Article
Engineering, Electrical & Electronic
Shiping Chen, Zhanqing Yu, Ya Mou, Jiaxu Shi
Summary: This paper conducts a parametric analysis of the comb-driven resonator by investigating the electrostatic force and damping terms using analytical models and finite element model. The results show that for an electrostatic comb resonator oscillating at atmospheric pressure, a thin polysilicon film can be used to design narrow comb fingers that are dense in the vertical direction and loose in the lateral direction to achieve high-voltage driving efficiency. The experimental results validate the accuracy of the model and the effectiveness of parameter optimization.
JOURNAL OF SENSORS
(2023)
Article
Automation & Control Systems
Markus Raab, Marco Hutter, Arif Kazi, Wolfgang Schinkoethe, Bernd Gundelsweiler
Summary: This article introduces a magnetically levitated linear drive for precision engineering with integrated active gravity compensation. The mechanical design is based on geometrically decoupled horizontal and vertical guidance axes, achieving high precision. The system utilizes novel hybrid shape memory actuators for gravity compensation, resulting in compact, energy efficient, and abrasion-free actuators.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Engineering, Electrical & Electronic
Ruihao Zhang, Jiasheng Qu, Yingchao Cao, Xinchao Zhang, Yilong Jia, Xiaoyi Wang, Wenbiao Zhou, Huikai Xie
Summary: In this study, a real-time capacitive sensing scheme based on electromechanical amplitude modulation is developed to detect the scanning angle and phase of a uniaxial electrostatic comb-drive micromirror for close loop control. Experimental results show that using a carrier signal with 2.5 Vpp and 1 MHz, the measurement accuracy of the scanning angle of the micromirror reaches 0.15 degrees and the time delay can be controlled within 0.47 microseconds. The proposed capacitive sensing scheme can effectively measure the angular position and phase of electrostatic comb-drive MEMS mirrors simultaneously without the need of adding any external components.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Automation & Control Systems
Bobo Helian, Zheng Chen, Bin Yao, Litong Lyu, Chen Li
Summary: Direct-driven electro-hydraulic systems have energy-saving and control flexibility advantages, but limited control accuracy due to nonlinear hydraulic dynamics and pump flow nonlinearity. This article proposes an adaptive robust motion control strategy with polynomial fitting model compensation for precise motion control, demonstrating advantages in stability and parameter estimation.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Review
Multidisciplinary Sciences
C. Gonzalez-Ballestero, M. Aspelmeyer, L. Novotny, R. Quidant, O. Romero-Isart
Summary: The control and manipulation of levitated nano- and micro-objects in vacuum, utilizing scientific achievements in various disciplines, offer great potential for both scientific research and technological applications. Recent experimental successes, such as achieving motional ground-state cooling of optically levitated nanoparticles, have opened up attractive research directions ranging from fundamental quantum physics to commercial sensors. Levitodynamics, as a multidisciplinary research area, is devoted to understanding, controlling, and utilizing levitated nano- and micro-objects in vacuum.
Article
Engineering, Electrical & Electronic
Haythem Ameur, Patrice Le Moal, Gilles Bourbon, Cedric Vuillemin, Marc Sworowski
Summary: This paper presents a voltage-controlled technique to suppress residual vibrations in high voltage electrostatic comb-drive actuators. Experimental validations demonstrate a significant reduction in residual vibrations through the optimization of command signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Multidisciplinary
Guancheng Liu, Yonghua Lu, Jiajun Xu, Zhanxiang Cui, Haibo Yang
Summary: This paper proposes a magnetic levitation actuation and motion control system with active levitation mode, which generates the actuating force through an external magnetic field. The system incorporates a neural network PID controller for active actuation and a force imbalance principle for step motion mode. Dual electromagnetic actuators are used to ensure a more uniform and stable electromagnetic force on the ball. Dual-hall-structure sensors are employed to measure displacement and improve stability and overshoot. The PID controller composed of neurons shows strong adaptability due to the neural network's ability to handle complex systems with nonlinear and ambiguous models. Moreover, the proposed controller resolves the issue of increased deviation and deteriorating tracking performance between the controlled object and the steady-state operating point. The system achieves robustness and stability in active levitation and motion control during both ascending and descending processes.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Multidisciplinary
Zhenyu Wang, Yunshan Cao, Z. X. Li, Rembert A. Duine, Peng Yan
Summary: The study investigates the generation of a magnonic frequency comb in magnonic systems through a nonlinear scattering process involving three magnons, with the mode spacing of the comb tunable by adjusting the breathing-mode frequency of the skyrmion. The theoretical prediction was confirmed through micromagnetic simulations, suggesting a potential pathway for observing frequency comb structures in magnonic devices and exploring fundamental nonlinear physics in spintronic platforms.
PHYSICAL REVIEW LETTERS
(2021)
Article
Instruments & Instrumentation
Keping Liu, Shuai Yu, Zhenguo Zhang, Piao Fan, Tinghai Cheng, Xiaohui Lu
Summary: In this paper, a composite control strategy combining stepping and scanning modes is proposed to overcome the difficulties in achieving nanopositioning over large travel and the negative effects of hysteresis characteristics and external disturbances. An integral back-stepping linear active disturbance rejection control (IB-LADRC) strategy is introduced in the scanning mode, which uses a linear extended state observer to estimate displacement, velocity, and total disturbance in real time. Simulation and experimental results demonstrate that the IB-LADRC algorithm effectively improves the positioning accuracy of the PSSNS system.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Automation & Control Systems
David Brunner, Stephan Albert, Marcus Hennecke, Franz Darrer, Georg Schitter
Summary: This paper introduces a novel self-sensing control concept for resonant MEMS mirrors, which is based on comb-drive current and simple circuitry. The method can immediately compensate phase errors and accurately detect mirror amplitude, providing precise control without the need for additional sensors or complex circuitry.
Review
Computer Science, Information Systems
Wenjing Han, Yuanwen Cai, Wenting Han, Zengyuan Yin, Chunmiao Yu
Summary: This article provides a detailed overview of the research status of unbalanced vibration in magnetically suspended systems, including system structure, working principle, and causes of unbalanced vibration. The advantages and disadvantages of active vibration control methods are summarized, and future development trends are prospected.
Article
Multidisciplinary Sciences
Kai Wang, Mingliang Yang, Yang Li, Zibin Liu, Haiying Wang, Weiping Ding
Summary: This article proposes an extreme speed estimation method based on dynamic boundary and a multidirectional motion coupling control law design method based on multi degrees of freedom vehicle dynamic model to improve the multidirectional motion control accuracy and driving stability of DDAVs under extreme conditions.
SCIENTIFIC REPORTS
(2022)
Review
Engineering, Electrical & Electronic
Pieter Bauwens, Sander Cornelis, Jan Doutreloigne
Summary: A novel driver for a comb drive actuator was designed with the aim of achieving large displacement and high resolution. By examining a charge controlled driver, a more linear behavior was proposed to increase achievable displacement resolution. A comparison between voltage control and charge control actuators showed that the stability range is larger under charge control.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Review
Engineering, Multidisciplinary
QiuHua Gao, Han Yan, HongXiang Zou, WenBo Li, ZhiKe Peng, Guang Meng, WenMing Zhang
Summary: Magnetic levitation, utilizing diamagnetism, is a contact-free manipulation technique that has become increasingly popular in various applications. It offers passive stable levitation without energy input, allowing for the stable levitation of magnetic materials.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Chemistry, Analytical
Koji Hasegawa, Manami Murata
Summary: This study aimed to improve and investigate the oscillation dynamics and levitation stability of acoustically levitated water droplets. The number and position of levitated droplets were found to be crucial for levitation stability.
Review
Materials Science, Multidisciplinary
Yanxia Wu, Shengxi Wang, Kyriakos Komvopoulos
JOURNAL OF MATERIALS RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Xiao-Guang Ma, Kyriakos Komvopoulos
JOURNAL OF MATERIALS RESEARCH
(2020)
Article
Mechanics
J. Yang, K. Komvopoulos
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Mechanics
Z. Vangelatos, K. Komvopoulos, J. Spanos, M. Farsari, C. Grigoropoulos
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
Shengxi Wang, Kyriakos Komvopoulos
Article
Mechanics
J. Cen, K. Komvopoulos
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Multidisciplinary Sciences
Joseph P. Wood, Matthew Magnuson, Abderrahmane Touati, Jerome Gilberry, Jonathan Sawyer, Timothy Chamberlain, Stella McDonald, David Hook
Summary: Research has shown that disinfection is recommended to limit the spread of the COVID-19 disease caused by airborne transmission of the SARS-CoV-2 virus. Evaluation of spray parameters for various types of sprayers and foggers revealed that most devices produce spray droplets of suitable size and effectively cover objects.
Article
Materials Science, Multidisciplinary
Maria I. Echeverria Molina, Kyriakos Komvopoulos
Summary: This paper emphasizes the importance of understanding the deposition process of electrospun fibers and presents an analysis of how electric potential intensity and directionality affect the deposition of fibers. The study provides guidance for designing electrospinning setups capable of producing microfibrous constructs with tailored morphologies.
Article
Construction & Building Technology
Katherine M. Ratliff, Lukas Oudejans, John Archer, Worth Calfee, Jerome U. Gilberry, David Adam Hook, William E. Schoppman, Robert W. Yaga, Lance Brooks, Shawn Ryan
Summary: The COVID-19 pandemic has increased interest in technologies that claim to reduce airborne pathogens. However, the efficacy of these emerging technologies is not fully understood, and there is no standard test method for evaluating them, making it difficult to compare results.
BUILDING AND ENVIRONMENT
(2023)
Review
Materials Science, Multidisciplinary
Anurag Roy, Shengxi Wang, Kyriakos Komvopoulos
Summary: Amorphous carbon films are widely used as protective coatings due to their unique thermophysical properties and strong adherence. To meet the demands of device miniaturization, thinning a-C films to a few nanometers while preserving important properties is crucial. This article provides a comprehensive assessment of effective deposition techniques for synthesizing ultrathin films, particularly a-C films, and discusses microanalysis methods and technological challenges in the field.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Chemistry, Physical
Maria I. Echeverria I. Molina, Chi-An Chen, Jeniree Martinez, Perry Tran, Kyriakos Komvopoulos
Summary: Fully functional skin regeneration is still difficult after decades of research. Scaffold engineering, a leading field in skin substitutes, can optimize the biomolecular exchange to promote the formation of high-quality tissue. This study designed and evaluated a new class of three-dimensional fibrous scaffolds that induce keratinocyte differentiation through calcium leaching, demonstrating their potential for tissue engineering.
Article
Biophysics
Maria I. Echeverria Molina, Kyriakos Komvopoulos
Summary: Polymer degradation and mechanical properties play a crucial role in tissue engineering. In this study, the degradation behavior of electrospun PLLA bilayer microfibrous scaffolds in a pH-neutral medium was investigated. The interplay between chain scission and orderly chain rearrangement during degradation was found to be critical. The bilayer PLLA scaffolds with adequate matrix stiffness showed potential for tissue engineering and drug delivery applications.
JOURNAL OF BIOMECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Tianzong Xu, Kyriakos Komvopoulos
Summary: The nucleation and growth of diamond from submicron clusters consisting of amorphous carbon phase and diamond nanocrystallites were investigated. The carbon clusters were created by exposing a highly sp(3)-hybridized carbon thin film to a low-temperature, methane-rich hydrogen plasma. Diamond nanocrystallites inside the carbon clusters acted as nucleation sites. The results provided insights into the structure and composition of the carbon clusters, diamond nanocrystallites, and amorphous interlayers at the interfaces.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Mechanics
Rui Xu, Kyriakos Komvopoulos
Summary: This study aims to develop an effective computational mechanics framework for analyzing the stress distribution of dynamic microdevices with different polycrystalline microstructures. Dynamic finite element analysis and steady-state finite element analysis were performed to investigate the effect of material damping on the dynamic response and the influence of texture anisotropy on stress distribution. Probabilistic stress analysis was conducted to explore the stochastic nature of stress in the critical region due to variations in grain geometry, size, and orientation.
Article
Engineering, Mechanical
Rui Xu, Kyriakos Komvopoulos
Summary: This study analyzed fatigue crack growth in polysilicon under multi-axial loading using the finite element method, revealing the significant effect of local grain orientation on crack growth direction and rate.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
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)
