Bibliographies thématiques / Load and structure nonlinearities

Littérature scientifique sur le sujet « Load and structure nonlinearities »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Load and structure nonlinearities"

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Kim, A. Yu, S. V. Polnikov et M. F. Amoyan. « Features of Accounting for Geometric and Physical Nonlinearities in Long-Span Pneumatic Membrane Systems ». Herald of Dagestan State Technical University. Technical Sciences 49, no 4 (9 février 2023) : 152–61. http://dx.doi.org/10.21822/2073-6185-2022-49-4-152-161.

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Objective. The purpose of the study is to substantiate the need to take into account the geometric and physical nonlinearities in large-span membrane-pneumatic systems.Method. The study is based on the application of the parameter variation method; method of successive loadings; the iterative method of parameter increments using the third Euler-Cauchy numerical procedure or the Runge-Kutta method of a higher order of accuracy.Result. It has been established that the geometric non-linearity can be from 5 to 10% if the structure has a small or medium span, and the load on the structure is not very large, especially when it comes to section load. If the span of the structure is 120150 meters, and the load and deflections are large enough, then the geometric nonlinearity can be 20% or more. It was revealed that the physical nonlinearity, which we took into account by the standard Euler-Cauchy procedure of the third order of accuracy, with a large span of the structure and a large load is approximately 13-21%, and the part of the physical nonlinearity of the air pumped between the hermetic membranes of the structure is determined using an improved formula Euler-Cauchy with the number of iterations 20-25, i.e. "aftereffect", according to the results of the study, ranges from 2-7%.Conclusion. A structure consisting of light metal structures can be erected within a few months on a finished pile or strip foundation. Such structures can easily withstand many types of dynamic loads, namely wind, seismic, vibration, and are one-third cheaper than buildings made from traditional materials.
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Neville, Robin M., Rainer M. J. Groh, Alberto Pirrera et Mark Schenk. « Beyond the fold : experimentally traversing limit points in nonlinear structures ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 476, no 2233 (janvier 2020) : 20190576. http://dx.doi.org/10.1098/rspa.2019.0576.

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Recent years have seen a paradigm shift regarding the role of nonlinearities and elastic instabilities in engineering science and applied physics. Traditionally viewed as unwanted aberrations, when controlled to be reversible and well behaved, nonlinearity can enable novel functionalities, such as shape adaptation and energy harvesting. The analysis and design of novel structures that exploit nonlinearities and instabilities have, in part, been facilitated by advances in numerical continuation techniques. An experimental analogue of numerical continuation, on the other hand, has remained elusive. Traditional quasi-static experimental methods control the displacement or force at one or more load-introduction points over the test specimen. This approach fails at limit points in the control parameter, as the immediate equilibrium beyond limit points is statically unstable, causing the structure to snap to a different equilibrium. Here, we propose a quasi-static experimental path-following method that can continue along stable and unstable equilibria, and traverse limit points. In addition to controlling the displacement at the main load-introduction point, the technique relies on overall shape control of the structure using additional actuators and sensors. The proposed experimental method enables extended testing of the emerging class of structures that exploit nonlinearities and instabilities for novel functionality.
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Klockiewicz, Zbyszko, Mikołaj Spadło et Grzegorz Ślaski. « The influence of suspension nonlinearities on fatigue assessment of vehicle structure ». IOP Conference Series : Materials Science and Engineering 1199, no 1 (1 novembre 2021) : 012074. http://dx.doi.org/10.1088/1757-899x/1199/1/012074.

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Abstract Load spectrums for the fatigue analysis were created using suspension responses generated in a simulation of vehicle and suspension vertical dynamics nonlinear model for different conditions of vehicle use. The next stage presented was the use of finite element method and analysis of obtained stresses with its transformation to a set of cycles that are used in the determination of fatigue characteristics. The qualitative and quantitative analysis of the stresses field in the vehicle structure and suspension elements was done and later the influence of suspension responses on the fatigue assessment for most loaded parts of suspension and vehicle structure. Lastly conclusions were drawn from the results describing qualitative and quantitative influence of different road class and load conditions on fatigue assessment of vehicle structure and suspension components. Conclusion on the proposed and used methodology also was drawn.
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Ramazani, Mohammad Reza, Philip Sewell, Siamak Noroozi, Mehran Koohgilani et Bob Cripps. « Sensor Optimisation for in-Service Load Measurement of a Large Composite Panel under Small Displacement ». Applied Mechanics and Materials 248 (décembre 2012) : 153–61. http://dx.doi.org/10.4028/www.scientific.net/amm.248.153.

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Current methods to estimate the behaviour of composite structures are based on trial and error or oversimplification. Normally the nonlinearities in these structures are neglected and in order to cover this inadequacy in design of composite structures, an overestimate safety factor is used. These methods are often conservative and leading to the heavier structures. A novel technique employs Artificial Neural Network (ANN) as an inverse problem approach to estimate the pressure loads experienced by marine structures applied on a composite marine panel from the strain measurements. This can be used in real-time to provide an accurate load history for a marine structure without requiring knowledge of the material properties or component geometry. It is proposed that the ANN methodology, with further research and development, could be utilised for the quantification of in-service, transient loads in real-time acting on the craft from the craft’s structural response (strain response to load). However, to fully evaluate this methodology for load monitoring of marine structures further research and development is required such as sensor optimisation. The number of sensors should be minimised to reduce the time to train the system, cost and weight. This study investigates the number of sensors required for accurate load estimation by optimising the method.
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Pieńko, Michał. « The analysis of the deformation of single node in a modular scaffolding system ». Budownictwo i Architektura 13, no 2 (11 juin 2014) : 349–56. http://dx.doi.org/10.35784/bud-arch.1914.

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The increasingly complex engineering structures of scaffoldings require optimal designing in terms of safety, economy and erection. This approach requires detailed knowledge of the static-strength properties of elements, as well as knowledge of their interconnections. The paper deals with the laboratory tests of deformations in modular scaffolding nodes for the following loads: torque of the ledger, shearing and bending in the horizontal plane. The original grip was used in the study, which allows to load the node with aforementioned loads. The result of research is a description of the deformation of the nodes and the load-displacement graphs. The studies presented in the paper indicate that graphs are repeatable, which is not obvious in the case of nodes assembled manually. This means that it can be used as a basis for the verification of non-linear numerical analysis, which will have to take into account such issues as the material nonlinearities, geometric nonlinearities, contact and friction.
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Mo, O., et T. Moan. « Environmental Load Effect Analysis of Guyed Towers ». Journal of Energy Resources Technology 107, no 1 (1 mars 1985) : 24–33. http://dx.doi.org/10.1115/1.3231158.

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A general method for dynamic load effect analysis of slender offshore structures subjected to short crested random waves, current and wind, is given. The structure is represented by a three-dimensional space frame model utilizing dash-pots and linear or nonlinear spring elements to represent guy lines and coupling between structure and foundation. The component mode synthesis formulation is adopted for reduction of the number of degrees of freedom. The hydrodynamic forces are computed by Morison’s equation, accounting for finite wave elevation, directionality, and relative fluid-structure motion. Various kinematic models for the fluid field in the splashing zone are compared. To get a reasonable representation of nonlinearities in the loading and the structural model, a Monte Carlo approach is adopted. Starting with simulated samples of the random fluid field and wind forces, time series of structural responses are found by numerical time integration utilizing the Newmark β-family of time integration operators. Numerical results for a guyed tower at 450-m water depth are presented. The statistical uncertainties associated with the stochastic time domain simulations are discussed. A significant discrepancy is found between linearized frequency domain solutions and the present nonlinear time domain formulation. The importance of an adequate representation of superharmonic responses is particularly discussed. The differences in results due to various solution methods are found to vary significantly with sea-state conditions.
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Mukhlas, Nurul 'Azizah, Noor Irza Mohd Zaki, Mohd Khairi Abu Husain et Gholamhossein Najafian. « Comparison of Extreme Surface Elevation for Linear and Nonlinear Random Wave Theory for Offshore Structures ». MATEC Web of Conferences 203 (2018) : 01021. http://dx.doi.org/10.1051/matecconf/201820301021.

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For offshore structural design, the load due to wind-generated random waves is usually the most important source of loading. While these structures can be designed by exposing them to extreme regular waves (100-year design wave), it is much more satisfactory to use a probabilistic approach to account for the inherent randomness of the wave loading. This method allows the statistical properties of the loads and structural responses to be determined, which is essential for the risk-based assessment of these structures. It has been recognized that the simplest wave generation is by using linear random wave theory. However, there is some limitation on its application as some of the nonlinearities cannot be explained when higher order terms are excluded and lead to underestimating of 100-year wave height. In this paper, the contribution of nonlinearities based on the second order wave theory was considered and being tested at a variety of sea state condition from low, moderate to high. Hence, it was proven that the contribution of nonlinearities gives significant impact the prediction of 100-year wave's design as it provides a higher prediction compared to linear wave theory.
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Padovan, J., R. Moscarello, J. Stafford et F. Tabaddor. « Pantographing Self-Adaptive Gap Elements ». Tire Science and Technology 13, no 3 (1 juillet 1985) : 154–82. http://dx.doi.org/10.2346/1.2150993.

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Abstract A pantographing self-adaptive gap element type contact strategy is presented. Due to the manner of its formulation, it can handle large deformations in the contact zone, contact initiation in a structure that has either positive or indefinite stiffness characteristics, kinematic and material nonlinearities, as well as self-adaptive load (time) stepping. Contact in pre- and post-buckling structures can be treated in this context. Several illustrative benchmark problems are given. These include coming into contact with a fiat surface, and involve large deformation kinematics and inelastic behavior as well as pre- and post-buckling stiffness characteristics.
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Zhang, Xiaotian, Ruiqing Wang, Xiaogang Li, Chengyang Lu, Zhengkang Wang et Wenlong Wang. « Dynamics Modeling and Characterization of Sunk Screw Connection Structure in Small Rockets ». Aerospace 9, no 11 (25 octobre 2022) : 648. http://dx.doi.org/10.3390/aerospace9110648.

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Bolted flange joints are widely used in engineering structures. Sunk screw connection structures commonly used in small rockets and missiles exhibit significant nonlinear characteristics when subjected to forces. In this article, a study of the dynamic characteristics of sunk screw connection is conducted. A 3-dof trilinear dynamic model is proposed, based on the study of the stiffness characteristics of the connection structure and considering contact nonlinearities. The connection surface is simplified as two axial trilinear springs and a lateral linear spring. The motion of the system can be divided into nine regions by the turning point of the trilinear springs. So that the motion of the system in each region can be completely resolved, the dynamic characteristics of the 3-dof trilinear system under impulse load and simple harmonic load are studied by means of semi-numerical analytical method. It is found that the response frequency of the system remains unchanged under a small impulse load, and the response can be obtained by approximate analytical expressions. When the impulse load is large, the response frequency is fluctuant, which reflects the sensitivity of the nonlinear system to the magnitude of impulse load. Under the simple harmonic excitation of bending moment, the response frequency curve of the system presents good single peak characteristics when the excitation amplitude is small. When the amplitude is large, the peak frequency of the system shifts, and the phenomenon of multi-peak resonance is shown in a certain range.
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An, Chao, Chao Yang, Changchuan Xie et Yang Meng. « Gust Load Alleviation including Geometric Nonlinearities Based on Dynamic Linearization of Structural ROM ». International Journal of Aerospace Engineering 2019 (12 mai 2019) : 1–20. http://dx.doi.org/10.1155/2019/3207912.

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This paper describes a framework for an active control technique applied to gust load alleviation (GLA) of a flexible wing, including geometric nonlinearities. Nonlinear structure reduced order model (ROM) and nonplanar double-lattice method (DLM) are used for structural and aerodynamic modeling. The structural modeling method presented herein describes stiffness nonlinearities in polynomial formulation. Nonlinear stiffness can be derived by stepwise regression. Inertia terms are constant with linear approximation. Boundary conditions and kernel functions in the nonplanar DLM are determined by structural deformation to reflect a nonlinear effect. However, the governing equation is still linear. A state-space equation is established in a dynamic linearized system around the prescribed static equilibrium state after nonlinear static aeroelastic analysis. Gust response analysis can be conducted subsequently. For GLA analysis, a classic proportional-integral-derivative (PID) controller treats a servo as an actuator and acceleration as the feedback signal. Moreover, a wind tunnel test has been completed and the effectiveness of the control technology is validated. A remote-controlled (RC) model servo is chosen in the wind tunnel test. Numerical simulation results of gust response analysis reach agreement with test results. Furthermore, the control system gives GLA efficacy of vertical acceleration and root bending moment with the reduction rate being over 20%. The method described in this paper is suitable for gust response analysis and control strategy design for large flexible wings.
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Thèses sur le sujet "Load and structure nonlinearities"

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Guo, Jianping. « Sliding Mode Based Load Frequency Control for an Interconnected Power System with Nonlinearities ». Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1435857616.

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Archontakis, Theofanis. « Essays on term structure modeling : estimation, nonlinearities and immunization / ». [S.l. : s.n.], 2007. http://www.gbv.de/dms/zbw/558853412.pdf.

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Kumar, Avishek. « Multivariable control of wind turbines for fatigue load reduction in the presence of nonlinearities ». Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/17839.

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In an effort to reduce cost of energy from wind, wind turbines have grown to immense sizes. This has led to large, flexible, lightly damped towers and rotors that can be excited by the wind. Reducing the resulting fatigue loading and maintaining power capture are primary objectives for advanced controllers. In this thesis, a synthesis procedure for creating a multivariable linear parameter varying (LPV) controller suitable for the wind turbine control problem is created. The LPV controller uses the current wind speed estimate from an Extended Kalman Filter (EKF) for gain scheduling in order to accommodate system nonlinearities. The synthesis procedure allows the use of a parameter dependance Lyapunov function without having to choose the form of the parameter dependence. Additionally, the synthesis procedure is designed for discrete time systems, allowing digital implementation of the controller. While the LPV controller is suitable for the wind turbine problem, its performance is limited by constrained actuators, as well as persistent disturbances to the system. Therefore a model predictive controller (MPC controller) that builds on the advantages of the LPV controller is created. The MPC controller utilises future wind speed information to increase controller performance and can maintain stability in the presence of constrained actuators. The ability of both controllers to reduce fatigue loading in the drivetrain, tower and blades whilst maintaining power capture relative to a baseline is tested in simulation. The testing includes six hours of simulations using a high order, nonlinear aeroelastic model of a three-bladed, 600kW wind turbine in full-field turbulent winds. The simulation conditions include above rated, below rated, and transitional winds. The LPV controller shows overall reductions in tower, drivetrain and blade loads relative to the baseline. The MPC controller shows poor performance in below rated winds due to high errors in the prediction model. In above rated winds, the MPC controller shows the ability to reduce loads in the blades, drivetrain and tower relative to the LPV controller. Furthermore, the MPC controller shows less pitch actuator usage and maintains performance in situations that cause the LPV controller to saturate the pitch actuators and lose performance.
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Terasima, Kentaro. « Studies on structure and optical nonlinearities of B_2O_3-Based glasses ». Kyoto University, 1997. http://hdl.handle.net/2433/202295.

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Kapila, Vikram. « Robust fixed-structure control of uncertain systems with input-ouput nonlinearities ». Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/12069.

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Hatipoglu, Cem. « Variable Structure Control of Continuous Time Systems Involving Non-Smooth Nonlinearities ». The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1391691862.

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Hatipo?lu, Cem. « Variable structure control of continuous time systems involving non-smooth nonlinearities / ». The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487950153600937.

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Bingham, Christopher Malcolm. « Application of variable structure control methods to actuator nonlinearities in aerospace systems ». Thesis, Cranfield University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358823.

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Choi, Hyeongrak. « Photonic crystal cavity with self-similar structure and single-photon Kerr nonlinearities ». Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108985.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 31-34).
We propose a design of photonic crystal cavity with self-similar electromagnetic boundary conditions, that achieve ultrasmall mode volume (Vff). The electric energy density of a cavity mode can be maximized in the air or dielectric region, depending on the choice of boundary conditions. We illustrate the design concept with a silicon-air ID photon crystal cavity that reaches an ultrasmall mode volume of Vff ~ 7.01 x 10- 5 [lambda]3 at [lambda] ~ 1550 nm. We show that the extreme light concentration in our design can enable ultra-strong Kerr nonlinearities, even at the single photon level. These features open new directions in cavity quantum electrodynamics, spectroscopy, and quantum nonlinear optics.
by Hyeongrak Choi.
S.M.
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Marathe, Anup Ramesh. « Buckling of dome structure with opening, under wind load ». To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Livres sur le sujet "Load and structure nonlinearities"

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Gaponov-Grekhov, A. V. Nonlinearities in action : Oscillations, chaos, order, fractals. Berlin : Springer-Verlag, 1992.

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Toulan, Omar N. Nonlinearities in the impact of industry structure : The case of concentration and intra-industry variability in rates of return. Cambridge, Mass : Alfred P. Sloan School of Management, Massachusetts Institute of Technology, 1995.

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Prediction of the collapse load for moment-resisting stell frame structure under earthquake forces. Kuala Lumpur : Penerbit USM Press, 2015.

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Reardon, Lawrence R. Evaluation of a strain-gage load calibration on a low-aspect-ratio wing structure at elevated temperature. [Washington, D.C.] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989.

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Reardon, Lawrence F. Evaluation of a strain-gage load calibration on a low-aspect-ratio wing structure at elevated temperature. Moffett Field, Calif : Ames Research Center, 1989.

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Reardon, Lawrence R. Evaluation of a strain-gage load calibration on a low-aspect-ratio wing structure at elevated temperature. [Washington, D.C.] : National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989.

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Lucas, R. G. Characterization of changes in commercial building structure, equipment, and occupants end-use load and consumer assessment program (ELCAP). Richland, WA : Pacific Northwest Laboratory, 1990.

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H, Acquaviva Thomas, et Lewis Research Center, dir. Static stability of the space station solar array FASTMast structure. Cleveland, Ohio : NASA Lewis Research Center, 1995.

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R, Farrar C., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering. et Los Alamos National Laboratory, dir. Static load cycle testing of a low-aspect-ratio six-inch wall, TRG-type structure, TRG-4-6 (1.0, 0.25). Washington, DC : Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1989.

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R, Farrar C., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering. et Los Alamos National Laboratory, dir. Static load cycle testing of a low-aspect-ratio six-inch wall, TRG-type structure, TRG-4-6 (1.0, 0.25). Washington, DC : Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1989.

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Chapitres de livres sur le sujet "Load and structure nonlinearities"

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Fahey, Paul F. « Distortion Product Responses of Saturating Nonlinearities ». Dans Cochlear Mechanisms : Structure, Function, and Models, 405–12. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5640-0_46.

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Dallos, P., et M. A. Cheatham. « Cochlear Nonlinearities Reflected in Inner Hair Cell Responses ». Dans Cochlear Mechanisms : Structure, Function, and Models, 197–204. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5640-0_24.

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Duifhuis, H. « Power-Law Nonlinearities : A Review of Some Less Familiar Properties ». Dans Cochlear Mechanisms : Structure, Function, and Models, 395–403. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5640-0_45.

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Cooper, S. B., S. Manzato, A. Borzacchiello, L. Bregant et B. Peeters. « Investigating Nonlinearities in a Demo Aircraft Structure Under Sine Excitation ». Dans Model Validation and Uncertainty Quantification, Volume 3, 41–57. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12075-7_5.

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Al-Farhan, Zaid F., Moataz A. Al-Obaydi et Qutayba N. Al-Saffar. « Tunnel-Soil-Structure Interaction Under Seismic Load ». Dans Geotechnical Engineering and Sustainable Construction, 91–102. Singapore : Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6277-5_8.

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Woo, Seong-woo. « Mechanical Structure Including Mechanisms and Load Analysis ». Dans Design of Mechanical Systems Based on Statistics, 117–58. First edition. | Boca Raton : CRC Press, 2021. | : CRC Press, 2021. http://dx.doi.org/10.1201/9780429022050-5.

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Savidis, S. A., et C. Bode. « Soil-structure interaction due to moving loads ». Dans Wave propagation Moving load – Vibration Reduction, 47–59. London : CRC Press, 2021. http://dx.doi.org/10.1201/9781003211372-6.

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Bai, Er-Wei. « Identification of Linear Systems with Hard Input Nonlinearities of Known Structure ». Dans Lecture Notes in Control and Information Sciences, 259–70. London : Springer London, 2010. http://dx.doi.org/10.1007/978-1-84996-513-2_16.

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Nagesh, Mahesh, Randall J. Allemang et Allyn W. Phillips. « Characterization of Nonlinearities in a Structure Using Nonlinear Modal Testing Methods ». Dans Nonlinear Structures & ; Systems, Volume 1, 167–78. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77135-5_19.

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Negahi Shirazi, Ali, Wojciech Chrzanowski, Ali Khademhosseini et Fariba Dehghani. « Anterior Cruciate Ligament : Structure, Injuries and Regenerative Treatments ». Dans Engineering Mineralized and Load Bearing Tissues, 161–86. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22345-2_10.

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Actes de conférences sur le sujet "Load and structure nonlinearities"

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De Breuker, Roeland, Mostafa Abdalla et Zafer Gürdal. « On the Effect of Geometric Nonlinearities on Static Load Alleviation ». Dans 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-2356.

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KITAGAWA, M., et K. KUBOMURA. « Transient load analysis method for large linear structures with local nonlinearities and its application to Space Shuttle payload load analysis ». Dans 26th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-734.

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« OPTIMAL DESIGN OF VARIABLE STRUCTURE LOAD FREQUENCY CONTROLLER WITH NONLINEARITIES USING TABU SEARCH ALGORITHM ». Dans First International Conference on Informatics in Control, Automation and Robotics. SciTePress - Science and and Technology Publications, 2004. http://dx.doi.org/10.5220/0001142000270032.

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An, Chao, Changchuan Xie, Yang Meng et Chao Yang. « Wind tunnel test and gust load alleviation of flexible wing including geometric nonlinearities with servo control ». Dans 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0192.

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Sathish Kumar, S. « Ultimate Limit State Analysis of Ship Structures ». Dans International Conference on Marine Engineering and Technology Oman. London : IMarEST, 2019. http://dx.doi.org/10.24868/icmet.oman.2019.011.

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Subjective and objective uncertainties are imposed on ship structures due to the random nature of the loading environment, inadequate knowledge of physical phenomena associated with loads or deviations in material properties which make reliable predictions of structural response a difficult task. Strength criteria for ships can be established by ultimate strength studies of progressive collapse analysis of finite element models under different boundary conditions with combined geometric and material nonlinearities. Load-Displacement and/or Moment-Curvature curves can be generated and the ultimate load causing failure identified as a multiple of the design load. Ultimate limit state analysis can be carried out for various combinations of parameters to identify the ultimate load factor in each case.
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Damiani, Rick R., Huimin Song, Amy N. Robertson et Jason M. Jonkman. « Assessing the Importance of Nonlinearities in the Development of a Substructure Model for the Wind Turbine CAE Tool FAST ». Dans ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11434.

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The design and analysis of wind turbines are performed using aero-servo-elastic tools that account for the nonlinear coupling between aerodynamics, controls, and structural response. The NREL-developed computer-aided engineering (CAE) tool FAST also resolves the hydrodynamics of fixed-bottom structures and floating platforms for offshore wind applications. Primarily due to the required modal characteristics, monopiles become progressively less economical and more difficult (or impossible) to fabricate for multimegawatt turbines and water depths of more than 25–30 m. Derived from the oil and gas industry experience, light and stiff space-frame alternatives have been proposed to alleviate this problem. Lattice structures (e.g., jackets) are more complex to analyze and design than cantilevered monopiles, especially in terms of the structural dynamics of the coupled turbine-support structure system. This paper outlines the implementation of a structural-dynamics module (SubDyn) for offshore wind turbines with space-frame substructures into the current FAST framework, and in particular focuses on the initial assessment of the importance of structural nonlinearities. Nonlinear effects include: large displacements, axial shortening due to bending, cross-sectional transverse shear effects, etc. A nonlinear computational analysis is resource-intensive, thus it is important to assess the applicability of a linear approach to maintain high-fidelity results while still allowing for fast and efficient design simulations. Space-frame structural behavior can be controlled by a number of design parameters (e.g., member cross-sectional properties, number of legs, batter angles). Additionally, nonlinearities may manifest only at certain load levels. Several finite-element analyses were carried out via commercial and open-source codes that can capture nonlinear effects in the structural behavior of turbine substructures under different load cases. Results were compared to the output of the new linear module SubDyn. The configurations considered in this study included 5-MW, 7-MW, and 10-MW platforms: OC3 monopile, OC3 tripod, OC4 jacket, and a full-lattice tower, all supporting a 5-MW turbine; also two jackets for a 7-MW and a 10-MW turbine, respectively, were investigated. These models differed in base geometry, load paths, size, supported towers, and turbine masses. Results showed that nonlinearities (quantified in terms of the maximum differences in displacement and stresses with respect to a linear calculation) amounted to about 4% (3%) at tower top (at tower base), or about 10 cm (1 cm). This means that the absolute effects of nonlinearities are mostly associated with the tower. The linear approach used by the multimember structural module introduced in this paper was therefore deemed suitable to be utilized within FAST to analyze multimember substructures for offshore wind applications.
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Hantz, Benjamin, Venkata M. K. Akula et John Leroux. « FFS Assessment of Pressurized Equipment Utilizing a Thickness Mapping Tool ». Dans ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63646.

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For pressure vessels, loss of thickness detected during scheduled maintenance utilizing UT scans can be assessed based on Level 1 or 2 analyses as per API 579 guidelines. However, Level 1 and 2 analyses can point to excessively conservative assessments. Level – 3 assessments utilizing the finite element method can be performed for a more accurate estimate of the load carrying capacity of the corroded structure. However, for a high fidelity structural response prediction using the finite element method, the characteristics of the model must be accurately represented. Although the three nonlinearities, namely, the geometric, material, and contact nonlinearities can be adequately included in a finite element analysis, procedures to accurately include the thickness measurements are not readily available. In this paper, a tool to map thicknesses obtained from UT scans onto a shell based finite element models, to perform Level – 3 analyses is discussed. The tool works in conjunction with Abaqus/CAE and is illustrated for two different structures following the elastic-plastic analysis procedure outlined in the API 579 document. The tool is intended only as a means to reduce the modeling time associated with mapping thicknesses. The results of the analyses and insights gained are presented.
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Hadidi-Moud, Saeid, et David J. Smith. « Use of Elastic Follow-Up in Integrity Assessment of Structures ». Dans ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61754.

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This paper reviews the concepts and definitions related to elastic follow-up, Z, together with its potential use in stress classification. Based on the principles governing benchmark multiple bar structures elastic follow-up (EFU) is quantified. Local nonlinearities arising within a structure influence elastic follow-up. These include variations in the geometry of structure, its material properties, effects of plasticity and creep, structural discontinuities and boundary conditions. Elastic follow-up is shown to be simple to evaluate, is physically meaningful (as it relates strain accumulation in the structure to its cause) and is useful in design practice. In this generalised definition Z = 1 indicates no follow-up and represents a fully displacement controlled situation. In contrast Z = ∞ represents the extreme case of fully load controlled situation. Presence of mixed boundary conditions is interpreted as 1 < Z < ∞. A methodology that overcomes the singularity problem of cracked structure to determine Z is then proposed. The distinctive characteristic of the proposed approach is that it takes account of situations where the structure contains defects.
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Marino, E., C. Lugni, L. Manuel, H. Nguyen et C. Borri. « Simulation of Nonlinear Waves on Offshore Wind Turbines and Associated Fatigue Load Assessment ». Dans ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24623.

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By using a global simulation framework that employs a domain-decomposition strategy for computational efficiency, this study investigates the effects of fully nonlinear (FNL) waves on the fatigue loads exerted on the support structure (monopile) of a fixed-bottom offshore wind turbine. A comparison is made with more conventional linear wave hydrodynamics. The FNL numerical wave solver is invoked only on specific sub-domains where nonlinearities are detected; thus, only locally in space and time, a linear wave solution is replaced by the FNL results as input to the Morison equation used for the hydrodynamic loads. The accuracy and efficiency of this strategy allows long timedomain simulations where strongly nonlinear free-surface phenomena, like imminent breaking waves, are accounted for in the prediction of structural loads. The unsteady nonlinear free-surface problem governing the propagation of gravity waves is formulated using potential theory and a higher-order boundary element method (HOBEM) is used to discretize Laplace’s equation. The FNL solver is employed and associated hydrodynamic loads are predicted in conjunction with aerodynamic loads on the rotor of a 5-MW wind turbine using the NREL open-source software, FAST. We assess fatigue loads by means of both time- and frequency-domain methods. This study shows that the use of linear theory-based hydrodynamics can lead to significant underestimation of fatigue loads and damage.
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Wang, Fa-Cheng, Hua-Yang Zhao et Lin-Hai Han. « Analytical behavior of concrete-filled aluminum tubular stub columns under axial compression ». Dans 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia : Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7135.

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This paper presents numerical investigation of circular concrete-filled aluminum tubular (CFAT) stub columns under axial compression. The numerical models were developed using the finite element (FE) package ABAQUS. The parameters commonly employed in conventional CFST FE modeling have been discussed in this study. The nonlinearities of concrete and aluminum materials and the interaction between concrete and aluminum tube were considered. Numerical models were validated against collected experimental data. The ultimate loads, load-axial strain relationship and failure modes from numerical simulations were compared with those from experiments. The verified FE model was used to analyze structural behavior of full histories of the corresponding load-deformation N-ε response. Load-deformation N-ε curves for both concrete and aluminum tube were also presented. Upon on validation of the FE models, additional structural performance data over a wide range of diameter-to-thickness ratios, aluminum grades and concrete strengths were generated for parametric studies. The influences of diameter-to-thickness ratios, aluminum grades and concrete strengths on the ultimate strength were presented in this paper.
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Rapports d'organisations sur le sujet "Load and structure nonlinearities"

1

Sharp, Jeremy A., Duncan B. Bryant et Gaurav Savant. Low-Sill Control Structure Gate Load Study. U.S. Army Engineer Research and Development Center, mai 2022. http://dx.doi.org/10.21079/11681/44340.

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The effort performed here describes the process to determine the gate lifting loads at the Low-Sill Control Structure. To measure the gate loads, a 1:55 Froude-scaled model of the Low-Sill Control Structure was tested. Load cells were placed on 3 of the 11 gates. Tests evaluated the gate loads for various hydraulic heads across the structure. A total of 109 tests were conducted for 14 flows with each flow having two gate settings provided by the United States Army Corps of Engineers, New Orleans District. The load data illustrated the potential for higher gate lifting loads (GLL) to occur at the mid-range gate opening (Go) for Gates 3 and 6. While for Gate 10, the highest GLL (452 kips, maximum load in testing) was at a Go = 4.2 ft. Conversely, for the low-flow bays, the highest load occurred at Go = 24.86 ft.
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McCoy, R. M. Load test of the 283W Clearwell Roof Deck and Support Structure. Office of Scientific and Technical Information (OSTI), septembre 1994. http://dx.doi.org/10.2172/10104065.

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McCoy, R. M. Load test of the 306E Building roof deck and support structure. Office of Scientific and Technical Information (OSTI), janvier 1995. http://dx.doi.org/10.2172/42467.

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McCoy, R. M. Load test of the 3790 Building Roof Deck and Support Structure. Office of Scientific and Technical Information (OSTI), septembre 1994. http://dx.doi.org/10.2172/10189818.

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McCoy, R. M. Load test of the 3701U Building roof deck and support structure. Office of Scientific and Technical Information (OSTI), septembre 1994. http://dx.doi.org/10.2172/10185190.

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McCoy, R. M. Load test of the 3701D Building roof deck and support structure. Office of Scientific and Technical Information (OSTI), septembre 1994. http://dx.doi.org/10.2172/10187669.

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McCoy, R. M. Load test of the 272W Building high bay roof deck and support structure. Office of Scientific and Technical Information (OSTI), septembre 1994. http://dx.doi.org/10.2172/10103748.

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McCoy, R. M. Load test of the 277W Building high bay roof deck and support structure. Office of Scientific and Technical Information (OSTI), décembre 1994. http://dx.doi.org/10.2172/10107282.

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Kennedy, R. P., R. H. Kincaid et S. A. Short. Engineering characterization of ground motion. Task II. Effects of ground motion characteristics on structural response considering localized structural nonlinearities and soil-structure interaction effects. Volume 2. Office of Scientific and Technical Information (OSTI), mars 1985. http://dx.doi.org/10.2172/5817815.

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Lucas, R. G., Z. T. Taylor, N. E. Miller et R. G. Pratt. Characterization of changes in commercial building structure, equipment, and occupants : End-Use Load and Consumer Assessment Program. Office of Scientific and Technical Information (OSTI), décembre 1990. http://dx.doi.org/10.2172/6266769.

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