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Relevant bibliographies by topics / Quasi-rigid domains

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Academic literature on the topic 'Quasi-rigid domains'

Author: Grafiati

Published: 14 March 2023

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Journal articles on the topic "Quasi-rigid domains"

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Aleksiev, T., R. Potestio, F. Pontiggia, S. Cozzini, and C. Micheletti. "PiSQRD: a web server for decomposing proteins into quasi-rigid dynamical domains." Bioinformatics 25, no. 20 (2009): 2743–44. http://dx.doi.org/10.1093/bioinformatics/btp512.

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Beckebanze, F., C. Brouzet, I. N. Sibgatullin, and L. R. M. Maas. "Damping of quasi-two-dimensional internal wave attractors by rigid-wall friction." Journal of Fluid Mechanics 841 (February 26, 2018): 614–35. http://dx.doi.org/10.1017/jfm.2018.107.

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The reflection of internal gravity waves at sloping boundaries leads to focusing or defocusing. In closed domains, focusing typically dominates and projects the wave energy onto ‘wave attractors’. For small-amplitude internal waves, the projection of energy onto higher wavenumbers by geometric focusing can be balanced by viscous dissipation at high wavenumbers. Contrary to what was previously suggested, viscous dissipation in interior shear layers may not be sufficient to explain the experiments on wave attractors in the classical quasi-two-dimensional trapezoidal laboratory set-ups. Applying

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Polles, Guido, Giuliana Indelicato, Raffaello Potestio, Paolo Cermelli, Reidun Twarock, and Cristian Micheletti. "Mechanical and Assembly Units of Viral Capsids Identified via Quasi-Rigid Domain Decomposition." PLoS Computational Biology 9, no. 11 (2013): e1003331. http://dx.doi.org/10.1371/journal.pcbi.1003331.

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Xu, L. M., S. Zeng, N. Guo, R. M. Lin, and D. Du. "Design and analysis of a passive damping device in a head actuator assembly." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 216, no. 3 (2002): 353–66. http://dx.doi.org/10.1243/0954406021525061.

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It is known that a quasi-rigid-body mode (QR mode) exists in hard disk drives (HDDs) in the frequency range from 3 to 5 kHz and that it is caused by the flexibility of the pivot and the mass and structure of the head actuator assembly (HAA). This mode hinders performance improvement of the servo system in this bandwidth and thus limits the area density growth of HDDs. In this paper, a novel tuned damping device is proposed to suppress the QR mode and to reduce the residual vibration in head positioning in order to improve the servo system performance. The damping device is to be installed on t

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Beirão da Veiga, L., C. Canuto, R. H. Nochetto, and G. Vacca. "Equilibrium analysis of an immersed rigid leaflet by the virtual element method." Mathematical Models and Methods in Applied Sciences 31, no. 07 (2021): 1323–72. http://dx.doi.org/10.1142/s0218202521500275.

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We study, both theoretically and numerically, the equilibrium of a hinged rigid leaflet with an attached rotational spring, immersed in a stationary incompressible fluid within a rigid channel. Through a careful investigation of the properties of the domain functional describing the angular momentum exerted by the fluid on the leaflet (which depends on both the leaflet angular position and its thickness), we identify sufficient conditions on the spring stiffness function for the existence (and uniqueness) of equilibrium positions. This study resorts to techniques from shape differential calcul

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Früh, W. G., and A. H. Nielsen. "On the origin of time-dependent behaviour in a barotropically unstable shear layer." Nonlinear Processes in Geophysics 10, no. 3 (2003): 289–302. http://dx.doi.org/10.5194/npg-10-289-2003.

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Abstract. An experimental study on the instability of a detached Stewartson layer, using an annular, rotating tank with flat, rigid upper and lower boundaries, showed an instability to steady vortices at a critical Reynolds number, arranged in a global mode structure along the shear layer. Increasing the Reynolds number resulted in successive transitions to lower modes where time-dependent behaviour was only found for flows with three or less vortices. Previous numerical simulations of a related experiment, using a two-dimensional spectral model of the quasi-geostrophic vorticity equation inco

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Kusanovic, Danilo S., Elnaz Seylabi, and Domniki Asimaki. "Optimization of frequency domain impedances for time-domain response analyses of building structures with rigid shallow foundations." Earthquake Spectra 37, no. 3 (2021): 1955–79. http://dx.doi.org/10.1177/8755293020981994.

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The effects of dynamic soil–structure interaction (SSI) have been extensively studied in the last few decades, and proper analysis for the linear elastic case in frequency domain has been established successfully. However, SSI is rarely considered in the design of building structures, and instead, buildings are frequently analyzed using a rigid base assumption and quasi-static loading conditions that ignore SSI and its dynamic nature. Acknowledging these shortcomings, the National Institute of Standards and Technology (NIST) published in 2012 a set of recommendations on time-domain analyses of

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Ragone, Francesco, and Gualtiero Badin. "A study of surface semi-geostrophic turbulence: freely decaying dynamics." Journal of Fluid Mechanics 792 (March 4, 2016): 740–74. http://dx.doi.org/10.1017/jfm.2016.116.

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In this study we give a characterization of semi-geostrophic turbulence by performing freely decaying simulations for the case of constant uniform potential vorticity, a set of equations known as the surface semi-geostrophic approximation. The equations are formulated as conservation laws for potential temperature and potential vorticity, with a nonlinear Monge–Ampère type inversion equation for the streamfunction, expressed in a transformed coordinate system that follows the geostrophic flow. We perform model studies of turbulent surface semi-geostrophic flows in a domain doubly periodic in t

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Mancini, Simone, Koen Boorsma, Marco Caboni, et al. "Characterization of the unsteady aerodynamic response of a floating offshore wind turbine to surge motion." Wind Energy Science 5, no. 4 (2020): 1713–30. http://dx.doi.org/10.5194/wes-5-1713-2020.

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Abstract. The disruptive potential of floating wind turbines has attracted the interest of both the industry and the scientific community. Lacking a rigid foundation, such machines are subject to large displacements whose impact on aerodynamic performance is not yet fully explored. In this work, the unsteady aerodynamic response to harmonic-surge motion of a scaled version of the DTU 10 MW turbine is investigated in detail. The imposed displacements have been chosen representative of typical platform motion. The results of different numerical models are validated against high-fidelity wind tun

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Chen, Zhaohui, Yi Sun, Haiyong Zhang, and Zhaohui Zhang. "A Study on the Fluctuating Pressure Correlation of a Cantilevered Elliptic Annular Roof Structure." International Journal of Structural Stability and Dynamics 16, no. 01 (2016): 1640013. http://dx.doi.org/10.1142/s0219455416400137.

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A wind tunnel test on a large-span cantilevered elliptical annular roof was carried out. The time series of wind pressures were tested simultaneously on the upper and lower surfaces of a roof structure rigid model, that was exposed to open and suburban boundary layer air flows in various wind directions. The spatial correlation characteristics of fluctuating pressures on the roof structure were analyzed. Both the analyzing results of the correlation coefficient in time domain and the coherence function in frequency domain indicated that the correlation structure of the fluctuating pressure of

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Conference papers on the topic "Quasi-rigid domains"

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Cavallaro, Paul V., Michael P. Smith, Jacob D. O’Donnell, Allison Redington, and Eric Warner. "Soft Artificial Muscle Actuators for Undersea Launch and Recovery Systems." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-93951.

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Abstract The pursuit of increased autonomy for undersea and surface vehicles presents challenges for their launch, recovery, positioning and control (LRP&C). Traditional rigid handling and actuator systems are often volume constrained and can limit payloads capacities and operational effectiveness. The need to innovate high capacity and compact actuation technologies is intensified by increasing demands for rapid deployability and stowability, scalability, adaptability, temporary buoyancy and connectivity across the undersea and surface domains. On-demand inflatable and compactable soft ac

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Nava, Vincenzo, and Felice Arena. "Effects of Second-Order Extreme Waves on the Dynamics of a Non-Linear Floating Body." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-84077.

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Nowadays technical and scientific communities are increasingly interested in the development of technologies for floating devices which can serve different purposes both in coastal and offshore environment. Thus, strong effort is required in the development of correct and efficient algorithms for studying the behavior of such structures under the action of sea wave loadings. At this purpose, in the past few years several approaches were investigated, both in frequency and in time domains, using linear and non-linear structural models and linear and non-linear wave theories. In this note, the e

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Xu, LiMei, Sheng Zeng, NingQun Guo, and Rongming Lin. "Passive Vibration Control of the Head Actuator Assembly in Hard Disk Drive." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21572.

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Abstract It is known that a quasi-rigid body mode exists in hard disk drives in the frequency range from 3 to 6 kHz and it is caused by the flexibility of the pivot, the mass and structure of the head actuator assembly. The mode hinders performance improvement of servo system in bandwidth. In this paper, a tuned damping device is proposed to suppress this mode. The damping device is to be installed on the arm and hollow space within the voice coil motor on the HDDs. The dynamic characteristics of the head actuator assembly with the tuned damping device are measured in both frequency domain and

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Ormberg, Harald, Elizabeth Passano, and Neil Luxcey. "Global Analysis of a Floating Wind Turbine Using an Aero-Hydro-Elastic Model: Part 1—Code Development and Case Study." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50114.

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This paper describes the extension of a well proven state-of-the-art simulation tool for coupled floating structures to accommodate offshore wind turbine applications, both floating and fixed. All structural parts, i.e. rotor blades, hub, nacelle, tower, vessel and mooring system, are included in the finite element model of the complete system. The aerodynamic formulation is based on the blade element momentum theory. A control algorithm is used for regulation of blade pitch angle and electrical torque. The system response is calculated by nonlinear time domain analysis. This approach ensures

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Ludvigsen, Arild, Zhi Yuan Pan, Peng Gou, and Torgeir Vada. "Adapting a Linear Potential Theory Solver for the Outer Hull to Account for Fluid Dynamics in Tanks." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10284.

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The linear boundary value problem for the wave dynamics inside a tank is very similar to the solution for the outer hull. Because of this, the boundary value solver for the outer hull can be re-used for the tank. The oscillating hydrostatic pressure in the tank may also be calculated in the same way as for the outer hull. Thereby, the hydrostatic coefficients from the tank can also be obtained from the outer solution. This makes it, in principle, easy to adapt outer solution computer code to also account for the inner solutions for all the tanks. The procedure is discussed by Newman (2005). We

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Islam, A. B. M. Saiful, Mohammed Jameel, Suhail Ahmad, and Mohd Zamin Jumaat. "Nonlinear Response of Coupled Integrated Spar Platform Under Severe Sea States." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83862.

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The oil and gas industry has moved towards the offshore deep water regions due to depletion of these resources in shallow and intermediate water depths. Conventional fixed jacket type platforms and bottom supported compliant platforms have been found to be inefficient and uneconomical for exploring these resources in deep water regions. In view of deep water conditions, Spar platforms have been seen to be the most economical and suitable alternative offshore platforms. Several operational Spar platforms such as SB-1, Shell’s ESSCO, Brent Spar, Oryx Neptune Spar, Chevron Genesis Spar and Exxon’

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Kvittem, Marit I., Petter Andreas Berthelsen, Lene Eliassen, and Maxime Thys. "Calibration of Hydrodynamic Coefficients for a Semi-Submersible 10 MW Wind Turbine." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77826.

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Hydrodynamic model tests and numerical simulations may be combined in a complementary manner during the design and qualification of new offshore structures. In the EU H2020 project LIFES50+ (lifes50plus.eu), a model test campaign of floating offshore wind turbines using Real-Time Hybrid Model (ReaTHM) testing techniques was carried out at SINTEF Ocean in fall 2017. The present paper focuses on the process of calibrating a numerical model to the experimental results. The concepts tested in the experimental campaign was a 1:36 scale model of the public version of the 10MW OO-Star Wind Floater se

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Zhang, Chi, Harrif Santo, Minbo Cai, and Allan Magee. "Dynamic Response of a Generic Self-Elevating Unit in Operation With Hull in Water." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78850.

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Abstract Self-elevating units (SEUs), with a water-tight hull fitted with long support legs and spudcans, are widely used in offshore drilling and operations, as well as offshore wind turbine installations. SEUs are also known as jack-up rigs. A jack-up rig undergoes several stages of operations involving different leg configurations, such as legs retracted, legs suspended in the water, spudcans pre-loaded into the soil, and legs deployed in the seabed with the hull lifted clear above water. The hull and the legs will therefore be subjected to various external environmental actions. Transit op

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