Article
Chemistry, Physical
Francisco Javier Diaz Sanchez, Michael Chung, Muhammad Waqas, Vasileios Koutsos, Stewart Smith, Norbert Radacsi
Summary: This paper reports a one-step method for fabricating novel three-dimensional sponge-like piezoelectric electrospun nanofiber structures. By adding polyethylene oxide and lithium chloride to polyvinylidene fluoride and polyvinylidene fluoride-co-trifluoroethylene solutions, 700 micrometer thick sponge-like fiber mats were created and used as active cores for piezoelectric generators. The resulting generators showed higher peak-to-peak voltage and instantaneous output power.
Article
Engineering, Multidisciplinary
Tao Yang, YongQi Zhang, ShengXi Zhou
Summary: This article investigates the geometric nonlinearity and electromechanical coupling of multistage oscillators for ultra-low frequency vibration isolation and energy harvesting (VTEH). By introducing nonlinearity and mechanical multistage coupling, the problem of ultra-low frequency is solved and efficient vibration isolation and energy harvesting are achieved.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Review
Chemistry, Analytical
Mahidur R. Sarker, Mohamad Hanif Md Saad, Amna Riaz, M. S. Hossain Lipu, Jose Luis Olazagoitia
Summary: This study provides a detailed historical overview and analysis of micro-energy storage systems (MESS) as a form of ambient energy harvesting (EH). By selecting the top-cited articles, it reveals the significance of MESS integrated with renewable energy sources (RESs) in EH applications and offers suggestions for future developments.
Article
Engineering, Mechanical
Donglin Zou, Gaoyu Liu, Zhushi Rao, Ting Tan, Wenming Zhang, Wei-Hsin Liao
Summary: Nonlinear forces obtained via springs, magnets, buckling beams, etc., have been introduced into vibration energy harvesting, vibration isolation, and nonlinear energy sink to enhance performance. The development of a device capable of customizing nonlinear forces allows for improved dynamic system performance and successful applications in energy harvesting and vibration isolation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Acoustics
Ze-Qi Lu, Long Zhao, Hu Ding, Li-Qun Chen
Summary: This paper proposes a dual-functional metamaterial for integrated low-frequency vibration isolation and energy harvesting, achieved by implanting a rolling-ball with coils into a spherical magnetic cavity. Numerical results demonstrate that a cavity mass arrayed beam with a periodic array of nonlinear energy harvesters has more and wider low-frequency band-gaps compared to traditional metamaterials.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Electrical & Electronic
Lei Xu, Zhihai Xiang
Summary: By using a compact W-shaped compliant mechanism with direct quasi-zero stiffness, energy can be efficiently extracted from low-frequency vibration environments, and the device can also be used as a low-frequency vibration isolator.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Multidisciplinary
Chaoran Liu, Rui Zhao, Kaiping Yu, Heow Pueh Lee, Baopeng Liao
Summary: A novel energy harvesting device is proposed in this paper, based on vibration localization to reduce the force transmitted to the base, achieving simultaneous energy harvesting and vibration isolation. The device consists of a quasi-zero stiffness support and piezoelectric cantilever beams, allowing for flexible enhancement of energy harvesting performance by adjusting key parameters.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Computer Science, Hardware & Architecture
Hanieh Malekijou, Vesal Hakami, Nastooh Taheri Javan, Amirhossein Malekijoo
Summary: In this study, we investigate the transmission of delay/jitter-sensitive data over a wireless fading channel using an energy-harvesting IoT device. Our goal is to optimize the transmission control policies through Q-learning algorithms to minimize average delay/jitter, considering the limited harvested energy. Extensive numerical results are provided for performance evaluation.
JOURNAL OF SUPERCOMPUTING
(2023)
Review
Thermodynamics
Mohammed Y. Y. Jabbar, Saba Y. Y. Ahmed
Summary: Extensive studies have been conducted on powder metallurgy technology for manufacturing thermoelectric generator couples and improving their power efficiency by altering the internal and external structures of the heat exchangers and coolers. The review also addresses the impact of cooling techniques and metal materials on the output power. The conclusions provide valuable insights for designing heat exchangers and coolers, including the need to minimize pressure drop and optimize fuel consumption.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Multidisciplinary Sciences
Ercan M. Dede, Chi Zhang, Qianying Wu, Neda Seyedhassantehrani, Muhammad Shattique, Souvik Roy, James W. Palko, Sreekant Narumanchi, Bidzina Kekelia, Sougata Hazra, Kenneth E. Goodsonn, Roman Giglio, Mehdi Asheghi
Summary: An estimated 70% of the electricity in the United States currently passes through power conversion electronics, and this percentage is projected to increase eventually to up to 100%. At a global scale, wide adoption of highly efficient power electronics technologies is anticipated to have a major impact on worldwide energy consumption.
Article
Chemistry, Physical
YunHe Xu, Bo Wu, Yang Guo, Chengyi Hou, Yaogang Li, Hongzhi Wang, Qinghong Zhang
Summary: A stretchable thermoelectric device with liquid metal electrodes is proposed in this study, which can achieve a temperature reduction of 7.8K (+/- 0.2) and generate a voltage of 26.2mV when worn. By integrating nickel-doped EGaIn liquid metal electrodes and a flexible silicone matrix, the stretchable thermoelectric device can maintain excellent cooling even when stretched to strains above 30%, showing promising prospects for wearable coolers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Engineering, Aerospace
Xiaolei Jiao, Jinxiu Zhang, Wenbo Li, Youyi Wang, Wenlai Ma, Yang Zhao
Summary: The micro-vibration generated by disturbance sources on spacecraft has a significant impact on observation and imaging accuracy. Measures should be taken to isolate this micro-vibration, such as installing vibration isolation devices at the disturbance sources or payloads. We have summarized the development status of various types of micro-vibration isolation technologies and discussed their advantages, disadvantages, and application scope. Future development directions and challenges are proposed, aiming to provide a useful reference for researchers and engineers in the field of spacecraft micro-vibration isolation technology.
PROGRESS IN AEROSPACE SCIENCES
(2023)
Article
Physics, Applied
Guang Cheng, Yue Lu, T. A. Venkatesh
Summary: This study investigates the influence of geometry, specifically size and shape, on the indentation response of piezoelectric micro- and nanostructures. The findings suggest that thin films tend to exhibit a stiffer indentation response and generate more charges compared to nanoislands and nanowires. Additionally, the indentation of piezoelectric nanowire structures with a spherical indenter introduces a combination of deformation modes, resulting in a maximum charge generation on nanowire structures with a specific aspect ratio.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2022)
Review
Chemistry, Analytical
Qian Lian, Peiqing Han, Niansong Mei
Summary: This paper provides an overview of energy harvesting technology, describing methods for extracting energy from various sources and summarizing the characteristics of different energy sources and applicable circuit structures. It discusses the pros and cons of the circuits and future directions, highlighting the importance of MPPT as a method for improving system efficiency.
Article
Engineering, Mechanical
Tao Yang, Qingjie Cao, Zhifeng Hao
Summary: This study introduces the theory and method of vibration isolation and energy harvesting based on the high-order quasi-zero stiffness (HQZS) mechanism. Research results indicate that the HQZS oscillator shows better performance for ultra-low stochastic excitation intensity or harmonic excitation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Aerospace
Yeon-Hyeok Park, Mun-Shin Jo, Eung-Shik Lee, Hyun-Ung Oh
INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING
(2020)
Article
Instruments & Instrumentation
Junjiro Onoda, Kenji Minesugi, Seong-Cheol Kwon, Hyun-Ung Oh
Summary: A novel method (SHI-H-3) is proposed and demonstrated to enhance vibration harvesting by improving synchronized switch harvesting on inductor, allowing energy collection even from low-amplitude vibrations. The new switching strategy and circuit topology significantly improve energy collection efficiency and suitably harvest energy from low-amplitude vibrations.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Aerospace
Kyung-Rae Koo, Hyun-Guk Kim, Dong-Geon Kim, Seong-Cheol Kwon, Hyun-Ung Oh
Summary: A laminated patch based on CFRP was developed to improve the structural stability of an S-STEP satellite. The vibration reduction performance of the patch was verified through sine and random vibration tests. The results demonstrate that the CFRP-based laminated patch is an efficient solution.
Article
Engineering, Aerospace
Hyun-Guk Kim, Seong-Cheol Kwon, Kyung-Rae Koo, Sung-Chan Song, Youngjoon Yu, Youngbum Song, Yeon-Hyeok Park, Hyun-Ung Oh
Summary: This study utilized a shape memory alloy-based vibration isolator to reduce vibration transmission to satellites in a launch environment, confirming its effectiveness through experimental validation, potentially leading to cost savings in satellite development.
Article
Engineering, Aerospace
Hye-In Kim, Bong-Geon Chae, Pil-Gyeong Choi, Mun-Shin Jo, Kyoung-Muk Lee, Hyun-Ung Oh
Summary: This study proposes a thermal design for an on-board blackbody for spaceborne infrared sensor calibration. The design includes a heater to heat the blackbody during calibration and heat pipes to transfer residual heat to the radiator. The design features a temperature gradient on the blackbody surface of less than 1 K, ease of temperature sensor implementation, a stable thermal interface between the heat pipes and blackbody, and a fail-safe function under one heat pipe failure.
Article
Engineering, Aerospace
Seok Kim, Chan-Mi Song, Seung-Hun Lee, Sung-Chan Song, Hyun-Ung Oh
Summary: The S-STEP project aims to develop an innovative high-resolution SAR microsatellite and improve the development efficiency and system quality through the improvement of payload system design.
Article
Engineering, Aerospace
Soo-Jin Kang, Sung-Woo Park, Hye-Yoon Choi, Gu-Hyun Ryu, Jong-Pil Kim, Sung-Hoon Jung, Se-Young Kim, Hyon-Ik Lee, Hyun-Ung Oh
Summary: This paper presents the effectiveness of the thermo-mechanical design of a high-speed digital receiver unit developed for spaceborne applications. The design focuses on thermal management and passive thermal control methods, with the effectiveness validated through testing.
Article
Engineering, Aerospace
Yeon-Hyeok Park, Mun-Shin Jo, Hun-Young Kim, Dai-Ho Ko, Hyun-Ung Oh
Summary: The study proposed a novel design strategy based on mass balancing to ensure mechanical safety on the driving part of the tilting mirror mechanism, even without considering the implementation of the holding and release mechanism. The effectiveness of the proposed design was verified through launch vibration and life cycle tests.
Article
Engineering, Aerospace
Tae-Yong Park, Bong-Geon Chae, Hongrae Kim, Kyung-Rae Koo, Sung-Chan Song, Hyun-Ung Oh
Summary: The main objective of the S-STEP mission is to develop an 80-kg-class active X-band SAR observation small satellite, with a focus on a new thermal design strategy. This strategy aims to minimize heater power consumption, provide long-term SAR imaging duration, and utilize lightweight flexible graphite sheet as a thermal interface for high-power instruments.
Article
Engineering, Aerospace
Tae-Yong Park, Seok-Jin Shin, Hyun-Ung Oh
Summary: This study proposes a new version of a high-damping PCB design with multilayered viscoelastic tapes interlaminated on a thin metal stiffener spaced from a PCB. It aims to increase the fatigue life of solder joints of electronic packages and efficiently utilize the PCB area for mounting electronic parts.
Article
Engineering, Aerospace
Yeon-Hyeok Park, Seong-Cheol Kwon, Kyung-Rae Koo, Hyun-Ung Oh
Summary: A three-axis passive launch-vibration isolation system based on superelastic shape memory alloy technology was developed to attenuate dynamic launch loads transmitted to a small satellite. The system demonstrates superior damping characteristics and its effectiveness was validated through static load tests and launch environment simulating vibration tests.
Article
Engineering, Aerospace
Shankar Bhattarai, Ji-Seong Go, Hyun-Ung Oh
Summary: This study introduces the Diverse Holding and Release Mechanism Can Satellite (DHRM CanSat) platform developed by the Space Technology Synthesis Laboratory (STSL) at Chosun University in South Korea to demonstrate the design effectiveness and functionality of three newly proposed holding and release mechanisms.
Article
Engineering, Aerospace
Bong-Geon Chae, Hyun-Ung Oh
Summary: This study introduces the Power Plant Trio (PPT) CanSat platform developed by the University of Chosun, South Korea, focusing on the evaluation of solar, wind, and piezoelectric energy harvesting systems, as well as wireless transmission of solar energy through magnetic resonance. Ground tests confirmed compliance with design requirements and effectiveness of the system.
INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
(2021)
Article
Engineering, Aerospace
Seong-Cheol Kwon, Ji-Hae Son, Sung-Chan Song, Jin-Han Park, Kyung-Rae Koo, Hyun-Ung Oh
Summary: The S-STEP mission aims to develop a small SAR satellite with innovative thermo-mechanical design approaches, including flat plate-type structure, multifunctional TR module, and VFOD. Structural analysis and development tests confirm the effectiveness of the design.
Article
Engineering, Aerospace
Tae-Yong Park, Se-Young Kim, Dong-Woo Yi, Hwa-Young Jung, Jae-Eun Lee, Ji-Hyeon Yun, Hyun-Ung Oh
Summary: This study focuses on the preliminary thermal design and analysis of a carbon fiber reinforced plastic skin-based unfurlable parabolic reflector for spaceborne SAR antennas. It highlights the importance of passive thermal designs with different coatings to minimize thermal distortion and gradient for optimal SAR performance. Additionally, the impact of solar panels on the reflector's thermal gradient is also investigated to further enhance antenna gain and SAR performance.
INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
(2021)
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)