Acta Mechanica et Automatica最新文献

Thermal and Visualisation Study of the HFE7100 Refrigerant Condensation Process HFE7100 制冷剂冷凝过程的热学和可视化研究

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0008

Tadeush Bohdal, M. Sikora, Karolina Formela

{"title":"Thermal and Visualisation Study of the HFE7100 Refrigerant Condensation Process","authors":"Tadeush Bohdal, M. Sikora, Karolina Formela","doi":"10.2478/ama-2024-0008","DOIUrl":"https://doi.org/10.2478/ama-2024-0008","url":null,"abstract":"Abstract Technological advances are contributing to the search for highly efficient energy designs, and increasing interest in compact heat exchangers. Indeed, small channel diameters determine large heat transfer coefficients and condition a significant heat transfer area about the overall volume of the heat exchanger, as well as a smaller amount of refrigerant flowing in the system. Nevertheless, the operating stability and energy efficiency of compact heat exchangers are influenced by two-phase flow structures, which depend on thermal flow parameters. Knowledge of the structures formed during the condensation process is therefore essential for optimising the operation of refrigeration and air-conditioning equipment. This article presents the results from experimental studies of the HFE7100 refrigerant, from the hydrofluorocarbon group, condensation process in mini-channels with hydraulic diameters dh = 2.0 mm, 1.2 mm, 0.8 mm and 0.5 mm. Thermal flow characteristics were determined, and the forming structures of two-phase flow were recorded. The results of visualisation were subjected to morphological image analysis, based on a special algorithm written in MATLAB software. The algorithm makes it possible to determine the void fraction, which is necessary for calculating the vapour quality, as well as the area of vapour bubbles and their number, directionality and length along the x- and y-axes.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"11 4","pages":"60 - 67"},"PeriodicalIF":0.7,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139383102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The CO2 Capture System with a Swing Temperature Moving Bed 带摇摆式温床的二氧化碳捕获系统

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0012

Ewa Kozak-Jagieła, Monika Rerak, W. Zima, Artur Cebula, S. Grądziel, Giorgia Mondino, Richard Blom, L. Nord, Vidar T. Skjervold

{"title":"The CO2 Capture System with a Swing Temperature Moving Bed","authors":"Ewa Kozak-Jagieła, Monika Rerak, W. Zima, Artur Cebula, S. Grądziel, Giorgia Mondino, Richard Blom, L. Nord, Vidar T. Skjervold","doi":"10.2478/ama-2024-0012","DOIUrl":"https://doi.org/10.2478/ama-2024-0012","url":null,"abstract":"Abstract The reduction in CO2 emissions is now a very popular topic. According to the International Energy Agency, CO2 emitted in 2021 was 6% more than that emitted in 2020. Carbon capture and storage (CCS) is gaining popularity as a possible solution to climate change. Experts estimate that industry and power plants will be responsible for 19% of total CO2 emissions by 2050. This paper presents the design of a semi-industrial-scale system for CO2 capture based on the moving bed temperature swing adsorption technology. According to the results of laboratory tests conducted by the SINTEF industry, this technology demonstrates high capture efficiency (>85%). The CO2 capture medium involved in adsorption is activated carbon passing through individual sections (cooling, heating, adsorption), where CO2 is bonded and then released. The heat and mass transfer processes are realised on the developed stand. The heat exchangers use steam and water as the heating/cooling medium. The paper reviews the existing solutions and describes the developed in-house design of heat exchangers that will ensure heat transfer conditions being a trade-off between economic and efficiency-related issues of the CO2 capture process. The designed test stand will be installed in a Polish power plant and is expected to meet the method energy intensity target, set at ≤ 2.7 MJ/kg CO2, with a capture efficiency exceeding 85%. The aim of the work was to develop and solve technical problems that would lead to the construction of a CO2 capture station with parameters mentioned above. This stand uses an innovative method where CO2 is captured by contacting the fluid (gases) with solid particles. The heat exchange associated with the heating and cooling of the adsorbent had to be solved. For this purpose, heat exchangers were designed with high thermal efficiency and to prevent the formation of mounds.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"8 32","pages":"93 - 100"},"PeriodicalIF":0.7,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139381336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue Behaviour of Medium Carbon Steel Assessed by the Barkhausen Noise Method 用巴克豪森噪声法评估中碳钢的疲劳行为

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0005

K. Makowska, T. Szymczak, Z. Kowalewski

引用次数: 0

The Variational Iteration Method for a Pendulum with a Combined Translational and Rotational System 具有平移和旋转组合系统的摆的变量迭代法

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0006

Muhammad Amir, Asifa Ashraf, J. A. Haider

{"title":"The Variational Iteration Method for a Pendulum with a Combined Translational and Rotational System","authors":"Muhammad Amir, Asifa Ashraf, J. A. Haider","doi":"10.2478/ama-2024-0006","DOIUrl":"https://doi.org/10.2478/ama-2024-0006","url":null,"abstract":"Abstract The dynamic analysis of complex mechanical systems often requires the application of advanced mathematical techniques. In this study, we present a variation iteration-based solution for a pendulum system coupled with a rolling wheel, forming a combined translational and rotational system. Furthermore, the Lagrange multiplier is calculated using the Elzaki transform. The system under investigation consists of a pendulum attached to a wheel that rolls without slipping on a horizontal surface. The coupled motion of the pendulum and the rolling wheel creates a complex system with both translational and rotational degrees of freedom. To solve the governing equations of motion, we employ the variation iteration method, a powerful numerical technique that combines the advantages of both variational principles and iteration schemes. The Lagrange multiplier plays a crucial role in incorporating the constraints of the system into the equations of motion. In this study, we determine the Lagrange multiplier using the Elzaki transform, which provides an effective means to calculate Lagrange multipliers for constrained mechanical systems. The proposed solution technique is applied to analyse the dynamics of a pendulum with a rolling wheel system. The effects of various system parameters, such as the pendulum length, wheel radius and initial conditions, are investigated to understand their influence on the system dynamics. The results demonstrate the effectiveness of the variation iteration method combined with the Elzaki transform in capturing the complex behaviour of a combined translational and rotational system. The proposed approach serves as a valuable tool for analysing and understanding the dynamics of similar mechanical systems encountered in various engineering applications.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"29 9","pages":"48 - 54"},"PeriodicalIF":0.7,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139384059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machining of TiAl6V4 Using Lubricants Containing Renewable Microalgae-Born Performance Additives 使用含可再生微藻高性能添加剂的润滑油加工 TiAl6V4

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0007

Thomas Koch, Dominik Wenzel, Ralf Gläbe

{"title":"Machining of TiAl6V4 Using Lubricants Containing Renewable Microalgae-Born Performance Additives","authors":"Thomas Koch, Dominik Wenzel, Ralf Gläbe","doi":"10.2478/ama-2024-0007","DOIUrl":"https://doi.org/10.2478/ama-2024-0007","url":null,"abstract":"Abstract Titanium and its alloys represent a special class of materials. A density of 4.81 g/cm3, a tensile strength of over 1,200 MPa, a fatigue strength greater than that of steel, a low modulus of elasticity and its self-passivating, inert surface make titanium an ideal material for lightweight structures in aerospace, marine applications, the chemical industry and medical implants. Although titanium is inert in its oxidised state, its nascent surface created in machining reacts with almost everything in its environment, including the tool. Moreover, its poor thermal conductivity results in high thermal stress on the tools. Overall, these properties lead to high wear rates and result in the requirement for finding a particularised solution for processes such as milling that involve the need to overcome such challenges. Such processes therefore require lubricants with well-selected performance additives. However, most of these performance additives are based on mineral oil and thus come from a non-renewable resource. In the presented work, environmental-friendly alternatives to conventional mineral oil-based performance additives were investigated. Due to the working mechanisms of performance additives in machining, this work focusses on sulphur- and phosphorus-containing polysaccharides and proteins from microalgae. It has been successfully shown that lubricants using extracts from microalgae as performance additives can be used for high-speed milling (HSC) of TiAl6V4. The investigated extracts were able to reach the performance level of conventional additives in terms of tool lifetime and wear. The results obtained show that appropriate alternatives to mineral oil-based additives exist from renewable raw-material sources.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"88 5","pages":"55 - 59"},"PeriodicalIF":0.7,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139381359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Fractional Study of MHD Casson Fluid Motion With Thermal Radiative Flux and Heat Injection/Suction Mechanism Under Ramped Wall Condition: Application of Rabotnov Exponential Kernel 斜壁条件下具有热辐射通量和注热/吸热机制的 MHD 卡松流体运动的分数研究：拉波特诺夫指数核的应用

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0011

Aziz Ur Rehman, F. Jarad, M. B. Riaz

{"title":"A Fractional Study of MHD Casson Fluid Motion With Thermal Radiative Flux and Heat Injection/Suction Mechanism Under Ramped Wall Condition: Application of Rabotnov Exponential Kernel","authors":"Aziz Ur Rehman, F. Jarad, M. B. Riaz","doi":"10.2478/ama-2024-0011","DOIUrl":"https://doi.org/10.2478/ama-2024-0011","url":null,"abstract":"Abstract The primary objective of this research is to extend the concept of fractionalized Casson fluid flow. In this study, a comprehensive analysis of magnetohydrodynamic (MHD) natural convective flow of Casson fluid is conducted, focusing on obtaining analytical solutions using the non-integer-order derivative known as the Yang–Abdel-Aty–Cattani (YAC) operator. The YAC operator utilized in this research possesses a more generalized exponential kernel. The fluid flow is examined in the vicinity of an infinitely vertical plate with a characteristic velocity denoted as u0. The mathematical modelling of the problem incorporates partial differential equations, incorporating Newtonian heating and ramped conditions. To facilitate the analysis, a suitable set of variables is introduced to transform the governing equations into a dimensionless form. The Laplace transform (LT) is then applied to the fractional system of equations, and the obtained results are presented in series form and also expressed in terms of special functions. The study further investigates the influence of relevant parameters, such as α, β, Pr, Q, Gr, M, Nr and K, on the fluid flow to reveal interesting findings. A comparison of different approaches reveals that the YAC method yields superior results compared to existing operators found in the literature. Graphs are generated to illustrate the outcomes effectively. Additionally, the research explores the limiting cases of the Casson and viscous fluid models to derive the classical form from the YAC fractionalized Casson fluid model.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"27 4","pages":"84 - 92"},"PeriodicalIF":0.7,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139384091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fuzzy Based Supervision Approach in the Event of Rotational Speed Inversion in an Induction Motor 感应电机转速反转时的模糊监控方法

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0009

Noura Rezika Hatem Bellahsene

{"title":"Fuzzy Based Supervision Approach in the Event of Rotational Speed Inversion in an Induction Motor","authors":"Noura Rezika Hatem Bellahsene","doi":"10.2478/ama-2024-0009","DOIUrl":"https://doi.org/10.2478/ama-2024-0009","url":null,"abstract":"Abstract This article aims to implement the fuzzy control for an asynchronous motor after a general representation of the vector control. We develop MAMDANI type fuzzy algorithm for MAS speed regulation; it’s one purpose is to cancel static error, decrease overshoot, decrease response time, and rise time to obtain an adequate response of the process and regulation and to have a precise, fast, stable and robust system. This paper investigates the design of a fuzzy-based approach for monitoring the inversion of the rotational speed of an induction motor. We will indeed present a robust vector control technique ex-tended to blur in the event of a fault. Direct torque control is known to produce fast and robust response in the AC drive system. However, in a steady state, a rapid and unexpected change in speed can occur which could be dangerous. The performance of the conventional PID controller can be improved by implementing fuzzy logic techniques. The first step is the modelling of the whole system, including the capacitors, the induction generator and the loads. The model is obtained using the Park transformation. The results are thus compared with those of the standard PID control. This approach is applied to a three-phase asynchronous motor (LS90Lz). The presented study improves the transient response time and the precision of the servo system. An inversion of the reference speed of rotation is considered, and the results are very convincing.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"53 11","pages":"68 - 76"},"PeriodicalIF":0.7,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139381794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Fractional Electrical Circuit Containing Two RC Ladder Elements of Different Fractional Orders 包含两个不同分数阶数 RC 梯形元件的分数电路分析

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Acta Mechanica et Automatica Pub Date : 2024-01-05 DOI: 10.2478/ama-2024-0010

Ewa Piotrowska, Rafał Melnik

引用次数: 0

Dynamic Stability of a Three-Layer Beam – Generalisation of the Sandwich Structure Theory 三层梁的动态稳定性--三明治结构理论的推广

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Acta Mechanica et Automatica Pub Date : 2023-12-30 DOI: 10.2478/ama-2024-0001

K. Magnucki, E. Magnucka-Blandzi

引用次数: 0

The Innovative Post-Weld Finishing Method and Non-Standard Cutting Tool for Carrying Out this Method 创新的焊后加工方法和用于实施该方法的非标准切割工具

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Acta Mechanica et Automatica Pub Date : 2023-12-30 DOI: 10.2478/ama-2024-0003

Olha Dvirna

{"title":"The Innovative Post-Weld Finishing Method and Non-Standard Cutting Tool for Carrying Out this Method","authors":"Olha Dvirna","doi":"10.2478/ama-2024-0003","DOIUrl":"https://doi.org/10.2478/ama-2024-0003","url":null,"abstract":"Abstract The most common method of post-weld finishing is grinding with an abrasive tool. This finishing method leads to the occurrence of faults on the treated surface: locations missed or hardened twice, structural notches and stretching residual stress in the surface layer. The faults mentioned lead to the creation and development of ordinary as well as fatigue cracks, seizing or other damage. In addition, grinding is a process that often involves manual labour, which significantly increases the time required for finishing the procedure. Moreover, it is impossible to automate this process. Also, grinding is a process that is damaging for both people and the environment. In contrast to grinding and other processes of post-weld surface finishing, the innovative method, which is the subject of this article, does not have the faults and inconveniences of the previously mentioned techniques. The post-weld surface finishing method by moving of the innovative multi-edge cutting tool along the weld bead is presented in this article. In this method, machining allowance is treated as the weld bead height, which is flush-removed with the base material in one step during one pass of the cutting tool. The adjacent teeth height of changing and increasing according to the direction of feed and the difference in height between the first and last teeth are equal to the weld bead height. The number of cutting teeth necessary to flush-finish the weld bead with the base metal surface depends on the difference in the first and last teeth height and how it is divided. The tooth length is greater than half of the distance between the adjacent cutting teeth, which enables finishing the heterogeneous post-weld surface with many defects and increased hardness. The innovative method is characterised by short machining time of the weld bead and provides an accurate, efficient and economical process.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":" 50","pages":"22 - 28"},"PeriodicalIF":0.7,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139138152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0