Article
Automation & Control Systems
Aleksandra Mitrovic, William S. Nagel, Kam K. Leang, Garrett M. Clayton
Summary: This article presents a closed-loop control framework for dual-stage nanopositioning systems, allowing control efforts to be allocated based on the range capabilities of individual actuators. The focus is on range-based control methods and addressing control issues when sensor measurements are only available from the total output of the system. The study shows significant improvement in tracking accuracy using the proposed range-based control structure compared to frequency-based methods.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Chemistry, Physical
Michal Bodik, Michaela Sojkova, Martin Hulman, Milan Tapajna, Martin Truchly, Karol Vegso, Matej Jergel, Eva Majkova, Marianna Spankova, Peter Siffalovic
Summary: The tribological properties of MoS2 films can be optimized by adjusting the crystallographic orientation, leading to different friction behaviors. Horizontally oriented MoS2 sheets exhibit a lower coefficient of friction compared to vertically oriented sheets.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Takashi Sumikama, Filippo Federici Canova, David Z. Gao, Marcos Penedo, Keisuke Miyazawa, Adam S. Foster, Takeshi Fukuma
Summary: In this study, the 3D-AFM method was used to resolve the three-dimensional structures of biopolymers. A computational method using the Jarzynski equality was developed to simulate 3D-AFM images, and it was found that some parts of the fiber structure of biopolymers were resolved in the images. The dependency of 3D-AFM images on scanning velocity was investigated, and optimum scanning velocities were determined. It was also clarified that forces in nonequilibrium processes could be measured in 3D-AFM measurements when the dynamics of polymers were slower than the scanning of the probe.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Ryota Fukuzawa, Daichi Kobayashi, Takuji Takahashi
Summary: Electrostatic force microscopy (EFM) is used to examine the electrostatic force between an AFM tip and sample surface, allowing evaluation of their capacitance and surface potential. The dependences of the electrostatic force on dc voltage and ac voltage frequency can be used to investigate carrier density, carrier type, and deep-level states in a semiconductor. Proper distance control is necessary in EFM to ensure accurate measurements, and the oscillation amplitude of a cantilever can be effectively used for feedback control. The 1 A-mode operation in EFM shows good robustness against the strong electrostatic force and allows proper measurements of tip-sample capacitance.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Automation & Control Systems
Xiangdi Kong, Baoping Cai, Yonghong Liu, Hongmin Zhu, Chao Yang, Chuntan Gao, Yiqi Liu, Zengkai Liu, Renjie Ji
Summary: Faults in closed-loop feedback control systems are difficult to identify. Redundancy improves system reliability but poses new challenges for fault diagnosis in multiple redundant systems. This study proposes a causality-based method using dynamic Bayesian networks for fault diagnosis, which dynamically evaluates system performance and integrates monitoring information to assist diagnosis and location.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2023)
Article
Physics, Multidisciplinary
Simone Benaglia, Manuel R. Uhlig, Jose Hernandez-Munoz, Enrique Chacon, Pedro Tarazona, Ricardo Garcia
Summary: This study demonstrates that the generation of 3D maps is dependent on the polarization of the tip, with differently charged tips revealing different density distributions. Experimental data reproduce key findings of the theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Automation & Control Systems
Longfei Tang, Wei Chen, Zhihong Xu
Summary: This article proposes a direct electromagnetic force closed-loop control strategy for a contactor, which accurately controls the dynamic process of the contactor by observing the real-time electromagnetic force and combining mechanical equations and spring reaction equations.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Chemistry, Analytical
Andreas Karg, Sebastian Goedrich, Philipp Dennstedt, Nicolas Helfricht, Markus Retsch, Georg Papastavrou
Summary: Scanning electrochemical microscopy (SECM) is a versatile technique for monitoring electrochemical reactions on a highly resolved local scale. This research presents a novel approach to implement a three-electrode setup for SECM in any fluid cell, allowing for high-resolution imaging and equivalent electrochemical performance to macroscopic electrodes.
Article
Nanoscience & Nanotechnology
Keivan Asadi, Junghoon Yeom, Hanna Cho
Summary: Investigating internal resonance (IR) mechanisms in micro/nanoresonators reveals that intermodal coupling between second and third flexural modes in asymmetric structures provides an optimal condition for strong IR, with high energy transfer to the resonated mode. This study introduces design strategies that can be easily integrated into typical micro/nanoelectromechanical systems, offering potential for paradigm-shifting applications in micro/nanosystems.
MICROSYSTEMS & NANOENGINEERING
(2021)
Editorial Material
Multidisciplinary Sciences
Telmo O. Paiva, Albertus Viljoen, Yves F. Dufrene
Summary: Advancements in atomic force microscopy (AFM) techniques and methodologies in microbiology have enhanced our understanding of microbial cell surfaces. Recent studies have shown that AFM imaging of cells and membranes at or near molecular resolution enables detailed visualization of membrane-drug interactions.
NATURE COMMUNICATIONS
(2022)
Article
Automation & Control Systems
Zhenrui Cao, Yingxue Du, Jianlong Qiu, Ancai Zhang, Zhi Liu
Summary: This paper investigates the hybrid control strategy (HCS) for time-varying delay positive switched linear systems (PSLS) with unstable modes. The HCS, including minimum switching strategy and discretized state feedback controller, is applied to PSLS with time-varying delay for the first time. A sufficient condition of globally uniformly asymptotically stable (GUAS) under the HCS is given using the discretized multiple linear copositive Lyapunov-Krasovskii functional. The HCS is also extended to discrete-time positive switched time delay systems, and a delay independent stabilization condition is obtained in the discrete system. The effectiveness of the HCS is verified by two simulation examples.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Automation & Control Systems
Kuan Li, Hao Luo, Shen Yin, Okyay Kaynak
Summary: This article introduces a novel data-driven bias-eliminated subspace identification approach for closed-loop systems, which effectively eliminates the pole estimation bias caused by the correlation between inputs and noise under feedback control. The proposed method establishes a general framework applicable to both open-loop and closed-loop system identification, and outperforms other closed-loop methods in terms of performance comparisons. The effectiveness of the identified system is further demonstrated in the vehicle lateral dynamic system.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Physics, Applied
Shiquan Lin, Zhong Lin Wang
Summary: Inspired by TENG, scanning TENG is proposed for local surface charge density measurement using atomic force microscopy. The technique taps a conductive tip above a charged dielectric surface to induce an AC, with Fourier analysis showing a linear relation to surface charge density. Results demonstrate its power in probing nanoscale charge transfer in contact-electrification.
APPLIED PHYSICS LETTERS
(2021)
Article
Biochemical Research Methods
Suleman A. Naz, Van Thanh Huynh, Egan H. Doeven, Scott Adams, Abbas Kouzani, Rosanne M. Guijt
Summary: The adoption of mechatronic approaches has been driven by the demand for accurate control of the flowrate/pressure in chemical analytical systems. In the development of portable analytical devices, considering the instrument as a mechatronic system can help mitigate compromises made to decrease space, weight, or power consumption. Closed loop control systems have been effectively used to decrease the difference between desired and realized fluidic output. This review discusses the implementation of control systems for enhanced fluidic control, categorized by pump type, along with advanced control strategies and their implementation in portable analytical systems.
JOURNAL OF CHROMATOGRAPHY A
(2023)
Article
Chemistry, Physical
Miles F. Beaux, Reuben J. Peterson, Igor O. Usov
Summary: Atomic force microscopy was used to map the topography and qualitative mechanical characteristics of gallium-stabilized delta-phase plutonium coupons. The initial rough and heterogeneous surface of plutonium was observed, along with distinct striation patterns in qualitative nanomechanical mapping. Investigation suggested that the striations were not measurement artifacts or plutonium-specific features, and were influenced by mechanical working of the surface.
SURFACES AND INTERFACES
(2021)
Article
Automation & Control Systems
Dejun Guo, William S. Nagel, Garrett M. Clayton, Kam K. Leang
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2020)
Article
Robotics
Dejun Guo, Kam K. Leang
INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH
(2020)
Article
Automation & Control Systems
Aleksandra Mitrovic, Kam K. Leang, Garrett M. Clayton
Article
Robotics
Joseph R. Bourne, Matthew N. Goodell, Xiang He, Jake A. Steiner, Kam K. Leang
INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH
(2020)
Article
Automation & Control Systems
Katharin R. Jensen-Nau, Tucker Hermans, Kam K. Leang
Summary: This article presents a Voronoi-based path generation algorithm for energy-constrained mobile robots, utilizing mass-spring-damper systems and Voronoi diagrams to optimize path generation. The algorithm showcases linear-time complexity, versatility in generating paths for various area shapes, and striking a balance between runtime and optimization performance.
IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING
(2021)
Article
Automation & Control Systems
Aleksandra Mitrovic, William S. Nagel, Kam K. Leang, Garrett M. Clayton
Summary: This article presents a closed-loop control framework for dual-stage nanopositioning systems, allowing control efforts to be allocated based on the range capabilities of individual actuators. The focus is on range-based control methods and addressing control issues when sensor measurements are only available from the total output of the system. The study shows significant improvement in tracking accuracy using the proposed range-based control structure compared to frequency-based methods.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Environmental Sciences
Nipun Gunawardena, Kam K. Leang, Eric Pardyjak
Summary: In this work, a method using particle swarm optimization (PSO) to localize a source in complex urban environments was proposed and successfully tested. The PSO algorithm was able to accurately locate the contaminant source even in the presence of obstacles in the environment.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Instruments & Instrumentation
Rebecca Histed, Justin Ngo, Omar A. Hussain, Chantel K. Lapins, Omid Fakharian, Kam K. Leang, Yiliang Liao, Matteo Aureli
Summary: This study focuses on the development of tailored 3D-structured polymer-metal interfaces to create enhanced eIPMC sensors for soft, self-powered, high sensitivity strain sensor applications. Through advanced additive manufacturing and minimal physics-based chemoelectromechanical models, the eIPMC sensors demonstrate improved electrochemical properties and compression sensing performance. Alternative fabrication methods such as filament-based fused-deposition manufacturing and stencil printing also show enhanced sensing performance against traditional IPMC sensors.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Mechanical
Jake A. Steiner, Lan N. Pham, Jake J. Abbott, Kam K. Leang
Summary: This article introduces a magnetically actuated soft endoluminal inchworm robot, and demonstrates its locomotion characteristics through a detailed model and physical experiments. By investigating the effects of mechanical properties and design variables, it advances the understanding of this concept of endoluminal robot.
JOURNAL OF MECHANISMS AND ROBOTICS-TRANSACTIONS OF THE ASME
(2022)
Proceedings Paper
Automation & Control Systems
Yuhe Chang, William S. Nagel, Kam K. Leang, Sean B. Andersson
Summary: This paper investigates two control methods for motion tracking of local circular scan trajectories. The first method uses model predictive control and a linear quadratic tracking controller, while the second method uses a discrete linear quadratic controller. Through simulations, it is found that the first method has better tracking performance.
2021 AMERICAN CONTROL CONFERENCE (ACC)
(2021)
Article
Automation & Control Systems
Bart Raeymaekers, Kam K. Leang, Maurizio Porfiri, Shenghan Xu
Summary: The concept of a distributed network of consumer-type 3D printers is proposed to address manufacturing crises, discussing technical challenges and introducing a cyber-infrastructure for autonomous operation and reconfiguration of the network. This network can not only play a role in crisis relief but also establish a virtual marketplace for manufacturing capacity exchange.
ADVANCED INTELLIGENT SYSTEMS
(2021)
Proceedings Paper
Automation & Control Systems
William S. Nagel, Kam K. Leang
2020 AMERICAN CONTROL CONFERENCE (ACC)
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Aleksandra Mitrovic, Kam K. Leang, Garrett M. Clayton
2020 IEEE/ASME INTERNATIONAL CONFERENCE ON ADVANCED INTELLIGENT MECHATRONICS (AIM)
(2020)
Article
Engineering, Biomedical
Lan N. Pham, Jake A. Steiner, Kam K. Leang, Jake J. Abbott
IEEE TRANSACTIONS ON MEDICAL ROBOTICS AND BIONICS
(2020)
Article
Robotics
Dejun Guo, Kam K. Leang
IEEE ROBOTICS AND AUTOMATION LETTERS
(2020)