Periodica Polytechnica Mechanical Engineering最新文献_第2页

Analysis of Vibratory Stress Relief (VSR) Parameters on Mechanical and Metallurgical Properties of AISI 1008 振动应力消除 (VSR) 参数对 AISI 1008 机械和冶金性能的影响分析

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-04-17 DOI: 10.3311/ppme.23965

Mehdi Jafari Vardanjani, Alireza Araee

{"title":"Analysis of Vibratory Stress Relief (VSR) Parameters on Mechanical and Metallurgical Properties of AISI 1008","authors":"Mehdi Jafari Vardanjani, Alireza Araee","doi":"10.3311/ppme.23965","DOIUrl":"https://doi.org/10.3311/ppme.23965","url":null,"abstract":"Vibrational stress relief (VSR) treatment is a method of stress relief which is currently used for different alloys in different sizes. Since the effect of VSR has not been fully analyzed and compared versus thermal stress relief (TSR) process, its merits require wider investigations. In this paper VSR treatment has been performed with certain parameters to check and assure the advantages of the process in terms of mechanical and metallurgical improvements on AISI 1008 workpiece as a preparatory process. The chosen parameters consist frequency, time, and amplitude of vibration. Factorial design of the experiment using response surface methodology has been performed to obtain an optimal response in numerical and experimental tests. The testing coupons have been evaluated in terms of hardness, tensile strength, elasticity modulus, toughness, elongation before fracture, and micro-structure. Experimental results have been compared with finite element analysis (FEA) results and previous studies. FEA elastic-plastic model was used to extract mechanical properties, while hardening effect has been accounted for in the model. The study has demonstrated the influential performance of VSR on the mechanical properties of the samples i.e., yield strength, toughness, elongation, and elasticity modulus while hardness and microstructure have not been affected significantly.","PeriodicalId":513310,"journal":{"name":"Periodica Polytechnica Mechanical Engineering","volume":" 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140692371","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

Improved Method for Determining the Feed Influence on the Tangential Cutting Force During Re-drilling, Countersinking and Boring Based on the Small Sample Theory 基于小样理论的重钻、锪孔和镗孔过程中进给量对切向切削力影响的改进测定方法

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-04-02 DOI: 10.3311/ppme.29952

Volodymyr Krupa, V. Kobelnyk, Andrii Hahaliuk, V. Dzyura, Nadiia Tymoshenko

{"title":"Improved Method for Determining the Feed Influence on the Tangential Cutting Force During Re-drilling, Countersinking and Boring Based on the Small Sample Theory","authors":"Volodymyr Krupa, V. Kobelnyk, Andrii Hahaliuk, V. Dzyura, Nadiia Tymoshenko","doi":"10.3311/ppme.29952","DOIUrl":"https://doi.org/10.3311/ppme.29952","url":null,"abstract":"Methods of determining the tangential cutting force are analyzed in the work, including finite-element simulation models, the use of neural networks, analytical methods, and methods of natural experiments. A method for evaluating the influence of feed on the tangential component of the cutting force is proposed, which can be applied to test new tools, tool plates for a certain group of materials. The main advantage of the proposed method is the limited number of experiments and processing of the obtained data according to the theory of a small sample. In this study, the proposed method was used to determine the influence of countersinking feed on tangential cutting force. The basis of the approach is probabilistic and statistical methods and data processing criteria. An assessment of the homogeneity of the results of experimental studies was carried out, the law of distribution of the tangential cutting force, as well as the characteristics of its dispersion, were established. An approach to estimating the maximum value of the tangential component of the cutting force based on the maximum value is presented. This method is universal and can be used for drilling, countersinking, boring and other types of processing.","PeriodicalId":513310,"journal":{"name":"Periodica Polytechnica Mechanical Engineering","volume":"122 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752267","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

Potential of Steam Generating by The PMMA Fresnel Lens Concentrator for Indoor Solar Cooker Application PMMA 菲涅尔透镜聚光器在室内太阳能炊具应用中产生蒸汽的潜力

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-03-19 DOI: 10.3311/ppme.22547

Asrori Asrori, Pondi Udianto, Elka Faizal, Muhammad Akhlis Rizza, Kris Witono, D. Perdana

{"title":"Potential of Steam Generating by The PMMA Fresnel Lens Concentrator for Indoor Solar Cooker Application","authors":"Asrori Asrori, Pondi Udianto, Elka Faizal, Muhammad Akhlis Rizza, Kris Witono, D. Perdana","doi":"10.3311/ppme.22547","DOIUrl":"https://doi.org/10.3311/ppme.22547","url":null,"abstract":"Solar power is an alternative energy source that can be used for cooking. It is a simple, secure, and useful way to cook food without using conventional fuels that pollute the air. Solar cookers offer various benefits to the user’s health, productivity, and income as well as to the environment. Solar energy is abundant in a tropical country like Indonesia, making it a dependable and sustainable of energy resource. The study’s goal is to analyze the potency of steam produced by a solar cooker that uses a Fresnel lens concentrator. The thermal performance of the Fresnel lens concentrator with a conical receiver on the solar cooker prototype is discussed in this research. In the construction of solar cookers, PMMA (Polymethyl-Methacrylate) Fresnel lenses, manual trackers, and conical receiver types are used. The research conducts an experimental analysis of the thermal performance of the prototype solar cooker using a Fresnel lens concentrator with a conical receiver. This empirical approach provides valuable data on the efficiency and effectiveness of the solar cooker design. The experiment result shows the cumulative average solar irradiation, the average collection of solar energy per time of Fresnel lens concentrator, and the heat utilized of steam from conical receiver are 709.09 W/m², 456.14 Watt, and 383.88 Watt, respectively. The results of this study suggest that Fresnel lens concentrators are a promising development for indoor solar cookers and therefore provide a pathway for increased utilization of solar cooking technology.","PeriodicalId":513310,"journal":{"name":"Periodica Polytechnica Mechanical Engineering","volume":"151 2‐3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228484","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

Natural and Forced Convective Heat Transfer Enhancement for Solid Cylinders with Different Geometrical Shapes 不同几何形状实心圆柱体的自然对流和强制对流传热增强效应

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-03-18 DOI: 10.3311/ppme.20482

Abid Hasan Rafi, Md. Rafikur Rahman, S. M. F. Rabby, Dewan Hasan Ahmed

{"title":"Natural and Forced Convective Heat Transfer Enhancement for Solid Cylinders with Different Geometrical Shapes","authors":"Abid Hasan Rafi, Md. Rafikur Rahman, S. M. F. Rabby, Dewan Hasan Ahmed","doi":"10.3311/ppme.20482","DOIUrl":"https://doi.org/10.3311/ppme.20482","url":null,"abstract":"Enhancing heat transfer for both natural and forced convection is a common issue for any heat transfer process. Experimental studies have been carried out for six different geometrical shapes of solid bars for natural convection and forced convection with four different air velocities while keeping the same perimeter and length of the solid bars, which means the lateral surface area of the bars is the same. Results reveal that both the natural and forced convective heat transfer characteristics are greatly influenced by the geometrical shape in terms of Nusselt number (Nu), heat transfer coefficient (h), and heat transfer rate (q). In addition, isosceles and cylindrical shape geometry contribute to the lowest and highest heat transfer, respectively. As well, it is obtained from the results that convective heat transfer characteristics are directly related to the cross-sectional area, even if the perimeters are the same. Moreover, among the different geometrical shapes, the isosceles and hexagonal shapes take the shortest and longest duration to attain the steady-state condition in the conductive heat transfer process. The convective heat transfer characteristics are well-validated, with available results for both natural and forced convection heat transfer.","PeriodicalId":513310,"journal":{"name":"Periodica Polytechnica Mechanical Engineering","volume":"47 30","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140231580","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

Vibration Analysis of Damaged Viscoelastic Composite Sandwich Plate 受损粘弹性复合夹层板的振动分析

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-03-14 DOI: 10.3311/ppme.19466

Baali Messaoud

引用次数: 0

Effect of Processing Parameters and Wall Thickness on the Strength of Injection Molded Products 加工参数和壁厚对注塑成型产品强度的影响

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-02-14 DOI: 10.3311/ppme.24068

Szabolcs Horváth, József Gábor Kovács

引用次数: 0

Effect of Processing Parameters and Wall Thickness on the Strength of Injection Molded Products 加工参数和壁厚对注塑成型产品强度的影响

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-02-14 DOI: 10.3311/ppme.24068

Szabolcs Horváth, József Gábor Kovács

引用次数: 0

Lattice Boltzmann Simulation of Incompressible Fluid Flow in Two-sided Converging and Diverging Lid-driven Square Cavity 双面收敛和发散盖驱动方形空腔中不可压缩流体流动的格子玻尔兹曼模拟

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-02-01 DOI: 10.3311/ppme.22045

Mahendra Yadav, Rajendra Singh Yadav, O. Makinde, Pankaj Mathur

{"title":"Lattice Boltzmann Simulation of Incompressible Fluid Flow in Two-sided Converging and Diverging Lid-driven Square Cavity","authors":"Mahendra Yadav, Rajendra Singh Yadav, O. Makinde, Pankaj Mathur","doi":"10.3311/ppme.22045","DOIUrl":"https://doi.org/10.3311/ppme.22045","url":null,"abstract":"The present study focuses on the predictions of flow behavior, streamlines and some other factors of a two adjacent-sided converging and diverging lid-driven square cavity filled with fluid. In the diverging case, the top wall of the cavity is considered to be in motion from left to right, and the left wall is considered to be in motion from top to bottom simultaneously with identical speeds. It is found that for a low Reynolds number, the flow behavior seems to be symmetric with respect to one of the diagonals of the cavity, and at a critical Reynolds number 1121, the symmetry of the flow behavior blows up, and an asymmetric form is obtained due to the increased inertia and turbulence effects. Any increment in the Reynolds number above the critical Reynolds number develops this asymmetry gradually more and more. In the second phenomenon, the converging phenomenon, the top wall of the cavity is assumed to be in motion from left to right, and the right wall is assumed to be in motion from bottom to top simultaneously with identical speeds so that they converge at the corner of the cavity. This case gives rise to two critical Reynolds numbers Re = 969 and Re = 2053 and the flow behavior for both asymmetric states was found to be opposite. Furthermore, the rate of convergence of the present methodology, lattice Boltzmann methodology, for various Reynolds numbers is found to be very high except for the critical and their nearby Reynolds numbers.","PeriodicalId":513310,"journal":{"name":"Periodica Polytechnica Mechanical Engineering","volume":"19 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139687440","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

Interaction Simulation of a Lateral Wall Distance on Aerodynamic Characteristics of a Simplified High-speed Train 侧壁距离对简化高速列车空气动力特性的交互模拟

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-01-29 DOI: 10.3311/ppme.22411

Alireza Hajipour, Arash Mirabdolah Lavasani, Mohammad Eftekhari Yazdi

{"title":"Interaction Simulation of a Lateral Wall Distance on Aerodynamic Characteristics of a Simplified High-speed Train","authors":"Alireza Hajipour, Arash Mirabdolah Lavasani, Mohammad Eftekhari Yazdi","doi":"10.3311/ppme.22411","DOIUrl":"https://doi.org/10.3311/ppme.22411","url":null,"abstract":"The natural features, such as mountain slopes, cliffs, and the human-made artificial walls, such as train station walls, windbreakers, and even residential and office buildings, can affect the movement structure of high-speed trains. In the present paper, using computational fluid dynamics (CFD), the interaction of lateral wall distances on the aerodynamic characteristics of a high-speed train is simulated. To achieve this -using OpenFOAM- the governing equations are solved. Also, the used solver is simpleFoam which the Simple algorithm (Semi-Implicit Method for Pressure Linked Equations) is applied to decouple the Navier-Stokes's equations. In the following a simplified high-speed train is considered, combining Reynolds-Averaged Navier-Stokes (RANS) equations and k-ω (SST) turbulence approach, an incompressible turbulent air-flow around it is simulated. Also, the flow and aerodynamic structures affected by distance changes between the lateral wall and the train are analyzed. Therefore, the lift, drag, and side aerodynamic forces and their corresponding moments as pitching, yawing, and rolling are provided and compared for four distance cases. In the following, the most significant components of flow structure, such as streamlines, velocity and pressure distributions, and vortices structures, are discussed. Finally, using the turbulent kinetic energy analysis, the air-flow's turbulent level around the train, especially in critical areas, is investigated. The findings illustrated that the closer distance between the train and the wall has more destructive effects on the movement of the high-speed trains. The results of the present study can be helpful for designing structures along the rail and distancing it from natural features.","PeriodicalId":513310,"journal":{"name":"Periodica Polytechnica Mechanical Engineering","volume":"46 27","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140487592","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

Investigation of 3D Printed Underwater Thruster Propellers Using CFD and Structural Simulations 利用 CFD 和结构模拟研究 3D 打印水下推进器螺旋桨

Periodica Polytechnica Mechanical Engineering Pub Date : 2024-01-25 DOI: 10.3311/ppme.23795

Krisztián Kiss-Nagy, G. Simongáti, Péter Ficzere

{"title":"Investigation of 3D Printed Underwater Thruster Propellers Using CFD and Structural Simulations","authors":"Krisztián Kiss-Nagy, G. Simongáti, Péter Ficzere","doi":"10.3311/ppme.23795","DOIUrl":"https://doi.org/10.3311/ppme.23795","url":null,"abstract":"Unmanned Surface Vehicles (USV) and Autonomous or Remotely Operated Underwater vehicles (AUV, ROV) are developing and spreading rapidly in various industries. A common feature of these vehicles is that they are propelled by small plastic (or metal) propellers in most cases. Additive manufacturing can offer an excellent opportunity for rapid prototyping and the development of new models. This paper aims to investigate the fundamental aspects to be considered in the geometric design and manufacturing of small (diameter less than 100 mm) PLA (Polylactic acid) propellers 3D-printed using Fused Filament Fabrication (FFF) technology. In-service deformation of 3D-printed PLA ducted propellers with average geometry was investigated to determine the effect on the thrust and torque on the blades. For this purpose, one-directional FSI (Fluid Solid Interaction) simulations were performed using CFD (Computational Fluid Dynamics) and structural simulations. The propeller CAD geometries were generated using an in-house MATLAB script. The variable parameters of each version are the thickness, skew, and rake of the propeller blades. For the structural simulations, it was considered that the material properties of PLA parts printed with FFF technology depend on the print orientation. The results of the simulations show that except for extreme geometries (e.g., thin blades, skew, or rake more than 10°), the deformation of small PLA ducted propellers is not significant. CFD studies of the deformed geometries have shown that the resulting deformation has no significant effect on the thrust and torque of the propeller and thruster.","PeriodicalId":513310,"journal":{"name":"Periodica Polytechnica Mechanical Engineering","volume":"15 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139597324","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