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Approximation of structural damping and input excitation force

Mohammad SALAVATI

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2, Pages 244-254 doi: 10.1007/s11709-016-0371-9

Abstract: Structural dynamic characteristics are the most significant parameters that play a decisive role in structuralThe complexity of structural damping mechanisms has made this parameter to be one of the ongoing researchhysteretic and frictional damping mechanisms.In the presence of a mathematical model of the damping mechanisms, it is possible to estimate the dampingIn this paper model-based damping approximation method and a model-less structural input estimation are

Keywords： structural modal parameters damping identification method input excitation force identification Inverse

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Effects of green roof damping and configuration on structural seismic response

Frontiers of Structural and Civil Engineering Pages 1133-1144 doi: 10.1007/s11709-023-0959-9

Abstract: Hence, their structural resilience or ability to recover from natural events must be considered comprehensivelyTo expand their usage, their inherent damping and layout sensitivity to seismic performance are investigatedResults of preliminary analysis show that a green roof soil can increase localized damping by 2.5% underThe increased damping in the green roof soil is beneficial to the structural performance, i.e., it reducesAdditionally, certain configurations are more effective and beneficial to the structural response than

Keywords： green infrastructure green roof structural resilience seismic design

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Dynamics of structural systems with various frequency-dependent damping models

Li LI,Yujin HU,Weiming DENG,Lei LÜ,Zhe DING

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1, Pages 48-63 doi: 10.1007/s11465-015-0330-5

Abstract: over some damping kernel functions.By choosing suitable damping kernel functions of frequency-dependent damping model, it may be derivedsuperposition method and Fourier transform method are developed for calculating the dynamic response of the structuralsystems with various damping models.one with zero initial conditions and therefore present a Fourier transform method for the dynamics of structural

Keywords： damping viscoelasticity dynamic analysis mode superposition method Fourier transform method

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A novel structural modification to eliminate the early coupling between bending and torsional mode shapes

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2, Pages 131-142 doi: 10.1007/s11709-016-0376-4

Abstract: In this paper, a novel structural modification approach has been adopted to eliminate the early couplingto obtain the natural frequencies of the first eight mode shapes of vibrations before and after the structuralthe deck to analyze both the bending and the torsional stiffness of the system before and after the structuralThe novel structural approach manifested great efficiency in increasing vertical and torsional stiffness

Keywords： aeroelastic instability structural damping flutter wind speed bending stiffness torsional stiffness

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Impact analytical models for earthquake-induced pounding simulation

Kun YE, Li LI

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2, Pages 142-147 doi: 10.1007/s11709-009-0029-y

Abstract: Structural pounding under earthquake has been recently extensively investigated using various impactBased on this review, the formula used to determine the damping constant related to the impact springstiffness, coefficient of restitution, and relative approaching velocity in the Hertz model with nonlinear dampingTo correct this error, a more accurate approximating formula for the damping constant is theoreticallyphysical nature of pounding and conveniently implemented in the earthquake-induced pounding simulation of structural

Keywords： structural pounding Hertz model Kelvin model nonlinear damping coefficient of restitution

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Development of rocking constraint device with vertical damping capacity for three-dimensional base-isolated

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 3, Pages 350-367 doi: 10.1007/s11709-022-0923-0

Abstract: 3D) base-isolated frame structures by connecting a custom-designed cylinder pair to provide vertical dampingwith replaceable damping components installed outside the cylinders when the superstructure undergoesTheoretical formulas for calculating the damping and rocking constraint stiffness of the RCD are proposedThe test results show that the cylinder without orifices on its piston can provide the desired dampingwith a replaceable damping component, and that the RCD can effectively suppress rocking.

Keywords： three-dimensional isolation rocking behavior rocking constraint device replaceable damping component

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Variable stiffness and damping magnetorheological isolator

Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3, Pages 310-315 doi: 10.1007/s11465-009-0039-4

Abstract: the development and characterization of a magnetorheological (MR) fluid-based variable stiffness and dampingExperimental results indicate that both the stiffness and damping capability of the developed MR isolator

Keywords： magnetorheological (MR) fluid stiffness damping mathematical model dynamic performance parameter identification

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Study of an artificial boundary condition based on the damping-solvent extraction method

Qiang XU, Jianyun CHEN, Jing LI, Mingming WANG

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3, Pages 281-287 doi: 10.1007/s11709-012-0167-5

Abstract: The boundary condition was based on the damping-solvent extraction method.The principle of the damping-solvent extraction method was described.artificial boundary condition was then established by setting two spring-damper systems and one artificial dampingCompared with the damping-solvent extraction method, this boundary condition is easier to be applied

Keywords： damping-solvent extraction method structure-unlimited-foundation system spring-damper system artificialdamping limited region finite element method

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Fluid damping clearance in a control valve of injector

ZHANG Jianming, ZHANG Weigang, YANG Bing, WANG Yawei

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4, Pages 439-441 doi: 10.1007/s11465-007-0075-x

Abstract: A force model of a control valve of injector is set up, and the changes of the fluid damping clearanceResults indicate that a damping clearance of 0.02–0.03 mm between the poppet and the valve guide is the

Keywords： control computational bouncing CFD excessive control

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A method of analysis for modal aero-damping of vibrating blade in incompressible flow

Jun XING, Lin LI,

Frontiers in Energy 2009, Volume 3, Issue 4, Pages 465-471 doi: 10.1007/s11708-009-0037-6

Abstract: By establishing a research model for aero-damping in a uniform incoming flow, the three-dimension analyticalalgorithm of the modal aero-damping based on the equivalent viscous damping principle was establishedThe algorithm, which is suited for low-speed flow, to compute aero-damping is based on classical liftAccording to the analytical equations, the modal aero-damping ratio for different nature frequenciesThe results show that the aero-damping cannot be neglected comparing with the structure damping.

Keywords： compressor different three-dimension analytical classical low-speed

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Development of a seismic design method based on response spectra for building structures

ZHOU Xiyuan, YU Ruifang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2, Pages 129-141 doi: 10.1007/s11709-007-0014-2

Abstract: The scope of application for the classical damping theory is analyzed and the necessity of the researchon mode-superposition method for non-classical damping is presented.approach for calculation of seismic response of the non-classically damped system with overcritical damping

Keywords： generalization classical damping mode-superposition response calculation formula damping theory

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Dynamic characteristics analysis of active constrained layer damping plate with various boundary conditions

Jing LU, Yu XIANG, Qiao NI

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 4, Pages 449-455 doi: 10.1007/s11465-011-0240-0

Abstract: layer wised principle, the integrated first order differential equation of an active constrained layer damping

Keywords： active constrained layer damping (ACLD) plate dynamic characteristics semi-analytical method extended

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Design of damping valve for vehicle hydro pneumatic suspension

DONG Mingming, HUANG Hua, GU Lian

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1, Pages 97-100 doi: 10.1007/s11465-008-0014-5

Abstract: According to the design features of a hydro pneumatic spring, the necessity of a separate damping valveBased on a 1/4 vehicle linear suspension model, the optimum damping coefficient is worked out and theparameters of the damping valve are determined with the equivalent linearization method.A practical structure of the damping valve is proposed having a small size, high flowrate when the valveBased on bench tests, the damping valve has been found to properly work and be suitable.

Keywords： ability pneumatic necessity flowrate equivalent linearization

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Study on damping properties of magnetorheological damper

ZHOU Yu-feng, CHEN Hua-ling

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4, Pages 452-455 doi: 10.1007/s11465-006-0057-4

Abstract: On the basis of analyzing the structural forms of MR dampers, an improved structure of the MR damperThe experimental results reveal that the Herschel-Bulkley model predicts the force-velocity well; the dampingexcitation is a sinusoidal signal, the MR damper reveals a nonlinear hysteretic property between the damping

Keywords： nonlinear hysteretic force-velocity unsolved excitation magnetorheological

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Vibration control efficiency of piezoelectric shunt damping system

Dan WU, Zhichun YANG, Hao SUN,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 441-446 doi: 10.1007/s11465-009-0055-4

Abstract: The piezoelectric shunt damping technique based on the direct piezoelectric effect has been known asa simple, low-lost, lightweight, and easy to implement method for passive damping control of structuralWhen applying the piezoelectric shunt damping technique to passively control structural vibration, theIn this paper, the concept of vibration control efficiency of a piezoelectric shunt damping system isIt comes to a conclusion that the vibration control efficiency of the piezoelectric shunt damping system

Keywords： piezoelectric shunt vibration control efficiency clamped plate generalized electromechanical coupling coefficient