Rationalization of the organization of new industries and technological processes at the ship-repair enterprises of the Navy during the Great Patriotic War

В годы Великой Отечественной войны руководством НКВМФ уделялось большое внимание рационализаторской работе на флоте. Что принесло ощутимые результаты в поддержании боевой готовности кораблей и частей ВМФ, в совершенствовании техники и средств вооружения, но прежде всего стало серьезным стимулом в развитии творческой инициативы командиров и краснофлотцев. Не остались без внимания и такие флотские структуры как судоремонтные предприятия (заводы и мастерские флотов и флотилий). В 1943–1944 годы Техническое управление НКВМФ, с целью обобщения опыта рационализаторской работы судоремонта обратилось к руководителям этих предприятий с требованием представить для анализа и обобщения наиболее важные и значимые рационализаторские предложения, направленные на развитие производства и совершенствование технологических процессов. В 1944 году, на основе обобщенного опыта рационализаторской работы на судоремонтных предприятиях ВМФ Техническим управлением НКВМФ был издан сборник «Опыт судоремонта и освоение новых видов производства на судоремонтных предприятиях ВМФ в Отечественную войну». В данном документе, с целью распространения и использования, были представлены наиболее интересные и перспективные изобретения и рационализаторские предложения, разработанные и реализованные на судоремонтных предприятиях по 1944 год. During the Great Patriotic War, the leadership of the NKVMF paid great attention to rationalization work in the fleet. This brought tangible results in maintaining the combat readiness of ships and units of the Navy, in improving equipment and weapons, but above all it became a serious incentive in the development of the creative initiative of commanders and Red Navy men. Such naval structures as ship repair enterprises (factories and workshops of fleets and flotillas) did not go unnoticed either. In 1943-1944, the NKVMF Technical Directorate, in order to summarize the experience of the rationalization work of ship repair, turned to the heads of these enterprises with the requirement to submit for analysis and generalization the most important and significant rationalization proposals aimed at the development of production and the improvement of technological processes. In 1944, on the basis of the generalized experience of rationalization work at the naval shipyards, the NKVMF Technical Directorate published the collection "Experience of ship repair and the development of new types of production at naval shipyards in the Patriotic War." In this document, in order to disseminate and use it, the most interesting and promising inventions and rationalization proposals developed and implemented at shipyards until 1944 were presented.

Package of measures for prevention of introducing and spread of a novel coronavirus disease on ships and vessels of the Navy

Purpose. Against the background of new coronavirus disease COVID-19 and increasing cases of infection of the personnel of naval ships and vessels of NATO countries, leadership of great maritime powers has to initiate the correction of naval policy and its adaptation to contemporary conditions, seeks an increasing sustainability of naval structures to future epidemic risks and intends to minimize the effects of quarantine restrictions.Materials and methods. Aspects of work of commanding officers and captains of vessels (officials) aimed at prevention of introducing and spread of actual infection at two stages of epidemic prevention measures were examined: 1) in the pre-voyage preparation period; 2) when performing sea duties, in the case of appearance of a crew member suspicious for infection with a novel coronavirus disease COVID-19 on board ship.Results and discussion. The experience of the Russian Navy in the implementation of organizational, educational, epidemic prevention and control measures was presented. It allowed to confine the actual disease on ships.

The Numerical and Experimental Analysis to Study the Effect of Double Triangle Core on the Dynamic Response of Sandwich Structure

Sandwich structure plates are most widely used in the automotive, aerospace and naval structures. As it gives material with low density and relatively high normal compression and shear properties. In this paper, Finite element method was used with ANSYS APDL (16) to analyze the effect of duplicate core in sandwich steel structure on the dynamic response under the action of impact loading. Also, conducted impact tests with hammer and NI devises to achieve the simulation results. The chief purpose of this work is to get a high reduction in deformation between upper and lower skins. Isolate deflections of sandwich plates are compared between single and double cores of structures. The construction of the sandwich composite model consisted of two sheets layers with single triangle corrugated core and three sheets layer with double triangle corrugated core. All of configurations for both core and skin are made from the same material (steel alloy 304) and have (500mm × 500mm) length and width . The properties of materials are isotropic and have an elastic modulus (198 Gpa), density (7835 kg/m3) and Poisson ratio is (0.3). The results observed that the reduction of deflection and strain are increased in double core. The comparison between experimental and numerical transient results gives good agreement with error does not exceed (13%).

Numerical simulation of the formation of vortices around rigid cylinders inside a channel using Immersed Interface method

The numerical simulation of the flow of fluid through one or a set of objects that causes the flow to separate from the surface of them has been the subject of interest by researchers over the past few decades. One of the most important types of these objects is those with a square cross section which have important and diverse applications in different industries. One of the practical applications of these types of streams is flow around chimneys, high-rise buildings, naval structures, suspended bridges, airplane wings, ship propellers and ducts. In this research, the immersed interface method is used which is a non-conforming method to the boundary. Eulerian mesh for fluid field, and Lagrangian mesh for solid field is used. The connection of these two networks is established by the Dirac Delta function. Considering the cylinder as a rigid immersion boundary within the flow. First, the flow around a square cylinder was simulated and we surveyed different flow patterns. The changes in the number of Strouhal and the Drag coefficient were investigated in different Reynolds. The flow around the two cylinders was simulated. It was observed that with the increase of Reynolds number and the gap between cylinders, the vortex shedding (Strouhal number) would increase.

A New Concept of Composite Material for High Speed Boats

The body of a craft is subjected to a series of complex loads, both static and dynamic. The global strength of such a body is given by the entire assembly of the hull, deck and strengthening framing system, all of these components working together [1]. Such a boat must first of all fulfill a very important requirement, namely: minimum hull resistance so that the engine power would primarily be used to achieve the highest possible speed. This can only be achieved if the hull wetted surface is as small as possible, which leads to the need to reduce the hull asembly weight. Thus, in this paper there are proposed and tested a number of nine lamination alternatives for the initial structure, designed as a sandwich system with different types of core materials. From the total nine alternatives, three of them are hybrid structures in which there are explored structural alternatives with several types of core materials. The verification of structures obtained with the proposed materials and lamination schedules was made using numerical methods both for naval hydrodynamics to determine loads and for naval structures for global body strength and analysis.