Article
Computer Science, Artificial Intelligence
Sh. Chen, Yu. M. Zabolotnov
Summary: This study investigates the process of forming a rotating constellation of microsatellites in the shape of a regular triangle connected by tethers. A combined control method using tether tension control and thrusters for deployment is proposed. Two models are used to demonstrate the feasibility of the control method. The first model constructs a nominal group formation program, treating microsatellites as mass points and tethers as inextensible mechanical bonds. The second model accounts for the extensibility of tethers, simulates cable release mechanisms, and considers the motion of microsatellites relative to their centers of mass. Numerical calculations confirm the potential of the proposed control method for forming a tethered constellation rotating at a constant angular velocity.
JOURNAL OF COMPUTER AND SYSTEMS SCIENCES INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ang Xiao, Changqing Huang, Ziqin Yan, Xiaohui Cui, Shipeng Wang
Summary: The study shows that the use of electrically assisted electromagnetic forming can significantly increase the forming limits and elongation of 7075 aluminum alloy while reducing yield strength and tensile strength, as well as decreasing grain size and texture strength.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Civil
Ziqin Yan, Ang Xiao, Peng Zhao, Xiaohui Cui, Xiaoming Sun, Zanshi Deng
Summary: Hydroforming is a process widely used in the automotive and aviation fields for precisely controlling the shape of complex parts. However, it has limitations in improving the plastic deformation property of materials due to its low-strain rate nature. Electromagnetic forming, on the other hand, is a high-speed forming method that can significantly increase the material-forming limit, but lacks shape-control ability for complex parts. This study proposes an electromagnetic hydraulic forming process, which improves the forming accuracy and plastic deformation capacity of materials.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Engineering, Aerospace
Chuang Liu, Xiaokui Yue, Jianqiao Zhang, Keke Shi
Summary: An active disturbance rejection control (ADRC) scheme is proposed for electromagnetic docking of spacecraft to handle time-varying delay, fault signals, external disturbances, and elliptical eccentricity. By introducing an intermediate observer (IO) and an auxiliary variable, the relative motion information and total disturbance can be estimated. The proposed ADRC scheme ensures convergence of relative position, relative velocity, and estimation errors. It has advantages in accuracy, robustness, and requirement of no prior knowledge.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2022)
Article
Automation & Control Systems
Peng Zhao, Ziqin Yan, Xiaohui Cui
Summary: This paper proposes a new sheet forming method called EMHF that combines EMF with hydraulic forming. Finite element models were used to analyze the deformation of 5052 aluminum alloy during both EMF and EMHF processes. Experimental results verified the simulation results and demonstrated the effectiveness of EMHF.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ang Xiao, Changqing Huang, HongSheng Liu, Xiaohui Cui, Shipeng Wang
Summary: Electrically assisted electromagnetic forming technology can improve the plastic deformation ability of 5052 aluminum alloy, increase the elongation of the formed sample, and induce microstructural changes.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Automation & Control Systems
Wenzhen Xia, Xiaohui Cui, Zhihao Du, Zanshi Deng, Yuhong Lin
Summary: Two forming processes using electromagnetic forming (EMF) were designed to control springback after sheet stamping. Simulation and experiment results show that increasing discharge voltage can reduce the springback angle of the sheet metal.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Zhengcheng Long, Hongsheng Liu, Ziqin Yan, Xiaohui Cui
Summary: In this study, a flat spiral coil is used for the micro-forming of thin sheet metal, and the effects of discharge voltage, cushion block thickness, and number of discharge times on sheet forming quality are analyzed. The results show that increasing discharge voltage and using successive discharges can improve moldability.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Zhi Li, A. Abu-Siada, Hongyu Zhu, Chenfei Jiang, Hanwen Ni, Li Qiu, Hongchi Liu
Summary: The paper proposes a double tube-task electromagnetic forming technology method to achieve tube compression and expansion simultaneously, improving forming efficiency significantly.
Article
Automation & Control Systems
Ziqin Yan, Zhihao Du, Xiaohui Cui, Changqing Huang, Yimin Meng
Summary: This study investigated the effects of electromagnetic direct forming, electromagnetic drive forming, and traditional stamping on high-strength aluminum alloy sheets. It was found that while both electromagnetic direct forming and traditional stamping resulted in significant springback, electromagnetic drive forming was effective in reducing springback and enhancing deformation uniformity.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Optics
Mohammadbagher Mohammadnezhad, Sarkew Salah Abdulkareem, Abdollah Hassanzadeh
Summary: This paper proposes and investigates a simple and effective optical tweezer setup that utilizes the interference of two counter propagating Bessel beams. The potential energy of particles in the generated spiral patterns is evaluated numerically and analytically, and it is found that the patterns can be rotated by introducing a phase difference between the beams.
Article
Automation & Control Systems
Manoj Soni, Meraj Ahmed, Sanjay Kumar Panthi, Surendra Kumar, Khushwant Singh Gavel
Summary: The study analyzed the impact of structural parameters of compression coil on system performance through experimental and numerical simulation, finding that the effective turn (n) has a greater significance in the performance of the compression coil compared to the cross-section (X) and pitch circular diameter (PCD) of the coil.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Jhonathan O. Murcia Pineros, Rodolpho Vilhena de Moraes, Antonio F. Bertachini de Almeida Prado
Summary: This paper discusses the application of Gravity Assisted Maneuvers in space missions, including the advantages and limitations of Gravity-Assist and Aero-gravity Assist, as well as the effects of implementing Aero-gravity Assisted maneuvers with low Lift-to-Drag ratios. The study found that Aero-gravity Assisted maneuvers can achieve significant energy gains on Venus and Mars.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Engineering, Mechanical
Mojtaba Eftekhari, Malihe Eftekhari, Asghar Dashti Rahmatabadi
Summary: This paper investigates the stability of the fixed points of a flexible rotor supported by journal bearings through Bifurcation diagrams. The effects of various factors on the stability of the rotor are considered, including nonlinearity in curvature and inertia, mass eccentricity, hydrodynamic forces of the journal bearings, and nonlinear electromagnetic harmonic force. The study reveals that under the influence of nonlinearity, the rotor may exhibit periodic, quasi-periodic, and chaotic motions.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART K-JOURNAL OF MULTI-BODY DYNAMICS
(2021)
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
