Accelerated reliability testing of articulated cable bend restrictor for offshore wind applications

Thies, Philipp R.; Johanning, Lars; Bashir, Imran; Tuk, Ton; Tuk, Marloes; Marta, Marco; Müller-Schütze, Sven

doi:10.1016/j.ijome.2016.05.006

Cited by 12 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In practice, bend stiffeners are used at both ends of the cable to protect it from over-bending and buckling; see [23] for an example. At the time this study was conducted, the design of the bend stiffener for the cable was not available.…”

Section: Stress and Fatigue Damage Evaluationmentioning

confidence: 99%

“…Their research provided insight into the failure mechanisms of power conductors, and the fatigue properties of the conductors were presented in S-N diagrams. Through accelerated reliability tests, Thies et al [23] investigated the fatigue life of a pipe bend restrictor, which is used to protect static submarine power cables used in offshore wind applications. Hansen-Zahl et al [24] found that the static configuration of umbilicals and risers has a marked impact on their vortex-induced vibrations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

2017

View full text Add to dashboard Cite

A case study of a point-absorber wave energy converter (WEC) system is presented. The WEC system forms an array, with several WECs located around a central hub to which they are each connected by a short, freehanging power cable. The objective of the study is to analyse the dynamic characteristics and estimate the fatigue life of the power cable which is not yet in use or available on the commercial market. Hence, a novel approach is adopted in the study considering that the power cable's length is restricted by several factors (e.g., the clearances between the service vessel and seabed and the cable), and the cable is subject to motion and loading from the WEC and to environmental loads from waves and currents (i.e., dynamic cable). The power cable's characteristics are assessed using a numerical model subjected to a parametric analysis, in which the environmental parameters and the cable's design parameters are varied. The results of the numerical simulations are compared and discussed regarding the responses of the power cables, including dynamic motion, curvature, cross-sectional forces, and accumulated fatigue damage. The effects of environmental conditions on the long-term mechanical life spans of the power cables are also investigated. Important cable design parameters that result in a long power cable (fatigue) service life are identified, and the cable service life is predicted. This study contributes a methodology for the first-principle design of WEC cables that enables the prediction of cable fatigue life by considering environmental conditions and variations in cable design parameters.

show abstract

Section: Stress and Fatigue Damage Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

2017

View full text Add to dashboard Cite

show abstract

“…Recertification is also important in creating a level playing field internationally, to avoid dynamics such as those observed in metal recycling with illegal exports and rogue operators that undercut quality undertakings and introduce high price dynamics that constrain investment [232]. Recertification is closely related to reliability testing [27], a concept that finds resonance within the offshore wind literature (e.g., [237,238]).…”

Section: Recertificationmentioning

confidence: 99%

A Framework and Baseline for the Integration of a Sustainable Circular Economy in Offshore Wind

Velenturf

2021

Energies

View full text Add to dashboard Cite

Circular economy and renewable energy infrastructure such as offshore wind farms are often assumed to be developed in synergy as part of sustainable transitions. Offshore wind is among the preferred technologies for low-carbon energy. Deployment is forecast to accelerate over ten times faster than onshore wind between 2021 and 2025, while the first generation of offshore wind turbines is about to be decommissioned. However, the growing scale of offshore wind brings new sustainability challenges. Many of the challenges are circular economy-related, such as increasing resource exploitation and competition and underdeveloped end-of-use solutions for decommissioned components and materials. However, circular economy is not yet commonly and systematically applied to offshore wind. Circular economy is a whole system approach aiming to make better use of products, components and materials throughout their consecutive lifecycles. The purpose of this study is to enable the integration of a sustainable circular economy into the design, development, operation and end-of-use management of offshore wind infrastructure. This will require a holistic overview of potential circular economy strategies that apply to offshore wind, because focus on no, or a subset of, circular solutions would open the sector to the risk of unintended consequences, such as replacing carbon impacts with water pollution, and short-term private cost savings with long-term bills for taxpayers. This study starts with a systematic review of circular economy and wind literature as a basis for the coproduction of a framework to embed a sustainable circular economy throughout the lifecycle of offshore wind energy infrastructure, resulting in eighteen strategies: design for circular economy, data and information, recertification, dematerialisation, waste prevention, modularisation, maintenance and repair, reuse and repurpose, refurbish and remanufacturing, lifetime extension, repowering, decommissioning, site recovery, disassembly, recycling, energy recovery, landfill and re-mining. An initial baseline review for each strategy is included. The application and transferability of the framework to other energy sectors, such as oil and gas and onshore wind, are discussed. This article concludes with an agenda for research and innovation and actions to take by industry and government.

show abstract

“…The mooring ropes used in the test are of similar material and construction, therefore the test results are deemed to be representative. Similarly, the loading has been carried out using accelerated testing with the assumption that the damage accumulates over the lifetime of the ropes [19]. The correlation between the accelerated rope testing for synthetic ropes under controlled laboratory conditions (DMaC test rig) has been compared with real sea data [20].…”

Section: Limitationsmentioning

confidence: 99%

Underwater acoustic emission monitoring – Experimental investigations and acoustic signature recognition of synthetic mooring ropes

et al. 2017

Self Cite

View full text Add to dashboard Cite

Mooring ropes are essential components of offshore installations, and synthetic ropes are increasingly preferred because of their favourable cost to weight ratios. In-service condition of these materials is traditionally monitored through costly visual inspection, which adds to the operating costs of these structures. Acoustic Emissions (AE) are widely used for condition-monitoring in air, and show great potential underwater. This paper investigates the AE signatures of synthetic mooring ropes subjected to sinusoidal tension-tension loading in a controlled environment, using a large-scale dynamic tensile test rig. With a linear array of 3 broadband (20 Hz-50 kHz) hydrophones, four main signatures are identified: low-to high frequency, low-amplitude signals (50 Hz-10 kHz), lowamplitude broadband signals (10 kHz-20 kHz), high amplitude signals (10 Hz-48 kHz) and mediumamplitude signals (500 Hz-48 kHz). These AE types are related to different stages of rope behaviour, from bedding-in to degradation and failure. The main findings are that the failure location and breaking load can be identified through the detection of AE. The occurrence of high amplitude AE bursts in relation to the applied tensile load allows the detection of an imminent failure, i.e. prior to the failure event. These initial results indicate that AE analyses can enable the integrity of synthetic mooring ropes to be monitored.

show abstract

Accelerated reliability testing of articulated cable bend restrictor for offshore wind applications

Cited by 12 publications

References 18 publications

Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

A Framework and Baseline for the Integration of a Sustainable Circular Economy in Offshore Wind

Underwater acoustic emission monitoring – Experimental investigations and acoustic signature recognition of synthetic mooring ropes

Contact Info

Product

Resources

About