Article
Instruments & Instrumentation
Junlei Wang, Shanghao Gu, Abdessattar Abdelkefi, Mingjie Zhang, Wanhai Xu, Yuyang Lai
Summary: The study evaluates the performance of a piezoelectric energy harvester with a square cylinder bluff body under different angles of attack. It suggests that the optimal angle of attack for energy harvesting is 10 degrees, with a 29.50% increase in output power compared to the traditional harvester at 0 degrees angle of attack.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Mechanics
Fevzi Cakmak Bolat, Sinan Basaran, Murat Kara
Summary: In this study, energy harvesting from cantilever composite beams at different lamination angles was experimentally investigated by bonding piezoelectric material to the surface of composite beams and exciting the structures using air-flow and an electromagnetic actuator. The energy harvest performances were analyzed under different external dynamics inputs, including harmonic inputs with different frequencies, and frequency-voltage responses were obtained. Vibration amplitudes and voltage outputs were also analyzed for both excitation types.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Marine
Xiang Xia, Haiyan Zeng, Zhengwei Wang, Lingjiu Zhou, Chengming Liu
Summary: This paper establishes a reliable two-dimensional fluid-structure interaction model using computational fluid dynamics and finite element method, and studies the steady flow fields and galloping characteristics of a faired riser under different inflow attack angles. The results show that the inflow attack angle has a significant influence on the riser oscillation, and there exists a critical attack angle where the oscillation is relatively weak.
Article
Thermodynamics
Mingrui Zheng, Dong Han, Tao Peng, Jincheng Wang, Sijie Gao, Weifeng He, Shirui Li, Tianhao Zhou
Summary: This paper proposes the concept of energy harvesting based on flow-induced vibration (FIV) for long-distance transport pipelines. By harvesting the fluid kinetic energy in pipelines and converting it into electricity, uninterrupted power is provided for sensors along pipelines, enabling remote monitoring and management at a lower cost. The paper aims to identify the shape features of flow-around structures that enhance FIV and improve energy harvesting efficiency, providing design references for energy harvester geometrical shapes. Numerical studies are conducted to investigate the influence of vortex shedding position on FIV performance, including FIV responses, wake patterns, and energy conversion efficiency. The results show that a more forward vortex shedding position leads to a higher FIV response, and the criterion for the shape feature on the upstream side of the structure that enhances FIV is summarized. The energy conversion efficiency is determined by FIV amplitude, oscillating frequency, and fluid force, and is not completely positively correlated with FIV amplitude. Each structure achieves maximum energy conversion efficiency at a frequency ratio of 0.7.
Article
Nanoscience & Nanotechnology
Peng Han, Qiaogao Huang, Guang Pan, Wei Wang, Tianqi Zhang, Denghui Qin
Summary: This study investigates the flow-induced vibration responses and energy harvesting characteristics of a low-mass square oscillator. Different vibration mechanisms are observed at various angles and reduced velocities. The 45-degree angle is identified as the most suitable arrangement for power conversion, and a damping ratio of 0.7 demonstrates the highest average efficiency among all tested cases.
Article
Materials Science, Textiles
Samane Azmi, Seyed-Mohammad Hosseini Varkiani, Masoud Latifi, Roohollah Bagherzadeh
Summary: This research presents an engineering approach to fabricate multilayered electrospun nanofiber mats with high conversion performance and improved physical stability. The effect of fiber alignments and layering angles on the piezoelectric responses of the mats was investigated. Results showed that increasing drum speeds improved the crystal structure and the formation of beta-phase. Samples with well-aligned nanofibers exhibited significantly improved electrical responses when exposed to periodic mechanical impact. Multilayered samples with different layering angles showed different improvements in their electrical output.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Mechanics
Zhensheng Li, Yudian Zhou, Liufang Xu
Summary: This study focuses on the special nonlinear effect of sinking bubbles in a container partially filled with liquid under vibration. The theoretical model is constructed from the perspectives of vibration mechanics and fluid mechanics, with detailed analysis on the bubble motion, added mass, and conditions affecting sinking. Through theoretical analysis, numerical simulations, and experimental validation, methods to prevent or weaken the effect of sinking bubbles in oscillating fluid are proposed.
Article
Engineering, Marine
Yaoran Chen, Limin Kuang, Jie Su, Dai Zhou, Yong Cao, Hao Chen, Zhaolong Han, Yongsheng Zhao, Shixiao Fu
Summary: This study investigates the effect of pitch angles on the aerodynamic performance of twin vertical axis wind turbines (VAWTs) under staggered arrangements. Computational fluid dynamics is used to simulate the changes in power coefficients of the twin rotors. The study finds that the pitch angle of one rotor can affect the performance of both itself and the other rotor. The largest difference in power performance is found to be 4.79% for the upstream rotor and 7.04% for the downstream one. The study also comprehensively analyzes the aerodynamic mechanism through comparisons of velocity, vorticity, and pressure fields. The findings provide suggestions for the design of twin-VAWT systems.
Article
Engineering, Mechanical
Yun-Peng Zhu, Z. Q. Lang
Summary: This study investigates the beneficial effects of nonlinear damping on energy harvesting and vibration isolation, and concludes that introducing nonlinear damping can improve energy harvester performance and reduce vibration, especially under general input conditions.
NONLINEAR DYNAMICS
(2022)
Article
Thermodynamics
Ashraf Mimi Elsaid, Mohammed Ammar, Ashraf Lashin, Ghazy M. R. Assassa
Summary: This research experimentally and numerically investigates the thermal-hydraulic performance of the shell and helically coiled tube heat exchanger (SHCTHE) with different cross-sections. The aim is to improve performance using single nanofluids of Al2O3/H2O, MgO/H2O, and TiO2/H2O. Factors such as inclination angle, diameter ratio, flow direction, cross-section shape, nanomaterials type, and concentration were considered. A 3D (RNG)/k-& epsilon; model in ANSYS-FLUENT 19 was used for modeling. The highest Nusselt number, around 62.5%, was obtained with a circular tube cross-section for the SHCTHE.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Marine
Xiaomin Li, Dianpeng Chen, Honglu Gu, Fengtao Bai
Summary: This paper proposes a 3D numerical model for analyzing VIV on CTRs, considering geometric nonlinearities and large deformations. The model predicts VIV response under various flow conditions and analyzes VIV characteristics under different flow angles, showing significant influence of flow incident angle on VIV.
Article
Construction & Building Technology
Deqian Zheng, Wenyong Ma, Xiaobin Zhang, Wei Chen, Junhao Wu
Summary: This study measured the aerodynamic forces on a fixed and elastically mounted square cylinder using wind pressure tests and investigated the coupling effects between aerodynamic forces and the motion of the oscillating cylinder. The results showed that flow states significantly influence the coupling effects of the oscillating cylinder.
WIND AND STRUCTURES
(2022)
Article
Optics
Ming Cai, Hongxia Liu, Shulong Wang, Yindi Wang, Dong Wang, Mengwei Su
Summary: This paper investigates the transmission characteristics of grating-gate GaN-based HEMTs under different incident angles in the mid-infrared region, revealing their angle-tunable transmission properties. The research suggests that this structure holds promise for designing mid-infrared angle selection filters, sensors, and other subwavelength devices in the future.
Article
Construction & Building Technology
Qu Pengfei, Zuqiang Liu, Jianyan Xue
Summary: This study investigated the influence of loading angles on the seismic performance of steel reinforced concrete (SRC) special-shaped columns through cyclic loading tests and finite element analysis (FEA). The results showed that the failure patterns of columns varied with different loading angles, and with increasing loading angles, the hysteretic curves became fuller and the bearing capacity and initial stiffness increased, while the energy dissipation capacity changed insignificantly. The ductility improved with larger steel area at the failure side for asymmetric sections and near the neutral axis for symmetric sections when the loading angle changed.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Tunde Isaiah Toluwaloju, Chung Ket Thein, Dunant Halim, Jian Yang
Summary: This study investigated the dynamic responses and performance of a two-degree-of-freedom electromagnetic vibration harvester connected in different modes. The results showed that the individual and series connections achieved the highest power output at optimum loads.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Acoustics
Meng Zhang, Guifeng Zhao, Lulu Wang, Jie Li
SHOCK AND VIBRATION
(2017)
Article
Energy & Fuels
Junlei Wang, Guifeng Zhao, Meng Zhang, Zhien Zhang
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2018)
Article
Engineering, Electrical & Electronic
Meng Zhang, Jiankun Xu, Guifeng Zhao, Guanyang Hao
IET GENERATION TRANSMISSION & DISTRIBUTION
(2018)
Article
Acoustics
Meng Zhang, Guifeng Zhao, Jie Li
SHOCK AND VIBRATION
(2018)
Article
Construction & Building Technology
Guifeng Zhao, Jiankun Xu, Yaoliang Li, Meng Zhang
ADVANCES IN CIVIL ENGINEERING
(2018)
Article
Construction & Building Technology
Meng Zhang, Ran Liu, Yaoliang Li, Guifeng Zhao
ADVANCES IN CIVIL ENGINEERING
(2018)
Article
Energy & Fuels
Junlei Wang, Guoping Li, Meng Zhang, Guifeng Zhao, Zunlong Jin, Kun Xu, Zhien Zhang
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2018)
Article
Acoustics
Junlei Wang, Linfeng Geng, Meng Zhang, Guifeng Zhao, Min Zhang, Zhien Zhang, Yaoliang Li
SHOCK AND VIBRATION
(2018)
Article
Materials Science, Multidisciplinary
Zhongfei Ye, Kai Pang, Yuanxiang Du, Guifeng Zhao, Shao Huang, Meng Zhang
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2020)
Article
Chemistry, Multidisciplinary
Meng Zhang, Ran Wei, Yuanxiang Du, Guifeng Zhao
Summary: Based on an actual ultra-high voltage substation, a finite element model was built and the dynamic responses of the HV bushing, arrester, and DLTL system were analyzed under different seismic intensities. The results demonstrate that the DLTL adversely affects the responses of the HV bushing and arrester.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Guifeng Zhao, Jingpu Li, Meng Zhang, Yunping Yi
Summary: This study analyzed the mechanical behaviors and fatigue life of lightning rod joints in a 500 kV high-voltage substation structure. The results showed that reinforced lightning rod joints have better bearing capacity and longer fatigue life. The proposed research method is feasible.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Guifeng Zhao, Meng Zhang, Yaoliang Li, Dawang Li
JOURNAL OF ENGINEERING
(2016)
