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Dynamic responses of an FPSO moored on sloped seabed under the action of environmental loads
Roy, Shovan,Banik, Atul K. Techno-Press 2018 Ocean systems engineering Vol.8 No.3
The inclination of seabed profile (sloped seabed) is one of the known topographic features which can be observed at different seabed level in the large offshore basin. A mooring system connected between the platform and global seabed is an integral part of the floating structure which tries to keep the floating platform settled in its own position against hostile sea environment. This paper deals with an investigation of the motion responses of an FPSO platform moored on the sloped seabed under the combined action of wave, wind and current loads. A three-dimensional panel discretization method has been used to model the floating body. To introduce the connection of multi-segmented non-linear elastic catenary mooring cables with the sloped seabed, a quasi-static composite catenary model is employed. The model and analysis have been completed by using hydrodynamic diffraction code AQWA. Validation of the numerical model has been successfully carried out with an experimental work published in the latest literature. The analysis procedure in this study has been followed time domain analysis. The study involves an objective oriented investigation on platform motions, in order to identify the effects of the slopped seabed, the action of the wave, wind and current loads and the presence of riser system. In the end, an effective analysis has been performed to identify a stable mooring model in demand of reducing structural responses of the FPSO.
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Higher Degree Cubature Quadrature Kalman Filter
Abhinoy Kumar Singh,Shovan Bhaumik 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.5
In this paper, an algorithm has been developed to solve the nonlinear estimation problems. The intractable integrals, appeared during the estimation, have been approximately evaluated using any arbitrary but odd degree spherical cubature and higher order Gauss-Laguerre quadrature rule. The pro-posed method is termed as higher degree cubature quadrature Kalman filter (HDCQKF). With the help of two examples it has been shown that the accuracy of the proposed filter is higher compared to the cubature Kalman filter (CKF), the cubature quadrature Kalman filter (CQKF), and the higher degree cubature Kalman filter (HDCKF). The proposed method is a generalization of all existing cubature fil-ters and under certain simplifications it merges with them.
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Coupled dynamic responses of a semisubmersible under the irregular wave and turbulent wind
Dey, Swarnadip,Saha, Kaushik,Acharya, Pooja,Roy, Shovan,Banik, Atul K. Techno-Press 2018 Ocean systems engineering Vol.8 No.4
A coupled dynamic analysis of a semisubmersible-type FOWT has been carried out in time domain under the combined action of irregular wave and turbulent wind represented respectively by JONSWAP spectrum and Kaimal spectrum. To account for the turbine-floater motion coupling in a more realistic way, the wind turbulence has been incorporated into the calculation of aerodynamic loads. The platform model was referred from the DeepCwind project and the turbine considered here was the NREL 5MW Baseline. To account for the operationality of the turbine, two different environmental conditions (operational and survival) have been considered and the aerodynamic effect of turbine-rotation on actual responses of the FOWT has been studied. Higher mean offsets in surge and pitch responses were obtained under the operational condition as compared to the survival condition. The mooring line tensions were also observed to be sensitive to the rotation of turbine due to the turbulence of wind and overestimated responses were found when the constant wind was considered in the analysis. Additionally, a special analysis case of sudden shutdown of the turbine has also been considered to study the swift modification of responses and tension in the mooring cables.
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Evaluation of the FLEXotendon glove‑III through a human subject case study
Phillip Tran,Drew Elliott,Kinsey Herrin,Shovan Bhatia,Jaydev P. Desai 대한의용생체공학회 2023 Biomedical Engineering Letters (BMEL) Vol.13 No.2
Cervical spinal cord injury (SCI) can significantly impair an individual’s hand functionality due to the disruption of nervesignals from the brain to the upper extremity. Robotic assistive hand exoskeletons have been proposed as a potential technologyto facilitate improved patient rehabilitation outcomes, but few exoskeleton studies utilize standardized hand functiontests and questionnaires to produce quantitative data regarding exoskeleton performance. This work presents the humansubject case study evaluation of the FLEXotendon Glove-III, a 5 degree-of-freedom voice-controlled, tendon-driven softrobotic assistive hand exoskeleton for individuals with SCI. The exoskeleton system was evaluated in a case study with twoindividuals with SCI through two standardized hand function tests namely, the Jebsen-Taylor Hand Function Test and theToronto Rehabilitation Institute Hand Function Test and three questionnaires (Capabilities of Upper Extremities Questionnaire,Orthotics Prosthetics Users Survey, Quebec User Evaluation of Satisfaction with Assistive Technology). Minor designchanges were made to the exoskeleton: integrated fingertip force sensors to sense excessive grasp force, a quick connectsystem to expedite the exoskeleton glove swapping process between users, compact tendon tension sensors to measure tendonforce for admittance control, and a redesigned smartphone app to encompass all aspects of exoskeleton use.
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Khan Mohammad Khan,Ragesh Kumar,Hemant Krishna,Nirmalya Ghosh,Shovan Kumar Majumder 대한의용생체공학회 2016 Biomedical Engineering Letters (BMEL) Vol.6 No.4
Purpose To report development of a depth-sensitivefluorescence spectroscopy system based on the configurationof point collection fixed at the centre of an illumination ringon the surface of a target sample. Methods The system makes use of an axicon for convertingthe collimated laser beam into ring shaped illumination andachieves the ability of subsurface interrogation by varyingthe radii of the illumination rings thereby introducing spatialoffsets between collection and illumination. The system wasvalidated on a non-biological phantom comprising a thin tissuepaper overlaying a thick dye card and also on a biologicaltissue sample that was a chicken leg tissue consisting of athin epithelial membrane on the top of a much thicker muscletissue. Results It was found that while the fluorescence spectracorresponding to zero spatial offset are dominated by thefluorescence emission bands associated with the top layer ofthe layered samples, the fluorescence spectra measured withspatial offsets contain higher contribution of fluorescencesignatures characteristics of the bottom layer as compared tothe spectrum measured with the zero offset. Conclusions The SOFS based system is able to interrogatesubsurface depths beyond the reach of the conventionalconfocal fluorescence by simply varying the position ofthe axicon in the excitation arm. Due to the simplicity inits instrumentation, the approach has the potential to bedeveloped into a portable system for in situ measurement ina tissue.
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