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Study on Semi-active Control of Multi-dim Damping Platform Based on Parallel Mechanism and MR Damper

Zhu Wei,Ma Lüzhong,Chen Xiuxiang,Wu Weiguang,Xie Jun

Strategic Study of CAE 2007, Volume 9, Issue 11, Pages 63-67

Abstract: style="text-align: justify;">MR damper is analyzed on its mechanical characteristic, and is applied in multi-dimensiondamping in this paper. A kind of three-translation parallel mechanism is used as main mechanism of multi-dim damping,

Keywords： parallel mechanism multi-dim damping MR damper semi-active control

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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-stabilizingand en-stabilizing property multi-time scale power system stabilizer

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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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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.The complexity of structural damping mechanisms has made this parameter to be one of the ongoing researchDespite 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 are

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

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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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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

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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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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:

The aim of this paper is to present the dynamic analyses of the system involving various damping modelsover some damping kernel functions.By choosing suitable damping kernel functions of frequency-dependent damping model, it may be derivedA brief review of literature on the choice of available damping models is presented.It is shown that in the case of non-deficient systems with various damping models, the modal analysis

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

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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.combination with three components (CCQC3) method, which is a generalization of the CCQC method to the case of multi-componentsapproach 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: The 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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Clinical significance of CD34⁺CD117^dim/CD34⁺CD117^bri myeloblast-associated

Xueping Li, Yuting Dai, Bing Chen, Jinyan Huang, Saijuan Chen, Lu Jiang

Frontiers of Medicine 2021, Volume 15, Issue 4, Pages 608-620 doi: 10.1007/s11684-021-0836-7

Abstract: t(8;21)(q22;q22) acute myeloid leukemia (AML) is a highly heterogeneous hematological malignancy with a high relapse rate in China. Two leukemic myeloblast populations (CD34 CD117 and CD34 CD117 ) were previously identified in t(8;21) AML, and CD34 CD117 cell proportion was determined as an independent factor for this disease outcome. Here, we examined the impact of CD34 CD117 /CD34 CD117 myeloblast-associated gene expression on t(8;21) AML clinical prognosis. In this study, 85 patients with t(8;21) AML were enrolled. The mRNA expression levels of CD34 CD117 -associated genes ( , , and ) and CD34 CD117 -associated genes ( , , and ) were measured using quantitative reverse transcription PCR. Associations between gene expression and clinical outcomes were determined using Cox regression models. Results showed that patients with high , , or expression had significantly inferior overall survival (OS), whereas those with high or expression showed relatively favorable prognosis. Univariate analysis revealed that CD19, CD34 CD117 proportion, mutation, minimal residual disease (MRD), and expression levels of , , , and were associated with OS. Multivariate analysis indicated that mutation, MRD and and expression levels were independent prognostic variables for OS. Identifying the clinical relevance of CD34 CD117 /CD34 CD117 myeloblast-associated gene expression may provide new clinically prognostic markers for t(8;21) AML.

Keywords： t(8 21)(q22 q22) AML CD34⁺CD117^dim/ CD34⁺CD117^bri cell population