Article
Thermodynamics
Donglin Zou, Gaoyu Liu, Zhushi Rao, Junyi Cao, Wei-Hsin Liao
Summary: This study proposes a solution to the trade-off problem between equilibrium point coordinates and potential energy differences in the widely used Duffing-type bi-stable energy harvesters. By using programmable nonlinear force technologies, a novel piecewise bi-stable energy harvester (P-BEH) is designed, which shows significant improvements in peak power and bandwidth compared to the traditional energy harvester.
Article
Engineering, Multidisciplinary
Li Hai-Tao, Dong Bo-Jian, Cao Fan, Qin Wei-Yang, Tian Rui-Lan
Summary: This paper studies the homoclinic bifurcation and nonlinear characteristics of a bistable piezoelectric energy harvester under galloping and base excitation simultaneously. The electromechanical model of the energy harvester is established, and the threshold for snap-through is derived using the Melnikov method. The study provides a guideline for the optimum design of the bi-stable piezoelectric energy harvester for wind and vibration in practice.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Mechanical
Xi Wang, Qianzheng Du, Yang Zhang, Fei Li, Tao Wang, Guoqiang Fu, Caijiang Lu
Summary: This paper proposes a nonlinear bi-stable energy harvester with a bulking beam to realize its bi-stable characteristics. The characteristics of the piezoelectric energy harvester are tested under different conditions, revealing different principles at low and high frequencies. The axial load on the harvester is found to greatly influence its vibration amplitude, transitioning from inter-well vibration to intra-well vibration when the axial load changes from 0.4 N to 1.5 N.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Chemistry, Physical
Zhiyong Zhou, Haiwei Zhang, Weiyang Qin, Pei Zhu, Wenfeng Du
Summary: This study proposes a strategy to improve the electrical energy output of a piezoelectric energy harvester installed on a bridge by introducing bi-stable characteristics. A bi-stable harvester is designed and the experiment results show that it outperforms the classical linear harvester over the whole range of vehicle speed.
Article
Engineering, Mechanical
Zhaokun Wang, Fuwang Zhao, Yu Fu, Fang Deng, Lingwei Zeng, Jingyu Cui
Summary: Recently, there has been significant attention on energy harvesting through snap-through, a periodic snapping process. In this study, the snapping dynamics of a clamped buckled sheet in a Poiseuille channel flow were numerically investigated. The analysis revealed that the sheet can be in either a static equilibrium or snap-through oscillation state, with the oscillation state more easily initiated by buckling the sheet to a length ratio of approximately Delta L* = 0.3 and/or raising the Reynolds number. Results also showed that increasing the length ratio and bending stiffness enhanced the total energy harvesting in a post-equilibrium state, primarily by raising the elastic potential energy. The most effective portion for energy collection was found to be in the aft half of the sheet. Furthermore, transitions from an equilibrium state to a snap-through oscillation state increased both the elastic potential and kinetic energies. These findings provide insights into the dynamics of a pre-compressed elastic sheet and its interaction with a laminar channel flow, potentially guiding the optimization of energy harvesting systems.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Electrical & Electronic
Junjie Xu, Yonggang Leng, Fei Sun, Xukun Su, Xiaoyu Chen
Summary: A novel tri-magnet levitation bi-stable electromagnetic energy harvester is proposed, using a single-sided bipolar ring magnet to realize the bi-stable nonlinear mechanism. The potential energy variation is investigated to balance the asymmetric potential wells caused by the self-weight of the levitating magnet. Experimental results show that the device has a tunable operating bandwidth and a wider bandwidth requires sacrificing output power.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Thermodynamics
Wu Nan, He Yuncheng, Fu Jiyang
Summary: This paper presents a novel bistable piezoelectric energy harvester that collects kinetic energy from ambient vibrations for powering microelectronics sustainably. Experimental results show that the harvester performs well under different conditions.
Article
Materials Science, Composites
Xiaohui Liu, Hexuan Jia, Ming Li, Yanqi Li, Yan Tao, Fuhong Dai
Summary: In this study, a bistable piezoelectric wind energy harvester (BPEH) made of bistable hybrid symmetric laminate (BHSL) and PZT was proposed and manufactured through a curing process. An air-solid-electric coupled finite element analysis model was established to simulate the dynamic response behavior of the BPEH and investigate the effects of varying airflow velocities on the flow field characteristics and performance output. Experimental studies on BPEH were conducted in the wind speed range of 8.5 m/s-16.5 m/s. The results showed that the BPEH had an optimum external load of 60 k & omega; and achieved a maximum power output of 7.21 mW and a maximum amplitude of 93.065 mm at a wind speed of 14.5 m/s. The proposed simple structure of the harvester may open a new way for bistable composite structures to acquire wind energy widely in natural environments.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Chunlai Yang, Yikai Yuan, Hai Wang, Ye Tang, Jingsong Gui
Summary: In this study, a vibration energy harvester based on a two-dimensional acoustic black hole (ABH) was proposed, which utilizes the wave energy focus effect of ABH to increase harvested power. The structure of ABH was designed and analyzed using numerical simulation, and optimal parameters such as power index, truncation thickness, cross-sectional length, and round table diameter were obtained. The quadratic velocity of the plate surface with ABH was determined to be 22.33 times higher than that of a flat plate, and PZT film was attached to the corresponding positions of the ABH structure and plate structure. Under the same excitation-vibration condition, the average output power of a PZT with an ABH structure was found to be higher than that of a flat plate.
Article
Thermodynamics
Haiwei Zhang, Weiyang Qin, Zhiyong Zhou, Pei Zhu, Wenfeng Du
Summary: This study proposes a novel harvester that utilizes bridge vibration energy to power wireless sensors. The harvester employs bi-stable characteristics and magnetic interaction to enhance energy harvesting efficiency. Experimental results demonstrate its excellent performance in vibration energy harvesting and protection against damage.
Article
Engineering, Mechanical
Xiaoyu Ma, Kangqi Fan, Xuan Zhang, Shizhong Zhao, Hua He, Chao Zhang, Kai Tao
Summary: This paper introduces an ingenious vibration-rotation mechanism that converts ambient low-frequency vibrations into fast rotation. The rotor-based vibration energy harvester designed with this mechanism can generate high voltage and large power, making it suitable for various irregular low-frequency vibrations.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Donglin Zou, Keyu Chen, Zhushi Rao, Junyi Cao, Wei-Hsin Liao
Summary: This study develops a novel quad-stable energy harvester (QEH) with user-defined equilibrium point coordinates. By programming these coordinates, high-performance QEHs can be developed and personalized for different vibration environments. The designed QEH shows high average output power, normalized power density, and operating frequency range.
NONLINEAR DYNAMICS
(2022)
Article
Green & Sustainable Science & Technology
Wenzheng Cai, Vesselina Roussinova, Vesselin Stoilov
Summary: This study proposes, designs, and tests a new concept of a small-scale piezoelectric wave energy harvester based on the acceleration-driven principle. Six piezoelectric generators placed in the enclosure are used as energy conversion devices, providing high-frequency response and the ability to withstand large strain. The device can operate at deployment sites with consistent medium/small wave energy flux and naturally float on the water surface. It is lightweight, cost-effective, and suitable for operation in remote rivers and lakes due to its self-generating capability.
Article
Mechanics
Diankun Pan, Zhangming Wu, Fuhong Dai
Summary: This paper focuses on studying the snap-through behavior of a family of bi-stable plates constructed by hybrid symmetric laminates with a cantilever boundary. The results show that lay-up design and length are important parameters that affect the characteristics of this bi-stable laminate, and also reveal the nonlinear structural behavior of the structure.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Li Hai-Tao, Ding Hu, Jing Xing-Jian, Qin Wei-Yang, Chen Li-Qun
Summary: The study proposes a TEH with a staircase-shaped potential well, which can execute snap-through at low frequencies and expand the bandwidth, generating high output voltages under weak excitation. The effectiveness of this design is demonstrated through theoretical analysis and experiments, showing potential for improved energy harvesting efficiency from ambient vibration.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Zhiyong Zhou, Weiyang Qin, Wenfeng Du, Pei Zhu, Qi Liu
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Review
Chemistry, Multidisciplinary
Honglei Zhou, Weiyang Qin, Qingmin Yu, Huanyu Cheng, Xudong Yu, Huaping Wu
Article
Physics, Applied
Zhiyong Zhou, Weiyang Qin, Pei Zhu, Wenfeng Du, Wangzheng Deng, Jianan Pan
APPLIED PHYSICS LETTERS
(2019)
Article
Nanoscience & Nanotechnology
Jianan Pan, Weiyang Qin, Wangzheng Deng
Article
Thermodynamics
Weiyang Qin, Wangzheng Deng, Jianan Pan, Zhiyong Zhou, Wenfeng Du, Pei Zhu
Article
Physics, Multidisciplinary
Li Haitao, Weiyang Qin
EUROPEAN PHYSICAL JOURNAL PLUS
(2019)
Article
Engineering, Mechanical
Honglei Zhou, Weiyang Qin, Qingmin Yu, Xudong Yu, Huanyu Cheng, Huaping Wu
EXTREME MECHANICS LETTERS
(2020)
Article
Chemistry, Physical
Yuansheng Wang, Zhiyong Zhou, Qi Liu, Weiyang Qin, Pei Zhu
Article
Instruments & Instrumentation
Chunbo Lan, Guobiao Hu, Yabin Liao, Weiyang Qin
Summary: Utilizing wind energy to assist a nonlinear vibration energy harvester in achieving high-energy orbit oscillation is an effective strategy, compared to traditional methods which may reduce energy harvesting efficiency. The proposed orbit-jump method is based on wind-induced negative damping mechanism and self-excited behavior, and its feasibility has been validated through numerical simulation and experiments, showing good stability in different excitation frequencies and acceleration levels.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Physics, Applied
Jianan Pan, Weiyang Qin, Yongfeng Yang, Yaowen Yang
Summary: This study introduces a hybrid energy harvester design to broaden the working bandwidth of vibration energy harvesting by utilizing coupling and collision effects between two piezoelectric polyline beams. The results demonstrate that the proposed harvester, consisting of two polyline beams, achieves a broader bandwidth and can generate an output power of 69.1 mu W under specific excitation conditions. Parameter analysis and theoretical studies further support the effectiveness of the design in extending the working bandwidth.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Thermodynamics
Jianan Pan, Weiyang Qin, Wangzheng Deng, Pengtian Zhang, Zhiyong Zhou
Summary: A rigid-elastic energy harvester composed of an inverted piezoelectric beam and a pendulum (IPBP) was proposed to harvest more energy from weak vibration. Experimental results are in good agreement with simulation predictions, showing mode coupling in the IPBP under weak excitation, which triggers snap-through motion and generates large electrical output. This study may offer a new method to enhance the harvesting performance of weak excitation.
Article
Engineering, Mechanical
Chunbo Lan, Zhenning Chen, Guobiao Hu, Yabin Liao, Weiyang Qin
Summary: This paper investigates a frequency-self-tracking (FST) energy harvester with passive self-adaptation capability, which uses a piezoelectric transducer to achieve efficient energy harvesting by matching the excitation frequency. The proposed FST-VEH demonstrates significantly enhanced energy harvesting performance and over 800% increase in output voltage amplitude due to its passive self-adaptation capability.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Chemistry, Physical
Zhiyong Zhou, Haiwei Zhang, Weiyang Qin, Pei Zhu, Wenfeng Du
Summary: This study proposes a strategy to improve the electrical energy output of a piezoelectric energy harvester installed on a bridge by introducing bi-stable characteristics. A bi-stable harvester is designed and the experiment results show that it outperforms the classical linear harvester over the whole range of vehicle speed.
Article
Biophysics
Honglei Zhou, Yue Zhang, Ye Qiu, Huaping Wu, Weiyang Qin, Yabin Liao, Qingmin Yu, Huanyu Cheng
BIOSENSORS & BIOELECTRONICS
(2020)
Article
Acoustics
Yebao Xia, Xingmin Ren, Weiyang Qin, Yongfeng Yang, Kuan Lu, Chao Fu
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2020)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
