Assessment of the Condition of Hoisting Ropes by Measuring their Geometric Parameters in a Three-Dimensional Image of their Surface / Metoda Oceny Stanu Lin Wyciągowych Poprzez Pomiar Parametrów Geometrycznych Na Trójwymiarowym Obrazie Ich Powierzchni

Olszyna, Grzegorz; Sioma, Andrzej; Tytko, A.

doi:10.2478/amsc-2013-0045

Cited by 19 publications

(1 citation statement)

References 3 publications

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“…These ropes are subject to several wear processes. They wear as a result of wire fatigue, corrosion, loss from abrasion [1], deformation caused by changes in their geometry [2], and rope core and lubrication damage [3]. Fatigue manifests in wire breakage, and the standard method of representing this process is to plot the number of wire breaks as a function of rope running time or number of running cycles.…”

Section: Introductionmentioning

confidence: 99%

Some Stochastic Aspects of Safety Work of Steel Wire Ropes Used in Mining-Shaft Hoists

Tytko

Olszyna

Kocór³

et al. 2023

Sustainability

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In most rope transport devices, the used steel wire ropes are replaced with new ones after working for a certain period of time, or after reaching the acceptable level of wear. The operational safety of the entire system depends on the correct diagnosis of the condition of the working wire rope. This is not easy, because the working lives of the ropes are varied, and their wear depends on many factors, including random ones. This article presents three different aspects of the work of steel ropes in mining-shaft hoists. What they have in common is a stochastic approach to interpreting the level of rope wear. The process of progressive wear due to fatigue breaking of wires is presented as the first example. This process is non-linear with a strong upward trend, which, in the final stage, turns into a phase often referred to as “explosive”. The rate at which subsequent wire breaks appear is influenced by numerous random factors, e.g., in the form of different methods and materials from which a given rope is constructed. However, the character of the progressing wear process is most affected by the random distribution of stresses experienced by individual wires and the randomly variable nature of the working environment. The second aspect presented in this article is an attempt to determine the probability of wire breaks of the rope. This was presented on the example of wear of the hoisting rope of a mining-shaft hoist. The last aspect of a stochastic nature, which is discussed in the article, is the issue of separating individual components of this distribution from the multimodal distribution describing the tensile strength of the rope wires, possibly of a normal character. Modern methods of analysis allow such distributions to be assigned to specific structural elements of the wire rope. This gives information about which structural elements of the rope wear faster or unusually and, consequently, determine its strength. This was presented on the basis of the results of strength tests of the wires of the mining-shaft hoist rope, which broke due to excessive corrosion wear of the inner strands. The presented examples explain only a short part of randomness in the description of working ropes, but the intention of the authors is to draw the attention of the personnel responsible for their safe operation to unavoidable random factors.

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Section: Introductionmentioning

confidence: 99%

Some Stochastic Aspects of Safety Work of Steel Wire Ropes Used in Mining-Shaft Hoists

Tytko

Olszyna

Kocór³

et al. 2023

Sustainability

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Vision-based algorithms for damage detection and localization in structural health monitoring

Dworakowski

Kohut

Gallina

et al. 2015

Struct. Control Health Monit.

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Summary Deflection curve can be used to detect and localize damage in civil engineering structures. In this paper, a vision‐based method applied for in‐plane displacement field measurement of cantilever beams is presented. The deflection curve of the analyzed structure is computed by means of the digital image correlation. Damage is introduced into the structure. Resulting deflection curves are used as an input to the novel damage detection algorithms: line segments method and voting method. The algorithms are then compared with the second derivative method and assessed through the probability of detection procedure. Copyright © 2015 John Wiley & Sons, Ltd.

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The vision analysis of a McKibben pneumatic artificial muscle

Lepiarz

2014

Proceedings of the 2014 15th International Carpathian Control Conference (ICCC)

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The McKibben pneumatic artificial muscles are biomimetic actuators, which contract and generate force when inflated. They are lightweight, robust and have very high generated force to weight ratio. Because of these features they are widely used in robotics, orthotics and prosthetics. However, generated force has nonlinear character and is dependent on both pressure inside of a muscle and its contraction. It behaves somewhat like a spring. As a result, the generated force of pneumatic artificial muscle is hard to control.This study presents an algorithm for vision measurement of an operating pneumatic artificial muscle. The diameter and contraction of an artificial muscle is measured under different operating pressures. The purpose of this study is the analysis of a vision system as an alternative tool for measuring characteristics of pneumatic artificial muscles in real applications. One of the advantages of a vision system is a fact, that single camera sensor is able to measure more than one artificial muscle. Control algorithms of pneumatic muscles use PWM method to control pressure. To achieve PWM method very fast 2/2 pneumatic valves are used to control input and output flow. In this study a pneumatic muscle is used to control slider position. A vision analysis of a such system is presented. To capture images of fast changing process a high-speed camera is used.

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Assessment of the Condition of Hoisting Ropes by Measuring their Geometric Parameters in a Three-Dimensional Image of their Surface / Metoda Oceny Stanu Lin Wyciągowych Poprzez Pomiar Parametrów Geometrycznych Na Trójwymiarowym Obrazie Ich Powierzchni

Cited by 19 publications

References 3 publications

Some Stochastic Aspects of Safety Work of Steel Wire Ropes Used in Mining-Shaft Hoists

Some Stochastic Aspects of Safety Work of Steel Wire Ropes Used in Mining-Shaft Hoists

Vision-based algorithms for damage detection and localization in structural health monitoring

The vision analysis of a McKibben pneumatic artificial muscle

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