Field Of Mechanical Engineering Research Articles

Monoreactive multimass oscillator of non-fixed frequency

Introduction. The work relates to the field of mechanical engineering, namely to oscillating mechanical systems. The relevance of the study is determined by the fact that vibrations of inertial masses occur everywhere.Target. Development of a mathematical model of a monoreactive multimass oscillator of non-fixed frequency.Research methods. It is proved that the points that are the coordinates of the end of an arbitrary vector in the coordinate system are the vertices of a regular polygon. The shape and dimensions of the polygon are not related to the coordinates of the vector, i.e. unchangeable. The center of a regular polygon in all cases coincides with the middle of the vector. In the considered (idealized) case, the polygon, at the vertices of which oscillating loads of masses m are located, lies in the Z plane. In technical applications, the loads should not interfere with each others movements, therefore, each load should have its own plane, and all planes should be parallel (like multi-piston mechanism).Results. The condition for the occurrence of free harmonic oscillations is the equality to zero of the total energy of the system, which in the case under consideration is exclusively kinetic, which determines the monoreactive nature of the oscillator. In the considered multidimensional flat monoreactive oscillator, free harmonic linear oscillations of weights can occur.Conclusion. Only kinetic energy is involved in energy exchange. There is no need for elastic elements. The oscillator does not have a fixed natural frequency of oscillation. The frequency depends on the initial speeds and positions of the weights. A regular polygon undergoes a double rotation - around point 0 and around point r. At the same time, the loads carry out linear harmonic oscillations with amplitude . The use of a crank-slider or crank-rod mechanism will allow for parallel movement of loads.

Preface

With great and successful prestigious history of MAEIE, the 2023 3rd International Conference on Mechanical Automation and Electronic Information Engineering (MAEIE 2023) was held in Nanjing, China during 15th to 17th, December 2023 via virtual format, gathering together about 100 delegates from all over the world.MAEIE 2023 is a great academic platform and is of great significance for disseminating cutting-edge information in disciplines and industry, promoting the transformation of scientific and technological achievements, and condensing academic achievements in the industry at this event.The Conference consisted of 3 plenary keynote speeches addressed by well-known scholars internationally (by Prof. Xiaofang Yuan from Hunan University, China, Assoc. Prof. He Chen from Hebei University of Technology, China, Prof. Aniruddha Bhattacharjya from SGT University, India, respectively), 8 oral and 18 poster presentations, in which a wide range of topics were covered and the most recent significant results were presented. They discussed such topics as Research on Three-dimensional Path Planning Methods for Autonomous Vehicles, Control Research for Underactuated Cranes with State Constraints, Use of Blockchain Technology in IoT Maintaining Cia Triad in Data Communication, among others. Besides, the attending scholars, experts, and researchers exchanged deeply on the latest research achievements and advanced experience in the industry development and shared their unique insights into development trends and research directions of the industry.MAEIE 2023 received submissions from home and abroad, but unfortunately some manuscripts did not pass the final review, which therefore doesn’t appear in this Conference Proceedings. The selected works included in the Proceedings are published in Journal of Physics: Conference Series, covering topics on Automated Instrumentation and Equipment, Molding Manufacturing and Automation, Intelligent Manufacturing Technology, Power Electronics Technology, Electronics and Communication Engineering, among others. They show readers the latest research results and application cases of mechanical automation and electronic information engineering. We firmly believe that by reading these papers, readers will deepen their understanding of these fields and appreciate their enormous significance and potential impact on contemporary society.We wish to acknowledge all the participants, and the support of our sponsors. We would also like to take this opportunity to thank the committee members, as well as the expert reviewers, for their endeavor in making the Conference possible and reviewing the manuscripts submitted. What’s more, we hope that the conference series MAEIE shall continue to the next many sessions and deliver its purpose as the arena for presenting and exchanging the ideas of research in the fields of mechanical automation and electronic information engineering and anything related.The Committee of MAEIE 2023List of Committee Member is available in this pdf.

Experimental substantiation of the technology for manufacturing composite parts based on a viscous metal-polymer

ABSTRACT The article deals with an experimental study of the technological process of obtaining a composite ABS, a metal-polymer part. As the title implies the article describes a method and device for the manufacture of composite parts based on the method of vacuum suction of a viscous metal-polymer into a shell form. Recommendations are given on the technological modes of filling the mould, taking into account the presence of vibration in the process of filling the mould with a metal-polymer, as well as the Reynolds number parameter for establishing a laminar flow of the metal-polymer in the technological mould cavities. The study of the strength of the designed composite part has been carried out using the finite element method of the APM FEM module. The calculations of the strength and stiffness of parts made of ABS, metal-polymer and metal make it possible to compare the strength characteristics of parts made by various methods. Relevant recommendations are given on the use of a composite part reinforced with a metal-polymer in the field of mechanical engineering.

Shock-induced deflagration-enhanced characteristics of Cu-PTFE/Al tandem EFPs impacting multi-layer spaced plates

Polytetrafluoroethylene/aluminum (PTFE/Al) reactive material is a pivotal research object in the aerospace, military, and mechanical engineering fields and can release chemical energy (CE) under shock or impact. However, its relatively low mechanical strength limits its applications. The present paper proposes a Cu-PTFE/Al (73.5wt. %/26.5wt. %) double-layer liner that can form tandem explosive formed projectiles (EFPs) under the shock of shaped charges, which not only retains the strong penetration ability but also shows a more significant lateral enhancement effect through the deflagration reaction. Here, the preparation process of the PTFE/Al liner is given, and an analytical model for the Cu-PTFE/Al tandem EFP of the damage process against multi-spaced plates is established, revealing the penetration and deflagration-enhanced mechanisms. Subsequently, a two-step segmented numerical simulation for the penetration–deflagration coupling effects is conducted, and the time-space interaction process and damage results between kinetic energy penetration and CE deflagration are obtained. A series of experiments of tandem EFPs against spaced plates are conducted, including the different materials, thickness ratio, and standoff. Experimental results show that compared with Cu–Cu tandem EFP with the same condition, the penetration ability of Cu-PTFE/Al composite EFP is reduced, but the damage enhancement effect is greatly improved; the maximum damage area of a single plate is increased by 220.1%, and the average damage area of a single plate is increased by 76.2%. This study provides important reference data and a theoretical basis for the design of metal-reactive tandem EFPs.

Preface

It is a pleasure to welcome you to the 2023 8th International Seminar on Computer Technology, Mechanical and Electrical Engineering (ISCME 2023). At this dynamic and innovative time, we were honored to invite academic elites from all over the world to discuss the latest advances and cutting-edge research in computer technology, mechanical and electrical engineering.ISCME 2023 was held in Nanjing, China from 17th to 19th November 2023 (hybrid event). It focused on cutting-edge issues in computer technology, mechanical and electrical engineering, and provided a platform for academia to share knowledge, exchange views and promote collaboration.The Conference has invited renowned scholars and experts from around the world, who brought us a series of fascinating thematic presentations. These reports covered multiple aspects of computer technology, mechanical and electrical engineering, including but not limited to hot topics such as Artificial Intelligence, Big Data Analytics, Smart Grid, Electrical Traction Systems and Controls, Mechanical and Electrical Integration, etc. We believe that these reports have provided participants with insight and inspiration, and promoted research and development in related fields. In addition, it featured oral presentations and poster presentations, providing an opportunity for researchers to present their research findings. It was an important platform for participants to exchange and interact with each other, helping to share experiences, promote cooperation and build new partnerships.The aim of ISCME 2023 was to promote interdisciplinary collaboration and innovation in the fields of computer technology, mechanical and electrical engineering. We believe that through the interaction and cooperation of this Conference, we have deepened our understanding of these fields, promoted interdisciplinary integration, and provided new solutions to the complex problems facing the world today.Finally, we believe that the proceedings of this conference will be of great significance to the academic community. The proceedings features outstanding papers from ISCME 2023, which represents the latest research results and innovative ideas. By publishing and sharing these papers, we are able to further expand the impact of our research, promote communication and collaboration among the academic community, and provide valuable references for future research.We would like to acknowledge all those who supported and participated in ISCME 2023. We look forward to have your active participation in future series conference of ISCME!The Committee of ISCME 2023List of Committee Member is available in this pdf.

Utilizing Optimal Physics-Informed Neural Networks for Dynamical Analysis of Nanocomposite One-Variable Edge Plates

This study presents an innovative Physics-Informed Neural Network (PINN) approach designed to predict the dynamic responses of the One-Variable Edge Plate (OVEP), a unique plate structure characterized by an edge defined by arbitrary mathematical functions. The OVEP is constructed from a nanocomposite material reinforced with graphene nanoplatelets. Utilizing an optimized PINN pipeline, this research successfully predicts the vibration characteristics of the OVEP, encompassing linear, nonlinear vibrations, and beating phenomena. The study also demonstrates that the optimal PINN outperforms conventional neural network in terms of stability, accuracy (achieving above 99% accuracy), and efficiency in predicting long-duration vibrations. Additionally, the computational time required for generating testing results is notably diminished compared to traditional partial differential equation (PDE) solvers (reduced by about 3 to 12 times). To demonstrate model robustness, synthetic noise is intentionally introduced into the training data. The results not only enhance our understanding of the complex dynamics of the OVEP but also highlight the effectiveness of the proposed PINN framework in capturing and forecasting the dynamic behaviors of advanced plate structures. This research presents a promising potential for addressing dynamic problems in the fields of aerospace, civil, and mechanical engineering.

Preface

The 2nd International Conference on Mechanical Engineering and Applied Sciences, 2022 (ICMEAS – 2022) was a continuation of the previous endeavor dedicated to gather a significant number of diverse leading scholar, scientist, academician, researchers, industrial experts etc., together from different parts of the globe and exchange their experiences and researches. That conference offered a platform to junior researchers and scientist to have an exposure to a wider but uniquely intellectual community and have interaction with them. It gave an exceptional value for students, academics and industry researchers. The ICMEAS – 2022 also provided a premier interdisciplinary platform for researchers, practitioners and educators to present and discuss the most recent innovations, trends, and concerns as well as practical challenges encountered and solutions adopted in the fields of Mechanical, Manufacturing, Aeronautical, Naval, and Energy Engineering and other related fields. This conference was run both online and physical modes over a period of three days of time.The ICMEAS – 2022 conference was a great success with the relentless effort of each member of the organizing committee and active participation of the organizing partners, and spontaneous response of the scholars, researchers and scientist from around the world. The voluntary contribution of the scientific community in completing the rigorous peer review process was remarkable.It would not be possible without the unreserved patronization of the Commandant MIST and persistent conviction of the Chair, Co-Chair and Organizing Chair of the ICMEAS – 2022 conference. Last but not the least, contribution of all sponsors, particularly MJL Bangladesh Limited was undeniable to make that conference successful.List of Organising Committee, Advisory Committee, Scientific Committee, Publication and Technical Sub Committee, Reviewers are available in this pdf.

An improved method for lateral surface development of a circular truncated cone using vertical projection and its applications

In the field of mechanical engineering, particularly within the automotive, shipbuilding the utilization of metal sheets to create intersecting componentsis of great importance. However, the precise development of the circular surfaces that intersect with the circular truncated conical surface poses a critical challenge. It is essential to establish the intersection and accurately represent it on engineering drawings. This paper aims to overcome the limitations of existing approximate methods for the 2D development of circular truncated conical surfaces. This research offers a comprehensive solution for the accurate development of circular truncated cones, thereby enhancing precision and efficiency in engineering designs within industries such as automotive, shipbuilding, and pipeline engineering. By providing a quick and versatile development method based solely on vertical projection, contribute to the advancement of practical applications in these industries.

Dynamic performance of functionally graded composite structures with viscoelastic polymers

The functionally graded composite structures with viscoelastic polymers inherits the excellent performance of functionally graded composites and also possesses large damping performance, which has broad application prospects in the aerospace and mechanical engineering fields. However, due to the complexity of the structure itself, there is limited literature available on its theoretical modeling for efficient solutions. To predict its dynamic performance, a simplified dynamic model of the functionally graded composite structures with viscoelastic polymers is established. This model takes into account the displacement transfer relationship between the functional graded composite layer and the viscoelastic polymer layer. The governing differential equations are obtained by applying the Navier method and complex modulus theory. These equations are then solved using the Rayleigh–Ritz method. The validity of the theoretical model is confirmed by comparing it with existing literature and the results obtained from ANSYS software. Additionally, the model that has been developed is used to analyze how the graded index and elastic modulus of the structure, as well as its geometric parameters, affect its vibration and damping characteristics.

Investigating the Time Spent on Manufacturing Parts of Complex Geometry Using Additive and Traditional Technologies

The research objective is to conduct a comprehensive analysis of the time spent on the production of parts of complex geometry using additive and traditional technologies. In modern industrial production, especially in the field of mechanical engineering, the manufacture of parts with complex shapes is becoming more and more in demand. These parts often have a high degree of complexity and require precise and efficient processing. The use of additive and traditional technologies in the production of parts can present various advantages and disadvantages, including production speed, manufacturing quality and overall time costs. However, there is insufficient research comparing the time costs of these two production methods, especially in the context of manufacturing parts of complex geometry. This work aims to fill this knowledge gap by analyzing and comparing the time spent on manufacturing parts using additive and traditional technologies. The results of this research can be useful for both the scientific community and industrial enterprises, helping them make informed decisions when choosing production technology for specific tasks.

ФОРМАЛИЗАЦИЯ БИЗНЕС-ПРОЦЕССОВ ПРЕДПРИЯТИЯ ПРИ МОДЕЛИРОВАНИИ АВТОМАТИЗИРОВАННОЙ СИСТЕМЫ УПРАВЛЕНИЯ ВЗАИМООТНОШЕНИЯМИ С КЛИЕНТАМИ

A pressing issue of automation and digitalization of processes in a manufacturing enterprise is the introduction of an automated customer relationship management system, namely a CRM system (Client Relationship Management System) into the structure of a functioning enterprise. The stage of in-depth study of the enterprise’s business processes, building the structure of business processes and modelling the future system allow one to significantly reduce the implementation time of the automated system, to clearly assess the compliance of the task and the future system, and to fulfil the effective implementation of a CRM system at a manufacturing enterprise. At the preliminary analysis stage, the issues of identifying the main entities of the system and determining the level of their interaction are resolved. The aim of the study is to describe the methodology for constructing a conceptual model of a CRM system using the example of conducting research on the structure of the enterprise’s business processes and further formalizing the results of preparatory work for the subsequent effective implementation of a CRM system. The main research methods are theoretical analysis, formalization and methods for constructing information models. The novelty of the work lies in examining poorly-studied aspects of the preliminary analysis when implementing CRM systems, identifying patterns in the description of typical non-production processes and their formalization for a functioning manufacturing enterprise. The study results can be used in designing the architecture, programming and setting up a CRM system at an enterprise in the field of mechanical engineering and other types of production.

Exploring the impact of industry 4.0 on marine mechanical engineering in the Philippines: Opportunities and challenges in the 21st century

Industry 4.0 is revolutionizing the way we do business and operate our industries today. The marine mechanical engineering industry in the Philippines is not exempt from this digital transformation. The advancement of technology has paved the way for the development of smart ships and the implementation of automated systems in the maritime industry. This review paper explores the impact of Industry 4.0 on marine mechanical engineering in the Philippines, the opportunities it presents, and the challenges it brings. The paper starts with a brief introduction to Industry 4.0 and its various components that are relevant to the marine mechanical engineering industry. It then delves into the current state of the industry in the Philippines, including its strengths and weaknesses. The review paper discusses the opportunities that Industry 4.0 presents in terms of improving efficiency, reducing costs, and increasing safety in the maritime industry. It also highlights the challenges that come with implementing new technologies, such as cybersecurity threats and the need for upskilling the workforce. The paper concludes by emphasizing the need for the marine mechanical engineering industry in the Philippines to embrace Industry 4.0 to stay competitive and relevant in the 21st century. The authors suggest that stakeholders must work together to develop a clear roadmap for the adoption of new technologies and address any barriers to implementation. The review paper provides valuable insights for policymakers, industry players, and researchers in the field of marine mechanical engineering in the Philippines. Keywords: Industry 4.0, Marine Mechanical Engineering, Philippines, Opportunities, Challenges

MHD boundary layer micropolar fluid flow over a stretching wedge surface: Thermophoresis and brownian motion effect

To investigate the consequence of thermophoresis and Brownian diffusion on convective boundary layer micropolar fluid flow over a stretching wedge-shaped surface. The effects of 
 non-dimensional parameters namely coupling constant parameter (0.01 ≤ B1 ≤ 0.05), magnetic parameter (1.0 ≤ M ≤ 15.0), Grashof number (0.3 ≤ Gr ≤ 0.9), modified Grashof number 
 (0.3 ≤ Gm ≤ 0.8), micropolar parameter (2.0 ≤ G2 ≤ 7.5), vortex viscosity constraint (0.02 ≤ G1 ≤ 0.2), Prandtl number (7.0 ≤ Pr ≤ 15.0), thermal radiation parameter (0.25 ≤ R ≤ 0.50), Brownian motion parameter (0.2 ≤ Nb ≤ 0.62), thermophoresis parameter (0.04 ≤ Nt ≤ 0.10), heat generation parameter (0.1 ≤ Q ≤ 0.5), Biot number (0.65 ≤ Bi ≤ 1.0), stretching parameter (0.2 ≤ A ≤ 0.5), Lewis number (3.0 ≤ Le ≤ 7.0), and chemical reaction parameter (0.2 ≤ K ≤ 0.7) on the steady MHD heat and mass transfer is investigated in the present study. The coupled non-linear partial differential equations are reduced into a set of non-linear ordinary differential equations employing similarity transformation. Furthermore, by using the Runge-Kutta method followed by the shooting technique, the transformed equations are solved. The main goal of this study is to investigate the numerical analysis of nanofluid flow within the boundary layer region with the effects of the microrotation parameter and velocity ratio parameter. The novelty of this paper is to propose a numerical method for solving third-order ordinary differential equations that include both linear and nonlinear terms. To understand the physical significance of this work, numerical analyses and tabular displays of the skin friction coefficient, Nusselt number, and Sherwood number are shown. The new approach of the present study contributes significantly to the understanding of numerical solutions to non-linear differential equations in fluid mechanics and micropolar fluid flow. Micropolar fluids are becoming even more of a focus due to the desire for engineering applications in various fields of medical, mechanical engineering, and chemical processing.

Адаптация системы ЧПУ станка к условиям комбинированной обработки

Introduction. Increasing the efficiency of processing technologies for products made from modern high-strength, difficult-to-process materials with increased physical, mechanical and operational properties consists not only in improving the technology itself, the tools for its implementation, but also in modernizing technological equipment taking into account new achievements in the field of mechanical engineering. Modern computer numerical control (CNC) equipment is now quite advanced in terms of controlling basic cutting movements. Adaptive monitoring and control systems, as a rule, additionally installed on processing equipment, make it possible to further improve the quality of processing parameters. With the development of new hybrid and combined technologies that combine several types of influence on the product being processed, the issue of synchronizing the automatic control of the movements of parts of technological equipment with the control and management of accompanying processes of combined technologies has become acute. One example of such technologies is electrochemical diamond grinding with periodic dressing of the working surface of a diamond wheel using reverse polarity current. The polarity of the current and the duration of its pulses are controlled by special programmable devices. Current switching units are connected to it. It serves to supply alternating currents of direct and reverse polarity to the electrical circuit and is made on the basis of key elements. Installing such programmable devices on CNC machines leads to its’ equipping with an additional autonomous automatic control system. At the same time, it is difficult to coordinate the operation of the machine’s CNC system, which controls the movements of its working parts, and the programmable device used to control the polarity and duration of current pulses during combined processing. The purpose of the work is to synchronize the CNC system of the machine with the control system for the process of periodically changing the polarity of the current. The study was carried out on an experimental stand. Methods. The research methodology involved conducting an experiment consisting of synchronizing the operation of the machine’s CNC system with the operation of the control system for the process of periodically changing the polarity of the current. To evaluate the results, the time of movement of the diamond wheel as a result of the working stroke was compared with the duration of current pulses of different polarities specified in the control program of the developed software. Results and discussions. As a result of the research, it is established that the developed software and hardware complex makes it possible to synchronize in the CNC system of the machine tool the control of the movements of the working parts with automatic control of the periodic change of current polarity during electrochemical diamond grinding, which can significantly expand the technical capabilities of CNC machines.

The concept of teaching mechanical engineering students to prepare design documents in accordance with national and international standards

The purpose was to develop the concept of training students - mechanical engineers in the variable formatting of design documents in accordance with national and international standards and to create a set of educational and methodological materials for its implementation.
 The concept envisages the development and implementation of two simultaneously taught courses covering Ukrainian and international requirements for the development and execution of design documents. It is the simultaneous teaching of these courses that makes it possible to acquire the relevant knowledge and skills and to have a unique opportunity to compare different standardisation systems for the same type of design documents in accordance with different stages of the machine life cycle.
 The didactic foundations of the pedagogical process and modern principles of organising the learning process have been applied to involve the higher education seekers in mastering professional experience in the field of mechanical engineering and creating positive changes in the formation and development of the individual.
 New courses have been created and teaching materials have been prepared for mechanical engineering students to study national and international regulatory frameworks and master the practical skills of their use in future professional activities related to the formatting of design documents.
 The work applies a systematic approach that combines elements of the pedagogical system in conjunction with the integrity of the evolutionary development of the applicant, taking into account the dynamic state of development of the modern engineering industry at the national and international levels.
 Acquiring relevant knowledge and skills by higher education seekers in design documents following national and international standards ensures an increase in their professional status and competitiveness in the Ukrainian labor market and accelerates the adaptation of Ukrainian specialists to the current conditions of globalization in mechanical engineering

Remarks on Solving Methods of Nonlinear Equations

Abstract: In the field of mechanical engineering, many practical problems can be converted into nonlinear problems, such as the meshing problem of mechanical transmission. So the solution of nonlinear equations has important theoretical research and practical application significance. Whether the traditional Newton iteration method or the intelligent optimization algorithm after the popularization of computers, both them have been greatly enriched and developed through the continuous in-depth research of scholars at home and abroad, and a series of improved algorithms have emerged. This paper mainly reviews the research status of solving nonlinear equations from two aspects of traditional iterative method and intelligent optimization algorithm, systematically reviews the research achievements of domestic and foreign scholars, and puts forward prospects for future research directions.

ПІДВИЩЕННЯ ЯКОСТІ ВІБРАЦІЙНОЇ ДІАГНОСТИКИ ВУЗЛІВ ТА АГРЕГАТІВ АГРАРНОЇ ТЕХНІКИ

It is known that friction and vibrations are the main factors affecting the condition of the equipment during its operation. Therefore, monitoring and diagnostics of vibration resistance of machines and mechanisms are of great importance for their effective operation. This article will present and describe methods of vibroacoustic diagnostics, which are simple and sensitive for detecting defects in various mechanisms and machines, in particular in the agricultural sector. One of the key elements used to diagnose and control the degree of wear of parts is a piezoelectric transducer. It is easy to use and highly accurate. Such converters are almost not affected by electric and magnetic fields, acoustic signals and other mechanical vibrations, except in certain cases. This article will consider the improvement of the piezoelectric transducer, which can be used to measure the vibration rate of oscillations of elements and assemblies of agricultural machines. The technical solution includes the use of a differential amplifier with buffer stages connected to a basic differential amplifier. This approach allows you to reduce the impact of out-of-band interference and increase measurement accuracy. The use of a common-mode perturbation voltage is also an important element in the improved piezoelectric transducer, helping to provide more accurate results. This article reveals important aspects of vibration diagnostics and offers a new technical solution to improve measurements. It will be useful for specialists in the field of mechanical engineering and agricultural industry, who are interested in effective control and support of machines and mechanisms during their work.

Nonlinear Forced Vibration Analysis using ‘Elmer’ FEM Package to Develop Poincaré Map and Correlation Method-based Damage Indicators

With the rapid advancement of sensor technology, structural health monitoring (SHM) is also blossoming with prowess in the field of civil, mechanical and aerospace engineering. It deals with the initiation of damage and its characteristic behavior in a deterministic or predictive way. The time-dependent fluctuation associated with the dynamic motion of structures was addressed with few efficient indicators in the past to identify the presence of damage as well as to localize the faulty area. The formulation of all those indicators is validated on specific structural arrangements with certain assumptions. This limitation is considered in this article to project the global applicability of the method along with the inherent constraints. The damage detection in the time-domain is considered to utilize direct accessibility of responses from the sensors attached to the members. It reduces the computational difficulty in transforming response to another domain and also associated approximations that emerge through numerical calculations. Broadly, two types of methods are discussed in this article along with modelling and analysis procedure; methods developed from cross-correlation of response and graphical method or Poincaré map. The model of cantilever beam and axial bar is developed in FreeCad where damage is induced by reducing either thickness or Young’s modulus of damaged elements to simulate cracked member. Meshing of member is done in Gmsh. To generate response history of state variables a newly developed finite element (FE) analysis software package Elmer is then employed for the dynamic analysis of the member with geometric nonlinearity. At last, application of Teager energy operator (TEO) in noise reduction is explained with a general example.

Alleviating thermal challenges in hydrodynamic bearings: A novel approach through thrust bearing pads with embedded cooling circuitry and deep recess

At high speeds minimization of operating temperature is the critical design objective in hydrodynamic thrust bearings. During the high speed operations of heavy duty machines high temperatures are generated in thrust bearings due to vigorous viscous shearing of lubricant oil film. Under such circumstances thermal effects gain critical importance. Consequences of thermal effects include pad deformation, increased wear, material degradation etc. in hydrodynamic bearings. This research explores a pioneering approach to mitigate thermal challenges by integrating deep recesses and cooling circuitry in thrust bearing pads. The integrated design facilitates enhanced heat dissipation and load carrying capacity along with optimized lubrication process. In this study CFD (CFX) simulation code is used to numerically evaluate the effect of hybrid bearing configuration (conventional thrust pad equipped with deep recess and embedded cooling circuitry) on the performance parameters of thrust bearing. The simulation results confirm an appreciable decrease in maximum pad temperature and thermal pad deformation. The maximum pad temperature decreased from 85℃ to 71℃. Similarly value of thermal pad deformation decreased from 36 µm to 24 µm. The outcomes hold promise for enhancing the thermal performance of existing machinery and inspiring the development of next-generation thrust bearing systems, marking a transformative advancement in the field of mechanical engineering.

Numerical Study of Crack Prediction and Growth in Automotive Wheel Rims.

Finite element analysis has become an essential tool for simulating and understanding crack growth. This technique holds significant importance in the field of mechanical engineering, where it finds wide application in the design and optimization of structural components and material properties. This work began with the identification of critical zones and estimated the number of load life repeats through fatigue analysis, specifically applied to automotive rims utilizing innovative finite element methods. To investigate crack behavior, we are used the Extended Finite Element Method (XFEM) with the volumetric approach to compute the Stress Intensity Factor (SIF). The results obtained by our study align closely with experimental tests in terms of detecting the critical zone where a crack can appear. Our findings contribute to the understanding of fatigue behavior in automotive rims, offering new insights into their structural integrity and performance under various load conditions.