Article
Automation & Control Systems
Ali Anil Demircali, Rahmetullah Varol, Gizem Aydemir, Eda Nur Saruhan, Kadir Erkan, Huseyin Uvet
Summary: This article introduces an untethered magnetic manipulation technique for controlling micro robot position under high flow rate laminar conditions. The proposed magnetic configuration enhances stability and positioning accuracy of the micro robot, providing a new research direction for the motion of micro robots under high flow conditions.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Mechanics
Priyanka Choudhary, Sujin B. Babu
Summary: This study explores a two-dimensional one-hinge swimmer with non-uniform bending rigidity distribution along its arms, showing higher swimming speed and efficiency. The research also demonstrates the maneuverability of the swimmer with asymmetrical bending rigidity, leading to curved paths, and the control of angular velocity, curvature, and direction of rotation by adjusting the relative bending rigidity of the arms.
Article
Mathematics
Cristina Nuevo-Gallardo, Jose Emilio Traver, Ines Tejado, Blas M. Vinagre
Summary: This study aims to optimize the displacement and efficiency of Purcell's three-link microswimmer, comparing different gaits. Results show that Tam and Hosoi's optimal velocity gait achieves the highest displacement and best energy consumption efficiency in the low Reynolds number regime. The conclusions can help designers select the optimal swimmer geometry and motion method for trajectory tracking based on desired control objectives.
Article
Mechanics
Lei Dong, Kwing-So Choi, Yaxing Wang
Summary: In this study, the flow control of the tip vortices over a very low aspect-ratio wing was performed using dielectric-barrier-discharge plasma actuators. The results showed that plasma flow control led to significant changes in the aerodynamic forces, with the lift coefficient increasing by 23% and decreasing by 30% with the blowing and suction plasma actuators, respectively. The drag coefficient only experienced a minor change of less than 10%. The blowing plasma actuator moved the tip vortices away from the wing tip, increasing the streamwise vorticity, turbulence intensities, and Reynolds stress. On the other hand, the suction plasma actuator shifted the tip vortices closer to the wing tip. The blowing plasma increased the tip vortex circulation, while the counter-flowing suction plasma reduced it.
Article
Engineering, Aerospace
Shreyas Narsipur, Ashok Gopalarathnam, Jack R. Edwards
Summary: This study develops a physics-based low-order model to simulate the interactions between two flow phenomena in airfoil dynamic stall, and predicts it with only a few empirical parameters. The model shows excellent performance in aerodynamic loads and flow pattern predictions compared to computational and experimental results, and provides valuable insights into the flow physics of unsteady airfoils.
Article
Robotics
Ali Nickandish, Hossein Nejat Pishkenari
Summary: A new low-Reynolds-number microrobot with high 3D maneuverability has been introduced in this study, along with a cascade optimal control technique to control the swimmer trajectory, achieving exponential stability on the system trajectory error and minimum fluctuations of control signals.
Article
Automation & Control Systems
Sudin Kadam, Karmvir Singh Phogat, Ravi N. Banavar, Debasish Chatterjee
Summary: In this article, we address the problem of discrete-time isoholonomic motion in a planar Purcell's swimmer system and provide a solution using the discrete-time Pontryagin's maximum principle. We derive a discrete kinematic model of the system based on a local form of a discrete connection and apply an adapted version of the discrete maximum principle on matrix Lie groups to obtain the necessary optimality conditions. These conditions are solved numerically as a two-point boundary value problem. Numerical experiments are conducted to demonstrate the effectiveness of the algorithm and compare it with existing results.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2022)
Article
Green & Sustainable Science & Technology
Joseph Rendall, Ahmad Abu-Heiba, Kyle Gluesenkamp, Kashif Nawaz, William Worek, Ahmed Elatar
Summary: Studies on thermally stratified storage tanks have been conducted for over 50 years to improve thermal storage efficiency and predict outlet temperature accurately, focusing on flow phenomena, instabilities, and numerical models. Mixing in these tanks is driven by Kelvin-Helmholtz and Rayleigh-Taylor instabilities, with the combination of Reynolds and convection numbers used for accurate one-dimensional modeling.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Robotics
Alireza Esfandbod, Hossein Nejat Pishkenari, Ali Meghdari
Summary: The study introduces a novel three-dimensional micro-scale robot capable of swimming in low Reynolds number. The robot is controlled by a method that allows it to achieve desired position and orientation in low Reynolds number flow. Simulation results confirm the successful performance of the robot mechanism and control method, showing high maneuverability of the microrobot.
Article
Mathematics, Interdisciplinary Applications
Xinjie Fu, JinRong Wang
Summary: We developed a complex network-based model for infectious diseases and analyzed its stability. The results show that when considering three control measures including isolation and vaccination, the scale and cost of the disease are minimized.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Robotics
Michael F. Reynolds, Alejandro J. Cortese, Qingkun Liu, Zhangqi Zheng, Wei Wang, Samantha L. Norris, Sunwoo Lee, Marc Z. Miskin, Alyosha C. Molnar, Itai Cohen, Paul L. McEuen
Summary: This study develops an integration process and builds microscopic robots controlled by complementary metal oxide semiconductor electronics. These robots, sized from 100 to 250 micrometers, are powered by light and can respond to optical commands. This work lays the foundation for the development of future autonomous microscopic robots.
Article
Engineering, Multidisciplinary
Mansoor Jadidi, Michael J. Simmonds, Abdolrahman Dadvand, Geoff Tansley
Summary: The relaxation time is crucial for the accuracy of simulation in the lattice Boltzmann method (LBM). However, there is limited research on evaluating the optimal relaxation time. This paper proposes a systematic approach to determine the optimal relaxation time, specifically for low Reynolds (Re) number flows resembling blood flow in micro-vessels. The LBM with D2Q9 lattice model is used to simulate Poiseuille flow in a micro-channel and its accuracy is compared to the analytical solution. It is found that the analytically predicted optimal relaxation time differs from the numerical solution, suggesting the need for correction when using analytical relaxation time in LBM code.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mechanics
You Wu, Yating Hu, Yuting Dai, Guangjing Huang, Chao Yang
Summary: This paper investigates the influence of spanwise-distributed trailing edge camber morphing on the dynamic stall characteristics of a finite-span wing. It is found that the trailing edge deformation can change the aerodynamic and energy transfer characteristics of the dynamic stall, and has the potential to suppress stall flutter.
Article
Multidisciplinary Sciences
Endao Han, Lailai Zhu, Joshua W. Shaevitz, Howard A. Stone
Summary: In this study, a biflagellated sphere at low Reynolds number is propelled using uniform and static electric fields via Quincke rotation. The Quincke swimmers exhibit three different forms of motion, including a self-oscillatory state due to elastohydrodynamic-electrohydrodynamic interactions. Each form of motion follows a distinct trajectory in space, demonstrating a potential method to control the locomotion of artificial flagellated swimmers.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Mechanics
N. Hosseini, M. Tadjfar, A. Abba
Summary: In this study, active flow control was used to improve the aerodynamic performance of a tandem configuration of two SD7003 airfoils. Synthetic jet actuators were applied on both airfoils to control the low Reynolds number flow fields. An optimization algorithm coupled with machine learning reduced computational cost. Results showed that adjusting design variables significantly improved the aerodynamic performance, resulting in a 304% increase in the total lift-to-drag ratio.
Article
Materials Science, Multidisciplinary
Seyed Amin Moravej, Ali Taghibakhshi, Hossein Nejat Pishkenari, Jamal Arghavani
Summary: Shape memory alloys are a group of alloys that can recover permanent deformation and strain, with studies using molecular dynamics simulation methods to investigate their behavior under cyclic loading instead of traditional Continuum Mechanics. The results of the study contribute to a better understanding of the behavior of memory alloys under cyclic loading.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2022)
Article
Acoustics
Mohammadreza Sajjadi, Mahmood Chahari, Hossein N. Pishkenari, Gholamreza Vossoughi
Summary: This study proposes a nonlinear observer for high-speed estimation of sample surface topography using transient oscillation of a microcantilever, and demonstrates the feasibility of accurately estimating different sample heights with a relatively high scanning speed. The stability of the observer and controller is verified using the Lyapunov stability theorem, eliminating the need for model linearization.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Engineering, Aerospace
Ali Mehrparwar Zinjanabi, Hossein Nejat Pishkenari, Hassan Salarieh, Taleb Abdollahi
Summary: The failure of mechanical components in satellites, particularly the satellite attitude control system, is a common phenomenon. Existing studies on controlling underactuated satellites often assume a diagonal inertia matrix and do not consider limitations on torque applied by reaction wheels. This paper proposes a method that utilizes motion planning to control satellites, taking into account non-diagonal inertia matrix and limited torque. The method also considers the effect of disturbances on the controlled satellite and customizes the approach for tracking objects in space.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Meysam Jokar, Hassan Salarieh, Hossein Nejat Pishkenari
Summary: This study addresses the attitude control of a liquid propellant-filled satellite considering the effects of fuel sloshing. A PDE-based controller is proposed to achieve satellite attitude control and suppress fuel sloshing. The derived coupled equations using Hamilton's principle are used to analyze the stability of the closed-loop system. The evaluation of the proposed controller demonstrates its significance in achieving more accurate satellite attitude maneuvers.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Mohammadreza Sajjadi, Mahmood Chahari, Hossein Nejat Pishkenari
Summary: This study investigates the limitations and influence of various factors on the performance of trolling mode atomic force microscopy (TR-AFM). Simulation tools and imaging experiments are used to analyze the effects of factors such as the flexibility of the nanoneedle, bistability response, nonlinearity, and vertical displacement on image quality.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Mehran Vaezi, Hossein Nejat Pishkenari, Alireza Nemati
Summary: Nanocars are nanovehicles proposed for transporting nanomaterials on surfaces. The study of their motion mechanism has attracted interest due to the potential of these vehicles in constructing nanostructures using a bottom-up approach. Molecular dynamics simulations were used to investigate the motion of Nanocar and Nanotruck on a hexagonal boron-nitride monolayer. The results show that boron-nitride provides higher mobility for nanocars compared to metal substrates and that long-range motions occur at temperatures of 400 K and above. The flexibility of the Nanocar chassis reduces its displacement range and the translations of the nanocars commonly occur through sliding rather than wheel rolling. The results of this study are expected to contribute to the fabrication of nanostructures using molecular machines.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Engineering, Mechanical
Mohammad Kianezhad, Mehrdad Youzi, Mehran Vaezi, Hossein Nejat Pishkenari
Summary: This paper investigates the motion characteristics of carbon nanotubes (CNTs) as wheels for nanocars on a gold substrate. The results show that CNTs have directed motion, making them an ideal option for nanocar wheels. The motion characteristics are influenced by chirality, diameter, temperature, and length. Chirality and length have a significant impact on the directionality of motion. Comparing with C60 and p-carborane molecules, CNTs exhibit more directed motion.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Automation & Control Systems
Ruhollah Khalesi, Masoud Yousefi, Hossein Nejat Pishkenari, Gholamreza Vossoughi
Summary: This paper proposes a system for simultaneous control of multiple microrobot positions and utilizes a sliding mode controller to eliminate the effects of disturbances and uncertainties. The performance of the system is demonstrated through simulation and experimental tests.
Article
Engineering, Mechanical
Javad Azadbakht, Hossein Nejat Pishkenari
Summary: This study develops surface-enhanced continuum models to predict the vibrational properties of nanoplates. By using a composite core-shell modeling scheme and molecular dynamics simulations, continuum model parameters are obtained based on the surface effects. Calibrated continuum models accurately predict the vibrational behavior of ultrathin silicon nanoplates and offer an effective tool for capturing higher natural frequencies in nanomechanical resonators.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Mehran Vaezi, Hossein Nejat Pishkenari, Mohammad Reza Ejtehadi
Summary: We evaluated the motion of fullerene as a nanocar wheel on graphene nanoribbons with strain gradients using molecular dynamics and theoretical approaches. The results showed that the motion of the fullerene became more directed and the driving force and diffusion coefficient increased with the increase of strain gradient. By applying successive strain gradients in perpendicular directions, we successfully steered the motion of the fullerene to desired target locations.
Article
Robotics
Masoud Yousefi, Mohamad Jamshidian Ghaleshahi, Hossein Nejat Pishkenari, Aria Alasty
Summary: This paper proposes an optimization-based method to simultaneously estimate the shape and forces acting on a continuum robot. The method utilizes magnetic localization to determine the position of multiple points on the robot and is capable of estimating the robot's shape and force in various conditions. Experimental results show high accuracy of the proposed method.
INTELLIGENT SERVICE ROBOTICS
(2023)
Article
Chemistry, Physical
Mehrdad Youzi, Mohammad Kianezhad, Mehran Vaezi, Hossein Nejat Pishkenari
Summary: This study investigates the motion of C-60 and C-60-based nanovehicles on the silicene monolayer using molecular dynamics simulations. The results show that compared to graphene and hexagonal boron-nitride, the energy barrier on silicene is higher, resulting in lower diffusion coefficient and higher activation energy for C-60 and nanomachines. The motion of the nanovehicles is limited by a nanoroad structure and can be controlled by applying a thermal gradient to the surface.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Mehran Vaezi, Hossein Nejat Pishkenari, Mohammad Reza Ejtehadi
Summary: The study examines the motion of nanocar clusters on graphene surfaces, showing that sliding movements are the dominant mode in thermally activated surface motion. Changes in cluster properties at different temperatures are analyzed through simulations. As the number of nanocars in a cluster increases, the motion regime shifts from long-range to small-range displacements, exhibiting a variety of motion patterns.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Mehran Vaezi, Hossein Nejat Pishkenari, Mohammad Reza Ejtehadi
Summary: Understanding the motion characteristics of fullerene clusters on the graphene surface is crucial for designing surface manipulation systems. The study reveals that surface mobility decreases with an increase in the number of fullerenes, and separation of fullerenes occurs at higher temperatures. Additionally, multilayer fullerene clusters tend to locate on the graphene surface.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
