Article
Engineering, Mechanical
Wilfried Sokamte Takam, Alexandre Mando Kongne, David Yemele
Summary: This article investigates the static stability and dynamical behavior of active magnetic bearings made of n arbitrary pairs of electromagnet coils (PEC). Nonlinear equations governing the dynamics of the rotor-shaft are derived and a stability state diagram for the generalized model is established. This diagram is crucial for designing AMBs and determining optimal operating conditions.
NONLINEAR DYNAMICS
(2023)
Article
Computer Science, Hardware & Architecture
Zeng-Jun Xin, Qiang Lai
Summary: This paper is devoted to constructing a simple and meaningful memristive chaotic system that has one equilibrium but has multi-parameter amplitude modulation and large-scale offset boosting. The evolution process of system dynamics under the influence of parameters is shown based on bifurcation diagrams and Lyapunov exponents. Consistent results with numerical simulations are observed in circuit experiments, which demonstrates the existence and practicability of the memristive chaotic system.
INTEGRATION-THE VLSI JOURNAL
(2023)
Article
Engineering, Mechanical
Nitin Agrawal, Satish C. Sharma
Summary: Recent tribology research has focused on using engineered grooved surfaces to improve lubrication performance in tribo-contacts. This paper presents a study on the performance of micro-grooved hole-entry hybrid spherical thrust bearings, considering the non-Newtonian behavior of the lubricant. The findings show that the presence of micro-grooves on the bearing surface enhances its performance and the specific geometry of the micro-groove has an impact on the performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Adesh Kumar Tomar, Satish C. Sharma
Summary: The present study numerically analyzed the synergistic effect of recess shapes and non-linear behavior of the lubricant on 4-pocket hybrid multi-recess spherical journal bearings. The results demonstrated that the recess shapes and non-linear factor significantly affected bearing performance, and the proper selection of these factors is necessary for enhanced performance.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Computer Science, Interdisciplinary Applications
Changjin Xu, Zixin Liu, Maoxin Liao, Peiluan Li, Qimei Xiao, Shuai Yuan
Summary: This article focuses on the stability and Hopf bifurcation of fractional-order BAM neural networks with multiple delays, and finds that delays have a significant impact on their stability and bifurcation.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2021)
Article
Engineering, Mechanical
Yunlei Wang, Jiu Hui Wu, Lushuai Xu
Summary: This paper investigates the impact of lubricant's non-Newtonian property on the dynamic characteristics of spiral groove liquid film seal. The results demonstrate that the non-Newtonian property should be taken into account in the design of liquid film seal.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Computer Science, Interdisciplinary Applications
Changjin Xu, Dan Mu, Yuanlu Pan, Chaouki Aouiti, Yicheng Pang, Lingyun Yao
Summary: This paper mainly investigates the stability and existence of Hopf bifurcation in fractional-order BAM neural networks with multiple delays. A new criterion is established based on Laplace transform, stability criterion, and Hopf bifurcation theory of fractional-order differential equations to ensure the stability and existence of Hopf bifurcation in the networks. The study reveals the significant role of time delay in maintaining network stability and controlling the occurrence of Hopf bifurcation in fractional-order BAM neural networks. Numerical simulations are conducted to validate the analytical conclusions.
JOURNAL OF COMPUTATIONAL SCIENCE
(2022)
Article
Mathematics, Applied
Changjin Xu, Wei Zhang, Chaouki Aouiti, Zixin Liu, Maoxin Liao, Peiluan Li
Summary: This work investigates the stability, existence, and control of Hopf bifurcation in a newly established fractional-order delayed bidirectional associative memory (BAM) neural network with four neurons. By setting up a new neural network model, utilizing stability theory and bifurcation knowledge of fractional-order differential dynamical systems, and designing a suitable controller, the study shows that time delay has a significant impact on the stability and bifurcation of the network model.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Rongpeng Wang, Xiaoqin Liu, Guiqiu Song, Shihua Zhou
Summary: The research investigates the non-linear dynamics of the drill string system model considering fluid-structure coupling and support stiffness, and analyzes the effects of various parameters on the dynamic characteristics. Different dynamic model behaviors, such as periodic motion and chaotic motion, are observed under different parameter excitations. Support stiffness significantly influences the dynamic response of the drill string system.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Artificial Intelligence
Changjin Xu, Wei Zhang, Zixin Liu, Peiluan Li, Lingyun Yao
Summary: This article investigates the stability and Hopf bifurcation behavior of fractional-order three-layer neural networks with multiple time delays. Variable substitution, Laplace transform, and computer simulation techniques are employed. The study establishes stability criteria and conditions for Hopf bifurcation. The research highlights the significance of delay in stabilizing the system and controlling bifurcation behavior.
COGNITIVE COMPUTATION
(2022)
Article
Physics, Mathematical
David Fajman, Todd A. Oliynyk, Zoe Wyatt
Summary: The study focuses on the global regularity and stability of the relativistic Euler equations with a state equation, for small initial data in expanding spacetime. The result suggests that the Universe's decelerating expansion phase is necessary for structure formation in cosmological evolution.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2021)
Article
Thermodynamics
Dong Li, Matthias Ihme
Summary: This study investigates the stability limits and physical mechanisms of flame blow-out in non-premixed combustion through theoretical analysis and numerical simulations. Stability conditions are derived by applying expressions for fuel/air equivalence ratio and strain rate to diffusion flames. Experimental data and large-eddy simulations verify the stability limits, showing good agreement with theoretical predictions.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Mathematics, Interdisciplinary Applications
Zeyi Liu, Xiaobo Rao, Jianshe Gao, Shunliang Ding
Summary: This paper presents a systematic investigation of the dynamic complexities exhibited by a driven double pendulum system. It explores a wide range of novel dynamical behaviors and uncovers various unique self-organizations. The observed chiral structures challenge the notion that ring structures are necessary for their emergence. Furthermore, the study reports the experimental observation of a newly generated parabolic phase near the quint point, validating the phenomena observed through numerical calculations in experiments.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Engineering, Mechanical
Tewfik Sari, Boumediene Benyahia
Summary: The AM2 model is a simple anaerobic digestion model that captures the main dynamical behavior and has advantage of complete analysis for the existence and local stability of its steady states. The operating diagram is very helpful to understand the model from both mathematical and biological perspectives. Six types of behavior can be observed in the long-term dynamics of the AM2 model.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Dan Wang, Zhifeng Hao, Ekaterina Pavlovskaia, Marian Wiercigroch
Summary: A low-dimensional model is proposed to study a top-tensioned riser under excitations from vortices and time-varying tension. The system is described by governing partial differential equations and multi-mode approximations are obtained using the Galerkin projection method. The study investigates different resonances and bifurcations under varying parameters, providing insights on system stability and behavior.
NONLINEAR DYNAMICS
(2021)
Article
Materials Science, Multidisciplinary
Priyanka Singh, Nathi Ram Chauhan, S. Rajesha
MATERIALS RESEARCH EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Aasiya Parveen, Nathi Ram Chauhan, Mohd Suhaib
Summary: Aluminium hybrid composites (AHCs) were developed in this study using powder metallurgy method, with varying weight percentages of Si3N4 and ZrO2 reinforcements. The SEM results showed uniform distribution of reinforcement and matrix particles, with accumulation of nano-size ZrO2 particles. With increasing compaction pressure and weight percentages of reinforcements, density and micro-hardness improved while porosity decreased. The highest hardness value was found to be 72 VHN for sample E at 500 MPa.
ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES
(2022)
Article
Metallurgy & Metallurgical Engineering
A. Parveen, N. R. Chauhan, M. Suhaib
Summary: In this study, aluminum hybrid composites were developed through powder metallurgy using Si3N4 and ZrO2 as reinforcements. The impact of milling time and reinforcement weight percentage on microstructure, density, and hardness was investigated. The results showed that homogeneous mixing of reinforcements with the matrix and reduction of clusters were observed with increased milling time, leading to increased density and hardness of the composites.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Materials Science, Multidisciplinary
Sakshi Singh, Nathi Ram Chauhan
Summary: This study investigates the wear behavior and parameters of B4C/AZ91DMg metal matrix composites prepared by a vacuum-based stir casting process. The results show the uniform dispersion of B4C in the composites and the occurrence of severe delamination under high load conditions. Statistical analysis reveals that load has the greatest influence on wear rate, followed by distance and velocity.
ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES
(2022)
Article
Engineering, Mechanical
Krishnkant Sahu, Satish C. Sharma, Nathi Ram
Summary: Misalignment affects the operation of the journal bearing system, and smart lubricants can enhance the performance of fluid film bearings. The study finds that journal misalignment reduces the fluid film thickness, increases the fluid film damping coefficient, and frictional torque.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Mohd Azmal Hussain, Aasiya Parveen, Nathi Ram Chauhan, Mohd Suhaib, Mohammad Waseem
Summary: This study investigates the wear behavior of aluminium hybrid composites developed through powder metallurgy. The effects of reinforcement content, compaction pressure, and applied load on wear results were analyzed. The study utilized Analysis of variance (ANOVA) and artificial neural network (ANN) for wear loss prediction, finding that load is the most influential parameter followed by reinforcement and compaction pressure.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Proceedings Paper
Engineering, Mechanical
Payal Sharma, Nathi Ram Chauhan, Manish Saraswat
RECENT TRENDS IN THERMAL ENGINEERING, ICCEMME 2021
(2022)
Article
Engineering, Multidisciplinary
Aasiya Parveen, Nathi Ram Chauhan, Mohammad Waseem, Mohd Suhaib
Summary: This study developed a composite material Al/3 wt% Si3N4/4.5 wt% ZrO2 using powder metallurgy process and designed a connecting rod for TVS Apache 150 motor engine specifications using Solidworks software. The finite element method analysis in ANSYS Workbench showed a significant reduction in von-Mises stress for the developed composite material compared to existing composite materials.
ENGINEERING RESEARCH EXPRESS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Saxena Neha Deepak, Chauhan Nathi Ram
Summary: This study investigates the effect of nanoparticles on traditional lubricant SAE 20 W40 and Virgin Coconut Oil (VCO), exploring the physio-chemical properties of both oils with TiO2 nanoadditives. The research aims to develop new nanolubricants with enhanced properties, offering potential benefits for machinery performance and durability.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Priyanka Singh, Nathi Ram Chauhan, S. Rajesha
Summary: This paper discusses the design and fabrication of a mini ball miller for grinding materials into nano form in a short period of time, and experiments were conducted to study the effect of milling speed and time on the microstructural bonding of Alumina/SiC composite.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Sakshi Singh, Nathi Ram Chauhan
Summary: In this study, the weight of an aircraft frame structure is optimized using a variable density method. A probabilistic Mg-based composite aircraft frame model is designed and iterated in Ansys software based on its topological properties, resulting in a significantly reduced density and weight percentage. The optimized structure demonstrates a decrease in both density and weight compared to domestic aircraft frames.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Engineering, Industrial
Nathi Ram
RECENT ADVANCES IN MECHANICAL INFRASTRUCTURE ( ICRAM 2019)
(2020)
Article
Engineering, Electrical & Electronic
Samta Shastri, Yusuf Parvez, Nathi R. Chauhan
INTERNATIONAL JOURNAL OF POWER AND ENERGY SYSTEMS
(2020)
Article
Engineering, Multidisciplinary
Manish Saraswat, Nathi Ram Chauhan
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2020)
Article
Engineering, Mechanical
Huiyi Yang, Yang Xu, Chao Xu
Summary: This study focuses on the impact of dry friction interfaces on the dynamics of jointed structures, particularly on the statistics of contact pressure distribution. Through experimental and simulation analysis, it is found that surface roughness and contact load have significant effects on contact area, contact stiffness, and mean contact pressure.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Guanglan Hu, Houfu Dai
Summary: The effect of metal coating on the machinability of cubic silicon carbide was investigated using molecular dynamics simulation. The results showed that the type of coating has a significant impact on cutting force, surface morphology, stress, and tool wear. Among the three metals studied, Cu coating had the greatest impact on improving cutting performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yunfan Liu, Guozheng Ma, Lina Zhu, Cuihong Han, Zhen Li, Bin Zhang, Haichao Zhao, Haidou Wang, Shuying Chen
Summary: The service performance of coated self-lubricating spherical plain bearings can be improved by applying self-lubricating coatings, especially double-sided coatings. The presence of a large-area and complete mixed friction transfer film on the contact surfaces can cause a signal downstage before the signal mutation stage.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yakup Artun, C. Oktay Azeloglu, Gokhan Taylan
Summary: This article investigates the tribological properties of polymer journal bearings, particularly focusing on radial journal bearings made from UHMWPE and POM materials with different surface qualities. The study examines the performance of these bearings under varying load and speed conditions, and analyzes the relationship between material and surface roughness in tribological performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
