naval engineering
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2021 ◽  
Vol 1201 (1) ◽  
pp. 012046
Author(s):  
S P Zaoutsos

Abstract The use of aluminium sandwich panels has been increased in a certain number of engineering applications from infrastructure systems and transportation to aircraft and naval engineering. Due to their structural efficiency these materials are ideal for applications where ratio of strength to weight is of crucial importance. In the current study the investigation of the strength characteristics of aluminium sandwich panels with aluminium honeycomb core and different types of skins is performed using both analytical models and experimental procedures. A series of strength tests such as tension, shear, three point bending and double cantilever beam were conducted on aluminium honeycomb-cored sandwich panel specimens with five different skins in order to examine the mode of failure and the mechanical behaviour of the structural elements. The experimental findings are compared to theoretical values while an attempt for the explanation of the mechanisms leading to failure such as buckling, delamination or debonding between core and skins is performed. The results occurring from the study are very useful for the enhancement of the mechanical behaviour of sandwich constructions, thus more intensive work must be carried out in order to understand the physical mechanisms leading to strength characteristics of sandwich panels.


Author(s):  
Nikolay Igorevich Krizhanovsky ◽  
Svetlana Mikhailovna San'kova

The subject of this research is the early life of M. O. Menshikov – one of the ideologists of the Russian nationalism of the early XX century and leading publicist of the largest all-Russian newspaper “Novoe Vremya”. The goal consists in full reconstruction of the conditions of his childhood and early youth. The methods of deduction, induction, comparative and prospective analysis were used for reconstructing separate circumstances of the initial stage of development of Menshikov’s personality and holistic biographical picture. The synthesis of objective analysis of the facts with subjective assessments of the events described by Menshikov himself in his diaries and articles allowed depicting the external circumstances of his youth, as well as reconstruct the peculiarities of development of his inner world and social reflection. The conclusion is made that a range of the core themes of Menshikov's publicistic writing, which were covered in the newspaper “Nedelya” and later in “Novoe Vremya”, and ultimately brought him popularity, take roots in his childhood and early youth: “family relations”, “upbringing and education”, “pursuit of belonging”, “finding  happiness through harmony with the world”. These topics were covered by Menshikov based on the rich life experience, a long path from the poor peasant family to the cadet of Naval Engineering School in Kronstadt. The fact that he was able to understand the problems  of the commoners made him closer to the reader. The provided biography is currently the most detailed study of the early life of M. O. Menshikov's; many facts are introduced for the first time. The article also presents additional empirical material on the history of childhood, elementary and secondary education in Russia of the late XIX century.


2021 ◽  
Vol XXIV (1) ◽  
pp. 130-138
Author(s):  
BORDIANU Adelina

In this paper one analyses different low passive filters that are used successfully in naval engineering applications. Filters are successfully used in marine control systems, supply systems on board or for reduction of harmonic distortion. The advantages and disadvantages of the filters were also presented. Using Matlab and Simulink the filters electrical circuits (3 rd and 5 th order passive filters Chebyshev and Elliptical are considered in this paper) were analysed.


2021 ◽  
Vol 4 (3) ◽  
pp. 1-16
Author(s):  
Giulio Ortali ◽  
◽  
Nicola Demo ◽  
Gianluigi Rozza ◽  

<abstract><p>This work describes the implementation of a data-driven approach for the reduction of the complexity of parametrical partial differential equations (PDEs) employing Proper Orthogonal Decomposition (POD) and Gaussian Process Regression (GPR). This approach is applied initially to a literature case, the simulation of the Stokes problem, and in the following to a real-world industrial problem, within a shape optimization pipeline for a naval engineering problem.</p></abstract>


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