Truss Harbor Cranes Modal Design Elements Research

Żółtowski, Mariusz; Liss, Michał; Żółtowski, B.; Melcer, Jozef

doi:10.1515/pomr-2015-0076

Cited by 8 publications

(10 citation statements)

References 7 publications

(11 reference statements)

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“…Signals that are reflected from the previous boundaries of the separation of the two media in the reverse passage of the reflected signal can be ignored based on the following considerations [16,17,18]. As studies have shown in the previous section, the reflection coefficients differ from the transmission coefficients by approximately one order of magnitude and the re-reflected signals, given the attenuation of the signals, will not create any appreciable effect on the total signal.…”

Section: Presenting Main Materialsmentioning

confidence: 99%

Diagnosis of multilayer structures and composite parts by multifrequency phase detection

Musiał

Horiashchenko

et al. 2021

MATEC Web Conf.

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The article considers the issue of diagnosing the condition of multilayer elements and structures. Probing methods are considered. A multiphase detection method has been proposed to generate diagnostic information that allows the reflected signals from several consecutive layers to be obtained. The reflection distance is determined for each layer. The presentation of a two-dimensional model of structural sounding in the presence of two objects of study was considered. The three-dimensional model of search of objects of research of concrete designs considered in work provides probing by spherical waves of a detail, measurement of phase shifts of signals reflected from internal objects of research in three points. Division by means of one of mathematical models of signals are reflections from each object of research and determination of coordinates of objects of research and can by means of the mathematical model was represent. The equipment of a measuring instrument was developed to study the analytical multifrequency phase method of distance measurement. This system can be used to diagnose defects in multilayer structures that can transmit radio waves. Also it can be used for quality control of the put coverings and for the analysis of thickness of composite materials, isolation layers in the equipment.

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Section: Presenting Main Materialsmentioning

confidence: 99%

Diagnosis of multilayer structures and composite parts by multifrequency phase detection

Musiał

Horiashchenko

et al. 2021

MATEC Web Conf.

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“…The effectiveness of the enterprise, measured by economic results, is directly influenced by both downtime of technological devices caused by failure of their components and planned maintenance and reconstruction of the utility (repair) potential [6]. Due to the unforeseen epidemiological situation, many of the transport companies began to generate much higher costs due to the necessity to maintain sanitary requirements, disinfection etc., and to bring lower profits due to the decrease in the number of users [7][8][9]. The number of vehicle kilometers performed in individual quarters in 2019 and 2020 are at a similar level (in 2020 they were enforced by sanitary regulations limiting the number of passengers on public transport).…”

Section: Exploration Processesmentioning

confidence: 99%

Impact of the epidemiological situation in Poland in 2020 on the public transport system

Landowski

Kuliś

2021

MATEC Web Conf.

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The use of public transport means is characterized by periodically changing phases. For a unit performing a transport task, it is important to have tools that enable the analysis and forecasting of the state of the system and facilitating decisions regarding the control of the process being carried out. During the mishap of the epidemic, many legal solutions were imposed that forced changes in the process of using public transport. The article below describes the changes and their impact on the situation in Poland.

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“…Resistance to wear of materials is also largely determined by friction processes. In work [10][11][12], the parameters of the friction process in the complex are presented in the model of wear proposed by the authors. The importance of laboratory and theoretical studies of friction parameters for practical applications follows from the literature review.…”

Section: Literature Reviewmentioning

confidence: 99%

Diagnostics – Experimental Analysis of Friction Pairs at Stick – Slip Sliding

2019

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The movement of parts of friction pairs with small quantities and displacements is the cause of the so-called stick-slip movement. This is due to the instability of the process of formation and destruction of adhesive contact between the surfaces. In this case, the lubricant has a decisive influence on the processes of friction in the contact. In this work, based on the diagnostic and experimental complex, the dependences of the magnitude of the friction force on displacements for various lubricants were obtained. Statistical characteristics of the scattering parameters of friction force are obtained to estimate the vibrations of a moving body. It is received that the dispersion of the friction force relative to the average value decreases with increasing load and with dry and lubricated contact. On the basis of the obtained experimental results, it is possible to establish some quantitative characteristics of such a movement: the number of oscillations (jumps) per unit of time; the average movement in a contact before a shift in a contact; the average resistance force in a contact before a shift. The correct selection of lubricant and loads ensures minimum values of vibrations of the friction units of machines. This consequently improves the positioning accuracy of the machines.

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Truss Harbor Cranes Modal Design Elements Research

Abstract: ABSTRACT

Cited by 8 publications

References 7 publications

Diagnosis of multilayer structures and composite parts by multifrequency phase detection

Diagnosis of multilayer structures and composite parts by multifrequency phase detection

Impact of the epidemiological situation in Poland in 2020 on the public transport system

Diagnostics – Experimental Analysis of Friction Pairs at Stick – Slip Sliding

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