The Journal of Zhytomyr State Technological University. Series: Engineering最新文献

{"title":"Comparative analysis of time series forecasting models effectiveness by means of a multi-criteria procedure on the example of financial indicators","authors":"Олег Григорович Байбуз, Анастасія Олегівна Долгіх","doi":"10.26642/tn-2019-1(83)-130-141","DOIUrl":"https://doi.org/10.26642/tn-2019-1(83)-130-141","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133496261","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}

{"title":"Boundary element method for fracture mechanics analysis of 3d non-planar cracks in anisotropic solids","authors":"N. Ilchuk, I. Pasternak","doi":"10.26642/tn-2019-1(83)-59-68","DOIUrl":"https://doi.org/10.26642/tn-2019-1(83)-59-68","url":null,"abstract":"Among the numerical approaches to fracture mechanics analysis of cracked anisotropic solids, the boundary element method is notable for high accuracy and performance due to its semi-analytical nature and the use of only boundary mesh. Various boundary element techniques were proposed for 3D fracture mechanics analysis. However, the main problem of these approaches is the treatment of singular and hypersingular integrals, which can demand analytic evaluation of coefficient at kernel singularity at singular point in local curvilinear coordinates, which produce cumbersome equations in the case of non-planar geometries. Therefore, the paper presents novel formulation of the boundary element method for 3D fracture mechanics analysis of anisotropic solids with non-planar cracks. Pan’s single domain boundary element formulation is extended with several novelties, which allow accurate analysis of non-planar geometries. These are modified Kutt’s numerical quadratures with Chebyshev nodes for accurate evaluation of singular and hypersingular integrals; polynomial mappings for smoothing the integrand at the crack front line; and special shape functions, which account for a square-root stress singularity at crack front and allow accurate determination of stress intensity factors. The kernels of boundary integral equations are evaluated using the exponentially convergent quadrature, which allows derivation of fast boundary element technique. The procedure for accurate numerical determination of stress intensity factors at arbitrary point of the crack front is also developed. Numerical examples are presented, which show high accuracy of the proposed boundary element method. It is shown that non-planar cracks exhibit shearing mode opening along with normal one due to its geometry and direction of the applied loading. Present approach can be combined with Sih’s strain energy density criterion to study 3D cracks propagation in anisotropic elastic solids under fatigue loading, which is the direction of future research.","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123257357","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}

{"title":"Discrete mathematical model of extruder with varied power capacities of heaters and dynamic of polymer phase distribution","authors":"Андрій Олександрович Данькевич, Анатолій Іванович Жученко","doi":"10.26642/tn-2019-1(83)-98-106","DOIUrl":"https://doi.org/10.26642/tn-2019-1(83)-98-106","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127512187","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}

{"title":"The model of carbon raw material heat treatment in electric calciner","authors":"Олексій Анатолійович Жученко, Микола Григорович Хібеба","doi":"10.26642/tn-2019-1(83)-107-114","DOIUrl":"https://doi.org/10.26642/tn-2019-1(83)-107-114","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130324223","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}

{"title":"Assessment of the impact of high temperature on the facing stone from hard rocks","authors":"Валентин Вацлавович Коробійчук, Володимир Ігорович Шамрай, Олександр Миколайович Сидоров, Сергій Олександрович Заруцький","doi":"10.26642/tn-2019-1(83)-253-261","DOIUrl":"https://doi.org/10.26642/tn-2019-1(83)-253-261","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"48 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132025867","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}

{"title":"Evaluation and improvement of town-coupled quality of vehicle based on the application target function connecting electrical and mechanical characteristics","authors":"Юрай Герлици, Екатерина Александровна Кравченко, Владимир Хаусер, Николай Иванович Горбунов, Александр Петрович Кравченко, Светлана Юрьевна Сапронова, Виктор Петрович Ткаченко","doi":"10.26642/TN-2018-2(82)-39-46","DOIUrl":"https://doi.org/10.26642/TN-2018-2(82)-39-46","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115372004","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}

{"title":"The influence of moisture on the colour characteristics of natural stone","authors":"V. Korobiichuk, R. Sobolevskyi, O. Sydorov, V. Shamrai, V. Shlapak","doi":"10.26642/tn-2018-2(82)-241-246","DOIUrl":"https://doi.org/10.26642/tn-2018-2(82)-241-246","url":null,"abstract":"The objects of the research are the facing elements of buildings and architectural monuments. The subject of the study is the process of changing the colour of the decorative stone from moisture. To solve the problems of analyzing the appearance of the surface, it is necessary to form a digital image of the surface of the facing stone and perform its processing by means of modern computer technology. Natural stone darkens in places where there is moisture in the pores. The paper investigated the component L, which is responsible for the lightness in the Lab colour system , the study was conducted on samples with a length of 600 mm and a width of 300 mm with a thickness of 24, 25, 31, 32 mm. To determine the humidity of the samples Hydro Condtrol device was used; it is based on the dielcometric method of measuring the humidity. After 100 hours of exposure to moisture at Pokostivsky granodiorite, the reduction of component L, which is responsible for the lightness in the Lab colour system, actually stops. There is a directly proportional dependence of the height of moisture rise in the samples of natural stone on their thickness, which is associated with an increase in the number of pores that participate in the liquid transfer process. With increasing duration of exposure to moisture at Pokostivsky granodiorite the moisture of the sample surface increases, which can be predicted in the general case and for different values of the thickness of the samples using analytical expressions. Comparison of intensity of value change of components L, which is responsible for the lightness in the Lab colour system and surface moisture of the samples, allows to draw a conclusion about the absence of an explicit connection between the above-mentioned processes.","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115219531","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}

{"title":"Impact on the engine power of a wheeled vehicle mechanical losses when the cylinders are disconnected","authors":"Андрій Олександрович Молодан","doi":"10.26642/tn-2018-2(82)-105-110","DOIUrl":"https://doi.org/10.26642/tn-2018-2(82)-105-110","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122796128","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}

{"title":"Implementation and research of the algorithm of cryptographic protection of data with the public key based on the neural network","authors":"Сергій Іванович Бондарчук, Вікторія Наумівна Ковальчук, Андрій Михайлович Ковальчук, Андрій Анатолійович Єфіменко","doi":"10.26642/TN-2018-2(82)-195-203","DOIUrl":"https://doi.org/10.26642/TN-2018-2(82)-195-203","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132800590","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}

{"title":"Results of experimental research of moving sprung mass to lateral stability of vehicle","authors":"Андрій Леонідович Башинський, Сергій Анатолійович Осташевський, Павло Михайлович Малахов","doi":"10.26642/TN-2018-2(82)-11-20","DOIUrl":"https://doi.org/10.26642/TN-2018-2(82)-11-20","url":null,"abstract":"","PeriodicalId":193229,"journal":{"name":"The Journal of Zhytomyr State Technological University. Series: Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122085053","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}