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Journal articles on the topic 'Viscous damping and axial force'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Akinpelu, F. O. "Dynamic Response of Rayleigh Beam with Axial Force to Partially Distributed Moving Loads Resting on Linear and Nonlinear Viscoelastic Foundation." European Journal of Advances in Engineering and Technology 7, no. 7 (2020): 19–28. https://doi.org/10.5281/zenodo.10667193.

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<strong>ABSTRACT</strong> The response of Rayleigh beam with axial force resting on a nonlinear Pasternak foundation with viscous damping subject to a partially distributed moving loads was investigated. The nonlinear Pasternak foundation is assumed to be a cubic. The governing equation of fourth order partial differential equation was reduced to second order nonlinear ordinary differential equation by assuming a solution in terms of series form and then solve numerically using the Maple software to obtain the result for the moving loads and moving force. The effects of rotary inertia, speed,

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2

Gu, Fan, Jing Hai Zhou, Hong Hai, and Yan Sheng Song. "Pullout Test Study on Flexible Joint of Ductile Iron Buried Pipelines." Advanced Materials Research 368-373 (October 2011): 1130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1130.

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Axial pullout test on ductile iron buried pipelines with MTS testing machine was carried out, the relation curve between axial tension and flexiable joint displacement was gotten, the functional failure mechanism of flexible joint of buried pipeline was discussed. The results indicate that there is relative displacement between pipe and soil under seismic action, meanwhile, the acting force between pipe and soil is the viscous damping force which is related to pipe-soil relative speed.

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3

Ku, C. P. Roger, J. F. Walton, and J. W. Lund. "Dynamic Coefficients of Axial Spline Couplings in High-Speed Rotating Machinery." Journal of Vibration and Acoustics 116, no. 3 (1994): 250–56. http://dx.doi.org/10.1115/1.2930421.

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This paper provided the first opportunity to quantify the angular stiffness and equivalent viscous damping coefficients of an axial spline coupling used in highspeed turbomachinery. The bending moments and angular deflections transmitted across an axial spline coupling were measured while a nonrotating shaft was excited by an external shaker. A rotordynamics computer program was used to simulate the test conditions and to correlate the angular stiffness and damping coefficients. The effects of external force and frequency were also investigated. The angular stiffness and damping coefficients w

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4

Pavlovic, Ratko, and Ivan Pavlovic. "Dynamic stability of Timoshenko beams on Pasternak viscoelastic foundation." Theoretical and Applied Mechanics 45, no. 1 (2018): 67–81. http://dx.doi.org/10.2298/tam171103005p.

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The dynamic stability problem of a Timoshenko beam supported by a generalized Pasternak-type viscoelastic foundation subjected to compressive axial loading, where rotary inertia is neglected, is investigated. Each axial force consists of a constant part and a time-dependent stochastic function. By using the direct Liapunov method, bounds of the almost sure asymptotic stability of a beam as a function of viscous damping coefficient, variance of the stochastic force, shear correction factor, parameters of Pasternak foundation, and intensity of the deterministic component of axial loading are obt

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5

Pavlovic, Ratko, P. Kozic, and G. Janevski. "Influence of rotatory inertia on stochastic stability of a viscoelastic rotating shaft." Theoretical and Applied Mechanics 35, no. 4 (2008): 363–79. http://dx.doi.org/10.2298/tam0804363p.

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The stochastic stability problem of a viscoelastic Voigt-Kelvin balanced rotating shaft subjected to action of axial forces at the ends is studied. The shaft is of circular cross-section, it rotates at a constant rate about its longitudinal axis of symmetry. The effect of rotatory inertia of the shaft cross-section and external viscous damping are included into account. The force consists of a constant part and a time-dependent stochastic function. Closed form analytical solutions are obtained for simply supported boundary conditions. By using the direct Liapunov method almost sure asymptotic

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6

Cesmeci, Sevki, Faramarz Gordaninejad, Keri L. Ryan, and Walaa Eltahawy. "A liquid spring–magnetorheological damper system under combined axial and shear loading for three-dimensional seismic isolation of structures." Journal of Intelligent Material Systems and Structures 29, no. 18 (2018): 3517–32. http://dx.doi.org/10.1177/1045389x18783090.

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This study focuses on experimental investigation of a fail-safe, bi-linear, liquid spring magnetorheological damper system for a three-dimensional earthquake isolation system. The device combines the controllable magnetorheological damping, fail-safe viscous damping, and liquid spring features in a single unit serving as the vertical component of a building isolation system. The bi-linear liquid spring feature provides two different stiffnesses in compression and rebound modes. The higher stiffness in the rebound mode prevents a possible overturning of the structure during rocking mode. For pr

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7

Li, Yan Tao, Cheng Xiang Xu, and Guo Feng Du. "Seismic Performance of T-Shaped CFT Column to Steel Frame Beam Connection – Experimental Study." Advanced Materials Research 919-921 (April 2014): 951–59. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.951.

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The focus of this research program is T-shaped CFT central column to steel frame beam connection. 3 joints with strong columns-weak beams and 1 joint with strong beams-weak columns 1:2 scale specimens were tested under constant axial loads and cyclic horizontal loads. Overall impact of axial force ratio and beam to column linear stiffness ratio on joint failure mechanism, hysteretic behavior, deformation ductility, and energy dissipation capability was investigated. Results showed that the failure mechanism for specimens with strong columns-weak beams was local buckling of the steel beam flang

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8

Lad, Pranav, and V. Kartik. "Stability transitions of an axially moving string subjected to a distributed follower force." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2213 (2018): 20170779. http://dx.doi.org/10.1098/rspa.2017.0779.

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The transverse vibrations of an axially moving string that is subjected to a distributed follower force are examined here. This model provides an insight into the complex dynamics of seemingly simpler systems such as silicon wafer cutting using wire saws, and aerial or marine towing, where a relatively long flexible structure is dragged through fluid. The equation of motion is derived and it includes the axial variation in the tension that arises due to acceleration and the follower force. As the exact analytical solution of this equation is difficult to determine, the approximate closed-form

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9

S.O., Sangoniyi, and Akinpelu F.O. "Response of beam with viscously damped axial force on elastic foundation." American Based Research Journal 6, no. 12 (2017): 78–86. https://doi.org/10.5281/zenodo.3445914.

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<em>This paper examined the response of beam with viscously damped axial force on elastic foundation. The effects of the moving loads on beam with respect to the moving force and the moving mass were examined. The fourth order partial differential equation which is the governing equation was solved in form of series solution to obtain two distinct equations for both the moving force and the moving mass. These were finally solved numerically using maple software to determine the behaviour of the system under consideration. The results of the findings revealed that as damping coefficient (&omega

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10

Eldesoky, Islam M., Ramzy M. Abumandour, and Essam T. Abdelwahab. "Analysis for Various Effects of Relaxation Time and Wall Properties on Compressible Maxwellian Peristaltic Slip Flow." Zeitschrift für Naturforschung A 74, no. 4 (2019): 317–31. http://dx.doi.org/10.1515/zna-2018-0479.

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AbstractThe present study is related to indicating the several effects of the relaxation time, dynamic behaviour of wall properties and slip conditions at the boundaries on the peristaltic locomotion of viscous non-Newtonian Maxwell fluid flow through a two-dimensional (2D) horizontal flexible sinusoidal wave-shaped channel. An approximated theoretical model is constructed. The solution of the governing equations is developed using the perturbation method. Small amplitude ratio “ratio between amplitude of the wave and half channel width” for the wavy transport is considered for describing the

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11

Kartik, V., and J. A. Wickert. "Surface Friction Guiding for Reduced High-Frequency Lateral Vibration of Moving Media." Journal of Vibration and Acoustics 129, no. 3 (2006): 371–79. http://dx.doi.org/10.1115/1.2732354.

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The free and forced vibration of a moving medium is examined in an application where distributed friction guiding is used to control lateral position passively. Subambient pressure features formed in the guides intentionally modify the naturally occurring self-pressurized air bearing and increase the contact force between the medium and the guide’s surface. These features increase friction to a level beyond that achievable based on the nominal wrap pressure. The moving medium is modeled as a beam that is transported over frictional regions and subjected to prescribed boundary disturbances aris

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12

Amabili, M., F. Pellicano, and M. A. Pai¨doussis. "Nonlinear Stability of Circular Cylindrical Shells in Annular and Unbounded Axial Flow." Journal of Applied Mechanics 68, no. 6 (2001): 827–34. http://dx.doi.org/10.1115/1.1406957.

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The stability of circular cylindrical shells with supported ends in compressible, inviscid axial flow is investigated. Nonlinearities due to finite-amplitude shell motion are considered by using Donnell’s nonlinear shallow-shell theory; the effect of viscous structural damping is taken into account. Two different in-plane constraints are applied at the shell edges: zero axial force and zero axial displacement; the other boundary conditions are those for simply supported shells. Linear potential flow theory is applied to describe the fluid-structure interaction. Both annular and unbounded exter

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13

Chen, Haosen, Peng Yang, and Yijun Shen. "Vibration Power Flow of an Infinite Cylindrical Shell Submerged in Viscous Fluids." Shock and Vibration 2020 (September 12, 2020): 1–14. http://dx.doi.org/10.1155/2020/8828204.

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In the previous investigations of the vibroacoustic characteristics of a submerged cylindrical shell in a flow field, the fluid viscosity was usually ignored. In this paper, the effect of fluid viscosity on the characteristics of vibration power flow in an infinite circular cylindrical shell immersed in a viscous acoustic medium is studied. Flügge’s thin shell theory for an isotropic, elastic, and thin cylindrical shell is employed to obtain the motion equations of the structure under circumferential-distributed line force. Together with the wave equations for the viscous flow field as well as

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14

Yasuo, A., and M. P. Paidoussis. "Flow-Induced Instability of Heat-Exchanger Tubes due to Axial Flow in a Diffuser-Shaped, Loose Intermediate Support." Journal of Pressure Vessel Technology 111, no. 4 (1989): 428–34. http://dx.doi.org/10.1115/1.3265700.

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In some heat exchangers and steam generators, the flow is predominantly axial, and the external fluid flows between baffled compartments through enlarged holes in the baffles around the heat exchanger tubes. Thus, the tube is subjected to relatively high flow velocities over small portions of its length, in the baffle locations. In this paper, the dynamics of such an idealized system is investigated, involving a cylindrical beam with pinned ends in axial flow, going through a baffle plate of finite thickness at some intermediate point, with small radial clearance. The fluid forces along the tu

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15

Mateescu, D., M. P. Paidoussis, and W. G. Sim. "Three-Dimensional Viscous Flows Between Concentric Cylinders Executing Axially Variable Oscillations: A Hybrid Spectral/Finite Difference Solution." Journal of Applied Mechanics 62, no. 3 (1995): 667–73. http://dx.doi.org/10.1115/1.2895998.

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A hybrid spectral/finite difference method is developed in this paper for the analysis of three-dimensional unsteady viscous flows between concentric cylinders subjected to fully developed laminar flow and executing transverse oscillations. This method uses a partial spectral collocation approach, based on spectral expansions of the flow parameters in the transverse coordinates and time, in conjunction with a finite difference discretization of the axial derivatives. The finite difference discretization uses central differencing for the diffusion derivatives and a mixed central-upwind differen

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16

Shen, Zhongyuan, and Xue Bai. "Multibody System Discrete Time Transfer Matrix Method for Nonlinear Shear Dynamic analysis of Immersed Tunnels." E3S Web of Conferences 236 (2021): 02035. http://dx.doi.org/10.1051/e3sconf/202123602035.

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Shear seismic response analysis is critical for seismic design of immersed tunnels. According to the structural characters of immersed tunnels and shear dynamic response of their joints, a multibody dynamic model consisting of multi-rigid body, shear hinge, and viscous damping hinge is proposed for shear response analysis, in which the dynamic stiffness of the shear hinge is divided into two stages based on a threshold. Following the discrete time transfer matrix method for multibody system dynamics (MS-DT-TMM), the mechanical model and mathematical expression of each tunnel element is derived

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17

Wang, Jinyan, Qinglu Li, Yuzhou Sun, Yi Zhao, Zhonghao Niu, and Xiaofen Li. "Seismic Behavior of T-Shaped Concrete-Filled Steel Tubular Column to Steel Beam Joints with Side Plates." Advances in Civil Engineering 2023 (December 16, 2023): 1–16. http://dx.doi.org/10.1155/2023/6698598.

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This study investigates the seismic behavior of the T-shaped concrete-filled steel tubular (CFST) column to steel beam joints, aimed at expanding their applicability in areas with high-seismic fortification intensity. A construction form of T-shaped CFST column to steel beam joint with side plates is presented. The variables studied in these experiments include the side plate length, the axial compression ratio, the presence of side plates, and the presence of binding bars. The force mechanism, failure modes, load–displacement curves, strength, stiffness, ductility, and energy dissipation capa

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18

Taniwangsa, Wendy. "Seismic Performance of a Base-Isolated Demonstration Building." Earthquake Spectra 18, no. 4 (2002): 777–93. http://dx.doi.org/10.1193/1.1517065.

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This paper presents the dynamic analyses and seismic performance of a base-isolated demonstration building (BIDB). This building was designed and built in Indonesia in accordance with the Indonesian Seismic Code (ISC) and the Uniform Building Code (UBC) provisions for isolated buildings. The building is a four-story reinforced concrete frame with masonry infill walls supported on 16 high damping natural rubber (HDNR) isolators attached to the superstructure using recessed connections. The building superstructure was modeled using both three-dimensional (3-D) and two-dimensional (2-D) frame mod

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19

Wang, Bo, and Youqi Tang. "Research on Time Delay Feedback Control of Lateral Vibration Axially Moving Viscoelastic Beam." Journal of Physics: Conference Series 2215, no. 1 (2022): 012012. http://dx.doi.org/10.1088/1742-6596/2215/1/012012.

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Abstract The nonlinear dynamic behavior of a viscoelastic beam in axially variable motion under time delay is studied. Considering that the axial velocity pulsation and radial tension change periodically with time under the action of time delay, the viscous damping and finite support stiffness are taken into account, and the viscoelastic constitutive relationship adopts Kelvin model. A mathematical model of lateral vibration of an axially moving viscoelastic beam with changes in axial velocity and tension under time delay is established, and a partial differential-integral control equation des

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20

Zhang, Guang, Huixing Wang, Ouyang Qing, and Jiong Wang. "Numerical analysis of multiphysical field for independent three-stage magnetorheological damper of double rod during recoil process of artillery." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 14 (2019): 4960–79. http://dx.doi.org/10.1177/0954406219838583.

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In order to investigate the multiphysics in the recoil process of magnetorheological damper, independent three-stage magnetorheological damper of double rod has been designed. The magnetorheological gel with carbonyl iron powder mass fraction of 70% (MRG-70) has been prepared and the steady-state shear test was carried out for obtaining the consistency coefficient k and the non-Newtonian index n of the Herschel–Bulkley model. MRG-70 has been applied to the damper and the motion analysis of the recoil part has been carried out by combining the law of chancing of the bore resultant force of a ce

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21

Oborskyi, H., A. Orgiyan, V. Тikhenko, A. Balaniuk, and V. Kolesnik. "DYNAMIC VIBRATION DAMPERS FOR CONSOLE INSTRUMENTS." Odes’kyi Politechnichnyi Universytet Pratsi 1, no. 65 (2022): 5–15. http://dx.doi.org/10.15276/opu.1.65.2022.01.

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The maximum efficiency of dynamic vibration dampers (DD) is achieved at optimal values of their parameters. Inertial DD are tuned according to their own frequency and damping, and the optimal values of the absorber parameters depend on the spectral composition of the suppressed oscillations. For nonlinear DD, the optimal values of parameters (for example, gap or precompression) also depend on the intensity of external influences on the object. For multi-element DDs, the number of damper inertial elements should also be optimized. The conditions for optimal tuning of the inertial DD are the con

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22

Zhao, Guo Hui, and Yu Min Zhang. "Parametric Sensitivity Study on Fluid Viscous Damper of Long Span Suspension Bridge." Advanced Materials Research 255-260 (May 2011): 998–1002. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.998.

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Damping coefficient and damping exponent play a dominant role on the displacement constraint effect and the damping force of the fluid viscous damper. In this paper, parametric sensitivity study of the fluid viscous damper is carried out by using nonlinear dynamic time history method based on a long suspension bridge. Acceptable damping force and reasonable displacement between stiffening girder and tower are set as the optimization objectives of the damping parameters. It is shown that: as to long suspension bridge, bigger damping coefficient can lower the displacement but increase the force

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23

Budny, Dan D., D. C. Wiggert, and F. J. Hatfield. "The Influence of Structural Damping on Internal Pressure During a Transient Pipe Flow." Journal of Fluids Engineering 113, no. 3 (1991): 424–29. http://dx.doi.org/10.1115/1.2909513.

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A four equation model of axial wave propagation with Poisson coupling which includes viscous damping to account for structural energy dissipation is evaluated. Comparison of the predictions with experimental data indicates that the model can satisfactorily predict fluid pressure and structural velocity. The results show that structural damping reduces the pressure peaks during a transient event by eliminating the high frequency components. For the conditions studied, this reduction was 20 to 25 percent for a piping system with no axial constraints. A saddle-type support increases the equivalen

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24

Guntur, Harus Laksana, and Wiwiek Hendrowati. "A Comparative Study of the Damping Force and Energy Absorbtion Capacity of Regenerative and Conventional-Viscous Shock Absorber of Vehicle Suspension." Applied Mechanics and Materials 758 (April 2015): 45–50. http://dx.doi.org/10.4028/www.scientific.net/amm.758.45.

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This paper presents a comparative study of the damping force and energy absorbtion capacity of a typical conventional-viscous and a regenerative shock absorber for vehicle suspension. Regenerative shock absorber (RSA) is a shock absorber which can regenerate the dissipated vibration energy from vehicle suspension into electricity. In this research, a prototype of regenerative shock absorber was developed, its damping force and energy absorbtion capacity were tested, and the results were analized and compared with those of a typical conventional-viscous shock absorber. The regenerative and visc

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25

CHAUHAN, Vinod, Ashwani KUMAR, and Radhey SHAM. "Numerical Investigation of Yield Stress and Damping Force for a Modeled Damper Using Different MR Fluids." Mechanics 31, no. 3 (2025): 230–36. https://doi.org/10.5755/j02.mech.37031.

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This article presents the yield stress, shear damping force, viscous damping force, and total damping force generated in a modeled damper using various magnetorheological (MR) fluids. The values of the generated magnetic field intensity in a modeled damper have been obtained by performing a magnetostatic analysis using ANSYS Maxwell v.16 software. All the used MR fluids exhibit growth in yield stress and damping force on increasing the input current. The magnetic field intensity values are fitted into yield stress-magnetic field intensity quadratic equations which are developed for all the use

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26

Wang, Wei Ning, Wei Ming Yan, and Yan Jiang Chen. "Effect of Laminar Flow to Velocity Exponent of Viscous Damper." Advanced Materials Research 602-604 (December 2012): 1517–21. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.1517.

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The relationship between the energy dissipation and the damping force is studied through experimental and analytical research of the effect of laminar flow of viscous damper, and a linear viscous damper model and the calculation formulas are obtained.The results show that the linear flow model is the key factor to get a linear relationship between speeds and damping force.

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27

Guo, Qiang, Yan Bei Chen, Xiang Liang Ning, and Lu Tang. "Speedy Design Method for Fluid Viscous Dampers Based on Numerical Simulation by CFD." Advanced Materials Research 446-449 (January 2012): 3869–74. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.3869.

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Bi-directional-cylinder viscous fluid dampers are studied numerically. Based on the power-law characteristic of silicone oil，the flow pattern of silicone oil is analyzed, the non-Newtonian fluid power-law model’s influence on the energy dissipation characteristic and the damping resistance of viscous dampers is discussed, and the calculation formulas are presented. The damping force of the viscous damper samples is simulated by professional CFD software based on the dynamic mesh model, Based on comprehensive analysis of the results, the experiential design method of large-tonnage-damping-force

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28

Whittaker, Andrew S., Michael C. Constantinou, Oscar M. Ramirez, Martin W. Johnson, and Christis Z. Chrysostomou. "Equivalent Lateral Force and Modal Analysis Procedures of the 2000 NEHRP Provisions for Buildings with Damping Systems." Earthquake Spectra 19, no. 4 (2003): 959–80. http://dx.doi.org/10.1193/1.1622391.

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Equivalent lateral force and modal analysis procedures for yielding buildings with damping systems were developed, validated, and incorporated in the 2000 NEHRP Provisions. The technical basis for each procedure is described in the paper together with the simplifications adopted for inclusion in the Provisions. Procedures for calculating the effective damping and effective period and higher mode damping ratios for buildings equipped with yielding, viscoelastic, linear viscous, and nonlinear viscous damping devices are presented.

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Teng, Xiaoyan, Nan Liu, and Jiang Xudong. "Vibrational Energy Flow Model for a High Damping Beam with Constant Axial Force." Mathematical Problems in Engineering 2020 (July 17, 2020): 1–11. http://dx.doi.org/10.1155/2020/3584048.

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The energy flow analysis (EFA) method is developed to predict the energy density of a high damping beam with constant axial force in the high-frequency range. The energy density and intensity of the beam are associated with high structural damping loss factor and axial force and introduced to derive the energy transmission equation. For high damping situation, the energy loss equation is derived by considering the relationship between potential energy and total energy. Then, the energy density governing equation is obtained. Finally, the feasibility of the EFA approach is validated by comparin

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30

Huang, Shujuan, Diana-Andra Borca-Tasciuc, and John A. Tichy. "A simple expression for fluid inertia force acting on micro-plates undergoing squeeze film damping." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467, no. 2126 (2010): 522–36. http://dx.doi.org/10.1098/rspa.2010.0216.

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Squeeze film damping in systems employing micro-plates parallel to a substrate and undergoing small normal vibrations is theoretically investigated. In high-density fluids, inertia forces may play a significant role affecting the dynamic response of such systems. Previous models of squeeze film damping taking inertia into account do not clearly isolate this effect from viscous damping. Therefore, currently, there is no simple way to distinguish between these two hydrodynamic effects. This paper presents a simple solution for the hydrodynamic force acting on a plate vibrating in an incompressib

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Li, Qin, Bo Chen, Zhiqiang Huang, Haipin Tang, Gang Li, and Lei He. "Study on Equivalent Viscous Damping Coefficient of Sucker Rod Based on the Principle of Equal Friction Loss." Mathematical Problems in Engineering 2019 (April 15, 2019): 1–12. http://dx.doi.org/10.1155/2019/9272751.

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Equivalent viscous damping coefficient is an important parameter of wave equation for sucker rod string. In this paper, based on the principle of equal friction loss, when the viscous energy consumption and the local damping energy consumption are taken into account, effects of equivalent viscous damping coefficients are obtained. Through deducing energy consumption equation of oil and energy consumption equation of the coupling, theoretical formula for equivalent damping coefficient of sucker rods is received. Results show that the smaller the K is (K is the ratio of sectional area of tubing

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Zhang, Kewei, Zhe Chen, Qianke Zhu, Yong Jiang, Wenfeng Liu, and Peixuan Wu. "Damping Force and Loading Position Dependence of Mass Sensitivity of Magnetoelastic Biosensors in Viscous Liquid." Sensors 19, no. 1 (2018): 67. http://dx.doi.org/10.3390/s19010067.

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We established the vibration governing equation for a magnetoelastic (ME) biosensor with target loading in liquid. Based on the equation, a numerical simulation approach was used to determine the effect of the target loading position and viscous damping coefficient on the node (“blind points”) and mass sensitivity (Sm) of an ME biosensor under different order resonances. The results indicate that viscous damping force causes the specific nodes shift but does not affect the overall variation trend of Sm as the change of target loading position and the effect on Sm gradually reduces when the tar

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Chai, Y. H., and Mervyn J. Kowalsky. "Influence of Nonviscous Damping on Seismic Inelastic Displacements." International Journal of Structural Stability and Dynamics 15, no. 05 (2015): 1450074. http://dx.doi.org/10.1142/s0219455414500746.

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Viscous damping, which assumes a resisting force proportional to the instantaneous velocity, results in energy dissipation that increases linearly with frequency. Such energy dissipation, however, is not strongly supported by experiments. The energy dissipative characteristics of damping can be improved by nonviscous hereditary model, where the damping force is treated as dependent on the response history. A weighting function with built-in exponential decay can be used to represent the fading memory of damping where the recent history is given a greater influence over its distant past. This p

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KUNNEN, R. P. J., B. J. GEURTS, and H. J. H. CLERCX. "Experimental and numerical investigation of turbulent convection in a rotating cylinder." Journal of Fluid Mechanics 642 (December 23, 2009): 445–76. http://dx.doi.org/10.1017/s002211200999190x.

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The effects of an axial rotation on the turbulent convective flow because of an adverse temperature gradient in a water-filled upright cylindrical vessel are investigated. Both direct numerical simulations and experiments applying stereoscopic particle image velocimetry are performed. The focus is on the gathering of turbulence statistics that describe the effects of rotation on turbulent Rayleigh–Bénard convection. Rotation is an important addition, which is relevant in many geophysical and astrophysical flow phenomena.A constant Rayleigh number (dimensionless strength of the destabilizing te

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Labise, Chloe C., Geoffrey W. Rodgers, Gregory A. MacRae, and J. Geoffrey Chase. "Viscous and hysteretic damping." Bulletin of the New Zealand Society for Earthquake Engineering 45, no. 1 (2012): 23–30. http://dx.doi.org/10.5459/bnzsee.45.1.23-30.

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Capacity design, while protecting a structure against undesirable energy dissipations, has major implications on member sizes and overall cost. Furthermore, in some situations where protected elements possess some inelastic deformation capacity, it may be unwarranted. One of these situations is when the forces applied to the protected elements result from viscous dampers. This is because when viscous forces cause yielding in an element, the element deforms, so no deformation in the viscous damper is required. If no deformation is required, the velocity is zero, so there is no force. This impli

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Weber, Felix, Simon Spensberger, Florian Obholzer, Johann Distl, and Christian Braun. "Semi-Active Cable Damping to Compensate for Damping Losses Due to Reduced Cable Motion Close to Cable Anchor." Applied Sciences 12, no. 4 (2022): 1909. http://dx.doi.org/10.3390/app12041909.

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The relative motion of transverse cable dampers is smaller than predicted by the taut string model because of the effects of bending stiffness and fixed support conditions. As a result of the reduced damper motion, the dissipated energy per cycle is reduced as well, which may explain why damping measurements on real stay cables with transverse dampers often show lower cable damping ratios than expected from the taut string theory. To compensate for the reduced damper motion and damper efficiency, respectively, a semi-active cable damper is proposed. The controllable damper is realized by a hyd

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Hazaveh, Nikoo K., Geoffrey W. Rodgers, J. Geoffrey Chase, and Stefano Pampanin. "Passive direction displacement dependent damping (D3) device." Bulletin of the New Zealand Society for Earthquake Engineering 51, no. 2 (2018): 105–12. http://dx.doi.org/10.5459/bnzsee.51.2.105-112.

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Viscous fluid damping has been used worldwide to provide energy dissipation to structures during earthquakes. Semi-active dissipation devices have also shown significant potential to re-shape structural hysteresis behaviour and thus provide significant response and damage reduction. However, semi-active devices are far more complex and costly than passive devices, and thus potentially less robust over time. Ideally, a passive device design would provide the unique response behaviour of a semi-active device, but in a far more robust and low-cost device. This study presents the design, developme

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Soheila, Kookalani, and Shen Dejian. "Effect of Fluid Viscous Damper parameters on the seismic performance." Journal of Civil Engineering and Materials Application 4, no. 3 (2020): 141–53. https://doi.org/10.22034/jcema.2020.232288.1025.

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Energy dissipation devices are widely used to enhance the response of structures subjected to dynamic loads caused by wind and earthquake. Especially, viscous dampers are hydraulic devices widely used in structural engineering that dissipate mechanical energy by producing a damping force against the motion. The dampers can mitigate transversal and longitudinal or vertical displacement. It can be set up in different kinds of structures. This study is aimed at comparing the impact of various Fluid viscous damper parameters on the structures under the earthquake. To this aim, a seven-story steel

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Miao, Feng. "Effect of LRB Position for Vibration Reduction System of Self-Anchored Cable-Stayed Suspension Bridge." Advanced Materials Research 974 (June 2014): 346–49. http://dx.doi.org/10.4028/www.scientific.net/amr.974.346.

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Larger displacement and inter-force response of the structure will be produced when self-anchored cable-stayed suspension bridge in longitudinal earthquake. Engineering practice proved that the viscous damper has obviously damping effect for structure. For the vibration reduction system of self-anchored cable-stayed suspension bridge, whose main tower is set viscous damper. This essay does the nonlinear time history analysis under the longitudinal earthquake about the vibration reduction system that considering the LRB putted in different location. Compared with the damping system that only se

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Tang, You-Qi, Deng-Bo Zhang, and Jia-Ming Gao. "Vibration characteristic analysis and numerical confirmation of an axially moving plate with viscous damping." Journal of Vibration and Control 23, no. 5 (2016): 731–43. http://dx.doi.org/10.1177/1077546315586311.

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In this paper, the vibration characteristics of axially moving plates with viscous damping are analyzed. A partial differential linear equation of motion with four simply supported edges is presented. The effects of two different viscous damping models are highlighted, while both of them have been introduced in previous studies. The investigation into the two different viscous damping models is interesting in itself. It is noteworthy that which model is closer to the fact, for which there are no systematic techniques of investigation to deal with this problem. In order to give a reference for

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Gomez, Michael, and Tony Schmitz. "Stability Evaluation for a Damped, Constrained-Motion Cutting Force Dynamometer." Journal of Manufacturing and Materials Processing 6, no. 1 (2022): 23. http://dx.doi.org/10.3390/jmmp6010023.

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This paper describes the dynamic stability evaluation of a constrained-motion dynamometer (CMD) with passive damping. The CMD’s flexure-based design offers an alternative to traditional piezoelectric cutting force dynamometers, which can exhibit adverse effects of the complex structural dynamics on the measurement accuracy. In contrast, the CMD system’s structural dynamics are nominally single degree of freedom and are conveniently altered by material selection, flexure element geometry, and element arrangement. In this research, a passive damping approach is applied to increase the viscous da

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Guo, Hui Juan, Xiu Ping Su, and Xiao Lei Xia. "A Way to Analyze Oil Damping Force of Electromagnetic Release with Oil Dashpot." Applied Mechanics and Materials 313-314 (March 2013): 210–13. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.210.

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t is important for dynamic characteristics of electromagnetic release with oil dashpot to calculate the oil damping force. The formula of the oil damping force is deduced by the theoretical formula of viscous damper or according to the experimental results. Therefore, a way to analyze oil damping force of electromagnetic release with oil dashpot is proposed based on Fluent due to the limitations of the two methods in this paper. The curve which is the speed of the plunger variations of the oil damping force is drawn through the numerical analysis of the flow field and the index of the speed is

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Le, Yun, Jiancheng Fang, and Jinji Sun. "An integrated passive magnetic damping system for high-speed compressor with flexible rotor." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 6 (2014): 1150–61. http://dx.doi.org/10.1177/0954406214542038.

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To provide a more reliable rotor damping system for high-speed compressor with flexible rotor, a passive magnetic damping integrated with an active axial bearing (PMDAB) system is proposed. The PMDAB system can provide active force in axial direction and also can provide damping force without control system in radial direction. To enhance the damping ability of the system, an analytical model is set up especially for the high-speed vibration rotor, and the relation between resistance of radial coils and the provided damping force is discussed for the first time. The coupling characteristic bet

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Sow, C. L., Jaswar Koto, and Hassan Abyn. "Semi-Submersible Heave Response Study Using Diffraction Potential Theory with Viscous Damping Correction." Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) 5, no. 1 (2014): 23–29. https://doi.org/10.36842/jomase.v5i1.512.

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This paper discusses the numerical prediction of the semi-submersible’s heave motion. In the previous study, it is observed that the heave motion response predicted by diffraction potential theory is over-estimated in the region where the heave motion is dominated by damping. In this research, viscous damping is included in the calculation to increase the heave damping magnitude in motion equation. The wave force and added mass of semi-submersible is predicted by diffraction potential theory, only the total damping is corrected by sum-up the linear damping from diffraction potential theory wit

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Qiao, Dong Sheng, and Jin Ping Ou. "Parameter Calculation of Viscous Damper Applied in the Truncated Model Test Design of a Deepwater Semi-Submersible Platform." Advanced Materials Research 168-170 (December 2010): 1480–85. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1480.

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In the equivalent water depth truncated model test design of a deepwater semi-submersible platform, the viscous damper is designed to simulate the contribution of mooring damping to total damping of floating platform. The dissipated energy by a mooring line from the floating platform as a result of its oscillation is applied to calculate the mooring-induced damping. The mooring line and seabed interaction is based on the hypothesis of rigid seabed. The fluid drag force and inertia force on the mooring line are calculated according to the Morrison formula. The non-liner dynamic analysis of moor

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Dowgala, Jeffrey, and Ayhan Irfanoglu. "A Method for Extracting Building Empirical Capacity Curves from Earthquake Response Data." Earthquake Spectra 32, no. 4 (2016): 2229–44. http://dx.doi.org/10.1193/122714eqs219m.

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A method is presented for extracting empirical capacity curves from building earthquake response data. The method can be applied to buildings with acceleration response records from each floor to develop story empirical capacity curves assuming the building has flexible columns and rigid floors. The method can also be applied to buildings with acceleration response records from the roof and ground to develop a fundamental mode empirical capacity curve. The method relies on extracting the restoring force and relative displacement of the system by removing damping force, considered as equivalent

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Li, Shanshan, Biao Wei, Chengjun Zuo, and Xuhui He. "A Numerical Investigation on Scaling Rolling Friction Effects in Shaking Table Model Tests." Shock and Vibration 2019 (October 3, 2019): 1–14. http://dx.doi.org/10.1155/2019/7473031.

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Friction action is a damping mechanism used in civil structures. It often works together with traditional viscous damping. The rolling friction action is nonlinear, and its scaling process in shaking table model tests is suspect, especially in cases of working in combination with traditional viscous dampers. To solve the problem, a numerical model of simplified viscous damper-Coulomb friction base isolation system was scaled. The comparison between the scaled and the prototype model results showed two important factors that influence the scaling of rolling friction action. One factor is the un

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Ionescu, Adriana, Mihai Negru, Cristian Oliviu Burada, and Ramona Pinţoi. "Software Program for Two Levers Damper Configurations Used for Anti-Seismic Protection of the Buildings during Seism." Applied Mechanics and Materials 896 (February 2020): 347–54. http://dx.doi.org/10.4028/www.scientific.net/amm.896.347.

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For a building equipped with anti-seismic devices, the value of the damping force of the dampers positioned at the superstructure is very important for an efficient anti-seismic damping and therefore an optimization of the seismic protection system with dampers is required. There are several configurations for placing the dampers that amplify the displacement and the damper axial force. This paper presents a computational mathematical model made for determining the coefficients of displacement multiplication and the damping force multiplication for two special positioning configurations of the

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Wang, Chenglong, Jiwei Zhang, Guoming Liu, Huan Shang, and Xueqian Wei. "Design and Performance Analysis of a Double-Outlet-Rod Magnetorheological Damper for Impact Load." Machines 10, no. 11 (2022): 1099. http://dx.doi.org/10.3390/machines10111099.

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In order to improve the performance of magnetorheological dampers under impact load, a double-rod magnetorheological damper is designed in this paper, and its multi-physical field coupling model is established. The performance of a double-rod magnetorheological damper under impact conditions is characterized from the aspects of viscosity, velocity, peak pressure, impact energy consumption and viscous damping force ratio. The research contents include: a comparison of dynamic characteristics such as the viscosity, velocity and pressure of the magnetorheological damper under impact conditions an

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Li, Ming, Ji Guang Chen, Wei Jian Zhao, and Li Guo Wang. "Force Behavior of Parallel Double Coupling Beams with Different Width." Applied Mechanics and Materials 578-579 (July 2014): 707–10. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.707.

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The force behavior of parallel double coupling beams (PDCB) with different width is analyzed, based on which the feasibility of this kind of beams is discussed. The loading process of the PDCB is simulated by using finite element software ABAQUS. By analyzing the hysteretic loops, skeleton curves, energy dissipation coefficient, equivalent viscous damping coefficient and ductility coefficient,the bearing capacity and seismic performance of the PDCB is studied. Through simulation, it shows that the hysteretic loops is plump, and the energy dissipation coefficient, equivalent viscous damping coe

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