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Unlocking multidirectional and broadband wind energy harvesting with triboelectric nanogenerator and vortex-induced vibration of sphere

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Applied Mathematics and Mechanics(English Edition) 2024年第11期45卷 1895-1912页

作者： Lanbin ZHANG Yixiang HE Bo MENG Huliang DAI Lin WANG Faculty of Engineering China University of GeosciencesWuhan430074China International Joint Research Center for Deep Earth Drilling and Resource Development Wuhan430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan430074China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenGuangdong Province518060China

A unique oscillating wind-driven triboelectric nanogenerator(OWTENG)based on the sphere's vortex-induced vibration(VIV)behavior is proposed in this study,which can harvest wind energy across a multitude of horizontal *** the Euler-Lagrange method,the coupled governing equations of the OWTENG are established and subsequently validated by experimental *** vibrational properties and output performance of the OWTENG for varying wind speeds are analyzed,demonstrating its effectiveness in capturing wind energy across a broad range of wind speeds(from 2.20 m/s to 8.84 m/s),and the OWTENG achieves its peak output power of 106.3μW at a wind speed of 5.72 m/***,the OWTENG maintains a steady output power across various wind directions within the speed range of 2.20 m/s to 7.63 m/***,when the wind speed exceeds 7.63 m/s,the vibrational characteristics of the sphere shift based on the wind direction,leading to fluctuations in the OWTENG's output *** research presents an innovative approach for designing vibrational triboelectric nanogenerators,offering valuable insights into harvesting wind energy from diverse directions and speeds.

关键词： wind energy harvesting triboelectric nanogenerator vortex-induced vibration(VIV) lock-in region

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OPTICAL MEMS ACCELEROMETER BASED ON PHOTONIC CRYSTAL WITH AIR DEFECT LAYER 18

OPTICAL MEMS ACCELEROMETER BASED ON PHOTONIC CRYSTAL WITH AI...

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18th Symposium on Piezoelectricity, Acoustic Waves, and Device Applications, SPAWDA 2024

作者： Hu, Jiahao Xu, Haoyu Hu, Ningdong Hu, Hongping Department of Mechanics School of Aerospace Engineering Huazhong University of Science and Technology Wuhan China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331523732

The accelerometer based on photonic crystals has been widely used in various fields in recent years owing to its characteristics of high sensitivity. A one-dimensional optical microelectromechanical systems (MEMS) accelerometer based on photonic crystal with air defect layer is proposed. The optical sensing system of this accelerometer consists of an asymmetric one-dimensional photonic crystal with an air defect layer. The optical sensing system is designed as an asymmetric structure. Linear tuning can be achieved over a large wavelength range within a limited range of defect layer thickness variations. Compared with existing research results, the accelerometer has higher sensitivity, linearity, and reliability. After calculation by finite element method, the functional characteristics of the accelerometer are as follows: an optical sensitivity of 10.6 nm/g, a mechanical sensitivity of 9.61 nm/g, and a linear measurement range of ±25 g. This accelerometer has high resonant frequency and bandwidth. The optimization scheme of the accelerometer provides guidance for the design of a new MEMS accelerometer, which can be applied to fields such as inertial navigation. © 2024 IEEE.

关键词： Accelerometers

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Utilization of nonlinear vibrations of soft pipe conveying fluid for driving underwater bio-inspired robot

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 1109-1124页

作者： Huliang DAI Yixiang HE Kun ZHOU Zerui PENG Lin WANG P.HAGEDORN Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074China Department of Mechanical Engineering Technische Universität at DarmstadtDarmstadt 64293Germany State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024Liaoning ProvinceChina

Creatures with longer bodies in nature like snakes and eels moving in water commonly generate a large swaying of their bodies or tails,with the purpose of producing significant frictions and collisions between body and fluid to provide the power of consecutive forward *** swaying can be idealized by considering oscillations of a soft beam immersed in water when waves of vibration travel down at a constant *** present study employs a kind of large deformations induced by nonlinear vibrations of a soft pipe conveying fluid to design an underwater bio-inspired snake robot that consists of a rigid head and a soft *** the head is fixed,experiments show that a second mode vibration of the tail in water occurs as the internal flow velocity is beyond a critical *** the corresponding theoretical model based on the absolute nodal coordinate formulation(ANCF)is established to describe nonlinear vibrations of the *** the head is free,the theoretical modeling is combined with the computational fluid dynamics(CFD)analysis to construct a fluid-structure interaction(FSI)simulation *** swimming speed and swaying shape of the snake robot are obtained through the FSI simulation *** are in good agreement with experimental *** importantly,it is demonstrated that the propulsion speed can be improved by 21%for the robot with vibrations of the tail compared with that without oscillations in the pure jet *** research provides a new thought to design driving devices by using nonlinear flow-induced vibrations.

关键词： soft pipe conveying fluid underwater bio-inspired robot flutter fluidstructure interaction(FSI) absolute nodal coordinate formulation(ANCF)

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Investigation on the Very High Cycle Fatigue Life of Titanium Alloys by Near-βForging and Shot Peening

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Acta Mechanica Solida Sinica 2024年第6期37卷 881-890页

作者： Qiangang Xu Yonghui Chen Kai Pan Xingwei Xu Fei Zhao Kai Guo Xiaotao Liu Zhen Zhang Department of Engineering Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan430074China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment 1037 Luoyu RoadWuhan430074China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China National Key Laboratory of Strength and Structural Integrity Aircraft Strength Research Institute of ChinaXi’an710065China Chinese Aeronautical Establishment Beijing100012China AECC Chengdu Engine Co. LtdChengdu610503China

In order to enhance the fatigue properties of metallic materials,a feasible rationale is to delay or prevent the interior and surface fatigue crack *** on this rationale,the study investigates the approach of improving the very high cycle fatigue properties of TC6 titanium alloys through near-βforging coupled with shot peening,conducted at 930℃and ambient temperature,*** unveil the associated mechanisms,microstructure,microhardness,residual stress,and fatigue properties are thoroughly analyzed after each *** indicate a considerable refinement in microstructure and significant mitigation of the initially existed strong texture post near-βforging and annealing,efficiently delaying crack initiation and *** a result,the very high cycle fatigue property of TC6 achieves remarkable enhancement after *** to near-βforging,shot peening might not necessarily improve the very high cycle fatigue performance,particularly beyond 10^(6)cycles.

关键词： Titanium alloy Near-βforging Shot peening Fatigue life Very high cycle fatigue

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A Thermo-mechanical Investigation on Laser Ablation of Aluminum Alloy

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Acta Mechanica Solida Sinica 2023年第5期36卷 658-671页

作者： Xuehai Qian Yongkang Luo Qingfeng Chai Yu Zhang Lv Zhao Department of Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074China National Key Laboratory of Strength and Structural Integrity Aircraft Strength Research Institute of ChinaXi’an 710065China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Hubei Key Laboratory of Engineering Structure Analysis and Safety Assessment 1037 Luoyu RoadWuhan 430074China

The interactions between laser and metal are extremely complicated,during which material is gradually removed due to melting or *** further leads to a continuously moving ablation front and a strong temperature gradient,ultimately producing through-thickness holes and residual stresses inside the *** present work establishes a simulation framework which couples the loading of laser beam and the moving ablation front by using the"birth-death"element *** framework allows to obtain accurate temperature field and ablated area,the latter being quite close to experimental results with 2024 aluminum ***,the Johnson-Cook constitutive model is employed to assess the residual stress and damage around the ablation holes,therefore enabling the evaluation of residual strength of ablated target.

关键词： Laser ablation Moving front Aluminum alloy Johnson–Cook model Residual stress

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金属细丝扭转中的尺寸效应与钝化效应

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Acta Mechanica Sinica 2023年第2期39卷 183-190页

作者：谢宇阳雷剑华奋飞胡建辉刘大彪何玉明 School of Aerospace Engineering Huazhong University of Science and Technology Wuhan 430074China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment Wuhan 430074China

本文对直径在25-50微米、有无钝化层的微尺度铜丝进行了扭转测试,开展了尺度效应与钝化效应的实验研究.通过磁控溅射制备了镀钛铜丝试样,在扭转测试中观察到直径减小和钝化层存在引起的屈服强度和流动应力的增加.与未钝化铜丝相比,钝化... 详细信息

本文对直径在25-50微米、有无钝化层的微尺度铜丝进行了扭转测试,开展了尺度效应与钝化效应的实验研究.通过磁控溅射制备了镀钛铜丝试样,在扭转测试中观察到直径减小和钝化层存在引起的屈服强度和流动应力的增加.与未钝化铜丝相比,钝化铜丝中存在更加明显的尺度效应,钝化铜丝的规范化扭矩随着直径减小而增加更为显著.基于Fleck-Hutchinson应变梯度塑性理论对铜丝的扭转响应进行了预测,数值结算结果与实验数据吻合较好,并阐明了钝化层对铜丝扭转变形影响的物理机制。

关键词： Torsion Copper wire Passivation effect Size effect Strain gradient plasticity

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Typical transient effects in a piezoelectric semiconductor nanofiber under a suddenly applied axial time-dependent force

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Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1095-1108页

作者： Wanli YANG Yuxing LIANG Department of Mechanics School of Aerospace EngineeringHubei Key Laboratory of Engineering Structural Analysis and Safety AssessmentHuazhong University of Science and TechnologyWuhan 430074China

Based on the mechanical motion equation,Gauss’s law,and the current continuity condition,we study a few typical transient effects in a piezoelectric semiconductor(PS)fiber to realize the startup and turning-off functions of common piezotronic *** this study,the transient extensional vibration induced by a suddenly applied axial time-dependent force is examined in a cantilevered n-type ZnO *** the magnitude of the loadings nor the doping concentration significantly affects the propagation caused by disturbance of the axial ***,both of the factors play an important role in the propagation caused by disturbance of the electron *** indicates that the electromechanical coupling effect can be expected to directly determine the electronic performance of the *** addition,the assumption of previous simplified models which neglect the charge carriers in Gauss’s law is discussed,showing that this assumption has a little influence on the startup state when the doping concentration is smaller than 1021 *** suggests that the screening effect of the carriers on the polarized electric field is much reduced in this situation,and that the state is gradually transforming into a pure piezoelectric ***,the carriers can provide a damping effect,which means that the previous simplified models do not sufficiently describe the turning-off *** numerical results show that the present study has referential value with respect to the design of newly multifunctional PS devices.

关键词： transient piezoelectric semiconductor(PS) extension vibration

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LOW FREQUENCY VIBRATION ISOLATION FOR HONEYCOMB SANDWICH PLATE BY LOCALLY RESONANCE 18

LOW FREQUENCY VIBRATION ISOLATION FOR HONEYCOMB SANDWICH PLA...

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18th Symposium on Piezoelectricity, Acoustic Waves, and Device Applications, SPAWDA 2024

作者： Zhu, Junlong Wang, Weiwei Xu, Haoyu Hu, Ningdong Guo, Yanming Gong, Zhaohan Gong Hu, Hongping School of Aerospace Engineering Huazhong University of Science and Technology Wuhan China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Huazhong University of Science and Technology Wuhan China Shanghai Institute of Satellite Engineering Shanghai201109 China

ISBN: (纸本)9798331523732

The control and suppression of low frequency vibration and noise has always been a difficult problem in mechanical engineering. In the field of phononic crystals, the transmission of low frequency sound waves can be effectively controlled by local resonance. A honeycomb sandwich panel structure is established for the low frequency vibration disturbance. The dispersion curves, modal shape and transmission performance of the structure are analyzed, respectively. The influence of structural parameters on the characteristics of the energy band are further investigated. The regulation law of the bandgap is mastered. Phononic crystals have excellent vibration isolation performance within the bandgap. By adjusting the structural parameters of the locally resonance oscillator, the frequency of bandgap of vibration isolation has been tuned effectively. Excellent effect of vibration isolation has been achieved. A low frequency with 16~22 Hz has been obtained and low vibration transmission coefficient are achieved in a low frequency. The increase of the oscillator mass will shift the bandgap to lower frequency. At the same time, the increase in the thickness of the element will cause the bandgap to move to higher frequency. © 2024 IEEE.

关键词： Honeycomb structures

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IMPACT RESPONSE OF SANDWICH STRUCTURE WITH BIDIRECTIONAL NEGATIVE POISSON'S RATIO 18

IMPACT RESPONSE OF SANDWICH STRUCTURE WITH BIDIRECTIONAL NEG...

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18th Symposium on Piezoelectricity, Acoustic Waves, and Device Applications, SPAWDA 2024

作者： Guo, Yanming Wang, Weiwei Zhu, Junlong Hu, Ningdong Xu, Haoyu Gong, Zhaohan Hu, Hongping School of Aerospace Engineering Huazhong University of Science and Technology Wuhan China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Huazhong University of Science and Technology Wuhan China Shanghai Institute of Satellite Engineering Shanghai201109 China

ISBN: (纸本)9798331523732

In contemporary military and civilian infrastructure fields, many structures are subjected to the impact of explosive shock waves. Explosion shock waves have unique properties, including an initial increase in magnitude, rapid attenuation, and short duration. Therefore it is imperative to investigate the transient dynamic responses of these structures when subjected to such shock waves. The sandwich structure is extensively utilized in industries such as aerospace and transportation. Currently, researchers are actively exploring a myriad of structural design strategies aimed at augmenting the resilience of sandwich structures against explosive impacts. In this paper, a bidirectional negative Poisson ratio sandwich structure is proposed, which can significantly reduce the propagation of explosion shock wave compared with the traditional honeycomb sandwich panel. The explosion impact performance of the bidirectional negative Poisson’s ratio sandwich structure under different structural parameters is studied through numerical calculations, which provides some reference for the design of satellite structures in aerospace engineering. © 2024 IEEE.

关键词： Sandwich structures

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Effects of mechanical loadings on the performance of a piezoelectric hetero-junction

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Applied Mathematics and Mechanics(English Edition) 2022年第5期43卷 615-626页

作者： Wanli YANG Renzhong HONG Yunbo WANG Yuantai HU Department of Mechanics School of Aerospace EngineeringHubei Key Laboratory of Engineering Structural Analysis and Safety AssessmentHuazhong University of Science and TechnologyWuhan 430074China Department of Microelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China

A fully-coupled model for a piezoelectric hetero-junction subjected to a pair of stresses is proposed by discarding the depletion layer *** effect of mechanical loadings on PN junction performance is discussed in *** examples are carried out for a p-Si/ZnO-n hetero-junction under a pair of stresses acting on the ntype ZnO portion near the PN interface,where ZnO has the piezoelectric property while Si is *** is found that the bottom of conduction band is lowered/raised near the two loading points due to the decrease/increase in the electron potential energy there induced by a tensile-stress mode via sucking in majority-carriers from two outside regions,which implies appearance of a potential barrier and a potential well near two loading ***,the barrier height and well depth gradually become large with increasing tensile stress such that more and more electrons/holes are inhaled in loading region from the n-/p-zone,***,rising/dropping of conduction band bottom is brought out near the two loading points by a compressive-stress mode due to the increase/decrease in the potential energy of electrons by pumping out the majority-carriers from the loading region to the two outside ***,a potential well and a potential barrier are induced near the two loading points,such that more and more electrons/holes are driven away from the loading region to the n-zone/p-zone,respectively,with the increasing compressive *** effects are important to tune the carrier recombination rate near the PN ***,the present study possesses great referential significance to piezotronic devices.

关键词： piezoelectricity hetero-junction polarized charge potential barrier tuning

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