Hull Surface Pressure Measurement of the Affix-Type Multipoint Pressure Sensor Using Fiber Bragg Gratings

Fukushima, Hiroshi; Wakahara, Masahito; Kanai, Takeshi

doi:10.1007/978-981-15-4624-2_22

Cited by 4 publications

(3 citation statements)

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“…Recently, a new type of pressure sensor using Fiber Bragg Gratings (FBGs) was developed to measure the pressure on the entire ship hull surface [14,15], and studies have been conducted to investigate its practical applications [16,17]. The FBG pressure sensor has three primary features.…”

Section: Introductionmentioning

confidence: 99%

“…The integration of the added pressure on the wetted hull surface becomes the added resistance. The hull-surface pressure around energysaving devices has also been investigated [17], and the wave loads have been calculated from the measured pressure distributions without using a segmented model [24]. Based on these new results, the use of FBG pressure sensors to obtain the pressure distribution is being established as an innovative experimental method.…”

Section: Introductionmentioning

confidence: 99%

“…Fig 17. Averages and standard deviations for the calibration coefficients C f obtained for RBC-CW ( +0.5• C ≤ T ≤ +6.0 • C , N =12) …”

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confidence: 99%

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Temperature interference in improved FBG pressure sensor for towing tank test

et al. 2023

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Because of EEDI regulations for ships and SDGs, it is of vital importance to develop ships with good propulsion performance, not only in still water, but also in waves. To predict the propulsion and seakeeping performance in waves, and in particular ship motions and added resistance, various theoretical calculation methods and CFD codes have been developed. To validate these estimation methods, experimental data on details of the flow induced by the ship disturbance are required. To meet this demand, the authors developed an innovative method for measuring and analyzing the spatial pressure distribution over the ship-hull surface using a large number of Fiber Bragg Grating (FBG) pressure sensors. However, pressure measurements with the conventional FBG pressure sensors are largely influenced by the difference in the temperature between water and air, referred to as the temperature interference. To resolve this issue, the authors developed a new FBG pressure sensor that incorporates three improvements and is significantly less influenced by temperature interference. Its performance was confirmed through comparisons with measured pressures obtained using existing strain-type and conventional FBG pressure sensors. Furthermore, the effects of different materials used for manufacturing ship models on the pressure measurement were investigated experimentally in towing tank tests. Finally, an experimental study was conducted to determine which of the three improvements in the latest FBG pressure sensor is essential for reducing the temperature interference.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature interference in improved FBG pressure sensor for towing tank test

et al. 2023

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An innovative EFD using FBG pressure sensors for ship seakeeping

Suzuki,

Iwashita,

Kashiwagi

et al. 2024

J Mar Sci Technol

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This paper examines the acquisition of the measurement data of the spatial distribution of unsteady pressure on a ship advancing in waves. The purpose of the study is to investigate the reliability of the pressure data obtained by the unprecedented experiment and to provide experimental data of unsteady pressure which can be used for validation of arbitrary computation methods. The optical fiber sensing technology, so-called FBG (fiber Bragg gratings) sensing, is employed as the pressure sensors. In the experiment, 379 FBG pressure sensors (version 7; the latest version) in total are attached to the port side surface of ship model and also ordinary strain-type pressure sensors are embedded in the starboard side for validating reliability of FBG pressure sensors by comparing both results. In addition to the pressure distribution, measurement is made for unsteady hydrodynamic forces such as added mass, damping coefficients, and wave exciting forces, and also for ship motions and added resistance. Most of the measurement is repeated at least five times for each condition, and results of measured pressures are evaluated with mean value and standard deviation. Regarding the added resistance, the distribution for estimating added resistance is also extracted from obtained pressure distribution and its pressure contour is illustrated to show visually which hull region affects the added resistance significantly. Validation of the measured pressure with FBG pressure sensors is carried out also by integrating measured pressures over the ship model surface and comparing it with forces directly measured with load cells. The measured pressure distribution is compared with typical calculation results with the Rankine panel method in frequency domain to demonstrate usefulness of the spatial pressure data for validating the calculation method. Through these studies, it is confirmed that the measured unsteady pressures with FBG pressure sensors are accurate enough and valuable as the validation data for any calculation method.

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