Article
Chemistry, Physical
Kejing Ma, Ting Tan, Zhimiao Yan, Fengrui Liu, Wei-Hsin Liao, Wenming Zhang
Summary: A novel metamaterial and Helmholtz coupled resonator (MHCR) are proposed in this paper to enhance sound energy density through energy focusing and pressure amplification, with promising results in increasing the transmission ratio and voltage output of energy harvesters.
Article
Chemistry, Multidisciplinary
Haichao Yuan, Hongyong Yu, Xiangyu Liu, Hongfa Zhao, Yiping Zhang, Ziyue Xi, Qiqi Zhang, Ling Liu, Yejin Lin, Xinxiang Pan, Minyi Xu
Summary: The study proposed a low-cost, easily fabricated and high-performance CHR-TENG for acoustic energy harvesting, achieving a 58.2% higher power density and powering up to five LED bulbs, representing a practical approach for powering sensor devices in the age of the Internet of Things.
Article
Chemistry, Physical
Tianrun Li, Zhemin Wang, Hanjie Xiao, Zhimiao Yan, Cheng Yang, Ting Tan
Summary: This study introduces a Helmholtz acoustic metamaterial (HAM) piezoelectric device with dual-band acoustic energy harvesting characteristics, which amplifies both structural and local resonances for improved energy conversion efficiency. Numerical simulations and experimental results demonstrate that the energy conversion efficiency of HAM is significantly higher than that of traditional acoustic metamaterials in both structural and local resonance bands.
Article
Chemistry, Multidisciplinary
Xiu Xiao, Ling Liu, Ziyue Xi, Hongyong Yu, Wenxiang Li, Qunyi Wang, Cong Zhao, Yue Huang, Minyi Xu
Summary: This paper proposes a novel acoustic triboelectric nanogenerator (QWR-TENG) for efficient low-frequency acoustic energy harvesting, aiming to provide power for the distributed nodes of the rapidly developing Internet of Things technology. Simulation and experimental studies show that the optimized QWR-TENG has excellent electrical output performance with a maximum output voltage of 255 V, a short-circuit current of 67 muA, and a transferred charge of 153 nC under the acoustic frequency of 90 Hz and sound pressure level of 100 dB. Furthermore, a conical energy concentrator is introduced, and a composite quarter-wavelength resonator-based triboelectric nanogenerator (CQWR-TENG) is designed to enhance the electrical output. The results demonstrate that the maximum output power and power density per unit pressure of CQWR-TENG reach 13.47 mW and 2.27 WPa(-1)m(-2), respectively. Application demonstrations indicate that QWR/CQWR-TENG has good capacitor charging performance and is expected to provide power supply for distributed sensor nodes and other small electrical devices.
Article
Acoustics
H. Hoppen, F. Langfeldt, W. Gleine, O. von Estorff
Summary: This paper presents the acoustical properties and theoretical descriptions of a Helmholtz resonator with an integrated cantilever. The resonator design allows for a second resonance frequency, resulting in an additional frequency region with high sound absorption properties. Analytical models are used to calculate the resonance frequencies and absorption coefficient of the system, which have been validated through finite element simulations and experimental measurements. The study concludes that geometric parameters significantly influence the resonance frequencies and that the coupled resonator system exhibits a broader sound absorption performance.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Mingyang Zheng, Chao Chen, Xiaodong Li
Summary: Restricted by resonance principle, Helmholtz resonators can only effectively absorb noise near the resonance frequency. Coupling multiple resonators is an effective way to broaden the absorption band. In this study, numerical simulations and experiments are conducted to investigate the influence of grazing flow and sound incident direction on the acoustic performance. The results show that grazing flow weakens noise suppression ability and alters the acoustic characteristics of the system, while changing the sound incidence direction can mitigate the negative impact.
Article
Chemistry, Physical
Sangtae Kim, Jaehoon Choi, Hong Min Seung, Inki Jung, Ki Hoon Ryu, Hyun-Cheol Song, Chong-Yun Kang, Miso Kim
Summary: This study combines Helmholtz resonance and omnidirectional acoustic wave focusing to generate high power output at low frequencies in ambient sound environments. A two-degree-of-freedom model is used to design a HR integrated with a piezoelectric device, which is then combined with a circularly symmetric gradient index phononic crystal structure for omnidirectional sound focusing. The coupled acoustic system GRIN-HR-PEH demonstrates flexibility in design and achieved an output power of up to 4.1 mW under ambient sound pressure of 47 dB.
Article
Physics, Applied
Xiaobin Cui, Jinjie Shi, Xiaozhou Liu, Yun Lai
Summary: The study introduces and demonstrates an acoustic energy harvester utilizing an acoustic metasurface and Helmholtz resonator, which significantly increases sound intensity and open voltage at the working frequency, showing high efficiency, flat geometry, and scalability.
APPLIED PHYSICS LETTERS
(2021)
Article
Instruments & Instrumentation
Hanjie Xiao, Ting Tan, Tianrun Li, Liang Zhang, Chaolian Yuan, Zhimiao Yan
Summary: This study investigates energy localization in Helmholtz acoustic metamaterials (HAMs) with multiple point defects within two defect bands through numerical simulations and experimental analysis. By intentionally removing multiple Helmholtz resonators (HRs) from the HAM, the localized interaction of elastic waves within these defects enhances the energy harvesting efficiency of the HAM. The results show that the double-defect HAM structures outperform the single-defect HAM in both the first and second band gaps, with the energy harvesting intensifying as the distance between the defects decreases.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Lingling Wu, Zirui Zhai, Xinguang Zhao, Xiaoyong Tian, Dichen Li, Qianxuan Wang, Hanqing Jiang
Summary: This study introduces a modular design method to create acoustic metamaterials based on nested Helmholtz resonators for low-frequency sound attenuation, utilizing finite element methods and genetic algorithms. The optimized acoustic metamaterials demonstrate noise attenuation properties in both simulated and experimental results, showing potential for practical sound attenuation applications in industries by considering different environments and constraints.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Energy & Fuels
Fariba Ebrahimian, Zohre Kabirian, Davood Younesian, Pezhman Eghbali
Summary: The utilization of auxetic concept enhances output electrical power and reduces resonance frequency for piezoelectric vibration energy harvesting. Finite element modeling is used to evaluate and optimize structures for optimal energy harvesting performance. Experimental tests demonstrate the significant increase in harvested electrical power with the new designs.
Article
Nanoscience & Nanotechnology
Degang Zhao, Xincheng Chen, Pan Li, Xue-Feng Zhu
Summary: In this study, subwavelength acoustic energy harvesting via topological interface states in 1D Helmholtz resonator arrays was theoretically and experimentally demonstrated. Two types of bandgaps were produced due to resonance and band folding mechanism. The topological properties of band-folding-induced gaps could be modified by adjusting lattice structural parameters, while resonant gaps remained stable. Topological interface states only appeared in band-folding-induced band gaps when different arrays were spliced together, and experimental measurements confirmed the theoretical predictions. The study expands the applicability of acoustic topological insulators in a compact platform.
Article
Engineering, Mechanical
Hyeonbin Ryoo, Wonju Jeon
Summary: A thin acoustic metasurface is proposed for broadband absorption of low-frequency sound using hybrid resonances at multiple target frequencies, achieving lower Q-factors compared to existing absorbing structures. The design procedures allow for perfect sound absorption at multiple target frequencies, opening possibilities for practical applications in noise mitigation of various mechanical systems.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Qiqi Zhang, Ziyue Xi, Yawei Wang, Ling Liu, Hongyong Yu, Hao Wang, Minyi Xu
Summary: This study investigates a triboelectric nanogenerator (MH-TENG) based on a multi-tube parallel Helmholtz resonator for harvesting sound energy in low-frequency noise environments. The experiments demonstrate that the multi-tube Helmholtz resonator structure improves the collection efficiency of sound waves and significantly enhances the power generation performance and bandwidth of the MH-TENG.
FRONTIERS IN MATERIALS
(2022)
Article
Crystallography
Qinglei Zeng, Shenlian Gao, Yun Lai, Xiaozhou Liu
Summary: In this paper, we demonstrate the remarkable improvement in the directionality of acoustic radiation at low frequencies by using acoustic metamaterials arranged as an array of quadrupoles, compared with previous metamaterials arranged as monopole and dipole structures. The directivity can be adjusted by changing the characteristic parameter and symmetry of the structure, providing a flexible method of adjusting radiation directions. Furthermore, the directionality can be further improved by constructing a linear array. This work establishes the control of acoustic radiation via quadrupolar metamaterials.
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)