Pub Date : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-145-151
E. Balashova, A. Frumen
Object and purpose of research. The study is focused on problems of extraction of ferromanganese nodules from the bottom of the World Ocean. This extraction is still insignificant and amounts to no more than 2% of the value of ores mined on land, but its potential is disproportionately large. Of great interest is the deep-water zone of the Clarion- Clipperton faults, where one of the largest deposits of ferromanganese nodules has been registered. For many years, the development of deep-sea deposits of such nodules was considered a low-profit and complex process, but recently the position of researchers has been changing. To increase profitability, it is required to minimize the number of dives and, consequently, to have large-sized hull structures. Main results. To solve this problem, the design of the hull of the underwater vehicle according to the type of the so-called polyhull is proposed. Its main idea is related to the fact that for reinforced cylindrical shells of large diameter, the cylindrical shape of the body is not effective due to technological (in thickness) and strength limitations. The polyhull, whose diameter is not less than 20 m, contains at least 12 modules with a diameter of 2–4 m. The modules are connected by double stringers, web frames and transitional airlocks. The modules are intended to serve as an energy module, a high-pressure tank, an accommodation module, floats, a preparation and processing plant, a warehouse and a repair base for mining robotics, a rescue module, etc. The proposed design solutions can also be used to lift large-sized sunken objects. Conclusion. Research in this area is increasingly becoming the prerogative of governments, because, on the one hand, they require a large amount of capital investment, and, on the other hand, metals found in nodules are constantly becoming more expensive. The development of new technologies stimulates the technological development of the entire industry and opens up new prospects for the economic system.
{"title":"Conceptual problems of the organization of cost-effective development and extraction of ferromanganese nodules from the bottom of the World Ocean","authors":"E. Balashova, A. Frumen","doi":"10.24937/2542-2324-2022-3-401-145-151","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-145-151","url":null,"abstract":"Object and purpose of research. The study is focused on problems of extraction of ferromanganese nodules from the bottom of the World Ocean. This extraction is still insignificant and amounts to no more than 2% of the value of ores mined on land, but its potential is disproportionately large. Of great interest is the deep-water zone of the Clarion- Clipperton faults, where one of the largest deposits of ferromanganese nodules has been registered. For many years, the development of deep-sea deposits of such nodules was considered a low-profit and complex process, but recently the position of researchers has been changing. To increase profitability, it is required to minimize the number of dives and, consequently, to have large-sized hull structures. Main results. To solve this problem, the design of the hull of the underwater vehicle according to the type of the so-called polyhull is proposed. Its main idea is related to the fact that for reinforced cylindrical shells of large diameter, the cylindrical shape of the body is not effective due to technological (in thickness) and strength limitations. The polyhull, whose diameter is not less than 20 m, contains at least 12 modules with a diameter of 2–4 m. The modules are connected by double stringers, web frames and transitional airlocks. The modules are intended to serve as an energy module, a high-pressure tank, an accommodation module, floats, a preparation and processing plant, a warehouse and a repair base for mining robotics, a rescue module, etc. The proposed design solutions can also be used to lift large-sized sunken objects. Conclusion. Research in this area is increasingly becoming the prerogative of governments, because, on the one hand, they require a large amount of capital investment, and, on the other hand, metals found in nodules are constantly becoming more expensive. The development of new technologies stimulates the technological development of the entire industry and opens up new prospects for the economic system.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41342957","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-116-120
M.U. Semenov, G. Tsitsikyan, P. Bobrovnikov
Object and purpose of research. Soft start devices (SSD) are designed for autonomous electric power systems to prevent in-rush currents caused by saturation of magnetic circuit of power transformers and frequency converters capacitors charge. Materials and methods. A graphical description of the process is given, accompanied by in-rush currents upon switch-on, and a circuit design, on the basis of which a soft start is carried out for transformers of the main switchgear (MSG). Main results. Schematic diagrams and design documentation of the SSD have been developed, the internal view of the device in as-delivered configuration is given. Conclusion. The SSD device has passed acceptance tests and is ready for delivery for further operation.
{"title":"Soft start device for electric propulsion system","authors":"M.U. Semenov, G. Tsitsikyan, P. Bobrovnikov","doi":"10.24937/2542-2324-2022-3-401-116-120","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-116-120","url":null,"abstract":"Object and purpose of research. Soft start devices (SSD) are designed for autonomous electric power systems to prevent in-rush currents caused by saturation of magnetic circuit of power transformers and frequency converters capacitors charge. Materials and methods. A graphical description of the process is given, accompanied by in-rush currents upon switch-on, and a circuit design, on the basis of which a soft start is carried out for transformers of the main switchgear (MSG). Main results. Schematic diagrams and design documentation of the SSD have been developed, the internal view of the device in as-delivered configuration is given. Conclusion. The SSD device has passed acceptance tests and is ready for delivery for further operation.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41813418","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-28-38
A. Kuznetsova, A. Taranov
Object and purpose of research. The objects of research are models of propeller and impeller of a water jet. The purpose of the work is to validate the new calculation module LOGOS of domestic software complex for engineering analysis and the technology for its use in predicting the hydrodynamic performance of ship propulsion based on comparison with experimental research data and reference calculations in foreign commercial software. Materials and methods. Methods of computational fluid dynamics are used to determine the hydrodynamic performance of ship propulsion systems. The characteristics of the viscous fluid flow are obtained from the solution of non-stationary Reynolds equations (RANS (Reynolds averaged Navier-Stokes equations)) by control volume method. The Reynolds equations are closed by a two-parameter semi-empirical turbulence model. To validate the results of numerical modeling in the LOGOS software package, data from experimental studies and reference calculations performed at the Krylov Center are used. Main results. Validation of the new calculation module of LOGOS software complex, performed on the basis of comparison with the results of experimental studies and reference calculations, demonstrates the high accuracy of modern domestic software in the field of computational fluid dynamics in solving problems of determining the hydrodynamic performance of propellers. Conclusion. The paper shows that the determination of hydrodynamic performance of ship propulsion models in a uniform viscous fluid flow can be performed using the domestic software package LOGOS. The accuracy of predicting the hydrodynamic performance of propellers in the meantime compares favourably to leading foreign software products and is confirmed by the results of experimental studies carried out in the deepwater towing tank of Krylov Center. At the same time, further development of the LOGOS software package is required for the correct solution of more complex tasks related to ship propulsion.
{"title":"Validation of prediction technology of ship propulsion hydrodynamic performance in LOGOS software package","authors":"A. Kuznetsova, A. Taranov","doi":"10.24937/2542-2324-2022-3-401-28-38","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-28-38","url":null,"abstract":"Object and purpose of research. The objects of research are models of propeller and impeller of a water jet. The purpose of the work is to validate the new calculation module LOGOS of domestic software complex for engineering analysis and the technology for its use in predicting the hydrodynamic performance of ship propulsion based on comparison with experimental research data and reference calculations in foreign commercial software. Materials and methods. Methods of computational fluid dynamics are used to determine the hydrodynamic performance of ship propulsion systems. The characteristics of the viscous fluid flow are obtained from the solution of non-stationary Reynolds equations (RANS (Reynolds averaged Navier-Stokes equations)) by control volume method. The Reynolds equations are closed by a two-parameter semi-empirical turbulence model. To validate the results of numerical modeling in the LOGOS software package, data from experimental studies and reference calculations performed at the Krylov Center are used. Main results. Validation of the new calculation module of LOGOS software complex, performed on the basis of comparison with the results of experimental studies and reference calculations, demonstrates the high accuracy of modern domestic software in the field of computational fluid dynamics in solving problems of determining the hydrodynamic performance of propellers. Conclusion. The paper shows that the determination of hydrodynamic performance of ship propulsion models in a uniform viscous fluid flow can be performed using the domestic software package LOGOS. The accuracy of predicting the hydrodynamic performance of propellers in the meantime compares favourably to leading foreign software products and is confirmed by the results of experimental studies carried out in the deepwater towing tank of Krylov Center. At the same time, further development of the LOGOS software package is required for the correct solution of more complex tasks related to ship propulsion.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47035105","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-128-138
N.V. Zharkikh, V. Tarovik
Object and purpose of research. This paper is a part of efforts to draft a Russian Federation national standard (Standard), including general description of the man-made underwater noise radiated from marine vessels, oil & gas production platforms and port infrastructure facilities. Materials and methods. The paper is concerned with the sources of underwater noise radiated in the process of marine industry and transportation activities across the Northern Sea Route and other Russian seas. Information about underwater radiated noise, including ice conditions, is based on the analysis of publications and mass media data on this subject, as well as experience of Krylov Centre researchers. Main results. Primary sources of man-made underwater noise radiated from marine vessels, oil & gas production platforms and port infrastructure are assessed. The results are intended to be used for preparation of a draft Standard for regulating the man-made noise across Russian seas. Conclusion. The technical description of marine structures given in the paper makes it possible to identify main vectors of standardization for their underwater noise parameters.
{"title":"Main sources of underwater noise from marine vessels, oil & gas production platforms and port infrastructure facilities","authors":"N.V. Zharkikh, V. Tarovik","doi":"10.24937/2542-2324-2022-3-401-128-138","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-128-138","url":null,"abstract":"Object and purpose of research. This paper is a part of efforts to draft a Russian Federation national standard (Standard), including general description of the man-made underwater noise radiated from marine vessels, oil & gas production platforms and port infrastructure facilities. Materials and methods. The paper is concerned with the sources of underwater noise radiated in the process of marine industry and transportation activities across the Northern Sea Route and other Russian seas. Information about underwater radiated noise, including ice conditions, is based on the analysis of publications and mass media data on this subject, as well as experience of Krylov Centre researchers. Main results. Primary sources of man-made underwater noise radiated from marine vessels, oil & gas production platforms and port infrastructure are assessed. The results are intended to be used for preparation of a draft Standard for regulating the man-made noise across Russian seas. Conclusion. The technical description of marine structures given in the paper makes it possible to identify main vectors of standardization for their underwater noise parameters.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47528175","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-83-102
A. Shtoda
Object and purpose of research. The objective of the study are modern technical solutions for removal of air masses penetrating into the pipelines of ballast systems of floating docks used in shipbuilding. The purpose of the paper is to determine the effectiveness of various design solutions and special devices used in the process of design, construction and operation of floating docks by modeling the separation processes of aerated spatial flows in pumping chambers and collectors of ballast systems in experimental installation. Materials and methods. Official information materials in the field of science and technology in the area of analytical and experimental studies of air removal processes in marine systems. Methodology of fluid mechanics, methods of dimension theory, experimental methods. Main results. Achievements in the field of design, construction and operation of ballast systems for floating docks and floating drilling rigs, as well as in hydraulic structures were considered. To control the processes of separation and removal of air penetrating into suction pipelines, tests of a number of special technical solutions used in ballast systems of floating structures were carried out on an experimental hydraulic installation using modifiable models according to the developed program and methodology. In connection with the well-known continuing problem of prolonging the operation of ballast pumps at the final stages of deballasting of floating dock compartments, an experimental assessment of the ingenuity and progressiveness of a number of layout design solutions used in the water ducts of pumping compartments of floating docks was carried out. In ballast systems, imperfections of internal devices in collecting pipelines-collectors and pumping chambers were manifested, due to the hydromechanical phenomena of the interaction of two-phase flows in an enclosed confined space. The current state of the art is characterized by the insufficient level of knowledge of flows in the conditions under consideration governing the development of the objects under study at the present stage. The main patterns of excessively aerated flows behaviour in conditions of ballast system ducts in pumping compartment with physical parameters set, according to the specifications, for the standard pumping equipment used in the systems, are revealed. The performed studies fill in the missing information about the behaviour and interaction of aerated flows inside collectors and pumping chambers of various structural designs. The characteristic significant reasons hindering the optimization of the ongoing separation processes are identified, promising design directions for improving the applied ballast systems are identified. Conclusion. The achieved results of the development allow us to make rational decisions about the use of a specific type of equipment and outfit in certain operating conditions as part of ballast systems of floating docks and other floating structure
{"title":"Studies on air removal processes from pipelines of floating docks ballast systems","authors":"A. Shtoda","doi":"10.24937/2542-2324-2022-3-401-83-102","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-83-102","url":null,"abstract":"Object and purpose of research. The objective of the study are modern technical solutions for removal of air masses penetrating into the pipelines of ballast systems of floating docks used in shipbuilding. The purpose of the paper is to determine the effectiveness of various design solutions and special devices used in the process of design, construction and operation of floating docks by modeling the separation processes of aerated spatial flows in pumping chambers and collectors of ballast systems in experimental installation. Materials and methods. Official information materials in the field of science and technology in the area of analytical and experimental studies of air removal processes in marine systems. Methodology of fluid mechanics, methods of dimension theory, experimental methods. Main results. Achievements in the field of design, construction and operation of ballast systems for floating docks and floating drilling rigs, as well as in hydraulic structures were considered. To control the processes of separation and removal of air penetrating into suction pipelines, tests of a number of special technical solutions used in ballast systems of floating structures were carried out on an experimental hydraulic installation using modifiable models according to the developed program and methodology. In connection with the well-known continuing problem of prolonging the operation of ballast pumps at the final stages of deballasting of floating dock compartments, an experimental assessment of the ingenuity and progressiveness of a number of layout design solutions used in the water ducts of pumping compartments of floating docks was carried out. In ballast systems, imperfections of internal devices in collecting pipelines-collectors and pumping chambers were manifested, due to the hydromechanical phenomena of the interaction of two-phase flows in an enclosed confined space. The current state of the art is characterized by the insufficient level of knowledge of flows in the conditions under consideration governing the development of the objects under study at the present stage. The main patterns of excessively aerated flows behaviour in conditions of ballast system ducts in pumping compartment with physical parameters set, according to the specifications, for the standard pumping equipment used in the systems, are revealed. The performed studies fill in the missing information about the behaviour and interaction of aerated flows inside collectors and pumping chambers of various structural designs. The characteristic significant reasons hindering the optimization of the ongoing separation processes are identified, promising design directions for improving the applied ballast systems are identified. Conclusion. The achieved results of the development allow us to make rational decisions about the use of a specific type of equipment and outfit in certain operating conditions as part of ballast systems of floating docks and other floating structure","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47072757","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-71-82
A. Dobrodeev, K. Sazonov
Object and purpose of research. Object of the study is the analysis of aft shape effect of modern heavy-tonnage ships on ice performance indices when moving astern. The purpose of the work is to identify additional specific factors that affect the performance of ice performance when moving stern first, which are usually not taken into account when considering moving ahead. Materials and methods. Material for the development are provided by the data from model experiments results, as well as previously published works devoted to the study of the ship's stern-first movement in ice. Main results. Models tests results of large capacity ice-going ships models moving stern first in an ice basin are analyzed. The phenomena of stern interaction with the ice cover in comparison with the mode of bow first movement are identified and discussed. Approximate estimates are done of the size of ice fragments formed when large capacity ships are moving astern. The obtained results create prerequisites for the development of a methodology for designing large capacity ships with increased ice-going capability. Conclusion. Analysis of heavy-tonnage vessel interaction with ice when sailing astern was carried out based on model tests in the ice basin. It was concluded that in order to develop the calculation procedure for ice resistance when the ship is sailing astern, it is necessary to elaborate new criteria for describing the main components of the ship hull lines and peculiarities of hull interaction with ice.
{"title":"Aft shape effects of modern heavy-tonnage ships on ice performance when moving astern","authors":"A. Dobrodeev, K. Sazonov","doi":"10.24937/2542-2324-2022-3-401-71-82","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-71-82","url":null,"abstract":"Object and purpose of research. Object of the study is the analysis of aft shape effect of modern heavy-tonnage ships on ice performance indices when moving astern. The purpose of the work is to identify additional specific factors that affect the performance of ice performance when moving stern first, which are usually not taken into account when considering moving ahead. Materials and methods. Material for the development are provided by the data from model experiments results, as well as previously published works devoted to the study of the ship's stern-first movement in ice. Main results. Models tests results of large capacity ice-going ships models moving stern first in an ice basin are analyzed. The phenomena of stern interaction with the ice cover in comparison with the mode of bow first movement are identified and discussed. Approximate estimates are done of the size of ice fragments formed when large capacity ships are moving astern. The obtained results create prerequisites for the development of a methodology for designing large capacity ships with increased ice-going capability. Conclusion. Analysis of heavy-tonnage vessel interaction with ice when sailing astern was carried out based on model tests in the ice basin. It was concluded that in order to develop the calculation procedure for ice resistance when the ship is sailing astern, it is necessary to elaborate new criteria for describing the main components of the ship hull lines and peculiarities of hull interaction with ice.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68974758","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-19-27
S.A. Аleksandrov, G. Kanevsky
Object and purpose of research. The object of investigation is the scale effect on propulsion performance of modern cargo/passenger vessels. The purpose is to estimate the scale effect on propulsion performance of a twin-shaft cargo/passenger vessel (CPV). Materials and methods. A method is suggested for predicting the ship propulsion performance based on model test data. This method works for single- and twin-shaft vessels. Main results. The method suggested for ship performance prediction based on model tests is shown to have a similar quality as compared to the best techniques for performance prediction of single-shaft ships. Application of this method to twin-shaft vessels does not lead to paradox situations. Propulsion performance of twin-shaft CPV are calculated using this technique. Conclusion. Inclusion of the scale effect on propulsion performance of a twin-shaft CPV with bossings for propellers does not cause any changes in the predicted speed.
{"title":"Investigation of scale effect on hydrodynamic characteristics and propulsion performance of twin-shaft cargo/passenger vessel","authors":"S.A. Аleksandrov, G. Kanevsky","doi":"10.24937/2542-2324-2022-3-401-19-27","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-19-27","url":null,"abstract":"Object and purpose of research. The object of investigation is the scale effect on propulsion performance of modern cargo/passenger vessels. The purpose is to estimate the scale effect on propulsion performance of a twin-shaft cargo/passenger vessel (CPV). Materials and methods. A method is suggested for predicting the ship propulsion performance based on model test data. This method works for single- and twin-shaft vessels. Main results. The method suggested for ship performance prediction based on model tests is shown to have a similar quality as compared to the best techniques for performance prediction of single-shaft ships. Application of this method to twin-shaft vessels does not lead to paradox situations. Propulsion performance of twin-shaft CPV are calculated using this technique. Conclusion. Inclusion of the scale effect on propulsion performance of a twin-shaft CPV with bossings for propellers does not cause any changes in the predicted speed.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43754315","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-47-51
V. Bagrintsev, N. Marinich, А.A. Koval
Object and purpose of research. Effects of the vane hub cap are investigated regarding hydrodynamic, cavitation and acoustic performance of a ducted propeller as propulsion system. Materials and methods. In the work process two versions of the vane hub cap have been designed to take account of the wake field behind propeller. Experimental investigations of the propulsion system model with a smooth hub cap and designed hub cap are given. Additionally, positions of hub cap vanes with respect to propeller blades (in-between the blades or in wake of the blades) were studied. Main results. The thrust and torque coefficients as well as cavitation numbers were obtained, and the acoustic radiation was measured for the investigated propulsion system arrangements. Conclusion. Comparisons were made and conclusions drawn regarding the efficiency of vane hub cap application.
{"title":"Effect of vane hub cap on hydrodynamic, cavitation and acoustic performance of propulsion system","authors":"V. Bagrintsev, N. Marinich, А.A. Koval","doi":"10.24937/2542-2324-2022-3-401-47-51","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-47-51","url":null,"abstract":"Object and purpose of research. Effects of the vane hub cap are investigated regarding hydrodynamic, cavitation and acoustic performance of a ducted propeller as propulsion system. Materials and methods. In the work process two versions of the vane hub cap have been designed to take account of the wake field behind propeller. Experimental investigations of the propulsion system model with a smooth hub cap and designed hub cap are given. Additionally, positions of hub cap vanes with respect to propeller blades (in-between the blades or in wake of the blades) were studied. Main results. The thrust and torque coefficients as well as cavitation numbers were obtained, and the acoustic radiation was measured for the investigated propulsion system arrangements. Conclusion. Comparisons were made and conclusions drawn regarding the efficiency of vane hub cap application.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49061191","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-139-144
A. Kleschev
Object and purpose of research. The article studies the behavior of anisotropic elastic bodies of cylindrical shape (orthotropic shell and transversely isotropic rod). The intention is to find the phase velocities of elastic waves in these bodies using thin shell approximations and a rigorous approach based on the dynamic theory of elasticity using "Debye type" potentials. In previous studies of anisotropic structures, anisotropic media or anisotropic half-spaces were used. Materials and methods. Both an approximate thin shell method and a rigorous approach based on the dynamic theory of elasticity and "Debye type" potentials are used in the paper. Main results. Equations for finding the phase velocities of elastic waves in anisotropic cylindrical bodies are obtained. Phase velocities of longitudinal and bending waves in anisotropic cylindrical rod are calculated. Conclusion. As a result of the conducted research relations for calculating the phase velocities of elastic waves in an orthotropic shell and a transversely isotropic rod were found.
{"title":"Anisotropic solid cylindrical waveguides","authors":"A. Kleschev","doi":"10.24937/2542-2324-2022-3-401-139-144","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-139-144","url":null,"abstract":"Object and purpose of research. The article studies the behavior of anisotropic elastic bodies of cylindrical shape (orthotropic shell and transversely isotropic rod). The intention is to find the phase velocities of elastic waves in these bodies using thin shell approximations and a rigorous approach based on the dynamic theory of elasticity using \"Debye type\" potentials. In previous studies of anisotropic structures, anisotropic media or anisotropic half-spaces were used. Materials and methods. Both an approximate thin shell method and a rigorous approach based on the dynamic theory of elasticity and \"Debye type\" potentials are used in the paper. Main results. Equations for finding the phase velocities of elastic waves in anisotropic cylindrical bodies are obtained. Phase velocities of longitudinal and bending waves in anisotropic cylindrical rod are calculated. Conclusion. As a result of the conducted research relations for calculating the phase velocities of elastic waves in an orthotropic shell and a transversely isotropic rod were found.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44094412","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 : 2022-07-05DOI: 10.24937/2542-2324-2022-3-401-103-115
А.А. Martynov, V. Samsygin, D. Sokolov
Object and purpose of research. The object of work is the energy supply systems of resident underwater robots and robotic complexes. The goal is to develop and research new methods and devices for energy supply of resident underwater robots and robotic complexes, as well as to find ways to improve them. Materials and methods. The study was conducted on the basis of analytical methods and calculation and study of energy supply systems for resident underwater robots and robotic complexes. Main results. New systems and devices for power supply of resident underwater robots and robotic complexes have been developed, converting the energy of the World Ocean into electrical energy for charging batteries. All developed systems and devices are protected by patents of the Russian Federation. Conclusion. The results of the development and research expand the possibilities of choosing the optimal option for the energy supply system for resident underwater robots and robotic complexes and contribute to accelerating the process of their implementation in practice.
{"title":"On the issue of energy supply of resident underwater robots and robotic complexes","authors":"А.А. Martynov, V. Samsygin, D. Sokolov","doi":"10.24937/2542-2324-2022-3-401-103-115","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-3-401-103-115","url":null,"abstract":"Object and purpose of research. The object of work is the energy supply systems of resident underwater robots and robotic complexes. The goal is to develop and research new methods and devices for energy supply of resident underwater robots and robotic complexes, as well as to find ways to improve them. Materials and methods. The study was conducted on the basis of analytical methods and calculation and study of energy supply systems for resident underwater robots and robotic complexes. Main results. New systems and devices for power supply of resident underwater robots and robotic complexes have been developed, converting the energy of the World Ocean into electrical energy for charging batteries. All developed systems and devices are protected by patents of the Russian Federation. Conclusion. The results of the development and research expand the possibilities of choosing the optimal option for the energy supply system for resident underwater robots and robotic complexes and contribute to accelerating the process of their implementation in practice.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44386405","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}
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