Article
Thermodynamics
Chaoran Liu, Rui Zhao, Kaiping Yu, Heow Pueh Lee, Baopeng Liao
Summary: A novel quasi-zero-stiffness (QZS) device is proposed for vibration isolation and energy harvesting by converting vibrational energy into electrical energy and reducing energy transmitted to the vibration receiver. Experimental results demonstrate the device's advantages of low isolation frequency and high energy output.
Article
Acoustics
Peng Ling, Lunlun Miao, Bingliang Ye, Jin You, Wenming Zhang, Bo Yan
Summary: Inspired by the three postures of a click beetle, a novel passive click-beetle-inspired structure (CBIS) with variable asymmetric stiffness characteristics is proposed and systematically investigated for stiffness tunning and low-frequency vibration isolation. The stiffness of CBIS can be easily tuned among negative, quasi-zero, zero, small positive by the initial assembly angle, length ratio and linear stiffness ratio. The zero stiffness (ZS) or quasi-zero stiffness (QZS) region of CBIS can be extremely huge under some special parameters, which can broaden the working range of CBIS and benefit to large-deflection vibration isolation. The proposed CBIS opens a new route towards tunning asymmetric stiffness for low frequency vibration isolation.
JOURNAL OF SOUND AND VIBRATION
(2023)
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
Engineering, Mechanical
Chen Zhang, Junsen He, Guiqian Zhou, Kai Wang, Daolin Xu, Jiaxi Zhou
Summary: The study proposes a compliant quasi-zero-stiffness (CQZS) isolator to isolate low-frequency torsional vibrations in the shaft system. The configuration of the CQZS isolator is devised using a compliant mechanism, and its stiffness characteristics are deduced and verified analytically and numerically. A dynamic model of the shaft system integrated with the CQZS isolator is established, and theoretical analysis is conducted using the harmonic balance method. Experimental results confirm the effectiveness of the CQZS isolator in achieving ideal torsional quasi-zero-stiffness characteristics and low-frequency torsional vibration isolation. The proposed CQZS isolator is more compact, lightweight, and easier to manufacture than conventional isolators.
MECHANISM AND MACHINE THEORY
(2023)
Article
Engineering, Mechanical
Yuntian Zhang, Qingjie Cao, Wenhu Huang
Summary: This paper investigates bursting oscillations in a vibration isolation system with quasi-zero stiffness to improve efficiency and reliability. The complex nonlinear dynamics are studied through bifurcation analysis, and an approximation method for force transmissibility is proposed. The results show that bursting is caused by transitions from equilibrium to limit cycle and equilibrium jumping, with the weakest bursting occurring when the system behaves in a single equilibrium state.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Acoustics
Ge Yan, Zhi-Yuan Wu, Xin-Sheng Wei, Sen Wang, Hong-Xiang Zou, Lin-Chuan Zhao, Wen-Hao Qi, Wen-Ming Zhang
Summary: Various quasi-zero stiffness (QZS) vibration isolators have been successfully applied in low-frequency vibration isolation in recent years. However, the current approach is limited to compensating the negative stiffness of bistable structures using linear springs. This study proposes a nonlinear compensation method and verifies its effectiveness through a confirmatory system.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Chemistry, Multidisciplinary
Quan Zhang, Dengke Guo, Gengkai Hu
Summary: A new design strategy for a programmable quasi-zero-stiffness (QZS) mechanical metamaterial is proposed in this research, which can achieve tailored stair-stepping force-displacement curves with multiple QZS working ranges and ultra-low frequency vibration isolation capability. The mechanism solely depends on the structural geometry of curved beams and is materials-independent, opening up a new avenue for innovating compact and scalable QZS isolators.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Automation & Control Systems
Bo Yan, Peng Ling, Lunlun Miao, Ning Yu, Jiaojiao Sun, Qinchuan Li
Summary: This work presents a cockroach-inspired structure coupled with electromagnetic shunt damping (EMSD) for ultra-low frequency vibration isolation. The EMSD includes linear damping and nonlinear damping achieved through geometric nonlinearity. By adjusting the geometric parameters and assembly configuration, the electromagnetic coupling coefficient can be increased, resulting in enhanced equivalent damping. Experimental results demonstrate the effectiveness of EMSD in reducing the transmission rate of ultra-low frequency vibration without significant impact on high-frequency vibration isolation.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Engineering, Mechanical
Yang Zhang, Xi Wang, Qianzheng Du, Tao Wang, Guoqiang Fu, Caijiang Lu
Summary: The purpose of this paper is to propose an energy harvester with quasi-zero stiffness, capable of generating electricity effectively through large amplitude vibration at low frequency, and having a simple structure, light weight, and high working efficiency. The proposed energy harvester adopts a levitating magnet composed of a multi-magnet array, which experiences little resultant force in a larger motion range, exhibiting quasi-zero stiffness characteristics. In the experiment, the LED array is successfully lit, and the maximum output power of the system can reach 1 mW under specific excitation conditions, demonstrating the high working efficiency of the energy harvester.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Mechanical
Zhao-Yang Xing, Xiao-Dong Yang
Summary: The vibration control performance of a combined vibration isolation system is investigated, which consists of a quasi-zero stiffness system and a linear dynamic vibration absorber. The dynamic equation is established and the amplitude-frequency response of the system is deduced and verified. The mechanism and tuning rule for the system are revealed, and the control performance is analyzed in terms of various factors. The results show that the system effectively suppresses vibration amplitude and broadens the isolation frequency band, providing valuable reference for improving control performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Jia-Jia Lu, Ge Yan, Wen-Hao Qi, Han Yan, Jun-Wei Shi, Ao Chen, Wen-Ming Zhang
Summary: In this study, a load-adaptive electromagnetic QZS vibration isolator (LEQVI) is proposed, which can achieve a wide vibration isolation bandwidth and effective vibration attenuation by flexibly adjusting its rated load through regulating the excitation current.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Thermodynamics
Ge Shi, Yansheng Peng, Dike Tong, Jian Chang, Qing Li, Xiudeng Wang, Huakang Xia, Yidie Ye
Summary: This study introduces an ultra-low frequency vibration energy harvester using a zigzag piezoelectric spring oscillator, which offers efficient energy output under slight vibrations in the external environment. The performance of the energy harvester can be optimized by adjusting the length of the spring and the mass of the ball, and experimental results demonstrate its potential to power low-power electronic devices and wireless sensor nodes.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Multidisciplinary
Mohammad Abuabiah, Yazan Dabbas, Luqman Herzallah, Ihab H. Alsurakji, Mahmoud Assad, Peter Plapper
Summary: A vibration isolation system for vehicle seats has been designed in this study, which utilizes oblique springs, a vertical spring, and a sleeve air spring to achieve quasi-zero stiffness and support additional load. The system improves the vibration isolation performance of the seats for small vehicles.
APPLIED SCIENCES-BASEL
(2022)
Review
Engineering, Electrical & Electronic
Zhaozhao Ma, Ruiping Zhou, Qingchao Yang
Summary: This paper comprehensively reviews recent research on quasi-zero stiffness (QZS) vibration isolators, focusing on their principle, structural design, and vibration isolation performance. The paper also summarizes the development trends and challenges of QZS vibration isolators, as well as the advantages of passive and active/semi-active systems.
Article
Engineering, Mechanical
Tian-Yu Zhao, Ge Yan, Wen-Hao Qi, Jia-Jia Lu, Wen-Ming Zhang
Summary: This study presents a magnetically modulated tetrahedral structure (MMTS) that can achieve quasi-zero-stiffness (QZS) under different loads. By adjusting the negative stiffness of the tetrahedral structure and the hardening stiffness of the repulsive magnets, QZS can be achieved with flexible and adjustable performance. Experimental results demonstrate that the MMTS can effectively suppress frequency components above 4 Hz under different external excitations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Instruments & Instrumentation
Hongchen Miao, Lei Xu, Hao Zhang
SMART MATERIALS AND STRUCTURES
(2019)
Article
Instruments & Instrumentation
Lei Xu, Zhihai Xiang
Summary: A new electromagnetic multi-modal energy harvester is designed in this study, which operates in a broad and continuous low-frequency bandwidth. By adjusting the amplitudes and phases of the magnet and the coil in different modes, voltage can be generated in a continuous and wide range of frequencies. Experimental results validate the performance and potential of the harvester.
SMART MATERIALS AND STRUCTURES
(2022)
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)