Pub Date : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-116-122
A. O. Volchek, V. Mikhailenko, D. S. Malovik, E. Kicha
Object and purpose of research. Methods of biological aerosol research and technical means for their implementation. Subject matter and methods. Analysis of technical documentation for used and prospective equipment. Main results. The main parameters of foreign and domestic bioaerosol analysis devices based on the flow-optical method. Conclusion. Based on the results obtained, it can be concluded that the development of methods for the analysis of bioaerosol particles in the near future will be determined by the development of new radiation sources for the effective excitation of particle fluorescence, as well as the creation of new techniques to determine the independent quantitative and qualitative parameters of the studied particles. A typical example is the creation of a highly efficient system that combines several approaches, including destructive laser spectroscopy, which was not previously used in the flow-optical method.
{"title":"Review of automatic control tools for biological agent in the atmosphere above sea surface","authors":"A. O. Volchek, V. Mikhailenko, D. S. Malovik, E. Kicha","doi":"10.24937/2542-2324-2023-1-403-116-122","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-116-122","url":null,"abstract":"Object and purpose of research. Methods of biological aerosol research and technical means for their implementation. Subject matter and methods. Analysis of technical documentation for used and prospective equipment. Main results. The main parameters of foreign and domestic bioaerosol analysis devices based on the flow-optical method. Conclusion. Based on the results obtained, it can be concluded that the development of methods for the analysis of bioaerosol particles in the near future will be determined by the development of new radiation sources for the effective excitation of particle fluorescence, as well as the creation of new techniques to determine the independent quantitative and qualitative parameters of the studied particles. A typical example is the creation of a highly efficient system that combines several approaches, including destructive laser spectroscopy, which was not previously used in the flow-optical method.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44837330","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-159-166
V. Kirpichnikov, A. Grishin, V. Savenko, V. Smolnikov
Object and purpose of research. This paper discusses thick stiffened plates for ship structures. The purpose is to determine the efficiency of vibration dampers (resonant anti-vibration straps with two reinforced vibration damping coatings installed on them). Subject matter and methods. Measurements of plate vibration spectra with and without vibration dampers stuck to the structure by means of a PVA-based self-adhesive tape. Main results. The study has established that efficient vibration damping of thick-plated structures is possible in principle. Conclusion. The study showed that vibration levels of thick-plated structure in a wide frequency band could be reduced by means of the dampers with the total weight considerably lower than the weight of the target structure itself.
{"title":"Vibration damping of thick-plated ship structure: experimental studies","authors":"V. Kirpichnikov, A. Grishin, V. Savenko, V. Smolnikov","doi":"10.24937/2542-2324-2023-1-403-159-166","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-159-166","url":null,"abstract":"Object and purpose of research. This paper discusses thick stiffened plates for ship structures. The purpose is to determine the efficiency of vibration dampers (resonant anti-vibration straps with two reinforced vibration damping coatings installed on them). Subject matter and methods. Measurements of plate vibration spectra with and without vibration dampers stuck to the structure by means of a PVA-based self-adhesive tape. Main results. The study has established that efficient vibration damping of thick-plated structures is possible in principle. Conclusion. The study showed that vibration levels of thick-plated structure in a wide frequency band could be reduced by means of the dampers with the total weight considerably lower than the weight of the target structure itself.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46509647","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-48-59
V. Zemlyak, V. Kozin, A. Vasilyev, S.A. Chingalaev
Object and purpose of research. This paper discusses motion parameters of submerged body with given shape near the free surface at limited water depth. The purpose of this study was to determine the effect of water depth upon wave-making resistance, uplift force and hydrodynamic moment acting on the body from the side of fluid. Subject matter and methods. The paper relies on simulation procedure, as well as model test techniques and results obtained at the test tank. Numerical simulation was performed in ANSYS software package. Main results. This experimental and theoretical study yielded the parameters of water depth effect upon wave-making resistance, uplift force and hydrodynamic moment taking place when a submerged body runs near free surface. Conclusion. The results of this study could be helpful for horizontal stabilization of submerged body moving at various speeds and various diving depths in shallow water areas.
{"title":"Water depth effect upon motion parameters of submerged body near free surface","authors":"V. Zemlyak, V. Kozin, A. Vasilyev, S.A. Chingalaev","doi":"10.24937/2542-2324-2023-1-403-48-59","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-48-59","url":null,"abstract":"Object and purpose of research. This paper discusses motion parameters of submerged body with given shape near the free surface at limited water depth. The purpose of this study was to determine the effect of water depth upon wave-making resistance, uplift force and hydrodynamic moment acting on the body from the side of fluid. Subject matter and methods. The paper relies on simulation procedure, as well as model test techniques and results obtained at the test tank. Numerical simulation was performed in ANSYS software package. Main results. This experimental and theoretical study yielded the parameters of water depth effect upon wave-making resistance, uplift force and hydrodynamic moment taking place when a submerged body runs near free surface. Conclusion. The results of this study could be helpful for horizontal stabilization of submerged body moving at various speeds and various diving depths in shallow water areas.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47362365","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-107-115
M. Kicha, V. Mikhailenko, D. S. Malovik
Object and purpose of research. The archival results of the study of the dependence of the concentration of saturated turbine oil vapors in the air of the ship's room on temperature in the range from 15 °С to 110 °С are presented. Subject matter and methods. The method of measuring the mass loss of an equilibrium cell containing the test sample in an air stream with a known temperature and flow rate providing saturation of the air with turbine oil vapors is used. Main results. Experimental data are theoretically justified by a dependency that provides reliable interpolation and extrapolation. Conclusion. The data obtained can be used in calculating the concentration of turbine oil in shipboard and other rooms, as well as for planning similar studies of other turbine oils and other liquids with a low saturated vapor pressure. The data can also be useful in the development of test equipment to test the effectiveness of air filters.
{"title":"Concentration of saturated turbine oil vapors in ship spaces as function of temperature","authors":"M. Kicha, V. Mikhailenko, D. S. Malovik","doi":"10.24937/2542-2324-2023-1-403-107-115","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-107-115","url":null,"abstract":"Object and purpose of research. The archival results of the study of the dependence of the concentration of saturated turbine oil vapors in the air of the ship's room on temperature in the range from 15 °С to 110 °С are presented. Subject matter and methods. The method of measuring the mass loss of an equilibrium cell containing the test sample in an air stream with a known temperature and flow rate providing saturation of the air with turbine oil vapors is used. Main results. Experimental data are theoretically justified by a dependency that provides reliable interpolation and extrapolation. Conclusion. The data obtained can be used in calculating the concentration of turbine oil in shipboard and other rooms, as well as for planning similar studies of other turbine oils and other liquids with a low saturated vapor pressure. The data can also be useful in the development of test equipment to test the effectiveness of air filters.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45274351","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-31-47
A. Dulnev
Object and purpose of research. This paper discusses underwater explosion. The purpose of the study was to justify the mathematical model enabling the assessment of gas bubble pulses of underwater explosion for a wide range of explosion depths and charge weights. Subject matter and methods. The paper discusses an explosion in open-water conditions. The study relies on analytical materials, numerical solution of common differential equations and on the experimental data. Main results. The study describes calculation expressions for gas bubble pulse parameters available in literature. It also compares calculation results with the experimental data for TNT explosions. Conclusion. As compared to existing solutions and empirical expressions, the mathematical model suggested in this paper enables the assessment of pulse parameters for a wide range of explosion depths and charge weights. Calculation results obtained as per this model correlate with available test data. The results of this work may be used to estimate underwater explosion impact upon marine objects and structures.
{"title":"Underwater explosion in open water: gas bubble parameters","authors":"A. Dulnev","doi":"10.24937/2542-2324-2023-1-403-31-47","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-31-47","url":null,"abstract":"Object and purpose of research. This paper discusses underwater explosion. The purpose of the study was to justify the mathematical model enabling the assessment of gas bubble pulses of underwater explosion for a wide range of explosion depths and charge weights. Subject matter and methods. The paper discusses an explosion in open-water conditions. The study relies on analytical materials, numerical solution of common differential equations and on the experimental data. Main results. The study describes calculation expressions for gas bubble pulse parameters available in literature. It also compares calculation results with the experimental data for TNT explosions. Conclusion. As compared to existing solutions and empirical expressions, the mathematical model suggested in this paper enables the assessment of pulse parameters for a wide range of explosion depths and charge weights. Calculation results obtained as per this model correlate with available test data. The results of this work may be used to estimate underwater explosion impact upon marine objects and structures.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41817830","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-87-98
M. Lobachev, A. Taranov, T. Saifullin, A. N. Malashin, Yu.A. Egorov
Object and purpose of research. This paper is intended to develop a mathematical model of cavitation void fragmentation into separate collapsing bubbles as an acoustic source for further implementation in Logos software package. The study was performed on propeller models in cavitating environment. Subject matter and methods. Volume and quantity of bubbles appearing after fragmentation of a cavitation void on propellers, as well as amplitude and frequency properties of a single bubble collapse are studied as per CFD methods. Viscous flow properties are found from finite-volume (FVM) solution to unsteady Reynolds equations (RANS) closed by a biparametric semi-empirical turbulence model. The coefficients in the mathematical model of acoustic source thus obtained were calibrated through validation that included noise measurements at KSRC Cavitation Tunnel. Main results. This work included numerical simulation of collapse dynamics for a single cavitation bubble at different initial conditions, with approximation of the pressure impact created by bubble collapse in the infinite fluid and near a solid wall. The study estimated volume and quantity of the bubbles created by the fragmentation of cavitation void on propellers (3 propellers of different shape operating at different advance ratios and cavitation numbers). The mathematical model representing above-mentioned process could be further implemented in Logos software as a finite-volume algorithm with k-ω SST turbulence model. The study also created a validation base for further testing and calibration of the mathematical model thus developed. Conclusion. The study was performed as part of project Mathematical simulation on exa- and zetaflops class supercomputers launched by National Centre for Physics and Mathematics (Russia). The analysis of obtained results has shown that the mathematical model suggested in this paper does have practical potential, but it needs additional empirical data for greater flexibility and more accurate estimates. Without this model, these practical tasks still could be handled but at a cost of considerable and, most importantly, unnecessary increase in required hardware resources.
{"title":"Cavitation void fragmentation as acoustic source: mathematical model","authors":"M. Lobachev, A. Taranov, T. Saifullin, A. N. Malashin, Yu.A. Egorov","doi":"10.24937/2542-2324-2023-1-403-87-98","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-87-98","url":null,"abstract":"Object and purpose of research. This paper is intended to develop a mathematical model of cavitation void fragmentation into separate collapsing bubbles as an acoustic source for further implementation in Logos software package. The study was performed on propeller models in cavitating environment. Subject matter and methods. Volume and quantity of bubbles appearing after fragmentation of a cavitation void on propellers, as well as amplitude and frequency properties of a single bubble collapse are studied as per CFD methods. Viscous flow properties are found from finite-volume (FVM) solution to unsteady Reynolds equations (RANS) closed by a biparametric semi-empirical turbulence model. The coefficients in the mathematical model of acoustic source thus obtained were calibrated through validation that included noise measurements at KSRC Cavitation Tunnel. Main results. This work included numerical simulation of collapse dynamics for a single cavitation bubble at different initial conditions, with approximation of the pressure impact created by bubble collapse in the infinite fluid and near a solid wall. The study estimated volume and quantity of the bubbles created by the fragmentation of cavitation void on propellers (3 propellers of different shape operating at different advance ratios and cavitation numbers). The mathematical model representing above-mentioned process could be further implemented in Logos software as a finite-volume algorithm with k-ω SST turbulence model. The study also created a validation base for further testing and calibration of the mathematical model thus developed. Conclusion. The study was performed as part of project Mathematical simulation on exa- and zetaflops class supercomputers launched by National Centre for Physics and Mathematics (Russia). The analysis of obtained results has shown that the mathematical model suggested in this paper does have practical potential, but it needs additional empirical data for greater flexibility and more accurate estimates. Without this model, these practical tasks still could be handled but at a cost of considerable and, most importantly, unnecessary increase in required hardware resources.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":"57 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41244148","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-60-66
S. Vilkov
Object and purpose of research. This paper discusses existing approaches to ship stability assessment in terms of steady-turning heel so as to justify the calculation procedure for its initial metacentric height. Subject matter and methods. The study relies on available literature discussing steady-turning heel calculation. It analyses current calculation expressions estimating initial transverse stability in terms of steady-turning heel angle. It has been established that so far this estimate has not been substantiated by any reliable procedure, and the literature on this topic contains a number of inaccuracies and even errors. Main results. The study presents analytical calculation expressions for initial transverse metacentric height of ship in terms of its steady-turning heel. It confirms that calculations have to be performed with a more accurate value for Z-coordinate of hydrodynamic force application point. Conclusion. The procedure developed under this study enables fast monitoring of ship stability and Z-coordinate of its CG in terms of steady-turning heel angle.
{"title":"Ship stability control in terms of steady-turning heel angle","authors":"S. Vilkov","doi":"10.24937/2542-2324-2023-1-403-60-66","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-60-66","url":null,"abstract":"Object and purpose of research. This paper discusses existing approaches to ship stability assessment in terms of steady-turning heel so as to justify the calculation procedure for its initial metacentric height. Subject matter and methods. The study relies on available literature discussing steady-turning heel calculation. It analyses current calculation expressions estimating initial transverse stability in terms of steady-turning heel angle. It has been established that so far this estimate has not been substantiated by any reliable procedure, and the literature on this topic contains a number of inaccuracies and even errors. Main results. The study presents analytical calculation expressions for initial transverse metacentric height of ship in terms of its steady-turning heel. It confirms that calculations have to be performed with a more accurate value for Z-coordinate of hydrodynamic force application point. Conclusion. The procedure developed under this study enables fast monitoring of ship stability and Z-coordinate of its CG in terms of steady-turning heel angle.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47056271","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-99-106
M. Sokolov
Object and purpose of research. This paper discusses towing test data extrapolation for submarines (in submerged conditions) as per two different procedures to compare the results. Subject matter and methods. The study relied on model test data for submarines and submersibles available with Krylov State Research Centre Deepwater Test Tank and performed as per Procedure [1], and on towing test data extrapolation results obtained as per References [2, 4]. Test results are extrapolated to the full-scale as per two procedures, with subsequent comparison of towing resistance values for model hull. Main results. The paper demonstrates that the deviation between the two procedures is insignificant and commensurable with acceptable measurement error, with discussion on possible reasons for this deviation. Conclusion. Despite minor deviations in towing test procedures described in [1, 4], full-scale extrapolations obtained as per References [2, 4] coincide, which indirectly confirms reliability of the results and correctness of the assumptions.
{"title":"Comparison of extrapolation procedures for submarine towing test data","authors":"M. Sokolov","doi":"10.24937/2542-2324-2023-1-403-99-106","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-99-106","url":null,"abstract":"Object and purpose of research. This paper discusses towing test data extrapolation for submarines (in submerged conditions) as per two different procedures to compare the results. Subject matter and methods. The study relied on model test data for submarines and submersibles available with Krylov State Research Centre Deepwater Test Tank and performed as per Procedure [1], and on towing test data extrapolation results obtained as per References [2, 4]. Test results are extrapolated to the full-scale as per two procedures, with subsequent comparison of towing resistance values for model hull. Main results. The paper demonstrates that the deviation between the two procedures is insignificant and commensurable with acceptable measurement error, with discussion on possible reasons for this deviation. Conclusion. Despite minor deviations in towing test procedures described in [1, 4], full-scale extrapolations obtained as per References [2, 4] coincide, which indirectly confirms reliability of the results and correctness of the assumptions.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68974819","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-78-86
G. Kryzhevich, A. R. Filatov
Object and purpose of research. This paper discusses hydraulic-release couplings of pillars and substructures for fixed marine platforms. This topic is relevant because at some platforms hydraulic-release couplings contribute to crack initiation. The purpose of this study was to work out design solutions that would mitigate residual strains so as to preclude pillar cracking due to hydraulic release, thus making the pillars more durable. Achieving this purpose will make hydraulic release more suitable for routine operation, and will also make Russian manufacturers of fixed marine platforms more independent from Western patent holders of hydraulic release system designs. Subject matter and methods. Design solutions suggested in this study were tried out through finite-element simulation of hydraulic release process. Plastic straining of pillars was taken into account by means of a linear kinematic model of hardening. Main results. The study covered seven possible designs of hydraulic release units and yielded load diagrams for both plastic straining of pillar over the entire working cycle of hydraulic release (with indication of maximum accumulated plastic strain) and subsequent pillar pull-out from substructure. Conclusion. The study yielded an optimal design solution for hydraulic release joint that both reduces plastic straining of pillar and increases axial stiffness of the joint itself.
{"title":"Design optimization and reliability enhancement for hydraulic-release couplings of pillars and substructures for fixed marine platforms","authors":"G. Kryzhevich, A. R. Filatov","doi":"10.24937/2542-2324-2023-1-403-78-86","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-78-86","url":null,"abstract":"Object and purpose of research. This paper discusses hydraulic-release couplings of pillars and substructures for fixed marine platforms. This topic is relevant because at some platforms hydraulic-release couplings contribute to crack initiation. The purpose of this study was to work out design solutions that would mitigate residual strains so as to preclude pillar cracking due to hydraulic release, thus making the pillars more durable. Achieving this purpose will make hydraulic release more suitable for routine operation, and will also make Russian manufacturers of fixed marine platforms more independent from Western patent holders of hydraulic release system designs. Subject matter and methods. Design solutions suggested in this study were tried out through finite-element simulation of hydraulic release process. Plastic straining of pillars was taken into account by means of a linear kinematic model of hardening. Main results. The study covered seven possible designs of hydraulic release units and yielded load diagrams for both plastic straining of pillar over the entire working cycle of hydraulic release (with indication of maximum accumulated plastic strain) and subsequent pillar pull-out from substructure. Conclusion. The study yielded an optimal design solution for hydraulic release joint that both reduces plastic straining of pillar and increases axial stiffness of the joint itself.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47919219","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 : 2023-02-15DOI: 10.24937/2542-2324-2023-1-403-134-141
Yu.N. Myasnikov, O. Savchenko, A.A. Tsybulyak
Object and purpose of research. This paper discusses combined marine power plants to develop an operational harmonization procedure for different main engines in steady running conditions at partial load. Subject matter and methods. Graphical and computational analysis of propulsion system elements working jointly. Main results. Development of procedure for construction of torque-vs-RPM curves of combined power plant, with demonstration of its practical application for a ship with CODAG power plant. Conclusion. Main engine operation in terms of torque-vs-RPM curve is the best indicator for technical condition of propulsion system elements for a sea-going ship. If torque-vs-RPM curve for “newly built” condition is available, reliability of the engine could be kept at almost the maximum level by means of preventive maintenance.
{"title":"Graphical analytic method of obtaining torquevs- RPM curves for a combined marine power plant","authors":"Yu.N. Myasnikov, O. Savchenko, A.A. Tsybulyak","doi":"10.24937/2542-2324-2023-1-403-134-141","DOIUrl":"https://doi.org/10.24937/2542-2324-2023-1-403-134-141","url":null,"abstract":"Object and purpose of research. This paper discusses combined marine power plants to develop an operational harmonization procedure for different main engines in steady running conditions at partial load. Subject matter and methods. Graphical and computational analysis of propulsion system elements working jointly. Main results. Development of procedure for construction of torque-vs-RPM curves of combined power plant, with demonstration of its practical application for a ship with CODAG power plant. Conclusion. Main engine operation in terms of torque-vs-RPM curve is the best indicator for technical condition of propulsion system elements for a sea-going ship. If torque-vs-RPM curve for “newly built” condition is available, reliability of the engine could be kept at almost the maximum level by means of preventive maintenance.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45131855","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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