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Multi-time scale dynamics in power electronics-dominated power systems

Xiaoming YUAN, Jiabing HU, Shijie CHENG

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3, Pages 303-311 doi: 10.1007/s11465-017-0428-z

Abstract:

Electric power infrastructure has recently undergone a comprehensive transformation from electromagnetics to semiconductors. Such a development is attributed to the rapid growth of power electronic converter applications in the load side to realize energy conservation and on the supply side for renewable generations and power transmissions using high voltage direct current transmission. This transformation has altered the fundamental mechanism of power system dynamics, which demands the establishment of a new theory for power system control and protection. This paper presents thoughts on a theoretical framework for the coming semiconducting power systems.

Keywords： power electronics power systems multi-time scale dynamics mass-spring-damping model self-stabilizing

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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.An artificial boundary condition was then established by setting two spring-damper systems and one artificialdamping limited region.A test example was developed to verify that the proposed boundary condition and model had high precision

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

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Dynamic modeling of hydrostatic guideway considering compressibility and inertia effect

Yikang DU,Kuanmin MAO,Yaming ZHU,Fengyun WANG,Xiaobo MAO,Bin LI

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1, Pages 78-88 doi: 10.1007/s11465-015-0331-4

Abstract: Hydrostatic guideways are used as an alternative to contact bearings due to high stiffness and high dampingThis paper presents a “mass-spring-Maxwell” model considering the effects of inertia, squeezeBased on a dynamic model and numerical simulation, every dynamic model’s parameters are calculatedIdentification results show that “mass-spring-damper” model is the most appropriate dynamicmodel of the hydrostatic guidway.

Keywords： hydrostatic guidway dynamic model dynamic mesh technique Levenberg-Marquardt mass-spring-damper model

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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 dampingThe parameters of the model under various magnetic fields are identified, and the dynamic performanceExperimental 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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Analytical study on damping performances of magnetorheological grease damper based on disk squeeze mode

Danxia ZHAO, Changrong LIAO, Qiong LIU, Jing LUO

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 312-317 doi: 10.1007/s11465-011-0235-x

Abstract: The experimental damping force from MTS870 Electro-hydraulic Servo with sine wave excitation shows that

Keywords： magnetorheological grease (MRG) damper squeeze model

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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: Based 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 nonlineardamping is found to be incorrect.To correct this error, a more accurate approximating formula for the damping constant is theoreticallyAt the same time, a modified Kelvin impact model, which can reasonably account for the physical nature

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

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Study on the Oscillation of a Uniform Cylinder in Front of Two Vertical Walls Intersecting Normally

Ning Dezhi,Teng Bin

Strategic Study of CAE 2003, Volume 5, Issue 5, Pages 84-91

Abstract: examine the influence of the distances between the cylinder and the walls and water depth on the added massand radiation damping of the cylinder.The calculation shows that the added mass and radiation damping of the cylinder in front of the two verticalThe added mass and radiation damping oscillate with wave number, and the oscillating frequency increasesFurthermore, the added masses and radiation damping are linear with the water depth in the range of low

Keywords： added mass radiation damping image theory vertical wall cylinder

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Endochronic damage constitutive model for fully-graded aggregate mass concrete

SONG Yupu, WANG Huailiang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3, Pages 274-280 doi: 10.1007/s11709-007-0035-x

Abstract: aggregate concrete under complex stress state is the basis of the nonlinear analysis and design for masswith damage mechanics and on the quantities of experimental data, an endochronic damage constitutive modelThis model takes into consideration the scale effect and the effect of wet screen sieve of aggregateThe proposed model is used to analyze the deformation and strength of fully-graded aggregate mass concreteagreement with experimental data, which can be used as a guide for the design of arch dams and other mass

Keywords： concept surface design concern strength

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Vibration suppression of speed-controlled robots with nonlinear control

Paolo BOSCARIOL,Alessandro GASPARETTO

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 2, Pages 204-212 doi: 10.1007/s11465-016-0380-3

Abstract: this paper, a simple nonlinear control strategy for the simultaneous position tracking and vibration damping

Keywords： industrial robot nonlinear control vibration damping model-free control motion control

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Analysis and characterization of wind-solar-constant torque spring hybridized model

Shantanu ACHARYA,Subhadeep BHATTACHARJEE

Frontiers in Energy 2014, Volume 8, Issue 3, Pages 279-289 doi: 10.1007/s11708-014-0312-z

Abstract: This paper presents a model of wind and solar thermal hybrid power plant with a spring storage systemturbine, solar energy is utilized by a Stirling engine, and the surplus energy is stored in a winding springdiscusses the working methodologies and analyses the performance of such 2.6 kW hybrid power plant model

Keywords： hybrid vertical axis wind turbine Stirling engine solar-thermal energy wind energy constant torque spring

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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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Back to the spring of Wuhan: facts and hope of COVID-19 outbreak

Guangbiao Zhou, Saijuan Chen, Zhu Chen

Frontiers of Medicine 2020, Volume 14, Issue 2, Pages 113-116 doi: 10.1007/s11684-020-0758-9

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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: The more sensitive parameter to the damage is the damping behavior of the structure.Despite all the difficulties in the modeling of damping, there are some approaches like as linear andIn 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 areof proposed methods has been carried out through analytical and numerical simulation of the lumped mass

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

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Static balancing of planar articulated robots

Giuseppe QUAGLIA,Zhe YIN

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4, Pages 326-343 doi: 10.1007/s11465-015-0355-9

Abstract: aspects: One is the optimization for the position of the balancing system; the other is the design of the spring

Keywords： robotics static balancing pneumatic spring mechanical spring torque compensation

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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: To 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 reduces

Keywords： green infrastructure green roof structural resilience seismic design