Pub Date : 2024-03-27DOI: 10.1134/s1052618824010059
Yu. V. Klochkov, V. A. Pshenichkina, A. P. Nikolaev, S. S. Marchenko, O. V. Vakhnina, M. Yu. Klochkov
Abstract
A finite element algorithm in a mixed formulation has been developed to find stresses and displacements occurring in a shell of revolution. The finite discretization element has been taken in the form of a curvilinear quadrangle of the middle shell surface. As the nodal unknowns in the mixed formulation, forces and moments inherent in the middle surface with a bilinear approximation have been used, as have the displacements and their first derivatives in two approximation variants of the sought kinematic quantities in scalar and vector form. By the example of calculations, the efficiency has been shown for the approximation of the sought kinematic quantities as vector fields, and it has been noted that the determination of stresses occurring in shells of revolution made of incompressible materials is quite possible.
{"title":"Calculation of Shells of Revolution with the Use of a Mixed FEM with a Vector Approximation Procedure","authors":"Yu. V. Klochkov, V. A. Pshenichkina, A. P. Nikolaev, S. S. Marchenko, O. V. Vakhnina, M. Yu. Klochkov","doi":"10.1134/s1052618824010059","DOIUrl":"https://doi.org/10.1134/s1052618824010059","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A finite element algorithm in a mixed formulation has been developed to find stresses and displacements occurring in a shell of revolution. The finite discretization element has been taken in the form of a curvilinear quadrangle of the middle shell surface. As the nodal unknowns in the mixed formulation, forces and moments inherent in the middle surface with a bilinear approximation have been used, as have the displacements and their first derivatives in two approximation variants of the sought kinematic quantities in scalar and vector form. By the example of calculations, the efficiency has been shown for the approximation of the sought kinematic quantities as vector fields, and it has been noted that the determination of stresses occurring in shells of revolution made of incompressible materials is quite possible.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311648","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}
Pub Date : 2024-03-27DOI: 10.1134/s1052618824010084
A. I. Nedobitkov, B. M. Abdeyev
Abstract
The results of experimental and theoretical studies of the formation of a crack in a copper conductor under the influence of current overload are presented. The conductor was examined using a JSM-6390L scanning electron microscope. A refined mathematical model of the static stress–strain state and destruction of a copper rod under conditions of inelastic bending at temperatures up to 700°C has been obtained. The limiting values of the bending moment and curvature of the copper conductor, causing its rupture after the formation of a crack, have been determined. The calculation algorithm has been brought to the final analytical dependences, allowing them to be used when conducting forensic fire-technical examination or designing electrical wiring.
{"title":"Model of Static Destruction of a Copper Conductor during Current Overload","authors":"A. I. Nedobitkov, B. M. Abdeyev","doi":"10.1134/s1052618824010084","DOIUrl":"https://doi.org/10.1134/s1052618824010084","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of experimental and theoretical studies of the formation of a crack in a copper conductor under the influence of current overload are presented. The conductor was examined using a JSM-6390L scanning electron microscope. A refined mathematical model of the static stress–strain state and destruction of a copper rod under conditions of inelastic bending at temperatures up to 700°C has been obtained. The limiting values of the bending moment and curvature of the copper conductor, causing its rupture after the formation of a crack, have been determined. The calculation algorithm has been brought to the final analytical dependences, allowing them to be used when conducting forensic fire-technical examination or designing electrical wiring.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316747","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}
Pub Date : 2024-03-27DOI: 10.1134/s1052618824010096
G. S. Sadykhov, S. S. Kudryavtseva
Abstract
Formulas for calculating and estimating the average residual life of nonrestorable technical objects based on the use of censored data on failure-free operating times have been proven. The results obtained can be used in problems of extending the service life of objects. Examples of estimates of the average residual life of objects are given. The average residual life proven estimates are valid for any law of life utilization of nonrenewable technical objects.
{"title":"Assessment of the Average Residual Life of Nonrecoverable Objects Based on Censored Data on Failure-Free Operating Times","authors":"G. S. Sadykhov, S. S. Kudryavtseva","doi":"10.1134/s1052618824010096","DOIUrl":"https://doi.org/10.1134/s1052618824010096","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Formulas for calculating and estimating the average residual life of nonrestorable technical objects based on the use of censored data on failure-free operating times have been proven. The results obtained can be used in problems of extending the service life of objects. Examples of estimates of the average residual life of objects are given. The average residual life proven estimates are valid for any law of life utilization of nonrenewable technical objects.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311525","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}
Pub Date : 2024-03-27DOI: 10.1134/s1052618824010035
A. G. Anisimov, M. E. Ahmed Soliman
Abstract
The article investigated the process of penetration of an aluminum plate by a steel ball at speeds from 600 to 1000 m/s. A numerical simulation of the impact of the ball was carried out and compared with the results of experiments in which the ball was accelerated using a powder accelerator. Numerical models were developed using the explicit finite element method in LS-DYNA software. The influence of material properties and model parameters on the penetration process is analyzed. A good agreement between numerical and experimental results has been achieved.
{"title":"Simulation of the Impact of a Steel Ball on an Aluminum Plate D16 and Comparison with the Experiment","authors":"A. G. Anisimov, M. E. Ahmed Soliman","doi":"10.1134/s1052618824010035","DOIUrl":"https://doi.org/10.1134/s1052618824010035","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article investigated the process of penetration of an aluminum plate by a steel ball at speeds from 600 to 1000 m/s. A numerical simulation of the impact of the ball was carried out and compared with the results of experiments in which the ball was accelerated using a powder accelerator. Numerical models were developed using the explicit finite element method in LS-DYNA software. The influence of material properties and model parameters on the penetration process is analyzed. A good agreement between numerical and experimental results has been achieved.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311520","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}
Pub Date : 2024-03-27DOI: 10.1134/s105261882401014x
L. A. Zhuravleva
Abstract
One of the promising and current trends in the design of wide span sprinkling machines is the principle of resource saving. Trends for improving the design and technological parameters of sprinkling equipment based on the principles of resource conservation are considered, and a concept for the development of sprinkling equipment based on operating conditions is formed. The research carried out made it possible to improve the truss structures of the KASKAD model range of sprinkling machines. The reduction in material consumption is based on optimizing the parameters of spans and truss structures, for which coefficients of metal consumption of the truss and the weight of angles were proposed. Improvement of the truss structure made it possible to increase the span length by 22.1–33.8% with a slight increase in mass by 5.8–15.1%.
{"title":"Design Features of Wide Span Sprinkling Machines","authors":"L. A. Zhuravleva","doi":"10.1134/s105261882401014x","DOIUrl":"https://doi.org/10.1134/s105261882401014x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>One of the promising and current trends in the design of wide span sprinkling machines is the principle of resource saving. Trends for improving the design and technological parameters of sprinkling equipment based on the principles of resource conservation are considered, and a concept for the development of sprinkling equipment based on operating conditions is formed. The research carried out made it possible to improve the truss structures of the KASKAD model range of sprinkling machines. The reduction in material consumption is based on optimizing the parameters of spans and truss structures, for which coefficients of metal consumption of the truss and the weight of angles were proposed. Improvement of the truss structure made it possible to increase the span length by 22.1–33.8% with a slight increase in mass by 5.8–15.1%.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311529","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}
Pub Date : 2024-03-27DOI: 10.1134/s1052618824010126
N. I. Sidnyaev, E. Battulga
Abstract
It is shown that changes in conditions during an experiment can go unnoticed and how anomalous measurements arise that can lead to incorrect values containing gross errors. It is interpreted that distortion of measurements may be a consequence of incorrect operation of recording devices; if a fault is detected, such values should be discarded. The problems of the uncertainty of information on input data in calculations using classical methods are outlined. The influence of the deviation of external impacts from nominal values, variability of emission intensity, and the nonlinear nature of influence of external factors on the probability of an event were studied.
{"title":"Methodology for Introducing Corrections in Statistical Studies Based on Control Charts","authors":"N. I. Sidnyaev, E. Battulga","doi":"10.1134/s1052618824010126","DOIUrl":"https://doi.org/10.1134/s1052618824010126","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>It is shown that changes in conditions during an experiment can go unnoticed and how anomalous measurements arise that can lead to incorrect values containing gross errors. It is interpreted that distortion of measurements may be a consequence of incorrect operation of recording devices; if a fault is detected, such values should be discarded. The problems of the uncertainty of information on input data in calculations using classical methods are outlined. The influence of the deviation of external impacts from nominal values, variability of emission intensity, and the nonlinear nature of influence of external factors on the probability of an event were studied.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311646","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}
Pub Date : 2024-03-27DOI: 10.1134/s1052618824010072
V. P. Lyalyakin, V. F. Aulov, A. V. Ishkov, I. N. Kravchenko, Yu. N. Rozhkov
Abstract
The results of an analysis of the wear of a combine harvester chopper knives are presented. It is established that the maximum wear of blades is 225 hectares of harvested area, after which they should be replaced. The effectiveness of methods for blade hardening is assessed. Using changes in the hardness and microhardness of metallographic and X-ray phase analysis, the optimal blade hardening method is determined.
摘要 介绍了对联合收割机切碎刀磨损情况的分析结果。结果表明，刀片的最大磨损量为 225 公顷的收割面积，之后应更换刀片。评估了刀片硬化方法的有效性。通过金相分析和 X 射线相分析的硬度和显微硬度变化，确定了最佳刀片淬火方法。
{"title":"Study of Wear Resistance of Harvester Knives during Operation and Evaluation of Effective Methods for Hardening","authors":"V. P. Lyalyakin, V. F. Aulov, A. V. Ishkov, I. N. Kravchenko, Yu. N. Rozhkov","doi":"10.1134/s1052618824010072","DOIUrl":"https://doi.org/10.1134/s1052618824010072","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of an analysis of the wear of a combine harvester chopper knives are presented. It is established that the maximum wear of blades is 225 hectares of harvested area, after which they should be replaced. The effectiveness of methods for blade hardening is assessed. Using changes in the hardness and microhardness of metallographic and X-ray phase analysis, the optimal blade hardening method is determined.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311442","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}
Pub Date : 2024-03-27DOI: 10.1134/s1052618824010060
O. I. Kosarev
Abstract
Variants for complete damping of the scattered and diffraction sound field of a cylindrical shell are considered, and calculation results obtained for the diffraction field damping are presented.
摘要 考虑了圆柱形壳体散射声场和衍射声场完全阻尼的变量，并给出了衍射声场阻尼的计算结果。
{"title":"The Problem of Complete Damping of a Diffraction Sound Field for a Cylindrical Shell","authors":"O. I. Kosarev","doi":"10.1134/s1052618824010060","DOIUrl":"https://doi.org/10.1134/s1052618824010060","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Variants for complete damping of the scattered and diffraction sound field of a cylindrical shell are considered, and calculation results obtained for the diffraction field damping are presented.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311443","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}
Pub Date : 2024-03-27DOI: 10.1134/s1052618824010138
P. P. Udalov, I. A. Popov, A. V. Lukin, L. V. Shtukin, K. V. Poletkin
Abstract
In the article the parametric oscillations of an unreformed disk located in a contactless electromagnetic suspension with an electrostatic loop of the effective control stiffness were investigated analytically. The analytical expressions for the transition curves of the stationary position of the levitated object were obtained based on the asymptotical method of nonlinear dynamics for the areas of the main and secondary parametric resonances. The system parameters were estimated for which the contactless suspension with quasi-zero electromagnetic stiffness is asymptotically stable.
{"title":"Parametric Stability of Microscale Contactless Inductive Suspension with an Electrostatic Control Loop of Stiffness","authors":"P. P. Udalov, I. A. Popov, A. V. Lukin, L. V. Shtukin, K. V. Poletkin","doi":"10.1134/s1052618824010138","DOIUrl":"https://doi.org/10.1134/s1052618824010138","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In the article the parametric oscillations of an unreformed disk located in a contactless electromagnetic suspension with an electrostatic loop of the effective control stiffness were investigated analytically. The analytical expressions for the transition curves of the stationary position of the levitated object were obtained based on the asymptotical method of nonlinear dynamics for the areas of the main and secondary parametric resonances. The system parameters were estimated for which the contactless suspension with quasi-zero electromagnetic stiffness is asymptotically stable.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311519","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}
Pub Date : 2024-02-08DOI: 10.1134/s1052618823100023
A. Yu. Albagachiev, B. M. Gantimirov
Abstract
Based on the solution of the Fourier heat equations in partial derivatives, analytical models to calculate temperature during friction and impact are derived. The calculations performed demonstrated the adequacy of the models for the experimental data. Models of the coefficient for sharing the heat flow are reviewed.
{"title":"Thermophysical Models of Temperature during Friction and Impact","authors":"A. Yu. Albagachiev, B. M. Gantimirov","doi":"10.1134/s1052618823100023","DOIUrl":"https://doi.org/10.1134/s1052618823100023","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Based on the solution of the Fourier heat equations in partial derivatives, analytical models to calculate temperature during friction and impact are derived. The calculations performed demonstrated the adequacy of the models for the experimental data. Models of the coefficient for sharing the heat flow are reviewed.</p>","PeriodicalId":642,"journal":{"name":"Journal of Machinery Manufacture and Reliability","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752037","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号