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Selected research issues of prototype floating systems

Derewońko Agnieszka, Krasoń Wiesław

Acta Mechanica et Automatica

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2024

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Vol. 18, no. 2

204--211

EN

The paper presents a solution that can be used as a temporary supplement to the existing infrastructure in cases of natural disasters, during structure or bridge repair, in military applications and in areas where it is necessary to provide a floating system crossing. The genesis of the proposed structure and its development, as well as examples of applications of the basic module, referred to as the river module – the floating cassette with the pneumatic pontoon – are presented. The original solutions, such as the bow–stern modules, designed using modern, light and durable materials acting as deflectors, are also described. Examples of the use of floating structures composed of identical/repeatable modules–cassettes are shown. The results of experimental tests of two prototype river modules sets are presented as a validation for numerical studies. Selected aspects of static, kinematic and dynamic analyses using finite element and multibody simulations are presented. The numerical simulation of the prototype floating bridge with an assessment of the impact of clearances and an estimation of the kinematic parameters of the floating ribbon with various configurations are described.

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Structural design and selected aspects of numerical simulations of a prototype container-platform for intermodal transport

Krasoń Wiesław, Dobrowolski Daniel

Journal of civil engineering and transport

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2022

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Vol. 4, No. 3

57--66

EN

The object of the research is a cheap, easy to build basic module with dimensions corresponding to typical railway containers. Such structures can be used to support the intermodal rail-road transport of wooden and metal logs. The basic structure and one assembled from two or more platforms with various longitudinal dimensions ensures high mobility resulting from the modular structure and the possibility of selecting transport configurations as well as the use of various forms of loading - unloading, including: typical crane operations, the use of forklifts or hook winches. The use of a platform-container will eliminate the need to repeat the operation of individual loading or unloading of each unit of the transported load e.g. a single block of wood, a bundle of bars, as a metal log, a single pipe, during each reloading operation - from the place of logging, production, storage, etc. The paper presents selected problems of the preliminary design and numerical strength tests of a single base module of the platform in a prototype version with dimensional equivalent of a 10'-foot railway container.

PL

W pracy przedstawiono wybrane problemy wstępnego projektowania pojedynczego modułu bazowego platformy, odpowiednika wymiarowego 10’ stopowego kontenera kolejowego w wersji prototypowej. Badania wytrzymałościowe innowacyjnej konstrukcji wspomagane są metodami numerycznymi. Omówiono metodykę takich badań z wykorzystaniem MES i metod multibody MBS, zastosowane modele numeryczne oraz wybrane wyniki symulacji komputerowych odpowiadających krytycznym, najbardziej wytężonym wariantom eksploatacyjnym zastosowań platformy np. do załadunków hakowych.

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Evaluation of the influence of friction in a multi-leaf spring on the working conditions of a truck driver

Hryciów Zdzisław, Krasoń Wiesław, Wysocki Józef

Eksploatacja i Niezawodność

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2021

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Vol. 23, no. 3

422--429

EN

This article presents a simulation study of the suspension system in a vehicle that weighs approximately 12 tons (class N2). The authors have tested the influence of experimentally determined values of friction coefficients on the energy dissipated in the multi-leaf spring. The study was carried out using finite element analysis with LS-DYNA software. A nonlinear vibration model of the complete spring was developed, including the variable friction forces between the leafs. The model takes into account the sprung and unsprung mass of the chassis. Numerical tests were carried out using three different coefficients of friction (determined experimentally) for a selected speed of the car. Random realizations of the road micro-profile (type A, B, C) recommended by ISO 8608 were used. The results of the tests were presented in the form of acceleration curves in the vertical direction, comparative plots of daily vibration exposure A(8) and vibration transmission coefficient (T), and the distributions of RMS acceleration in frequency of one-third octave bands. This data was used to assess the quality of the vibration isolation system between the front suspension of the vehicle and the driver’s seat.