Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra最新文献

{"title":"Automation of the construction of finite element models for calculating the strength of ship hull structures","authors":"A. Aleksandrov, T. Rybalko","doi":"10.24937/2542-2324-2022-1-399-89-94","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-89-94","url":null,"abstract":"purpose of the work is to automate the work in the construction of a finite element model (FEM) and to calculate the strength of a vessel and marine equipment objects using the universal programming language TCL and the graphic library Tk. Materials and methods. The study is based on the use of the finite element method (FEM) and the TCL programming language. Main results. A specialized data management tool has been created at the stage of constructing a computational model, which is universal and focused on reducing time several times compared to traditional technologies in the development of spatial complex finite element vessels and marine equipment objects. Conclusion. The results of the technology of automation of the construction of a ship model and marine equipment objects can be effectively used in research institutes and design bureaus in strength calculations.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46354355","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":"Effective mechanical characteristics of symmetric layered composite in different loading conditions","authors":"A. Lysenko, L. Parshina, B. Yartsev","doi":"10.24937/2542-2324-2022-1-399-75-88","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-75-88","url":null,"abstract":"Object and purpose of research. This paper discusses balanced and quasi-isotropic (in the reinforcement plane) symmetric layered composite structures made up by the layers of clotheinforced GRP. The purpose of this work was to demonstrate the necessity to justify the applicability of experimental results for effective mechanical parameters determined in the conditions of uniaxial tension/compression to the calculation of thin-walled layered composite structures that work in bending/twisting conditions. Materials and methods. The straining of layered composite structures is simulated as per the updated theory of first-order plates, the model of complex moduli and the principle of elastic-viscoelastic correspondence in linear viscoelasticity theory. Limit state predictions are based on Tsai-Wu tensor-polynomial strength criterion. Main results. This paper suggests the expressions that predict effective elastic constants, dissipation properties and strength limits for symmetric layered structures under investigation. The study shows that balanced symmetric structure made up by four layers of composite may be regarded, with the accuracy sufficient for engineering calculations, as an ortho-tropic material for all loading conditions. At the same time, symmetric quasi-isotropic (in the reinforcement plane) structure made up by thirty two composite layers must be regarded as orthotropic in case of tension/compression and monoclinic in case of bending/twisting. Conclusion. The study has shown the necessity to justify the application of experimental effective mechanical properties for uniaxial tension/compression to calculation of thin-walled layered composite structures exposed to bending/twisting.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46363263","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":"Multi-role support vessel: design specifics","authors":"Yu. Mogutin, M. Vlasyev, E. Fomichev, P. Kryukov","doi":"10.24937/2542-2324-2022-1-399-111-124","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-111-124","url":null,"abstract":"Object and purpose of research. This paper discusses a multi-role support vessel working as a supply ship, a tug and an anchor handler. The purpose of the study was to obtain an optimal design that could be of interest for potential customers, like oil and gas companies and offshore fleet operators. Materials and methods. The paper describes design peculiarities of multi-role support vessels, methodological approach to justification of main design solutions and principal results of these justifications in terms of selecting main dimensions, lines and structures for hull, architecture and arrangement of main equipment, propulsion system components, etc. It also describes model tests undertaken as part of this project in order to obtain high propulsion, seakeeping, maneuverability and ice performance parameters. The study outlines technical solutions adopted to widen the ship’s functionality, i.e. modular payloads and detachable equipment. Main results. As part of Russian State Program Development of offshore shipbuilding and technology for the years 2013-2030, Krylov State Research Centre completed a design of multi-role support vessel. This work was performed in two stages. The first stage was intended to develop the technical proposal (further transformed into the Technical Assignment for Detailed Design) and to justify principal design solutions with participation of possible customers. The second stage was dedicated to model tests, update of design solutions and detailed design development of multi-purpose support vessel in the scope sufficient to obtain the approval from Russian Maritime Register of Shipping. Conclusion. This multi-role support vessel is intended as a baseline variant for further modifications to the needs of the customers (oil and gas companies and offshore operators) which will enable its large-batch construction and eventually reduce lead ship construction costs, as well as make this ship a good replacement for the fleet of foreign service companies currently contracted for support of oil and gas facilities in Russian offshore areas.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46094995","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":"Mutual induction and self-induction coefficients of single- and doublelayer coils","authors":"G. Tsitsikyan, M. Antipov, S. Kunaev","doi":"10.24937/2542-2324-2022-1-399-130-136","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-130-136","url":null,"abstract":"Object and purpose of research. This paper discusses single- and double-layer coils. The purpose of the study was to improve the operation of ship power systems. Materials and methods. The study relied on the methods of mathematical physics and theoretical electric engineering. Main results. The study analyses current methods and recommendations for inductance calculations of single- and double-layer coils. Based on the comparative analysis, the paper suggests the expressions that make it possible to do without the tabular values. Conclusion. The study yielded strict expressions with special functions that entail from the overlapping of a number of idealized representations. As an example for one of them, the paper gives a formula expressing the inductance in terms of spherical Legendre functions with semi-integer index. The comparison of recommended calculation expressions for doublelayer coil inductance has not found any significant deviations.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41735633","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":"Effect of manufacturing technology for noise and vibration damping tools upon their physical, mechanical and acoustic parameters","authors":"P. Kuzmenko, A. Krylov","doi":"10.24937/2542-2324-2022-1-399-141-149","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-141-149","url":null,"abstract":"Object and purpose of research. This paper discusses typical acoustic protection tools, like resilient mounts and sonar coatings. The purpose is to determine how manufacturing technology of acoustic protection tools affects their performance. Materials and methods. The study is based on the experiments intended to obtain physical, mechanical, operational and elastic-hysteresis properties of polyurethane material, as well as physical, mechanical and acoustic properties of acoustic protection tools manufactured as per various technologies. Main results. This research established the manufacturing technology effect of polyurethane compound upon the properties of elastomeric materials and acoustic protection tools made of it. Analysis of the results served to estimate pros and cons for each of the technologies under investigation in terms of their relevance with respect to advanced acoustic protection designs, as well as to estimate practicability of further studies in this direction. Conclusion. Dynamic shear modulus reduction of the material used in production of sonar coatigns and resilient mounts could be achieved through a technology where the components of polyurethane compound, prior to their use, are mixed (homogenized) separately without vacuum, which attracts additional air into them.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44377509","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":"Tail shape determination for foil profile","authors":"V. Bagrintsev, N. Marinich","doi":"10.24937/2542-2324-2022-1-399-43-48","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-43-48","url":null,"abstract":"Object and purpose of research. This paper discusses mitigation of vortex shedding from the trailing edge of foil profile and, accordingly, of alternating-sign unsteady forces through modification of foil geometry. Materials and methods. Theoretical calculations for perfect fluid, numerical simulation in viscous incompressible fluid, cavitation tunnel tests of conventional thruster-type foils and the foils with modified profile. Main results. The study yielded hydrodynamic parameters (lift and resistance coefficients) for the profiles under investigation. The tests also yielded cavitation data. As a result, it was possible to compare lift and resistance coefficients of conventional and modified profiles as per theoretical estimates and test data. Conclusion. Analysis of the changes in hydrodynamic parameters has shown that the method suggested by the authors is quite efficient and it is practicable to perform further tests with propeller.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68974957","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":"Calculation of dipole magnetic moment from open-surface measurements","authors":"A. Vishnevsky, A. Firsova","doi":"10.24937/2542-2324-2022-1-399-168-175","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-168-175","url":null,"abstract":"Object and purpose of research. This paper discusses a quadrature-based method of dipole magnetic moment (DMM) calculation as per magnetic field measurement data for the open surface encompassing magnetic field sources. The purpose of the study was to modify this method for the case when measurement data are not available for certain areas on the surface (in other words, when the surface is not closed). Materials and methods. The paper describes magnetic dipole calculation methods, as well as the publications discuss-ing their efficiency. The method suggested in this paper basically substitutes the lacking magnetic field data by the values for pre-defined type of source, thus giving the correction coefficients needed to take into account the contribution of lacking areas. Main results. The paper suggests the methods for taking into account the missing parts of the open measurement surface in quadrature-based DMM calculation procedure. Calculation errors of DMM components for magnetic fields of various structure are estimated as per the solution for a series of test problems. Conclusion. The quadrature method offered in this study offers more accurate DMM calculation. The expressions given in the paper could be used to calculate DMM components as per magnetic field measurements for the generatrices of cylindrical surface, and the approach suggested in this study could be applied to arbitrary open surfaces.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46815626","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":"Sea currents monitoring in the coastal areas by the remote observation methods","authors":"V. Gorbatsky, N. Shpilev, Ye. Lebedeva","doi":"10.24937/2542-2324-2022-1-399-159-167","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-159-167","url":null,"abstract":"Object and purpose of research. The compare analysis carried out on the vorticies structure optical satellite pictures observation of the sea surface and the velocities field obtained by the ground HF Doppler radar. The purpose of this research is estimation of the possibility on fast monitoring feasibility assessment for the changes in littoral waters dynamics through joint application of satellite surveillance, radar probing of sea currents, wind data and numerical simulation of water circulation in the area under investigation. Materials and methods. The Sea surface observation data obtained by the satellites Sentinel 1 and 2 and by the coastal Doppler HF radar Sea Sonde in the South-east Black Sea area are analyzing. The additional data on the satellite observation of this area and on the wind condition is used from LANCE processing system [9, 10] and reanalysis NCEP/NCAR [11, 12]. The comparative analysis is carried out on the large vertical structures (LVS) establishing in the research coastal area. The numerical modeling of the water mass circulation in this area is carried out by the software package COHERENS (Belgian Institute of Natural Science) to investigate the role of the wind conditions at LVS appearance in the research area. Main results. The LVS in the vicinity of Sea coast line could be generated, as satellites observations demonstrated, by the vortices arrived along the coast line from the east-south direction in accordance with the Black Sea general circulation flow. Such vortices could be induced by the bottom roughness, rivers discharges and another local sources. Another LVS source could be connected with the wind impact in some affordable direction as demonstrated by the numerical modeling of the coastal water circulation. The continuous currents measurements at the Sea surface by Doppler HF coastal Radar supply the valuable data for further details on the space –time variation of LVS parameters and operational forecast of the hydrology regime in the aquatic areas. The operative numerical modelling of the wind impact to the surface currents structures formation provides the efficient estimation of the local large vorticity structure appearance in the research area. Conclusion. Satellite radar and optical observation provide the large scale control on the Sea surface dynamics conditions, but that is limited by relatively long interval between satellite tracks over the region of interest and do not acquire optical data at the cloud cover. The additional data could be operative obtain from the open internet resource in satellite optical, radar and meteorological data (LANCE, NCEP/NCAR), to get the more details development of the Sea surface dynamics. Sub-satellite Sea currents measurements by HF Doppler radar are useful for the reliable interpretation of satellite pictures and for the proper forecast of the aquatic area dynamics. Operative numerical modelling of the Sea coastal water circulation in accordance with variable me","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46854603","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":"Propeller design with pre-swirl stators","authors":"A. Koval, A. Maslova, N. Marinich","doi":"10.24937/2542-2324-2022-1-399-95-101","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-95-101","url":null,"abstract":"Object and purpose of research. This research was intended to check if a pre-swirl stator installed before an open propeller of moderate skew could be a viable solution for non-cavitation hydrodynamic noise mitigation. This solution was compared with a typical open skewed silent propeller. Materials and methods. Design and verification calculations have been performed in a given wake field of pre-swirl stator. Pre-swirl stator was designed considering the wake field turn at the skew angles of typical propeller. Wake field behind the pre-swirl stator and design calculation of open propeller considering the heterogeneity of inflow were determined using the calculation methods. The tests and calculations of vibroacoustic parameters have been performed for evaluation of propulsion, cavitation and acoustic parameters of propellers with pre-swirl stators in comparison with open propeller. Main results. This work was also intended to answer the question if a moderate-skew propeller with pre-swirl stator could be an alternative to a silent skewed open propeller. To this effect, a model of propulsion system (propeller + pre-swirl stator) was designed and manufactured. This model was further used for comparative cavitation, hydrodynamic and acoustic testing in the cavitation tunnel, as well as for self-propulsion tests in deep-water towing tank. Conclusion. The tests have shown that propellers with pre-swirl stators have lower noise emission at high frequencies than open propellers. Cavitation and propulsion performance remain the same for both options.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48470739","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":"Мгновенное рассеивание мощности в усилителях класса АВ и класса В","authors":"E. Sirakov, G. Evstatiev","doi":"10.24937/2542-2324-2022-1-399-137-140","DOIUrl":"https://doi.org/10.24937/2542-2324-2022-1-399-137-140","url":null,"abstract":"This paper presents analysis of class AB and class B amplifiers dissipation calculated by equals (1) and (2) with MathCad. The figure shows works of push-pull audio power amplifier computer simulations with PSpice Student Version.","PeriodicalId":33210,"journal":{"name":"Trudy Krylovskogo gosudarstvennogo nauchnogo tsentra","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49182950","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}