Strojniški vestnik最新文献

Design and Optimization of an Umbrella-Type Shield Based on 3D CFD Simulation Technology 基于三维CFD仿真技术的伞形屏蔽设计与优化

Strojniški vestnik Pub Date : 2023-09-14 DOI: 10.5545/sv-jme.2023.644

Longfei Li, Xin He, Taowei Jiao, Yumeng Xiao, Xipan Wei, Wei Li

{"title":"Design and Optimization of an Umbrella-Type Shield Based on 3D CFD Simulation Technology","authors":"Longfei Li, Xin He, Taowei Jiao, Yumeng Xiao, Xipan Wei, Wei Li","doi":"10.5545/sv-jme.2023.644","DOIUrl":"https://doi.org/10.5545/sv-jme.2023.644","url":null,"abstract":"Mechanical shields can effectively alleviate the problems of low pesticide utilization and severe environmental pollution. This manuscript uses a computational fluid dynamics (CFD) method to investigate the anti-drift mechanism of mechanical shields, study the airflow forms around them, and establish an accurate simulation model. The aerodynamic characteristics of six shields were studied, and their anti-drift effect was compared. Then, the size and working parameters were optimized using the response surface methodology (RSM). Mechanical shields can significantly improve the fog droplet deposition rate (DR) compared with the conventional spray method (no shield), among which the umbrella-type shield has the best effect; optimizing the size and selecting suitable working parameters can increase the DR to 77.31 %. The field trial showed that the DR of the conventional spray method was reduced by 31.9 % at 5 m/s compared with 3 m/s, while the DR of the shield spray method was reduced by only 3.6 % at 5 m/s compared with 3 m/s, which proved the excellent performance of the mechanical shields. The field trial results were consistent with the CFD simulation, and the relative deviation of the DR between the two was within 4 %, so the accuracy and reliability of the CFD simulation model were proved.","PeriodicalId":237575,"journal":{"name":"Strojniški vestnik","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134914950","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 Logic Approach to Predict Surface Roughness in Powder Mixed Electric Discharge Machining of Titanium Alloy 模糊逻辑法预测钛合金粉末混合电火花加工表面粗糙度

Strojniški vestnik Pub Date : 2023-09-14 DOI: 10.5545/sv-jme.2023.561

Dragan Rodić, Marin Gostimirović, Milenko Sekulić, Borislav Savković, Andjelko Aleksić

{"title":"Fuzzy Logic Approach to Predict Surface Roughness in Powder Mixed Electric Discharge Machining of Titanium Alloy","authors":"Dragan Rodić, Marin Gostimirović, Milenko Sekulić, Borislav Savković, Andjelko Aleksić","doi":"10.5545/sv-jme.2023.561","DOIUrl":"https://doi.org/10.5545/sv-jme.2023.561","url":null,"abstract":"This study deals with fuzzy logic based modeling and parametric analysis in powder mixed electrical discharge machining of titanium alloys. The central composition plan was used to design the experiments considering four parameters, namely discharge current, pulse duration, duty cycle as well as graphite powder concentration. All experiments were performed with different parameter combinations and the performance, i.e., surface roughness, was evaluated. The adaptive neuro-fuzzy inference system was used to understand and define the input-output relationship. The experimental results and the model results were compared and it was found that the results accurately predicted the reactions in the erosion of titanium alloys. In addition, the model was verified using data that had not participated in the training of the model, with an error of about 10%. In addition, a fuzzy plot was used to analyze the influence of input parameters on surface roughness. It was found that the discharge current was the most important influencing parameter. Additional experiments proved the positive effect of graphite powder, which reduced the surface roughness by 27 %.","PeriodicalId":237575,"journal":{"name":"Strojniški vestnik","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134915147","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

Mechanical and Microstructural Properties of B4C/W Reinforced Copper Matrix Composite Using a Friction Stir-Welding Process 摩擦搅拌焊B4C/W增强铜基复合材料的力学和显微组织性能

Strojniški vestnik Pub Date : 2023-09-14 DOI: 10.5545/sv-jme.2023.518

Jamuna Elangandhi, Suresh Periyagounder, Mahalingam Selavaraj, Duraisivam Saminatharaja

{"title":"Mechanical and Microstructural Properties of B4C/W Reinforced Copper Matrix Composite Using a Friction Stir-Welding Process","authors":"Jamuna Elangandhi, Suresh Periyagounder, Mahalingam Selavaraj, Duraisivam Saminatharaja","doi":"10.5545/sv-jme.2023.518","DOIUrl":"https://doi.org/10.5545/sv-jme.2023.518","url":null,"abstract":"Copper metal matrix composites (CMC) are broadly employed in various applications in the fields of space, aviation, automobile and electronics industries. The welding of CMC in using conventional methods is very difficult and expensive due to its crystallographic nature. Friction stir welding (FSW) is a more prominent and reliable technique for welding than conventional methods. Therefore, this work is based on work with CMC material, which is prepared with a stir-casting technique. Pure copper (Cu) is reinforced with tungsten (W) and boron carbide (B4C) particles in different combinations and welded using the FSW process to study the mechanical and micro-structural properties. Multi-objective decision-making methods, such as the technique for order preference by similarity to ideal solution (TOPSIS) and grey relational analysis (GRA) are used to find optimal parameter combination. The experiments are planned according to the L 18 orthogonal array (OA) using the most influential parameters, such as reinforcement the percentage of B4C, tool rotational speed, welding speed, and axial force. The performance of outcomes is measured based on the responses such as tensile strength, hardness, and impact strength of the weld joint. Based on the results 15 % of B4C reinforcement, 900 RPM rotational speed, 15 mm/min welding speed and 6 kN axial forces are optimal for better mechanical strength in the welding with TOPSIS and GRA techniques. Additionally, scanning electron microscopic image (SEM) analyses were carried out for better understanding of weldments’ microstructure changes.","PeriodicalId":237575,"journal":{"name":"Strojniški vestnik","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134915146","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

Optimization of Abrasive Waterjet Cutting by Using the CODAS Method with Regard to Interdependent Processing Parameters 基于相互依赖加工参数的CODAS优化磨料水射流切割

Strojniški vestnik Pub Date : 2023-09-14 DOI: 10.5545/sv-jme.2023.647

Andrzej Perec, Elzbieta Kawecka, Aleksandra Radomska-Zalas, Frank Pude

引用次数: 0

Fuzzy and Matlab/Simulink Modelling of the Air Compression Refrigeration Cycle 空气压缩制冷循环的模糊和Matlab/Simulink建模

Strojniški vestnik Pub Date : 2023-09-14 DOI: 10.5545/sv-jme.2023.597

Amjad Alsakarneh, Lina Momani, Taha Tabaza

引用次数: 0

Research on an Analytical Method for the Forming Force of External Spline Cold Roll-Beating 外花键冷滚打成形力分析方法研究

Strojniški vestnik Pub Date : 2023-09-14 DOI: 10.5545/sv-jme.2023.616

Qun Ma, Xiangwei Zhang

{"title":"Research on an Analytical Method for the Forming Force of External Spline Cold Roll-Beating","authors":"Qun Ma, Xiangwei Zhang","doi":"10.5545/sv-jme.2023.616","DOIUrl":"https://doi.org/10.5545/sv-jme.2023.616","url":null,"abstract":"To determine the force and energy parameters of cold roll-beating of external splines, the characteristics of the deformation zone in cold roll-beating are analysed. The geometric dimensions and position of the deformation zone change with the movement of the roller, the contact arc, and the reduction are very small, and there is an incomplete deformation zone in the initial stage of cold roll-beating. A discrete analytical method for calculating the unit pressure and deformation force is proposed, and the cold roll-beating process is discretized into an infinite number of cold-rolling processes with complex sections. The discrete analytical model of unit pressure and deformation force is established, and the unit pressure value and its distribution characteristics are determined. To verify the discrete analytical model, a finite element model of cold roll-beating is established, and the forming force is calculated. A horizontal milling machine is modified to carry out the cold roll-beating experiment, and the forming force is measured. The predicted results of the discrete analytical model are compared with the simulation and experiment results. The results show that the maximum error of radial force compared with the simulation and experiment results is about 7 % and 4 % respectively, and the variation curve of radial force is basically consistent, but the time of a cold roll-beating process is slightly shorter. The discrete analytical model correctly predicts the magnitude and change process of cold roll-beating forming force.","PeriodicalId":237575,"journal":{"name":"Strojniški vestnik","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134915144","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 Dynamic Behaviour of Symmetrical Laminated Nano-composite Containing Equal Numbers of Glass and Carbon Fibre Layers 含有等量玻璃和碳纤维层的对称层状纳米复合材料的动力学行为

Strojniški vestnik Pub Date : 2023-05-30 DOI: 10.5545/sv-jme.2022.403

Ava A.K. Mohammed, Gailan Ismail Hassan, Younis Khalid Khdir

{"title":"The Dynamic Behaviour of Symmetrical Laminated Nano-composite Containing Equal Numbers of Glass and Carbon Fibre Layers","authors":"Ava A.K. Mohammed, Gailan Ismail Hassan, Younis Khalid Khdir","doi":"10.5545/sv-jme.2022.403","DOIUrl":"https://doi.org/10.5545/sv-jme.2022.403","url":null,"abstract":"Fibre-reinforced polymer composite has many uses in structural components that required high strength, stiffness, and damping capacity. Cross and quasi-laminated epoxy composites with and without nano Al2O3 were used in this investigation to determine flexural modulus, natural frequency, damping ratio, and mode shapes by using analytical, experimental, and numerical (ANSYS) methods. It was demonstrated that adding 2 % nano Al2O3 improved the flexural modulus and the damping ratio while decreased the natural frequency. Cross number 2 and quasi number 2 had the highest natural frequency for cross and quasi laminate groups which are equal to 23.5 Hz and 20.25 Hz experimentally, respectively. On the other hand, the higher damping ratio was achieved for cross number 1 with nano Al2O3 and quasi number 2 with nano Al2O3 for both cross and quasi laminates, which are equal to 0.707 % and 0.693 %, respectively. The flexural modulus and damping ratio are inversely related to each other. However, the novelty in this article is that by adding two glass plies at the outer surface of quasi group laminate the flexural modulus, natural frequency, and damping ratio are increased simultaneously, as in the configurations quasi number 2 and quasi number 2 with nano Al2O3 in comparison with quasi number 1 and quasi number 1 with nano Al2O3.","PeriodicalId":237575,"journal":{"name":"Strojniški vestnik","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135642816","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 Case Study of a Methodological Approach to the Verification of UAV Propeller Performance 无人机螺旋桨性能验证方法的实例研究

Strojniški vestnik Pub Date : 2023-05-30 DOI: 10.5545/sv-jme.2022.432

Goran Vorotović, Jela Burazer, Aleksandar Bengin, Časlav Mitrović, Miloš Januzović, Nebojša Petrović, Djordje Novković

{"title":"A Case Study of a Methodological Approach to the Verification of UAV Propeller Performance","authors":"Goran Vorotović, Jela Burazer, Aleksandar Bengin, Časlav Mitrović, Miloš Januzović, Nebojša Petrović, Djordje Novković","doi":"10.5545/sv-jme.2022.432","DOIUrl":"https://doi.org/10.5545/sv-jme.2022.432","url":null,"abstract":"Understanding the behaviour of propeller-driven aircraft has been the primary goal of aviation since the brothers Orville and Wilbur Wright. Traction characteristics, which have over time become dominant in the field of aviation in addition to thrust, both examined and analysed, nevertheless represent a sort of oxymoron in modern aviation. In this sense, the authors of the paper present the possibilities of static performance characteristics and vibrations of aircraft propellers through the analysis of low-powered aircraft. The use of low-powered aircraft as “expendable” material is the reality we live in, but ensuring the safety of their use is the primary goal of the researchers who deal with this issue. Accordingly, the authors of this paper present indications of the methodology of testing the blades of low-power aircraft in the atmosphere with an observation that the same indications can be used with aircraft of higher power, as well as with the aircraft on celestial bodies that have not been tested or available. A test bench for the quantification of thrust, torque, and vibration of small unmanned aerial vehicles’ (UAV) vehicle propellers is presented. The obtained results realistically describe the complex behaviour of propellers in operation.","PeriodicalId":237575,"journal":{"name":"Strojniški vestnik","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135693134","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

Wear Behaviour of a Cu-Ni-Sn Hybrid Composite Reinforced with B4C prepared by Powder Metallurgy Technique 粉末冶金技术制备B4C增强Cu-Ni-Sn杂化复合材料的磨损性能

Strojniški vestnik Pub Date : 2023-05-30 DOI: 10.5545/sv-jme.2022.423

Haiter Lenin Allasi, Mary Vasanthi Soosaimariyan, Vettivel Singaravel Chidambaranathan

{"title":"Wear Behaviour of a Cu-Ni-Sn Hybrid Composite Reinforced with B4C prepared by Powder Metallurgy Technique","authors":"Haiter Lenin Allasi, Mary Vasanthi Soosaimariyan, Vettivel Singaravel Chidambaranathan","doi":"10.5545/sv-jme.2022.423","DOIUrl":"https://doi.org/10.5545/sv-jme.2022.423","url":null,"abstract":"Cu matrix composites benefit from the high electrical and thermal conductivities of Cu and the mechanical wear/erosion resistance of hard reinforcement. In this study, an attempt has been made to determine the effect of the addition of reinforcement B4C in Cu-Ni-Sn. The B4C is reinforced to form a hybrid Cu matrix composite with powder metallurgy technique. The hybrid composites are obtained by milling, blending, and compacting the powders to obtain a fine grain-sized particle without aggregation. The grain size and particle nature were characterized using scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques, respectively. The microstructure, density, hardness, and wear rate of the composites were studied. The pin-on-disc method is equipped to study the wear behaviour and coefficient of friction. The sintered density of the prepared Cu-15%Ni is 98.25 %, Cu-8%Sn is 98.20 %, Cu-15%Ni-8%Sn is 98.10 % and Cu-15%Ni-8%Sn-2%B4C is 95.26 % and lower specific wear rate has been recorded for Cu-15Ni-8Sn-2B4C 121×10-6 mm3/(Nm) and the addition of reinforcement B4C in Cu-Ni-Sn displays remarkable changes in wear rate and friction coefficient.","PeriodicalId":237575,"journal":{"name":"Strojniški vestnik","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135643594","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

Diffusion Equation Generalized for Modeling of Chladni Patterns 扩散方程在Chladni模式建模中的推广

Strojniški vestnik Pub Date : 2023-05-30 DOI: 10.5545/sv-jme.2022.507

Igor Grabec, Nikolaj Sok

引用次数: 0