Browsing by Author "Matachowski, Filip"

Now showing 1 - 7 of 7

Access status: Open Access ,
Assessment of integrity of operating gas pipelines
(Wydawnictwa AGH, 2018) Ładecki, Bogusław; Matachowski, Filip; Bednarz, Stanisław
Gas pipelines that have been in operation for many years require supervision, taking into account the places and conditions of their usage. The currently applicable normative regulations do not fully determine the scope of the integrity control of such gas pipelines. The standards provide general guidelines for monitoring corrosion phenomena in pipelines, allowing the use of simplified strength patterns based on a flat state of stress, in actuality, real objects usually have complex three-dimensional structures. Such an approach may be a reason for committing significant errors in determining the state of stresses and strains in the construction of pipelines, which is a significant problem in assessing the integrity of pipelines (when combined with the lack of a formulation of the appropriate admission criteria). This paper presents a methodology for assessing the integrity of pipeline structures operating at ambient temperatures based on conducting comprehensive measurements of wall thickness defects (in connection with performing necessary defectoscopy tests). The results of these measurements and non-destructive tests are the basis for the analysis of stress strength and MES deformation based on the verified real geometry as well as the method of supporting the pipelines. The information obtained on this basis regarding the pipeline structure areas of the highest efforts is the basis for selecting the critical areas of pipeline construction for which they should be repaired or modernized, or a monitoring program should be developed using non-destructive tests.
Access status: Open Access ,
Designing folding wall box pallets
(2014) Wolny, Stanisław; Ładecki, Bogusław; Matachowski, Filip
Designing of modern box pallets with folding walls, which are used for example to transport tires, requires fulfilment of a number of performance requirements. Such pallets, adapted to be moved by forklifts, are stored or transported without loading with walls folded, and during operation they are put together in the piles of a few pieces and braced by the transport belts. Difficult operating conditions are related to necessity to provide resistance of construction of a pallet or their pile on: bending, piling, stability, hitting in case of a free-fall, lifting by forklift, as well as the resistance to horizontal strokes by both edges and legs. In order to meet the above mentioned requirements, it is necessary to implement the relevant tensile FEM analyses, which are then reviewed by the relevant experimental testing. The paper discuss the requirements specified by standards for designing of the above mentioned pallets and presents FEM results in the process of pallets' designing.
Access status: Open Access ,
Evaluation of the state of stress in structural components of a screen separator
(2010) Wolny, Stanisław; Banaszewski, Tadeusz; Dzik, Stanisław; Matachowski, Filip
This study summarises the results of FEM analysis of the state of stress generated in structural components of a PZ3R screen separator under the typical operating conditions. Simplifications underlying the numerical analysis were verified by measuring the stresses in selected parts of the machine. Resistance test data indicated the directions for further modifications of structural elements of the screen separator, at the same time confirming the adequacy of these tests and emphasising the importance of the sequence of the applied tests.
Access status: Restricted ,
Ocena wielkości reprezentatywnego elementu objętości miedzianej pianki o szkielecie wypukłym i wklęsłym
(Data obrony: 2017-01-25) Natonik, Karol
Wydział Inżynierii Mechanicznej i Robotyki
Access status: Restricted ,
Opracowanie kryteriów projektowania wybranych elementów nośnych naczynia wydobywczego
(Data obrony: 2012) Matachowski, Filip
Wydział Inżynierii Mechanicznej i Robotyki
Opracowanie kryteriów projektowania elementów nośnych górniczego naczynia wydobywczego wymaga określenia rzeczywistych obciążeń elementów konstrukcyjnych tegoż naczynia w czasie normalnego cyklu pracy. W tym celu niezbędnym było poznanie obciążeń elementów nośnych konstrukcji naczynia wydobywczego, w aspekcie wyznaczenia sił pionowych (wzdłużnych) w zawieszeniach naczynia i lin wyrównawczych oraz sił poziomych, sił wzajemnego oddziaływania naczynia i zbrojenia. Kolejnym etapem było określenie wytężenia w elementach konstrukcyjnych naczynia wydobywczego z uwzględnieniem maksymalnych wartości tych sił, co przeprowadzono dla dwu konstrukcji skipów o udźwigu 17 Mg i 33 Mg. Wyniki przeprowadzonych analiz (dynamicznych i wytrzymałościowych) oraz przeprowadzonych pomiarów weryfikujących na obiektach rzeczywistych, pozwoliły na opracowanie kryteriów wymiarowania elementów konstrukcyjnych naczynia wydobywczego.
Access status: Open Access ,
Problems with rectification of hoist supports on the example of a semi-portal bridge-crane with a lattice structure
(2014) Ładecki, Bogusław; Matachowski, Filip
The long period and conditions of operation are the cause of various types of severe damage to cranes used in the steelworks industry. Among the more dangerous and difficult to eliminate crane damage types, there is excess durable deflection of its supports from vertical axis. The object of the study is the semi-portal grab bridge-crane with steel lattice structure, for which deflection of a fixed support was detected that several times exceeded permissible values. For this crane, rectification was performed aimed at bringing fixed supports to the vertical line by stabilisation of the corrected location of the bearing structure of the crane using additional angle braces. The analysis of periodical geodetic measurements of the crane structure showed insufficient effect of the rectification, whereas loss of stability of some rods in the fixed support was detected. The study involved the FEM strength analysis of the crane, which revealed that the applied rectification method caused redistribution of forces in the rods of the fixed support, resulting in the loss of stability of some rods of the support, thus questioning the effectiveness of the rectification method applied.
Access status: Open Access ,
Strength analysis of a gantry crane of a coating structure
(2012) Ładecki, Bogusław; Badura, Sławomir; Matachowski, Filip
Gantry cranes with coating construction are used in Polish steel industry much less than truss bridges. For several bridges, which span and the supports have coating construction, there were made series of non-destructive testing, which revealed the presence of numerous fatigue cracks: in the area of a beam pad, the coating, as well as other elements of their supporting structure. Periodically carried out repairs and strengthening of bridges have not eliminated the problem of the emergence of more fatigue cracks. The analysis of FEM, verified by extensometer measurements of strains, gave the basis to designate the most strenuous areas of the construction. Gathered results of periodic non-destructive testing, combined with obtained results of FEM analysis, were the basis for designing appropriate reinforcements and indication the scope of conducting non-destructive testing of considered construction of bridges with coating.