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The Single Degree of Freedom Simulation Model of Underwater Explosion Impact

Grządziela Andrzej, Załęska-Fornal Agata, Kluczyk Marcin

Archives of Acoustics

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2020

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Vol. 45, No. 2

341--348

EN

The hulls of naval ships are exposed to forces and moments coming from internal and external sources. Usually, these are interactions that can be described mathematically by harmonic and polyharmonic functions. The shock of UNDEX type (underwater explosion) works completely differently and its time waveform is difficult to describe with mathematical functions as pressure vs. time. The paper presents a simplification of physical and mathematical models of 1-D kickoff pressure whose aim is performance the simulation of the external force of the detonation wave. The proposed models were verified and tuned on naval, sea trials. The main goals of the proposed models are to perform simulation calculations of the detonation pressure for different explosion charge weights from different distances of the UNDEX epicentre for the design process of machine foundation. The effects of pressure are transformed as impulses exposed on shock absorber mounted at light shock machine.

2

GMU Safety Interactive Platform Organization and Possibility of its Applications

Kuligowska E., Torbicki M.

Journal of Polish Safety and Reliability Association

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2018

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Vol. 9, No. 2

99--114

EN

The organization and a possibility of the Gdynia Maritime University (GMU) Safety Interactive Platform applications are described. The GMU Platform structure and main functions of its particular parts are presented. Moreover, the future plans about the usage and extension of the GMU Platform are shown.

3

Integrated Impact Model on Interconnected Critical Infrastructure Network Cascading Related to Its Operation Process

Blokus-Roszkowska A., Kołowrocki K.

Journal of Polish Safety and Reliability Association

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2017

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Vol. 8, No. 4

113--124

EN

In this paper we consider dependent Critical Infrastructures (CI) at variable operation conditions and present multistate approach to their safety analysis. The safety of dependent Critical Infrastructures at variable operation conditions is described. The local, equal and mixed load sharing models of dependency subjected to the operation process are introduced. The conditional safety functions at the particular operation states and the unconditional safety functions of a multistate series network with dependent assets, with dependent subnetworks and with dependent assets of its subnetworks according to LLS, ELS and MLS rules are determined. Furthermore, the all models of dependency are applied to safety analysis of a multistate parallel and “m out of n” network with dependent assets, parallel-series and “m out of l”-series network with dependent assets of their subnetworks at variable operation conditions.

4

Integrated Impact Model on Critical Infrastructure Safety Related to Its Operation Process and Climate-Weather Change Process

Kołowrocki K., Soszyńska-Budny J., Torbicki M.

Journal of Polish Safety and Reliability Association

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2017

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Vol. 8, No. 4

33--48

EN

The main aim of the paper is to define the operation and climate change influence on the safety of a critical infrastructure considered as a complex system in its operating environment. As the result, a general safety analytical model of a complex technical system under the influence of the operation process related to climateweather change process is proposed. Further, the conditional safety functions at the operation process related to climate-weather change process, the unconditional safety function and the risk function of the complex system at changing in time operation and climate-weather conditions are defined. Moreover, the mean lifetime up to the exceeding a critical safety state, the moment when the risk function value exceeds the acceptable safety level, the intensities of ageing of the critical infrastructure and its components and the coefficients of the operation and climate-weather impact on the critical infrastructure and its components intensities of ageing are proposed as the other significant safety indices for any critical infrastructure.

5

Integrated Impact Model on Baltic Port and Shipping Critical Infrastructure Network Safety Related to Its Operation Process…

Guze S., Kołowrocki K.

Journal of Polish Safety and Reliability Association

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2017

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Vol. 8, No. 4

77--102

EN

The main aim of the paper is the adaptation of the known methods for safety modelling related to the operation process for Baltic Port and Shipping Critical Infrastructure Network. To realize this goal, the description of the four critical infrastructure networks, i.e. Baltic Port, Shipping, Ship traffic and port operation, and finally Baltic Port and Shipping are provided. The basic notations for operation process and multi-state CIN safety analysis for them are introduced. Furthermore, the Baltic Port and Shipping Critical Infrastructure Network safety function and its risk function are proposed. The practically significant critical infrastructure network safety indices like mean lifetime up to the exceeding a critical safety state, the moment when the risk function value exceeds the acceptable safety level, the component and critical infrastructure network intensities of ageing/degradation and the coefficients of operation impact on component and critical infrastructure network intensities of ageing are presented for four CIs considered in the paper.