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Journal articles on the topic 'Non conservative loads'

Author: Grafiati

Published: 21 July 2023

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1

Luongo, A., and F. D'Annibale. "Double zero bifurcation of non-linear viscoelastic beams under conservative and non-conservative loads." International Journal of Non-Linear Mechanics 55 (October 2013): 128–39. http://dx.doi.org/10.1016/j.ijnonlinmec.2013.05.007.

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2

Glabisz, W. "Stability of non-prismatic rods subjected to non-conservative loads." Computers & Structures 46, no. 3 (1993): 479–86. http://dx.doi.org/10.1016/0045-7949(93)90217-2.

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3

Kim, Min-Geun, Bonyong Koo, You-Sung Han, and Minho Yoon. "Asymmetric Design Sensitivity and Isogeometric Shape Optimization Subject to Deformation-Dependent Loads." Symmetry 13, no. 12 (2021): 2373. http://dx.doi.org/10.3390/sym13122373.

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We present a design sensitivity analysis and isogeometric shape optimization with path-dependent loads belonging to non-conservative loads under the assumption of elastic bodies. Path-dependent loads are sometimes expressed as the follower forces, and these loads have characteristics that depend not only on the design area of the structure but also on the deformation. When such a deformation-dependent load is considered, an asymmetric load stiffness matrix (tangential operator) in the response region appears. In this paper, the load stiffness matrix is derived by linearizing the non-linear non

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4

Adela Mejia-Nava, Rosa, Ismar Imamovic, Emina Hajdo, and Adnan Ibrahimbegovic. "Nonlinear instability problem for geometrically exact beam under conservative and non-conservative loads." Engineering Structures 265 (August 2022): 114446. http://dx.doi.org/10.1016/j.engstruct.2022.114446.

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5

Sasaki, M., and S. Chonan. "Vibration and stability of elasticity supported circular plates under conservative and non-conservative loads." Journal of Sound and Vibration 103, no. 1 (1985): 99–108. http://dx.doi.org/10.1016/0022-460x(85)90249-4.

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6

Guo, X. X. "Vibration Characteristics of the Non-Conservative Thermoelastic Coupling Plate." Applied Mechanics and Materials 66-68 (July 2011): 551–56. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.551.

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The vibration characteristics of the thermoelastic coupling rectangular plate under the action of uniformly distributed tangential follower force are investigated. The coupled thermoelastic differential equation of the plate under the action of uniformly distributed tangential follower force was derived. Dimensionless complex frequencies of the thermoelastic coupling rectangular plate with one edge clamped and other three edges simply supported, two opposite edges simply supported and other two edges clamped were calculated by the differential quadrature method. The effects of the dimensionles

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7

Chonan, S., and M. Sasaki. "Vibration and stability of elastically supported multi-span beams under conservative and non-conservative loads." Journal of Sound and Vibration 99, no. 4 (1985): 545–56. http://dx.doi.org/10.1016/0022-460x(85)90539-5.

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8

Radin, V. P., V. P. Chirkov, E. V. Poznyak, and O. V. Novikova. "Stability of a rod with the elastic joint exposed to distributed non-conservative load." Proceedings of Higher Educational Institutions. Маchine Building, no. 5 (758) (May 2023): 3–13. http://dx.doi.org/10.18698/0536-1044-2023-5-3-13.

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Numerous features of non-conservative mechanical systems identified in studying their stability determine significant theoretical and practical interest to analyze various options of the calculation schemes. The paper considers stability of a rectilinear rod connected at one end to a joint and loaded with follower and potential loads uniformly distributed along the rod length. The joint was rigid with respect to rotation of the rod end. In order to apply the method of expanding solution to the perturbed motion equation into a series in terms of eigenmodes, the problem of determining the system

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9

Mpimpas, H., P. Anagnostopoulos, and J. Ganoulis. "Uncertainty of model parameters in stream pollution using fuzzy arithmetic." Journal of Hydroinformatics 10, no. 3 (2008): 189–200. http://dx.doi.org/10.2166/hydro.2008.037.

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Fuzzy arithmetic is employed for the analysis of uncertainties in water-stream pollution, when the various model parameters involved are imprecise. The one-dimensional advection–dispersion equation, for both a conservative and a non-conservative substance, was solved analytically for point and Gaussian-hill input loads of pollution, considering the dispersion and decay coefficients involved as fuzzy numbers. The solution of the advection–dispersion equation was also conducted numerically for the same input loads with the finite-difference method, employing a Lagrangian–Eulerian scheme. The goo

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10

Oliveira, D. C., R. B. Gomes, and G. S. Melo. "Punching shear in reinforced concrete flat slabs with hole adjacent to the column and moment transfer." Revista IBRACON de Estruturas e Materiais 7, no. 3 (2014): 414–67. http://dx.doi.org/10.1590/s1983-41952014000300006.

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The structural behavior and the ultimate punching shear resistance of internal reinforced concrete flat slab-column connections, with one hole adjacent to the column, with or without flexural moment transfer of the slab to the column was investigated. Main variables were: the existence whether or not hole, flexural reinforcement layout and ratio, the direction and sense of the moment transferred and the eccentricity of the load (M (moment transferred to column) / V (shear)) ratio at the connection - 0,50 m or 0,25 m. Seven internal slab-column joining were tested and ultimate loads, cracking,

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11

Shukla, Sunil, H. S. Deshmukh, Patil Vinaay, and B. A. Thite A. "Evaluation of Gun Support Structure Using Equivalent Dynamic Approach in Non Linear FEA." Applied Mechanics and Materials 376 (August 2013): 331–35. http://dx.doi.org/10.4028/www.scientific.net/amm.376.331.

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Robot Gun structure is an efficient way in which multiple welds can be done simultaneously. However mounting several weld guns on a single structure induces a variety of dynamic loads, especially during movement of the robot arm as it maneuvers to reach the weld locations.The primary idea employed in this paper, is to model those dynamic loads as equivalent G force loads in FEA. This approach will be on the conservative side, and will be saving time and subsequently cost efficient. The approach of the paper is towards creating a standard operating procedure (SOP) when it comes to analysis of s

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12

Paredes, Helmo K. Morales, Matheus Branco Arcadepani, Alexandre Candido Moreira, Flávio A. Serrão Gonçalves, and Fernando Pinhabel Marafão. "Enlightening Load Modeling by Means of Power Factor Decompositions." Energies 16, no. 10 (2023): 4089. http://dx.doi.org/10.3390/en16104089.

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Considering the proliferation of power electronics applications and distributed energy resources, modern power grids are facing a significant increase in harmonic currents circulation and supply voltage deterioration, occasionally associated with small frequency variations. In such a context, the understanding of power phenomena in circuits with linear and non-linear loads under non-sinusoidal voltage conditions is nontrivial and still does not allow for an easy interpretation of harmonic sources, harmonic power flow or the identification of the parameters of a proper equivalent circuit. The m

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13

Moriarty, Patrick J., William E. Holley, and Sandy Butterfield. "Effect of Turbulence Variation on Extreme Loads Prediction for Wind Turbines." Journal of Solar Energy Engineering 124, no. 4 (2002): 387–95. http://dx.doi.org/10.1115/1.1510137.

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The effect of varying turbulence levels on long-term loads extrapolation techniques was examined using a joint probability density function of both mean wind speed and turbulence level for loads calculations. The turbulence level has a dramatic effect on the statistics of moment maxima extracted from aeroelastic simulations. Maxima from simulations at lower turbulence levels are more deterministic and become dominated by the stochastic component as turbulence level increases. Short-term probability distributions were calculated using four different moment-based fitting methods. Several hundred

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14

Cai, Fu Hai, Xin Wang, and Fu Ling Zhao. "A New Fatigue Life Calculation Method Based on Non-Linear Cumulative Damage Theory." Applied Mechanics and Materials 423-426 (September 2013): 2116–22. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.2116.

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Operating characteristics of small and medium tonnage lattice boom crane which withstand fatigue loads was analyzed in this paper. It showed that the lattice boom crane utilization level is in the overlap zone of low cycle fatigue and high cycle fatigue. There may be some plastic deformation in the structure. So the total damage calculated by the Palmgren-Miner rule had a large scatter. Typical operating conditions was analyzed that K-type welded joints of the boom is under axial load and in-plane bending loads. Several critical areas of K-type welded joints were determined by ANSYS finite ele

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15

Qingzhen, Lu, Yin Yuanchao, Yang Zhixun, Chen Jinlong, Yan Jun, and Yue Qianjin. "Fatigue Life Prediction of Umbilicals Considering Non-Linear Stress." Polish Maritime Research 24, s2 (2017): 154–63. http://dx.doi.org/10.1515/pomr-2017-0078.

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Abstract The fatigue problem induced by wave loads and floater movements of dynamic umbilicals in deepwater is studied. The prediction method of the fatigue life is investigated by considering no-linear local stress due to contact and friction between components of the umbilical. A case study of a dynamic umbilical for 1500 meters depth in South China Sea was presented. The results showed that the more accurate result of the fatigue life was calculated by considering non-linear local stress. The fatigue life by considering local stress with the no-slip assumption was conservative. An obviously

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16

Agapov, Vladimir P., and Kurban R. Aidemirov. "Designing of the blades of aircraft propellers by the finite element method, taking into account the strength of structure." RUDN Journal of Engineering Researches 22, no. 1 (2021): 65–71. http://dx.doi.org/10.22363/2312-8143-2021-22-1-65-71.

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The blades of contemporary turboprop engines have a complex spatial configuration. They can be classified as shells. Methods for the shells calculation are well known. A number of computer programs have been created on their basis. However, these programs do not take into account the peculiarities associated with the mutual influence of deformations of the blade and the aerodynamic and inertial loads acting on it. The aim of this work is to develop a method of finite element calculation of aircraft propeller blades taking into account aeroelastic effects and to create a computer program on its

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17

Altman, Wolf, and Luiz Bevilacqua. "Nonconservative Components of Follower Forces in the Classical Shell Theory." Applied Mechanics Reviews 42, no. 11S (1989): S13—S19. http://dx.doi.org/10.1115/1.3152383.

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An analysis of follower forces acting on shell structures is presented. Attention is focussed on the expressions of such forces as functions of the generalized displacements. Specific expressions for the follower forces are obtained, according to the order of magnitude of the strains and angles of rotation. For small strains the follower forces allow a decomposition into conservative and non-conservative components. This leads to the equations of dynamic stability of shell problems subjected to follower loads. The dynamic counterparts of Donnell-Mushtari-Vlasov stability equations are presente

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18

van Kuik, G. A. M., D. Micallef, I. Herraez, A. H. van Zuijlen, and D. Ragni. "The role of conservative forces in rotor aerodynamics." Journal of Fluid Mechanics 750 (June 9, 2014): 284–315. http://dx.doi.org/10.1017/jfm.2014.256.

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AbstractThe theory to predict the performance and loads on rotors (propellers, screws, windmills) has a history of more than a century. Apart from modern computational fluid dynamics and vortex panel models taking the true blade geometry into account, most other models proceed from an infinitely thin actuator disc or line. These models assume an externally defined force field distributed at the disc or line, representing the loads on the real rotor. Given this force field, the flow is solved by momentum balances or by the equations of motion. The use of external force fields was discussed in t

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19

Fleury, Mateus Porto, Lucas Deroide do Nascimento, Clever Aparecido Valentin, Jefferson Lins da Silva, and Marta Pereira da Luz. "Creep Behaviour of Recycled Poly(ethylene) Terephthalate Non-Woven Geotextiles." Polymers 13, no. 5 (2021): 752. http://dx.doi.org/10.3390/polym13050752.

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At the beginning of this century, due to well-established Brazilian recycling processes, geosynthetics’ manufacturers started to use recycled poly(ethylene) terephthalate (PET) yarns/filaments (from PET bottles) in geotextile production. Despite the fact that recycled products cannot act as reinforcement functions, geosynthetics are constantly under sustained tensile load and experiences evolutions of the axial strain (creep behaviour). Thus, this study aims to assess the influence of the structure of (needle-punched) non-woven geotextiles manufactured using recycled PET yarns on their creep b

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20

Dietrich, M., K. Kędzior, A. Wittek, and T. Zagrajek. "Non-Linear Finite Element Analysis of Formation and Treatment of Intervertebral Disc Herniae." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 206, no. 4 (1992): 225–31. http://dx.doi.org/10.1243/pime_proc_1992_206_294_02.

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A biomechanical model of the spine motion segment L2/L3 consisting of the truncated vertebrae, endplates, intervertebral disc and pieces of anterior and posterior longitudinal ligaments has been used for a computer simulation study. A non-linear finite element analysis has shown that small loads compressing the spine, not greater than those occurring in everyday life, cause loss of stability of an intervertebral disc, resulting in lateral dislocation of its nucleus pulposus. This could be a potential cause of discopathy. The model indicates that conservative therapy of herniated disc by the tr

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21

Ciavarella, M., G. Macina, and G. P. Demelio. "On stress concentration on nearly flat contacts." Journal of Strain Analysis for Engineering Design 37, no. 6 (2002): 493–501. http://dx.doi.org/10.1243/030932402320950116.

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Fretting fatigue can severely damage components subjected to oscillatory tangential loads, leading to a dramatic reduction in fatigue life and causing catastrophic ruptures. A conservative approach that can be used when considering the effect of stress concentration induced by fretting is to ensure that the peak stress is smaller than the fatigue limit of the material. However, this depends on details of the geometry as well as loading conditions. In the present work, the contact problem of a flat rounded punch in contact with a half-plane is considered, where a dovetail joint contact geometry

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22

Manuel, Lance, Paul S. Veers, and Steven R. Winterstein. "Parametric Models for Estimating Wind Turbine Fatigue Loads for Design." Journal of Solar Energy Engineering 123, no. 4 (2001): 346–55. http://dx.doi.org/10.1115/1.1409555.

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International standards for wind turbine certification depend on finding long-term fatigue load distributions that are conservative with respect to the state of knowledge for a given system. Statistical models of loads for fatigue application are described and demonstrated using flap and edge blade-bending data from a commercial turbine in complex terrain. Distributions of rainflow-counted range data for each ten-minute segment are characterized by parameters related to their first three statistical moments (mean, coefficient of variation, and skewness). Quadratic Weibull distribution function

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23

Aida, Tadayoshi. "Basic Equations of Dynamic Elastic Stability for Thin-Walled Structural Members Subjected to Follower Loads and Their Application to Non-Conservative Torque Problems." Transactions of the Canadian Society for Mechanical Engineering 9, no. 2 (1985): 75–83. http://dx.doi.org/10.1139/tcsme-1985-0011.

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The basic equations and the boundary conditions, in which the effect of an initial torsional moment Mz0 is included, and needed for the analysis of the dynamic elastic stability of thin-walled structural members subjected to follower loads are derived by introducing the concept of initial stress and using the principle of virtual work. The stability problems of columns with a channel section subjected to a non-conservative torque are investigated in terms of numerical examples.

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24

Niu, Congmin, and Huajiang Ouyang. "Nonlinear Dynamic Analysis of Lifting Mechanism of an Electric Overhead Crane during Emergency Braking." Applied Sciences 10, no. 23 (2020): 8334. http://dx.doi.org/10.3390/app10238334.

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Mechanical brakes are essential for electric cranes when emergency braking occurs. This paper presents, for the first-time, a dynamic response analysis of emergency braking events of electrical cranes that has modelled crane components as flexible and rigid bodies. Based on the Hamilton principle, a nonlinear and non-smooth dynamic model is derived from a modified Lagrangian function and the virtual work of non-conservative forces. The dynamic responses of a 32-ton overhead travelling crane during the emergency braking process of its lifting mechanism with two service brakes determined by simu

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25

Radin, V. P., V. P. Chirkov, A. V. Shchugorev, and V. N. Shchugorev. "OFF-CENTER COMPRESSION OF THE ROD BY POTENTIAL AND NONCONSERVATIVE FORCES." Spravochnik. Inzhenernyi zhurnal, no. 275 (2020): 9–16. http://dx.doi.org/10.14489/hb.2020.02.pp.009-016.

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The paper studies the stability of the rectilinear form of equilibrium with the construction of the boundaries of the stability region for a rod with uniformly distributed mass. The stability of the cantilever rod is considered for the off-center application of potential and tracking forces. In case of non-conservative loads, when it is possible to lose the stability of the equilibrium position, a dynamic method of research is used. it is shown that the influence of the eccentric application of loads does not affect the location of the flutter boundary, but in contrast to the classical problem

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26

Zhao, Yong Xiang, Bing Yang, and Ming Fei Feng. "Determination of the Probabilistic Fatigue S-N Curves Including Super-Long Life Regime for a Railway Axle Steel." Advanced Materials Research 44-46 (June 2008): 57–64. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.57.

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The structures of railway vehicles are required to service in super-long life regime. Determination of the probabilistic S-N curves including the regime should be a basic work to realize the real fatigue life prediction and reliability assessment. Based on the test results of Chinese railway LZ50 axle carbon steel, a statistical extrapolating method is proposed to determine the curves by applying the conventional test data in mid-long life regime. Some phenomena, i.e. the response of “fatigue limit”, a great of heat affecting using the high frequency ultrasonic fatigue test system, and the non

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Zuluaga-Ramírez, Pablo, Malte Frövel, Álvaro Arconada, Tomás Belenguer, and Félix Salazar. "Evaluation of the Fatigue Linear Damage Accumulation Rule for Aeronautical CFRP Using Artificial Neural Networks." Advanced Materials Research 1016 (August 2014): 8–13. http://dx.doi.org/10.4028/www.scientific.net/amr.1016.8.

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New optimized aerospace structures use composite materials for critical components and subsystems which make essential the knowledge of their fatigue properties. In the present work, the conventional methodology based on linear damage accumulation rules, applied to determine the fatigue life of structures subjected to spectral loads was evaluated for an aeronautical Carbon Fiber Reinforced Epoxy composite material. A test program has been performed to obtain the classical S-N curves at different stress ratios. Constant life diagrams, CLDs, where determined by means of Artificial Neural Network

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Datta, P. K., and P. J. Deolasi. "Dynamic Instability Characteristics of Plates Subjected to Partially Distributed Follower Edge Loading with Damping." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 5 (1996): 445–52. http://dx.doi.org/10.1243/pime_proc_1996_210_218_02.

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The dynamic instability characteristics of rectangular plates with at least one free edge and subjected to non-conservative follower loading at the free edge has been studied by using the finite element formulation. The loading is distributed partially at the centre of the free edge. The modal transformation is applied to the resulting equilibrium equation for subsequent analysis. Structural damping is introduced into the system in terms of equivalent viscous damping. The effects of load bandwidth, plate aspect ratio, direction control parameter, damping, etc., on the stability behaviour of th

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Istiono, Heri, and Azhar Yusuf Ramadhan. "Analisis Pengaruh P-Delta Effect Terhadap Perbedaan Ketinggian Struktur Gedung Tahan Gempa (Studi Kasus : Non-Highrise Building)." Rekayasa Sipil 14, no. 3 (2020): 218–26. http://dx.doi.org/10.21776/ub.rekayasasipil.2020.014.03.8.

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The need for earthquake resistant buildings in Indonesia is something that needs to be considered. Considering that Indonesia is an earthquake prone area. A building structure must be designed to be able to withstand lateral loads such as earthquakes within the limits set by the code/standards. For conservative reasons analysis of the P-Delta Effect needs to be considered because the building development ratio will always increase every time. according to SNI 1726-2019 the P-Delta effect is only required for the design of tall buildings. In this case, the P-Delta effect will be calculated in t

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Radin, V. P., V. P. Chirkov, A. V. Shchugorev, and V. N. Shchugorev. "Methods for Determinning Critical Values of Nonconservative Loads in Problems of Stability of Mechanical Systems." Proceedings of Higher Educational Institutions. Маchine Building, no. 10 (715) (October 2019): 3–13. http://dx.doi.org/10.18698/0536-1044-2019-10-3-13.

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Methods for determining critical values of nonconservative loads in stability problems of mechanical systems with distributed parameters are considered in this work. Based on a dynamic approach to stability problems, the method of direct integration of the linearized equation of perturbed motion is proposed, and the problem of determining critical loads is reduced to the problem of minimizing a complex function of several variables. As a second method, the method of decomposition of the solution of the equation of perturbed motion in the forms of natural oscillations is presented. The fundamen

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31

Cantagallo, Cristina, Marco Terrenzi, Enrico Spacone, and Guido Camata. "Effects of Multi-Directional Seismic Input on Non-Linear Static Analysis of Existing Reinforced Concrete Structures." Buildings 13, no. 7 (2023): 1656. http://dx.doi.org/10.3390/buildings13071656.

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Recent studies have shown the importance of including the seismic input directionality in nonlinear analyses for an accurate prediction of the structural demand on frame structures. This paper proposes a new method that includes the multi-directionality of the input seismic forces in Nonlinear Static Analyses (NSAs). Conventionally, the pushover (PO) analyses apply monotonically increasing lateral loads in two directions that typically correspond with the building X and Y directions, that in the case of a rectangular plan are parallel to the building sides. Since in general the direction of th

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An, Qi, Hua Zhao, Peihai Li, and Maohai Fu. "Fatigue strength analysis of bogie frames under random loads." Advances in Mechanical Engineering 11, no. 9 (2019): 168781401987801. http://dx.doi.org/10.1177/1687814019878018.

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In this study, a method for analyzing the fatigue strength of a bogie frame under a random load was proposed. Based on the geometric features, a welded joint coordinate system was established to compute the stress components of each node in this coordinate system. With the influence of small amplitude cycles included, based on the corrected S–N curve and a method for calculating the equivalent constant amplitude stress, the node and comprehensive degree of utilization were calculated based on the anti-fatigue design grade of welded joints to evaluate the fatigue strength of a structure under a

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Amiri, Amir Parviz Khosravi. "Non-linear study of base shear and moment of composite columns in MRFs." International Journal of Engineering & Technology 4, no. 1 (2015): 205. http://dx.doi.org/10.14419/ijet.v4i1.4144.

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The main objective of this study is evaluating the seismic behavior of composite columns in MRFs subject to dynamic loads.The design Codes of composite structures contain different views in some cases and therefore conservative provisions, because of lack of enough information about the behavior of these structures. The base shear and moment of structures in non-linear state can be considered as criteria for the potential of a lateral-force-resisting system to dissipate the seismic energy.Lower values of non-linear seismic base reactions indicate better efficacy of the system. In this study th

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Pecník, Miroslav, Viktor Borzovič, and Kamil Laco. "Non-Linear FEM Analysis of Integral Bridges Transition Area." Solid State Phenomena 259 (May 2017): 152–57. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.152.

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The transition area of bridges is non-homogeneous solid, which consists of soil embankment, transition slab and roadway layers. These transition area elements consist of various materials with different properties. Besides the imposed loads, behavior of these areas is significantly affected by uneven settlement between the bridge abutment and soil embankment. In case of integral bridges horizontal movements of a bridge caused mostly by temperature and ongoing rheological phenomena in concrete have to be taken into account. This leads to abutment deformation in combination with time dependent s

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35

Kumar, L. Ravi, P. K. Datta, and D. L. Prabhakara. "Dynamic instability characteristics of doubly curved panels subjected to partially distributed follower edge loading with damping." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 218, no. 1 (2004): 67–81. http://dx.doi.org/10.1243/095440604322786956.

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The vibration and dynamic instability characteristics of doubly curved panels subjected to partially distributed non-conservative follower load are studied using finite element analysis. The first-order shear deformation theory is used to model the doubly curved panels, considering the effects of shear deformation and rotary inertia. The theory used is the extension of dynamic, shear deformable theory according to Sander's first approximation for doubly curved shells, which can be reduced to Love's and Donnell's theories by means of tracers. The modal transformation technique is applied to the

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36

Ekenta, O. E. "Catchment Modelling Of Non – Point Source Pollution Accretion For Rivers." European Scientific Journal, ESJ 12, no. 2 (2016): 309. http://dx.doi.org/10.19044/esj.2016.v12n2p309.

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Catchment process simulation models are designed to model the interaction of hydrological, geochemical and ecological processes and the effects of change. TOMCAT, a catchment scale model was applied in modeling the transport of determinands from non-point (diffuse) sources to Mimram river, a tributary of the river Thames. The magnitude and timing of the processes taking place is stochastic with the model representing as accurately as possible the systematic and random variability of various model inputs and their inter-relationships. The results indicate that the BOD, NH4N and Un-ionised NH3 l

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37

Scott, Samuel, Peter Greaves, Terence Macquart, and Alberto Pirrera. "Comparison of blade optimisation strategies for the IEA 15MW reference turbine." Journal of Physics: Conference Series 2265, no. 3 (2022): 032029. http://dx.doi.org/10.1088/1742-6596/2265/3/032029.

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Abstract Reference wind turbine models are crucial for enabling the research community to advance technology and meet the challenges associated with upscaling. The IEA 15 MW is one such reference model, designed using NREL’s WISDEM tool, which enables researchers to perform system-level analysis and optimisation. However, the authors have found the blade to be structurally infeasible when subject to aero-servo-elastic simulations and finite-element (FE) analyses. Given the shortcomings, this work aims to develop an updated blade model for the 15 MW turbine platform using the design tool Aeroel

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38

Dawood, Shilan Nawzad, Abdulsalam Rasheed Al-Zahawi, and Laith Abed Sabri. "Mechanical and Thermal Stress Behavior of a Conservative Proposed Veneer Preparation Design for Restoring Misaligned Anterior Teeth: A 3D Finite Element Analysis." Applied Sciences 10, no. 17 (2020): 5814. http://dx.doi.org/10.3390/app10175814.

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The objective of this study was to evaluate the biomechanical and thermal behavior of a proposed preparation design as a conservative treatment option that aims to preserve both gingival and tooth health structures through a comparative finite element analysis with non-preparation and conventional designs. 3D solid models of laminate veneers with different preparation designs were obtained using cone-beam computed tomography (CBCT) scanning of the maxillary incisor. A 100-Newton load was applied with angulations of 60° and 125° to the longitudinal axis of the tooth to determine the stresses du

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Sree, Phani C. R., and Daniel Kujawski. "A Deviatoric Stress-Strain Function for Fatigue Life Analysis." Advanced Materials Research 891-892 (March 2014): 797–802. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.797.

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The Smith-Watson-Topper (SWT) parameter was originally suggested and is still widely used to account for mean stress effects in fatigue life analysis. It is well recognized however, that the SWT parameter might be non-conservative for cyclic loads that involve relatively large compressive mean stresses. Such large compressive mean stresses can develop in notches after overloads. An energy interpretation of the SWT parameter is presented first. Based on analogy with the Neuber’s rule a new deviatoric formulation of the SWTD parameter is proposed. It is found that for positive mean stresses and

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Galletly, G. D., and K. Pemsing. "Interactive Buckling Tests on Cylindrical Shells Subjected to Axial Compression and External Pressure—A Comparison of Experiment, Theory and Various Codes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 199, no. 4 (1985): 259–80. http://dx.doi.org/10.1243/pime_proc_1985_199_123_02.

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The buckling of welded steel cylindrical shells under the combined action of external pressure and axial compressive loads is of considerable interest to the offshore oil and nuclear industries. However, test results on this subject are scarce and some design rules which have been proposed recently have not been validated experimentally, especially in the plastic buckling region. In order to check these rules, and suggest others, interactive buckling tests were conducted at Liverpool University on cylindrical shells having R/t ≍ 100. One series of tests consisted of 19 machined and stress-reli

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Yongbing, FENG. "Seismic Performance Analysis of Continuous Rigid Frame Bridges in Expressway under Non-linear Interactions of Soil-Piles." MATEC Web of Conferences 175 (2018): 04037. http://dx.doi.org/10.1051/matecconf/201817504037.

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Taking the three-span pre-stressed concrete continuous rigid frame bridge as an engineering example, MIDAS Civil was utilized to establish a spatial finite element model and the interaction between pile foundation and the soil was simulated by equivalent soil spring. In addition to analyzing shearing force, bending moment and stress of the primary beam's characteristic section under different loads, a response spectrum method and time history analysis were adopted to conduct seismic response analysis respectively. In this case, performance of the bridge could be comprehensively evaluated. Rele

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Souza, Larissa R., Ruben B. Godoy, Matheus A. de Souza, Luigi G. Junior, and Moacyr A. G. de Brito. "Sampling Rate Impact on Electrical Power Measurements Based on Conservative Power Theory." Energies 14, no. 19 (2021): 6285. http://dx.doi.org/10.3390/en14196285.

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This article presents a study of the sampling rate effect on electrical power measurements whose definitions are based on the Conservative Power Theory (CPT). The definitions of active power and reactive power of the CPT were applied in the MATLAB® software by varying the sampling rate and using a digital power meter as a reference. The measurements were performed in scenarios with linear and non-linear loads. Due to the usage of an integral in the CPT calculus, an error was verified associated with the reactive power being inversely proportional to the sampling rate. From the present study, i

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Reem Sabouni. "Sustainability Considerations for Underground Concrete Manholes." Electronic Journal of Structural Engineering 13, no. 2 (2013): 50–55. http://dx.doi.org/10.56748/ejse.131722.

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Sewer systems enclose one of the harshest environments on concrete materials. These systems if made of concrete are usually accessed for maintenance and inspection by precast concrete manholes. The present design practices of these shafts components in Canada are generally conservative which results in heavily reinforced bases. If verified by full scale testing the code allows the use of alternative manhole design. To produce a more sustainable precast concrete manhole the steel reinforcement has to be minimized or even eliminated altogether if possible. In the course of introducing a more sus

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VACARU, RALUCA-PAULA, SILVIA PER, IOANA-ANDREEA STANCIU, et al. "Clinical and microbiological features of carious dentin in immature permanent molars." Romanian Biotechnological Letters 26, no. 1 (2021): 2340–46. http://dx.doi.org/10.25083/rbl/26.1/2340.2346.

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The present study aimed to assess the dentin lesion activity in non-superficial carious lesions affecting vital immature permanent molars and to investigate possible associations between microbiological status, clinical dentin alterations, and salivary cortisol levels. Study sample consisted of a total number of 22 immature permanent molars of 13 children. After clinical estimation of lesion activity, a fine sample of deep dentin layer was removed and inoculated on bacteria tests. Salivary cortisol was assessed using an ELISA method. Most molars were diagnosed as actively carious progressing.

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Ellobody, Ehab. "Finite element modelling and design of composite bridges with profiled steel sheeting." Advances in Structural Engineering 20, no. 9 (2016): 1406–30. http://dx.doi.org/10.1177/1369433216678865.

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This article discusses the non-linear analysis and design of highway composite bridges with profiled steel sheeting. A three-dimensional finite element model has been developed for the composite bridges, which accounted for the bridge geometries, material non-linearities of the bridge components, bridge boundary conditions, shear connection, interactions among bridge components and bridge bracing systems. The simply supported composite bridge has a span of 48 m, a width of 13 m and a depth of 2.3 m. The bridge components were designed following the European code for steel–concrete composite br

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Shoji, Hiroaki, Atsushi Teramoto, Yuzuru Sakakibara, Tomoaki Kamiya, Kota Watanabe, and Toshihiko Yamashita. "Stability of the ankle joint in anatomical or non-anatomical anterior talofibular ligament repair." Foot & Ankle Orthopaedics 3, no. 3 (2018): 2473011418S0044. http://dx.doi.org/10.1177/2473011418s00446.

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Category: Ankle Introduction/Purpose: Chronic ankle instability (CAI) often needs surgical treatment if conservative treatment is ineffective. Recently, arthroscopic surgeries have become widely used to treat CAI. Although it is crucial to accurately ascertain the anterior talofibular ligament (ATFL) attachment site under arthroscopy, previous study showed that it might not be feasible to thoroughly observe the ATFL attachment site, and repair or reconstruction position were often unintentionally carried out proximal to the ATFL attachment site at the fibula as a result. Currently, there are f

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Nunes, Riterson, and Wanderson Maia. "ANÁLISE NUMÉRICA DE CANTONEIRAS ENRIJECIDAS ASSIMÉTRICAS DE AÇO FORMADAS A FRIO SUBMETIDAS À COMPRESSÃO CENTRADA." COLLOQUIUM EXACTARUM 13, no. 4 (2021): 54–68. http://dx.doi.org/10.5747/ce.2021.v13.n4.e376.

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The present work brings a numerical, non-linear physical and geometric analysis using the Finite Element Method, of asymmetrical stiff angles, using the Ansys software. The simulations employed two magnitudes of initial imperfections, and aimed to find the critical buckling loads and failure modes, observing local, global instabilities and the interaction between both. The results obtained were compared with experimental tests, performed by Young and Chen (2008), and with the values proposed by the brazilian standard ABNT NBR 14762: 2010, using the Direct Resistance Method. The procedure adopt

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Dutkiewicz, Maciej, Andrii Velychkovych, Ivan Shatskyi, and Vasyl Shopa. "Efficient Model of the Interaction of Elastomeric Filler with an Open Shell and a Chrome-Plated Shaft in a Dry Friction Damper." Materials 15, no. 13 (2022): 4671. http://dx.doi.org/10.3390/ma15134671.

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The results of a study of the contact interaction of an open shell and a chrome-plated shaft with elastomeric filler installed coaxially are presented. The considered contact system is a model of the original design of the shell damper of dry friction. The design feature is the following: the bearing link of the damper is a thin-walled cylindrical shell with a cut along the generatrix; the working body of the damper is elastomeric filler; a hollow chrome-plated shaft centers the damper elements and allows it to be used in technological processes with the presence of aggressive and abrasive-con

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Anjum, Waqas, Abdul Rashid Husain, Junaidi Abdul Aziz, Syed Muhammad Fasih ur Rehman, Muhammad Paend Bakht, and Hasan Alqaraghuli. "A Robust Dynamic Control Strategy for Standalone PV System under Variable Load and Environmental Conditions." Sustainability 14, no. 8 (2022): 4601. http://dx.doi.org/10.3390/su14084601.

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Dual-stage standalone photovoltaic (PV) systems suffer from stability, reliability issues, and their efficiency to deliver maximum power is greatly affected by changing environmental conditions. A hybrid back-stepping control (BSC) is a good candidate for maximum power point tracking (MPPT) however, there are eminent steady-state oscillations in the PV output due to BSC’s recursive nature. The issue can be addressed by proposing a hybrid integral back-stepping control (IBSC) algorithm where the proposed integral action significantly reduces the steady-state oscillations in the PV array output

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Cicero, Sergio, Juan Fuentes, Isabela Procopio, Virginia Madrazo, and Pablo González. "Critical Distance Default Values for Structural Steels and a Simple Formulation to Estimate the Apparent Fracture Toughness in U-Notched Conditions." Metals 8, no. 11 (2018): 871. http://dx.doi.org/10.3390/met8110871.

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The structural integrity assessment of components containing notch-type defects has been the subject of extensive research in the last few decades. The assumption that notches behave as cracks is generally too conservative, making it necessary to develop assessment methodologies that consider the specific nature of notches, providing accurate safe predictions of failure loads or defect sizes. Among the different theories or models that have been developed to address this issue the Theory of Critical Distances (TCD) is one of the most widely applied and extended. This theory is actually a group

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