On the feasibility of a real time stability assessment for fishing vessels

Caamaño, Lucía Santiago; González, Marcos Míguez; Casás, Vicente Díaz

doi:10.1016/j.oceaneng.2018.04.002

Cited by 17 publications

(10 citation statements)

References 9 publications

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“…Considering the previous characteristics, the current proposal differs in two main points from the previous work carried in (Míguez González et al, 2017;Santiago Caamaño et al, 2018b). On the one hand, this work was based on the sequential application of FFT to estimate the roll natural frequency and directly from this value the stability of the vessel.…”

Section: Condition Monitoring System Designmentioning

confidence: 89%

“…This approach was further developed to reduce the uncertainty of the obtained results by implementing a sequential application of the FFT, which together with an averaging, smoothing and fitting process of the obtained roll spectra increases the estimation performance. Results of GM estimations for two similar stern trawlers using the latter implementation, both considering roll motion from a mathematical model (Míguez González et al, 2017) and from real sea trials (Santiago Caamaño et al, 2018b), were in the range of [-10 %, +20 %] to the target value of GM . Although these results were reasonable, it was concluded that further research was needed to enhance the reliability of the proposed system.…”

Section: Literature Surveymentioning

confidence: 99%

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Real-time detection of transverse stability changes in fishing vessels

et al. 2019

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Fishing is a hazardous activity due to stability related accidents, caused many times by the crew lacking information related to the level of stability of the vessel. A possible solution is offered by stability assessment systems that can help the skipper to identify potential risks and support his decision making process.The metacentric height is a key parameter for vessel stability and its real-time monitoring may be beneficial for alerting the crew about changes in stability. The paper proposes the design of a novel stability monitoring system that automatically detects changes in metacentric height based on estimates of the roll natural frequency solely using the measured roll angle. The core of the monitoring system is a combined estimation-detection system that exploits methods in advanced signal processing and statistical change detection to properly address issues of robustness.

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Section: Condition Monitoring System Designmentioning

confidence: 89%

Section: Literature Surveymentioning

confidence: 99%

Real-time detection of transverse stability changes in fishing vessels

et al. 2019

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“…A key component for such a system is a monitoring and detection system, to give an early warning. Such early warning systems have already been developed for ships [51][52][53][54][55][56][57], enabling the crew to take corrective measures such as speed and/or course changes to avoid the occurrence of parametric roll. However, to date, no such early warning system has been developed for a WEC.…”

Section: Suppression Control Methods For Parametric Resonance In Wecsmentioning

confidence: 99%

A Real-Time Detection System for the Onset of Parametric Resonance in Wave Energy Converters

Davidson

Kalmár‐Nagy

2020

JMSE

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Parametric resonance is a dynamic instability due to the internal transfer of energy between degrees of freedom. Parametric resonance is known to cause large unstable pitch and/or roll motions in floating bodies, and has been observed in wave energy converters (WECs). The occurrence of parametric resonance can be highly detrimental to the performance of a WEC, since the energy in the primary mode of motion is parasitically transferred into other modes, reducing the available energy for conversion. In addition, the large unstable oscillations produce increased loading on the WEC structure and mooring system, accelerating fatigue and damage to the system. To remedy the negative effects of parametric resonance on WECs, control systems can be designed to mitigate the onset of parametric resonance. A key element of such a control system is a real-time detection system, which can provide an early warning of the likely occurrence of parametric resonance, enabling the control system sufficient time to respond and take action to avert the impending exponential increase in oscillation amplitude. This paper presents the first application of a real-time detection system for the onset of parametric resonance in WECs. The method is based on periodically assessing the stability of a mathematical model for the WEC dynamics, whose parameters are adapted online, via a recursive least squares algorithm, based on online measurements of the WEC motion. The performance of the detection system is demonstrated through a case study, considering a generic cylinder type spar-buoy, a representative of a heaving point absorber WEC, in both monochromatic and polychromatic sea states. The detection system achieved 95% accuracy across nearly 7000 sea states, producing 0.4% false negatives and 4.6% false positives. For the monochromatic waves more than 99% of the detections occurred while the pitch amplitude was less than 1/6 of its maximum amplitude, whereas for the polychromatic waves 63% of the detections occurred while the pitch amplitude was less than 1/6 of its maximum amplitude and 91% while it was less than 1/3 of its maximum amplitude.

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“…Terada et al [26] proposed the methodology to calculate metacentric height (GM) using roll-period data. Santiago et al [27] estimated the stability of fishing vessels based on the analysis of roll motion and the mass moment of inertia. The stability monitoring system estimated the GM of fishing vessels using the measured roll angle [28].…”

Section: Introductionmentioning

confidence: 99%

A Methodology for Simply Evaluating the Safety of a Passenger Ship Stability Using the Index for the Intact Stability Appraisal Module

Woo

2022

Sensors

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To evaluate the safety of passenger ships’ stability, ten stability parameters should be calculated. However, since the process for calculating all stability parameters is complex without a ship loading program, a convenient methodology to simply calculate them and evaluate the safety condition of a passenger ship is required to alert the hazard to a captain, officer, and crew. The Index for Passenger Ship Intact Stability Appraisal Module (IPSAM) is proposed herein. According to the value of a passenger ship’s metacentric height (GM) which could be calculated by the ship’s roll period measured by sensors in real-time, IPSAM simply calculates nine intact stability parameters except for AnglemaxGZ and proposes the present stability status as a Single Intact Stability Index (SISI). It helps crews easily recognize the safety of passenger ships’ stability as a decision support system in real-time. Based on the intact stability parameters of 331 loading conditions of 11 passenger ships, empirical formulas for IPSAM were derived. To verify the empirical formulas of IPSAM, the stability parameters of a passenger ship in 20 loading conditions were calculated using proposed empirical formulas and the principal calculation methods respectively, then compared. Additionally, the result of the SISI of 20 loading conditions successfully indicates the danger as the value of the SISI under 1.0 of the three loading conditions that do not satisfy the IMO intact stability requirements.

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On the feasibility of a real time stability assessment for fishing vessels

Cited by 17 publications

References 9 publications

Real-time detection of transverse stability changes in fishing vessels

Real-time detection of transverse stability changes in fishing vessels

A Real-Time Detection System for the Onset of Parametric Resonance in Wave Energy Converters

A Methodology for Simply Evaluating the Safety of a Passenger Ship Stability Using the Index for the Intact Stability Appraisal Module

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