Strojnícky časopis - Journal of Mechanical Engineering最新文献

Meshing Characteristics of Profile Shifted Cylindrical Quasi-Involute Arc-Tooth-Trace Gears. Part 2. Calculation Results 齿廓偏移圆柱准渐开线弧齿跟踪齿轮的网格特性。第 2 部分：计算结果计算结果

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0032

P. Tkach, O. Reviakina, Anatolii Kryvosheia, Volodymyr Melnyk, O. Ustynenko, R. Protasov

引用次数: 0

Process Parameters and Conditions of Intensified Composting of Kitchen Biowaste 厨房生物垃圾强化堆肥的工艺参数和条件

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0030

Melissa Sluková, František Dzianik

{"title":"Process Parameters and Conditions of Intensified Composting of Kitchen Biowaste","authors":"Melissa Sluková, František Dzianik","doi":"10.2478/scjme-2023-0030","DOIUrl":"https://doi.org/10.2478/scjme-2023-0030","url":null,"abstract":"Abstract Composting is one of the efficient and effective methods of disposal and recovery of biodegradable waste. A favorable and intensified course of the composting process can be achieved by optimal composition of the composted material (moisture, content of organic substances and nutrients, C:N ratio, etc.), and also by optimizing the conditions under which composting takes place (temperature, pH, structure and aeration of the material, etc.). The paper contains a methodology for calculating the composition of composted material and also a methodology for solving the forced aeration process of composted material. More specifically, some process parameters of the intensified composting of a defined amount of kitchen biowaste, taking place in closed composting reactors, are presented and analyzed. Using the material balance of the composting process, the connections between the desired composition of the matured compost, the composition of the composted material and the conditions under which the composting takes place are pointed out. The specified connections enable the composting process to be optimized appropriately.","PeriodicalId":445896,"journal":{"name":"Strojnícky časopis - Journal of Mechanical Engineering","volume":"4 1","pages":"151 - 162"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139294104","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

CT-Scan-Based Approach for Turbine Blade Geometry Extraction 基于 CT 扫描的涡轮叶片几何形状提取方法

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0017

A. Al-Akam, Ameen M. Al Juboori

引用次数: 0

Analysis of Simply Supported Laminated Composite Plate by Semi Analytical and Finite Element Method for Different Orientation Angles 用半分析和有限元方法分析不同方向角的简支层压复合板

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0021

Choudhury Arnab, Chandra Samar, Sarkar Susenjit, Karmakar Mintu

{"title":"Analysis of Simply Supported Laminated Composite Plate by Semi Analytical and Finite Element Method for Different Orientation Angles","authors":"Choudhury Arnab, Chandra Samar, Sarkar Susenjit, Karmakar Mintu","doi":"10.2478/scjme-2023-0021","DOIUrl":"https://doi.org/10.2478/scjme-2023-0021","url":null,"abstract":"Abstract Deflection of simply supported laminated composite plate under transverse load is found out by semi-analytical method (Classical Lamination Theory) and the results are compared with Finite element method using FEA software ANSYS. The equations developed by classical lamination theory for symmetric angle ply and cross ply laminated plate are solved by Navier and Rayleigh-Ritz method. The efficiency of Navier and Rayleigh-Ritz method in solving the problems of symmetric angle ply and cross ply laminated plate are investigated by comparing their results with ANSYS. Percentage error of the results from finite element method with Navier and Rayleigh-Ritz methods are studied and compared. The model is extended to study the effect of orientation angle, number of lamina and length to thickness ratio on the deflection of simply supported composite plates for symmetric angle ply plates of stacking sequence (orientation angle) of [+θ/− θ]s . From the discussion, it is found that the percentage error depends on the variables: number of lamina, thickness of each lamina, orientation angle and mesh size. The significance of these variables in reducing the percentage error is studied by statistical tool: ANOVA and the relationship between these variables are established by regression equation. Statistical analysis is conducted by testing their significance at the 5% significance level. The comparative study and analysis of the percentage errors of the semi-analytical methods with finite element methods in solving the problem of laminated composite plates is essential to study the degree of approximation in the results.","PeriodicalId":445896,"journal":{"name":"Strojnícky časopis - Journal of Mechanical Engineering","volume":"78 1","pages":"45 - 70"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139302818","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

Flutter Measurement of a Linear Turbine Blade Cascade with an Angular Position Deviation of One Blade 具有一个叶片角位置偏差的线性涡轮叶片级联的飘动测量

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0019

P. Eret, V. Tsymbalyuk, Markus Eckert

引用次数: 0

Effect of Thermal Barriers on the Martensitic Transformation in a Bar Jominy 热障对棒材 Jominy 中马氏体转变的影响

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0028

D. Rezini, Touhami Baki

引用次数: 0

Nonlinear Cell Deformation Model 非线性细胞变形模型

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0026

K. Mendová, M. Otahal, Matej Daniel

引用次数: 0

Scientific Basis for the Substantiation of Process Regulations for the Micro-Cutting of Hardened Gears 淬火齿轮微切削工艺规程的科学依据

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0023

Alexander Klochko, Y. Basova, Magomediemin Gasanov, Alexander Zakovorotny, Vitaly Fedorenko, Oleh Myronenko, B. Vorontsov, Anton Ryazantsev, R. Protasov

{"title":"Scientific Basis for the Substantiation of Process Regulations for the Micro-Cutting of Hardened Gears","authors":"Alexander Klochko, Y. Basova, Magomediemin Gasanov, Alexander Zakovorotny, Vitaly Fedorenko, Oleh Myronenko, B. Vorontsov, Anton Ryazantsev, R. Protasov","doi":"10.2478/scjme-2023-0023","DOIUrl":"https://doi.org/10.2478/scjme-2023-0023","url":null,"abstract":"Abstract The paper considers scientific principles of technological procedure development for the selection and assignment of parameters of velocity machining by blade tool at gear milling with due regard to the required parameters of the gear surface layer. Optimum micro-cutting conditions are determined when full participation in stock removal of all mill teeth is provided. Technological regulation of selection and setting of machining parameters is spread for gear hobbing of the spur gear wheels with fine-modular and coarse-modular hardness (220...320 HV) and after heat treatment (HRC46...63). Correlation with essential parameters of the surface layer, cutting depth, feed, speed and radius of rounding of the cutting edge of milling cutters’ teeth is established. It is scientifically grounded, tested, and proved at what modes of cutting, the radius of rounding of cutting edge of the cutting tool is made metal removal at oncoming and passing high-speed micro milling. The process of determining of minimal sliding angle, or maximum value (without the use of coolant and with coolant), in which there is no micro-cutting process taking into account variation of variable parameters of cutting conditions and geometrical parameters of hobbing cutters is modelled. For the first time, we ascertained the relation between the sliding angle and the maximum contact angle of the mill tooth with the work surface, which allowed determine the efficiency of the shaping process through coefficient (without coolant and with coolant).","PeriodicalId":445896,"journal":{"name":"Strojnícky časopis - Journal of Mechanical Engineering","volume":"37 1","pages":"83 - 92"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139291914","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

Friction Stir Welding Tool Life Assessment Through Fatigue Analysis 通过疲劳分析评估摩擦搅拌焊接工具寿命

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0031

Hanuma Taraka, Pankaj Pardeep, Biswas Pankaj, Deepati Anilkumar, Benjeer Indira, Kumar Aadarsh

{"title":"Friction Stir Welding Tool Life Assessment Through Fatigue Analysis","authors":"Hanuma Taraka, Pankaj Pardeep, Biswas Pankaj, Deepati Anilkumar, Benjeer Indira, Kumar Aadarsh","doi":"10.2478/scjme-2023-0031","DOIUrl":"https://doi.org/10.2478/scjme-2023-0031","url":null,"abstract":"Abstract Friction stir welding is a solid-state joining process used to weld various materials. Tool life is an important consideration when welding strong metals with the Friction stir welding technique (FSW). The current research aims to calculate tool life by mathematical derivation and simulation using ANSYS transient structural analysis. There are two tool materials and five-pin profiles to consider. The calculated tool life using mathematical formulation is within 15% of the simulation outcome. Further changes are made to the simulation to make the tool life estimate more realistic under FSW’s operation. PcBN tool has superior mechanical properties over the tungsten carbide tool, so the procedure started with the tungsten carbide tool. The conical pin profile is giving 31466 cycles of tool life, which is 70 min run time while working at 450 rpm rotational speed. As a result, for high-strength materials joining, the tool must be chosen based on tool life parameters. The addition of a 1.5 mm fillet at the pin-to-shoulder junction has improved the tool life by 1147 cycles. The PcBN tool is simulated with a conical tool with new pin profiles of conical with grooves and cylindrical fillet with grooves. The maximum tool life of 94018 cycles is obtained for the conical PcBN tool.","PeriodicalId":445896,"journal":{"name":"Strojnícky časopis - Journal of Mechanical Engineering","volume":"194 1","pages":"163 - 180"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139297279","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

Device for Transplanting Young Undergrowth with Soil Lump When Performing Forestry 植树造林时带土块移栽林下幼苗的装置

Strojnícky časopis - Journal of Mechanical Engineering Pub Date : 2023-11-01 DOI: 10.2478/scjme-2023-0029

Konstantin P. Rukomojnikov, T. Gilyazova, I. S. Anisimov

引用次数: 0