The acoustic evaluation of wire ropes immersed in water

Casey, N.F.; Holford, Karen Margaret; Taylor, Jack L.

doi:10.1016/0308-9126(87)90406-8

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Events (a number of counts associated with the same cause) increase with the size of different types of defects in bearings. Evidence of degradation within gearboxes produced similar acoustic results [20] showed for example that AE frequency ranges extend from 25 kHz to hundreds of kHz in some cases. Investigations of wire fracturing in air identified frequencies of 0-100 kHz [21], with narrow-band peaks for individual breaking events, of amplitudes varying with the extent of the damage to the wires.…”

Section: Acoustic Emissions From Marine Renewable Energy Devicessupporting

confidence: 58%

Monitoring the condition of Marine Renewable Energy Devices through underwater Acoustic Emissions: Case study of a Wave Energy Converter in Falmouth Bay, UK

et al. 2017

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Maintaining the engineering health of Marine Renewable Energy Devices (MREDs) is one of the main limits to their economic viability, because of the requirement for costly marine interventions in challenging conditions. Acoustic Emission (AE) condition monitoring is routinely and successfully used for land-based devices, and this paper shows how it can be used underwater. We review the acoustic signatures expected from operation and likely failure modes of MREDs, providing a basis for a generic classification system. This is illustrated with a Wave Energy Converter tested at Falmouth Bay (UK), monitored for 2 years. Underwater noise levels have been measured between 10 Hz and 32 kHz throughout this time, covering operational and inactive periods. Broadband MRED contributions to ambient noise are generally negligible. Time-frequency analyses are used to detect acoustic signatures (60 Hz-5 kHz) of specific operational activities, such as the active Power Take Off, and relate them to engineering and environmental conditions. These first results demonstrate the feasibility of using underwater Acoustic Emissions to monitor the health and performance of MREDs.

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Section: Acoustic Emissions From Marine Renewable Energy Devicessupporting

confidence: 58%

Monitoring the condition of Marine Renewable Energy Devices through underwater Acoustic Emissions: Case study of a Wave Energy Converter in Falmouth Bay, UK

et al. 2017

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“…Due to various failure issues in subsea pipelines, monitoring has been an increasing challenge that needs to be tackled, such as corrosion and the need for composite pipe repairs [110][111][112][113]. Earlier studies have been conducted on acoustic measurements and monitoring [114][115][116][117][118]. Some of these studies include inspection and monitoring of flexible line systems like flexible pipes [119,120].…”

Section: Why Is Monitoring Important?mentioning

confidence: 99%

Guidelines on Composite Flexible Risers: Monitoring Techniques and Design Approaches

et al. 2022

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The increasing energy demand has led to more explorations in the oil and gas industry. To achieve this, marine risers and pipelines are used to convey fluid and other resources to meet the increasing demand. In recent years, hybrid flexible composite risers have become more adaptable. Flexible risers have already proven to be a popular riser solution for various floating production systems in shallow to deepwater in many parts of the world due to their good dynamic behaviour and dependability. The hybrid flexible composite riser is made up of numerous layers of plastics, flexible pipes, composites, and steel. Some innovative monitoring methods, such as Fiber Optics Bragg Gratings (FBG), are based on a clamped composite structure with embedded optical fibre. This study presents characteristics of the monitoring techniques of composite flexible riser technology. The advantages of the monitoring techniques include aiding composite riser measurements, recording data from riser deformation, improving integrity assurance, and dependability of design from stable readings. It also proposes some design approaches as guidelines that are advised, with some policy implications.

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“…and axially loaded cable at the end of which the centrated on the acoustic emission amplitude distributions and the frequency components of singular electronic box signals (waves) are picked up (e.g. [28][29][30]). In this context, the works of Casey wire fractures within a wire rope and concluded that high amplitude hits could be associated with et al (e.g.…”

Section: Equations Of Motion Dependent On Both the Cable Materials And Con-mentioning

confidence: 99%

“…In this context, the works of Casey wire fractures within a wire rope and concluded that high amplitude hits could be associated with et al (e.g. [28,29]) may be mentioned, which con- wire fractures -attaining a one-to-one correlation wire carrying a small fraction of the total axial load on the cable) the amplitudes and speeds of the between hits and wire breaks. However, in old and fully bedded-in cables in practice, the cable structure axial and torsional waves released by the fracture of an individual wire are governed (because of is compacted in such a way that (with an individual full-slip behaviour of newly manufactured cables.…”

Section: Equations Of Motion Dependent On Both the Cable Materials And Con-mentioning

confidence: 99%

Possible shortcomings of the calibration methods for certain non-destructive monitoring devices for helically wound steel cables

Raoof

Davies

2006

The Journal of Strain Analysis for Engineering Design

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• This is an article from the journal, Abstract: Coupled extensional-torsional behaviour of axially pre-loaded helically wound steel cables (wire ropes and/or spiral strands) under specific forms (i.e. unit-step, triangular, and half-sine) of impact loading are considered in some detail. The final closed-form formulations can handle both the no-slip and/or the traditionally used full-slip coupled extensional/torsional constitutive equations for helically wound cables, and describe the various characteristics of the resulting pairs of axial or torsional waves at any location along the cable with one end fixed against movement and the other end subjected to impact loading. By using extensive numerical results, which cover the full range of current manufacturing limits for the lay angle (with this being the sole controlling geometrical parameter as far as the axial/torsional stiffnesses are concerned), it is shown that significant differences exist between a number of axial/torsional wave characteristics, depending on whether the no-slip or the full-slip version of the constitutive relations is used in the analysis. It is demonstrated that modest increases in the magnitudes of the lay angles can lead to significant increases in the differences between the no-slip and the full-slip wave propagation characteristics. The present findings may have significant practical implications in relation to the currently adopted techniques used by industry for calibrating the electronic boxes, which are subsequently used as permanently installed devices, for the in situ detection of individual wire fractures under, say, fatigue loading associated with cable-supported structures.

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The acoustic evaluation of wire ropes immersed in water

Cited by 4 publications

References 4 publications

Monitoring the condition of Marine Renewable Energy Devices through underwater Acoustic Emissions: Case study of a Wave Energy Converter in Falmouth Bay, UK

Monitoring the condition of Marine Renewable Energy Devices through underwater Acoustic Emissions: Case study of a Wave Energy Converter in Falmouth Bay, UK

Guidelines on Composite Flexible Risers: Monitoring Techniques and Design Approaches

Possible shortcomings of the calibration methods for certain non-destructive monitoring devices for helically wound steel cables

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