Seafloor Stability Monitoring by Displacements Calculated from Acceleration Waveforms Obtained by a 3-Component Servo-Accelerometer System

Saito, Hideki; Yokoyama, Tetsuji; Uchiyama, Shigekazu

doi:10.1109/oceans.2006.307058

Cited by 7 publications

(4 citation statements)

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“…The position of a mobile robot was determined from the double integration of the acceleration signals [8]. The seafloor stability was monitored by displacements obtained from accelerometers [9]. In earthquake monitoring, accelerometers are widely used and various signal processing techniques have been studied [10][11][12].…”

Section: Double Integration Of Acceleration Signalsmentioning

confidence: 99%

Methods of measuring the vibrations of a gun tube under impulse loads

Choi

Yoo

Cha³

et al. 2011

J Mech Sci Technol

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In many respects, accelerometers are convenient for measuring the lateral vibrations of a gun tube under impulse loads. Reliable measurements by accelerometers must overcome two issues: exceedingly large acceleration at high frequencies due to stress waves, and the elimination of drifts accumulating through the integration of acceleration signals. In this paper, we use a mechanical filter that reduces the effect of stress waves. Also, we propose a new double integration algorithm based on multi-resolution wavelet decomposition. Using a test-rig, we measure the vibration characteristics of commercially-available damping materials. Based on the test results, we design a mechanical filter and experimentally verify the performance of the filter. The proposed double integration algorithm is shown to be as effective as other existing algorithms without arbitrary selection of parameters.

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Section: Double Integration Of Acceleration Signalsmentioning

confidence: 99%

Methods of measuring the vibrations of a gun tube under impulse loads

Choi

Yoo

Cha³

et al. 2011

J Mech Sci Technol

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“…In the limited number of field NGH production tests, the seafloor stability during methane production was closely monitored. Series of marine geophysical equipment based on seafloor environment monitor systems were developed, including the 3-component servo-accelerometer system and the tiltmeters and pressure sensors based on seafloor deformation monitoring system developed by Japan [28,29], the Gas Hydrate Sea-Floor Observatory developed by the USA [30], the three-dimensional environmental monitoring system and "four-in-one" environmental monitoring system developed by China [31,32]. The advantages of quick response, high-efficiency, and reflecting the real situation of sediment deformation accompanied by NGH production are obvious by these systems.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Interaction Effects between Reservoir Deformation and Hydrate Dissociation in Hydrate-Bearing Sediment by Depressurization Method

Wang

et al. 2021

Energies

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Natural gas hydrate (NGH) has been widely focused on having great potential for alternative energy. Numerous studies on gas production from hydrate-bearing sediments have been conducted in both laboratory and field. Since the strength of hydrate-bearing sediments depends on the saturation of NGH, the decomposition of NGH may cause the failure of sediments, then leading to reservoir deformation and other geological hazards. Plenty of research has shown that the reservoir deformation caused by hydrate decomposition is considerable. In order to investigate this, the influence of sediment deformation on the production of NGH, a fully coupled thermo-hydro-chemo-mechanical (THMC) model is established in this study. The interaction effects between reservoir deformation and hydrate dissociation are discussed by comparing the simulation results of the mechanical coupling and uncoupled models on the laboratory scale. Results show that obvious differences in behaviors between gas and water production are observed among these two models. Compared to the mechanical uncoupled model, the mechanical coupling model shows a significant compaction process when given a load equal to the initial pore pressure, which leads to a remarkable decrease of effective porosity and reservoir permeability, then delays the pore pressure drop rate and reduces the maximum gas production rate. It takes a longer time for gas production in the mechanical coupling model. Since the reservoir temperature is impacted by the comprehensive effects of the heat transfer from the boundary and the heat consumption of hydrate decomposition, the reduced maximum gas production rate and extended gas production process for the mechanical coupling model lead to the minimum reservoir temperature in the mechanical coupling model larger than that of the mechanical uncoupled model. The reduction of the effective porosity for the mechanical coupling model causes a larger cumulative water production. The results of this paper indicate that the reservoir deformation in the gas production process should be taken into account by laboratory and numerical methods to accurately predict the behaviors of gas production on the field scale.

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Section: Introductionmentioning

confidence: 99%

“…Domestic and foreign scholars have used side-scan sonar, pressure sensor, acceleration sensor, and other equipment to monitor submarine landslides [13][14][15]. Saito et al [15,16] used acceleration sensors to monitor the sliding velocity of the seabed and calculated the sliding displacement of the seabed. Fabian M et al [17,18] used a triaxial acceleration sensor and an inclinometer to monitor the lateral deformation of the seafloor, while Stenvold and Wallace et al [19,20] used a high-precision manometer to monitor the seafloor pressure, thereby obtaining the seafloor subsidence deformation.…”

Section: Introductionmentioning

confidence: 99%

Research on Submarine landslide monitoring and early warning system

Xue

Liang

et al. 2021

E3S Web Conf.

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Monitoring and early warning of submarine landslides could provide instant predictions for landslides, which is to avoid the destructive damage of submarine facilities such as pipelines and optical cable, etc effectively. However, researches on submarine landslide focus on numerical simulation and laboratory test, lacking support of in-situ observation data. This paper established the submarine landslide monitoring and early warning system by combining real-time monitoring data with web network platform and database technique. Based on the computational analysis of key monitoring parameters in the process of seabed deformation and sliding, the system has realized the accurate prediction and early warning of submarine landslides. The system has been applied to the submarine landslide monitoring in Zhoushan sea area, Zhejiang province, China, which has ensured the safety of offshore platforms and submarine projects in this area. The establishment of this system provides a new idea and method for submarine landslide warning.

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Seafloor Stability Monitoring by Displacements Calculated from Acceleration Waveforms Obtained by a 3-Component Servo-Accelerometer System

Cited by 7 publications

References 0 publications

Methods of measuring the vibrations of a gun tube under impulse loads

Methods of measuring the vibrations of a gun tube under impulse loads

Investigating the Interaction Effects between Reservoir Deformation and Hydrate Dissociation in Hydrate-Bearing Sediment by Depressurization Method

Research on Submarine landslide monitoring and early warning system

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