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Comparative studies of the seatings of propulsion plantsand auxiliary machinery on chocks made of metal and cast from resin. Part II. Mounting on cast resin chocks

Grudziński Paweł, Konowalski Konrad

Polish Maritime Research

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2020

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nr 1

126--133

EN

This article is Part II of the paper containing a description and results of the experimental studies of the deformations, friction processes and structural damping that occur in the foundation bolted joints of propulsion plant components and auxiliary machinery installed on sea-going ships. Part I of this research work presents an analysis of the rigid mountings of machines and devices to the foundations on steel or resin chocks, and explains the need to carry out relevant research in this area. It also presents the description and results of experimental studies carried out for a foundation bolted joint with a conventionally used steel chock. Part II (this article) contains a description and results of similar studies carried out for a foundation bolted joint with a modern chock – cast from epoxy resin compound (EPY), specially developed for this purpose. Then, a comparative analysis of the results obtained for both bolted joints in question was made and the foundation chocks of the poured-in-place resin compound were demonstrated to better fulfill their technical tasks than the steel chocks traditionally used for this purpose.

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Comparative studies of the seatings of propulsion plants and auxiliary machinery on chocks made of metal and cast of resin. Part I. Mounting on steel chocks

Grudziński Paweł, Konowalski Konrad

Polish Maritime Research

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2019

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nr 4

142--148

EN

This paper presents a description and the results of experimental studies of the deformation, friction and structural damping occurring in foundation bolted joints of propulsion plant components and auxiliary machinery that is rigidly mounted on sea-going ships. The rigid mounting of these devices to the ships’ structural foundations can be implemented in a traditional way, i.e. on chocks made of metal (usually of steel), or in a modern way, i.e. on chocks cast of resin, specially designed for this purpose. The main goal of this study is to perform a comparative analysis of these two solutions and to give a scientific explanation for why chocks cast of resin perform better in machinery seatings than the steel chocks traditionally used for this purpose. The paper consists of two parts. Part I presents the details of the rigid mountings of machinery to the foundations, and contains the results of experimental studies performed on a model of a foundation bolted joint with a traditional steel chock. Part II contains the results of similar studies carried out for a model of a bolted joint with a modern chock cast of resin. Next, a comparative analysis and evaluation of the results obtained for both investigated bolted joints was carried out, and conclusions were formulated to highlight important aspects of the problem from the point of view of science and engineering practice.

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The identification and elimination of interference in pressure course in the cylinders of internal combustion engines measured under marine power plant exploitation conditions

Monieta J.

Zeszyty Naukowe Akademii Marynarki Wojennej

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2015

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R. 56 nr 2 (201)

47--55

EN

This article presents some of the problems which occur in the course of transforming signals of work process parameters in the testing of internal combustion engines, when power is supplied to a measuring appliance from a shipboard system under certain conditions and on the same measuring path. It characterizes the interference which has an influence on the results of measurements of pressure course in a diagnostics test conducted under marine conditions. In order to identify and to eliminate interference the wavelet analysis of signals of pressure in cylinders of internal combustion engines was carried out. As a result of the analyses it was found that the sources of interference are: electricity grid, electrical power equipment, indicator channels and valves, as well as sensors and measuring sets.

PL

W artykule przedstawiono problemy występujące w czasie przetwarzania sygnałów parametrów procesów roboczych w trakcie badań silników spalinowych, przy zasilaniu aparatury pomiarowej z sieci okrętowej, w określonych warunkach i tym samym torze pomiarowym. Scharakteryzowano zakłócenia mające wpływ na wyniki pomiarów przebiegu ciśnienia w badaniach diagnostycznych prowadzonych w warunkach eksploatacji statków morskich. W celu identyfikacji, a następnie eliminacji zakłóceń zastosowano analizę falkową sygnałów ciśnienia w cylindrach silników spalinowych. W wyniku wykonanych analiz przebiegów czasowych i widmowych oraz ich dekompozycji falkowych ustalono, że źródłem zakłóceń są: sieć zasilająca i urządzenia energetyczne, kanały i zawory indykatorowe oraz czujniki i układy pomiarowe.