Mathematical Model for Assessing the Reliability of Water Supply Networks

Postnova, Elena; Runev, Evgeniy

doi:10.1007/978-3-030-96380-4_38

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…Figure 2 shows a graph of the normalized spectral density of the oscillatory process of the pipeline section under study during the passage of the wheelset of the TEM-2 locomotive bogie. Applying formulas (3), ( 4), (7) and by performing integration, we get the following dependency For harmonic oscillations, the acceleration amplitude and the displacement amplitude are related by the following expressions:…”

Section: Discussionmentioning

confidence: 99%

“…The consequences of the influence of vibrodynamic influences on the working condition of pipelines are inextricably linked with their reliability. In [7], the reliability of pipelines using continuous Markov chains was evaluated. The proposed model made it possible to objectively assess the reliability of pipelines for the purpose of long-term forecasting and ensuring their operable condition for the entire period of operation.…”

Section: Introductionmentioning

confidence: 99%

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Rolling stock vibrodynamic impact model on railway pipelines

Postnova

Runev

2023

E3S Web Conf.

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The present paper presents the rolling stock vibrodynamic impact model on railway pipelines, obtained on the basis of experimental studies conducted under field conditions at a railway station. The experimental research program provided for the determination of the effect of vibration-dynamic effects of rolling stock on the working condition of pipes and butt joints by conducting vibration-measuring work on the investigated section of the railway pipeline during the passage of various series of locomotives. The proposed modeling method makes it possible to obtain a correlation function of the oscillatory process of a railway pipeline, on the basis of which a spectral density is constructed to identify the amplitude-frequency range at which a stable resonance region occurs, leading to the destruction of the pipeline.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rolling stock vibrodynamic impact model on railway pipelines

Postnova

Runev

2023

E3S Web Conf.

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“…Обработка и анализ записей колебательного процесса испытательного участка трубопровода при движении подвижного состава [2] позволили выявить основные характеристики случайных процессов: корреляционную функцию и спектральную плотность. Эти характеристики совместно определяют внутренние свойства и структуру колебательного процесса: корреляционная функция -во временной области, спектральная плотность -в частотной области [3].…”

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Factor Model of Vibrodynamic Load Effect on Pipeline Reliability

Postnova

Runev

2023

Proceedings of Petersburg Transport University

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Purpose: To build a factor model of vibrodynamic loading influence on pipeline reliability based on the results of laboratory tests carried out taking into account the amplitude-frequency characteristics of the vibration process of the operating pipeline, obtained during full-scale tests at the railway station. On the basis of the factor model to determine the most significant factors affecting the reliability of pipelines under the action of vibrodynamic loading and to propose ways to improve their reliability. Methods: The plan of fractional factor experiment of 25-2 type was used to carry out laboratory tests of pipeline reliability under the influence of stresses of familiar constant cycle. The experiments were carried out on a test bench with a pulsating cylinder of type PC with a maximum load of 200 kN. Voltages were applied to the pipeline under test from control panels of static (from soil) and dynamic (from rolling stock) loads. Impulse shape was sinusoidal, the closest to natural one, cycle frequency — 300 c/min. The regression equation coefficients were calculated on a computer using the multiple linear correlation program. The significance of the regression coefficients was assessed by Student's test. Fisher's test was used to check the adequacy of the model to the experimental data. Adequacy of the regression equation to the physics of the phenomenon was tested using Student's test. Results: Tests of the pipeline with application of fractional factor experiment of 25-2 type allowed to build a factor model of the process under study in the form of polynomial of the first degree. It has been established that the main factors influencing pipeline reliability under vibrodynamic loading are train load, vibration amplitude of the pipeline and the depth of its embedding. The vibration frequency of the pipeline has no significant influence on the pipeline reliability. However, from the regression equation it follows that the pipeline vibration frequency depends on its diameter. Practical significance: The equation of linear regression is obtained, which is transformed by switching from coded values of factors to natural values, which can be used for practical purposes to determine the intensity of failures and the duration of operation of pipelines between failures.

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Experience in construction and operation of sewerage networks in areas with deep seasonal ground freezing across different regions of the Russian Federation

Mayny,

Chernikov,

Tvardovskaya

2024

E3S Web of Conf.

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Reviewing the experience in construction and operation of sewerage networks in areas with deep seasonal ground freezing across different regions of the Russian Federation. Methods: analyzing the sewer pipeline laying, in-situ observations of wastewater temperature regime at sewer outlets from residential buildings. Results: designs of sewer pipelines laid in different regions are presented, as well as their dependence on the depth of seasonal ground freezing in different regions of the Russian Federation. The actual values of sewage water temperature at sewage outlets from residential buildings are established. Practical significance: In a number of regions the laying of sewerage pipes at a depth of 1.5-1.8 m led to normal and stable operation of sewerage pipelines. In terms of capital expenditures, sewer pipelines account for more than 50% of the estimated cost of the entire wastewater disposal system. Their operation claims a significant share of the costs.

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Mathematical Model for Assessing the Reliability of Water Supply Networks

Cited by 4 publications

References 15 publications

Rolling stock vibrodynamic impact model on railway pipelines

Rolling stock vibrodynamic impact model on railway pipelines

Factor Model of Vibrodynamic Load Effect on Pipeline Reliability

Experience in construction and operation of sewerage networks in areas with deep seasonal ground freezing across different regions of the Russian Federation

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