Article
Engineering, Industrial
G. F. Liu, X. Y. Cui, Z. Z. Li, J. H. Wang, X. D. Zhang, Z. H. Bai
Summary: A three-dimensional finite element model was built to analyze the shape change characteristics during the rolling process of a four-high hot continuous rolling mill. The study found that reasonable tension before and after loading can effectively reduce the stress and rolling pressure required during rolling.
INTERNATIONAL JOURNAL OF SIMULATION MODELLING
(2022)
Article
Engineering, Mechanical
Xing Lu, Jie Sun, Zhen Wei, Guangtao Li, Dianhua Zhang
Summary: This paper introduces a new model to predict the minimum friction coefficient in rolling mills, improving friction balance and designing optimal rolling conditions to expand the stability range of the friction.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Metallurgy & Metallurgical Engineering
Zhi-ying Gao, Bo Tian, Yang Liu, Li-yuan Zhang, Mao-lin Liao
Summary: The study focused on chatter instability in a 5-stand cold tandem rolling mill and successfully suppressed the chatter while improving rolling efficiency through an optimization model, providing valuable insights for intelligent manufacturing of the rolling process.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Automation & Control Systems
Lei Cao, Xu Li, Dianhua Zhang
Summary: This study proposes a new finite element model to investigate the influence of flatness control actuators on mill stability in the cold rolling process. The results show that work roll bending has the greatest impact on the critical speed, followed by intermediate roll shifting and intermediate roll bending. This research contributes to mechanism improvement and chatter suppression in the cold rolling process.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Lei Cao, Xu Li, Qinglong Wang, Dianhua Zhang
Summary: This work discusses the importance of the friction characteristics of rolling interface in rolling stability, introduces a new unsteady lubrication model, develops a dynamic chatter model, analyzes the main process parameters affecting mill stability, and investigates the changes in parameters and tribological characteristics during unstable rolling processes. The conclusion is that the rapid changes in lubrication state and friction stress lead to intensified vibration.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Physical
Honghao Wang, Sheng Ding, Tom Taylor, Jun Yanagimoto
Summary: In this study, an efficient elastic-plastic analysis method was established using the finite element method with zooming analysis to predict metal plate texture after cold rolling. The method was validated through comparison of experimental and simulation results for an S45C plate with a body-centered cubic lattice. The numerical analysis method proposed in this study can serve as an alternative to experimental approaches and contribute to the study of anisotropy.
Article
Automation & Control Systems
Zhen Wei, Qinglong Wang, Jie Sun, Wen Peng, Dianhua Zhang
Summary: A three-dimensional model was established to investigate the edge drop control characteristics of the roll contour on the taper segment of a taper-work roll. The results showed that adjusting the relative position of the roll contour and the work roll effectively reduced edge drop. Increasing the height of the roll contour improved the edge drop control ability, but also increased the uneven rolling pressure and contact pressure between the rolls. Therefore, a novel approach for roll contour evaluation was proposed, and the optimal range for different roll contours was calculated.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Shouvik Ganguly, Xin Wang, K. Chandrashekhara, Mario F. Buchely, Simon Lekakh, Ronald J. O'Malley, Dengqi Bai, Yufeng Wang
Summary: This study develops a 3D finite element model to simulate and analyze the healing of internal voids in hot-rolled steel plate. The results show that through thickness plastic strains within the slab influence void closure, and variation in void size and locations affect the healing possibilities. The effect of thermal history and thermo-mechanical stresses on void closure is also studied.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Engineering, Manufacturing
Eduard Laurentiu Nitu, Daniela Monica Iordache, Claudiu Badulescu
Summary: This study analyzed the influence of the maximum set force and workpiece diameter on the productivity and quality of formed grooves in radial cold-rolling process through numerical simulations. The penetration curve of roller-tools in the material was determined based on experimental research, and optimal conditions for the rolling process were identified through multivariable analysis and efficient process criteria definition.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2022)
Article
Materials Science, Multidisciplinary
Bangshuo Wei, Hongbo Li, Yuchao Wang, Jie Zhang, Ning Kong, Zhang Liu, Bo Liu
Summary: This paper studies the comprehensive control characteristics of quintic Continuously Variable Crown (CVC) technology in a hot rolling production line. By using finite element simulation, an integrated model of rolls and strip is established to analyze the influence of shifting, bending force, and rolling force on strip profile with different strip widths. The results show that positive shifting and positive bending can reduce the quadratic crown and increase the quartic crown, and shifting has a more significant control effect. The control capability of the crown increases with the increase of strip width, and there is a strong coupling relationship between quadratic and quartic crown.
Article
Automation & Control Systems
Tieheng Yuan, Wenquan Sun, Anrui He, Luzhen Chen, Chao Liu, Shengyi Yong
Summary: This paper addresses the issue of quarter waves in the production of cold rolled high strength steel and proposes a BP-MOPSO-based shape optimization model for the 65MN strip produced by the 1720 UCM mill. Simulation results demonstrate that the optimized bending force setting can effectively improve the strip shape and reduce the occurrence of quarter wave shapes.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Chen Liang, Shudong Yu, Yali Ma, Cancan Li, Jiayong Wei
Summary: This paper focuses on predicting regenerative chatter onset conditions in machining stainless steel. By establishing a credible chatter model and simulating the dynamic characteristics of the tool-workpiece system during cutting, the influence of tool geometry and cutting parameters on chatter in machining operations is analyzed.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Chemical
Wangzhe Xia, Fei Zhao, Pai Fang, Mingze An, Junjiang Zhu, Kai Cheng, Minggui Xia
Summary: Magnetic Fe3O4 nanoparticles recycled from rolling oil sludge (ROS) were used as catalysts for 4-nitrophenol (4-NP) reduction. Compared with commercial nano-Fe3O4, the recycled Fe3O4 exhibited excellent 4-NP reduction performance with easy magnetic separation, complete conversion within 270 s, and stable activity after multiple cycles. The unique structure of Fe3O4@C on the surface of recycled Fe3O4 and the accelerated electron transfer on the carbon shell contributed to its superior activity. This study provides a new approach for utilizing ROS waste and synthesizing efficient 4-NP reduction catalysts.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Hongbin Zhang, Wu Zhao, Dan Huang, Chaofan Sun, Junkai Fan
Summary: This article reveals the vibration stability of the cold rolling system under different parameter conditions by establishing a vertical nonlinear vibration model. The results show that parameter changes can cause bifurcation and chaos, and a nonlinear phenomenon of the system is also found. Furthermore, the parameter matching regions for periodic and chaotic motions of the cold rolling system are determined.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Chemical
Pranjal P. Das, Anweshan, Mihir K. Purkait
Summary: The study shows that in treating effluent from the Cold Rolling Mill of Tata Steel Industry in India, the standalone electrocoagulation process is more efficient and cost-effective compared to ozonation. The optimal experimental conditions can reduce pollutant content below discharge limits, with the cost of ozonation process being about six times that of electrocoagulation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biophysics
Benjamin Sackmann, Peter Eberhard, Michael Lauxmann
Summary: Current clinical practice often fails to identify the causes of conductive hearing loss in the middle ear with certainty. In this study, a model is presented to reproduce characteristic changes in middle ear metrics by altering local physical parameters linked to anatomical causes. The fitted model shows promise for model-based diagnosis.
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Multidisciplinary
Ekrem Oezkaya, Andreas Baumann, Sebastian Michel, Dirk Schnabel, Peter Eberhard, Dirk Biermann
Summary: This paper investigates the behavior of cutting fluid in micro-single-lip deep hole drilling, considering chip formation and transient chip position. Digitized chips obtained from experiments are used for simulations. The velocity of the cutting fluid in the chip flute is measured to compare simulations with experiments. Transient coupled particle simulation and Computational Fluid Dynamics simulation are performed to gain insights about the deep hole drilling process.
INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION
(2023)
Article
Mathematics, Interdisciplinary Applications
Elizaveta Shishova, Florian Panzer, Martin Werz, Peter Eberhard
Summary: Friction stir welding(FSW) is a complex joining process which involves multiple physical phenomena such as friction, heat generation, heat conduction, and plastic deformations. Smoothed particle hydrodynamics(SPH) is a mesh-free technique that can handle these challenges by considering the bonding mechanism. This research focuses on a new development related to bonding during FSW to gain a deeper understanding of weld formation.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Mechanics
Lennart Frie, Peter Eberhard
Summary: This paper introduces an algorithm based on Krylov subspaces for moment matching, which iteratively evaluates a series of frequency shifts to find a reduced model that approximates the full model in a subspace with low approximation error. Then, the projection matrix is decomposed with singular value decomposition to retain only the most important directions. This novel approach is extensively studied and applied to an industrial helicopter model in this paper.
MULTIBODY SYSTEM DYNAMICS
(2023)
Article
Engineering, Manufacturing
Chigbogu Ozoegwu, Peter Eberhard
Summary: The aim of this work is to develop closed-form models that combine the properties of analytical and numerical approaches for computing the cutting forces of general-helix cylindrical milling tools. The proposed closed-form modeling approach is shown to be more accurate and convergent than the numerical approach, and it demonstrates higher applicability to both fixed helix angle tools and variable helix tools.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Materials Science, Multidisciplinary
H. Minamoto, R. Seifried, P. Eberhard
Summary: In this study, a concept for the experimental determination of contact force-deformation curves of two colliding spheres is presented. The velocities of the spheres are measured using Laser Doppler Vibrometers (LDVs) as two identical steel spheres collide. Displacements are obtained by integrating the velocity with time, and the accelerations are obtained by differentiating the velocity with time. From these values, the deformation and contact forces can be calculated. Results show that the elastic contact force-deformation curve of two colliding spheres can be obtained with reasonable accuracy using LDVs, and for elasto-plastic spheres, a smaller coefficient of restitution and a force-deformation curve with hysteresis are measured.
EXPERIMENTAL MECHANICS
(2023)
Meeting Abstract
Acoustics
Alexander Brauchler, Pascal Ziegler, Peter Eberhard
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Mechanics
Yulong Gao, Pascal Ziegler, Eva Hartlieb, Carolin Heinemann, Peter Eberhard
Summary: Monitoring the vibration of the painting canvas during transport is challenging due to the narrow structure of the transport crate, lack of an inertial reference, and limitations in attaching sensors to the canvas. This article proposes reproducing the vibrations on a strainer in the laboratory based on measured vibration data obtained during transport. Results show that the vibration reproduction system has sufficient accuracy and stability, providing a reference for evaluating painting transport and assisting art conservators.
Article
Automation & Control Systems
Goesta Stomberg, Henrik Ebel, Timm Faulwasser, Peter Eberhard
Summary: Distributed model predictive control (DMPC) is a flexible and scalable feedback control method for a wide range of systems. This article proposes a cooperative DMPC scheme for formation control of mobile robots, implemented using decentralized optimization algorithms. The combination of alternating direction method of multipliers and decentralized sequential quadratic programming allows for decentralized solving of the underlying optimal control problem with nominal convergence guarantees. Experimental results demonstrate the efficacy of DMPC for formation control and the real-time feasibility of the proposed algorithms.
CONTROL ENGINEERING PRACTICE
(2023)
Article
Robotics
Hannes Eschmann, Henrik Ebel, Peter Eberhard
Summary: This paper proposes an iterative learning-based procedure for highly accurate tracking, using techniques like Gaussian process regression to tailor a motion model based on a specific recurring reference. The approach enables explorative behavior to automatically explore states around the prescribed trajectory, enriching the dataset and improving robustness and practical training accuracy. An optimization-based reference generator balances the trade-off between accurate tracking and exploration by minimizing the posterior variance of the underlying Gaussian process model. While the study focuses on omnidirectional mobile robots, the scheme can be applied to a wide range of mobile robots. Real-world experiments on a custom-built omnidirectional mobile robot validate the effectiveness of this approach, showing that explorative behavior can outperform purely exploitative approaches.
Article
Multidisciplinary Sciences
Alexander Brauchler, Sebastian Gonzalez, Manuel Vierneisel, Pascal Ziegler, Fabio Antonacci, Augusto Sarti, Peter Eberhard
Summary: Musical instrument making is a mysterious form of art, lacking a formula for making a good instrument. Historical examples, such as Stradivari's violins or Torres guitars, serve as models. This article presents a method for matching the vibrational response of guitar top plates made with slightly different materials, which can significantly reduce deviations and pave the way for accurately copying historical instruments.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Chigbogu Ozoegwu, Peter Eberhard
Summary: This study proposes a closed-form solution based on a more realistic 3-dimensional cutting force for the prediction of forced vibrations and surface location errors (SLE) in milling processes. The validity of the model is verified through comparisons with numerical models found in literature.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Optics
Luzia Hahn, Fabian Matter, Peter Eberhard
Summary: In this paper, an approach for integrated optical system simulation is presented, which combines the simulations of elastic multibody systems, thermoelastic finite element analysis, and gradient-index ray tracing. This approach allows for the consideration of transient mechanical motions, elastic deformations, thermally induced refractive index changes, and thermal elastic deformations simultaneously in ray tracing. The calculation of disturbances, data transfer and coupling, and the gradient index ray tracing method are introduced.
JOURNAL OF THE EUROPEAN OPTICAL SOCIETY-RAPID PUBLICATIONS
(2023)
Article
Engineering, Mechanical
Yulong Gao, Pascal Ziegler, Carolin Heinemann, Eva Hartlieb, Peter Eberhard
Summary: In this study, the vibration characteristics of canvas and primed canvas of paintings were experimentally investigated. The modal parameters of dummy paintings were identified and used to reconstruct their eigenmodes. The influence of humidity and temperature on the eigenfrequencies of dummy paintings was also studied.
ARCHIVE OF MECHANICAL ENGINEERING
(2023)
Article
Robotics
Wei Luo, Jingshan Chen, Henrik Ebel, Peter Eberhard
Summary: Planning a time-optimal trajectory for aerial robots is crucial in drone applications like rescue missions and package delivery. This study proposes an optimization framework using discrete mechanics and complementarity constraints to achieve time-optimal pickup of a parcel from a moving mobile robot.
IEEE TRANSACTIONS ON ROBOTICS
(2023)