大;高长宽比纳米带在一定温度条件下甚至会出现卷曲现象.最后,对采用Tersoff-Brenner势和AIREBO势进行石墨烯的分子动力学模拟进行了深入分析.
王卫东郝跃纪翔易成龙牛翔宇
关键词:石墨烯纳米带分子动力学模拟
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