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Approximation of structural damping and input excitation force
Mohammad SALAVATI
《结构与土木工程前沿(英文)》 2017年 第11卷 第2期 页码 244-254 doi: 10.1007/s11709-016-0371-9
关键词: structural modal parameters damping identification method input excitation force identification Inverse problem
Variable stiffness and damping magnetorheological isolator
Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI
《机械工程前沿(英文)》 2009年 第4卷 第3期 页码 310-315 doi: 10.1007/s11465-009-0039-4
关键词: magnetorheological (MR) fluid stiffness damping mathematical model dynamic performance parameter identification
A method of analysis for modal aero-damping of vibrating blade in incompressible flow
Jun XING, Lin LI,
《能源前沿(英文)》 2009年 第3卷 第4期 页码 465-471 doi: 10.1007/s11708-009-0037-6
关键词: compressor different three-dimension analytical classical low-speed
Development of a seismic design method based on response spectra for building structures
ZHOU Xiyuan, YU Ruifang
《结构与土木工程前沿(英文)》 2007年 第1卷 第2期 页码 129-141 doi: 10.1007/s11709-007-0014-2
关键词: generalization classical damping mode-superposition response calculation formula damping theory
Dynamics of structural systems with various frequency-dependent damping models
Li LI,Yujin HU,Weiming DENG,Lei LÜ,Zhe DING
《机械工程前沿(英文)》 2015年 第10卷 第1期 页码 48-63 doi: 10.1007/s11465-015-0330-5
The aim of this paper is to present the dynamic analyses of the system involving various damping models. The assumed frequency-dependent damping forces depend on the past history of motion via convolution integrals over some damping kernel functions. By choosing suitable damping kernel functions of frequency-dependent damping model, it may be derived from the familiar viscoelastic materials. A brief review of literature on the choice of available damping models is presented. Both the mode superposition method and Fourier transform method are developed for calculating the dynamic response of the structural systems with various damping models. It is shown that in the case of non-deficient systems with various damping models, the modal analysis with repeated eigenvalues are very similar to the traditional modal analysis used in undamped or viscously damped systems. Also, based on the pseudo-force approach, we transform the original equations of motion with nonzero initial conditions into an equivalent one with zero initial conditions and therefore present a Fourier transform method for the dynamics of structural systems with various damping models. Finally, some case studies are used to show the application and effectiveness of the derived formulas.
关键词: damping viscoelasticity dynamic analysis mode superposition method Fourier transform method
Study of an artificial boundary condition based on the damping-solvent extraction method
Qiang XU, Jianyun CHEN, Jing LI, Mingming WANG
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 281-287 doi: 10.1007/s11709-012-0167-5
关键词: damping-solvent extraction method structure-unlimited-foundation system spring-damper system artificial damping limited region finite element method
Sunjoong Kim, Ho-Kyung Kim
《工程(英文)》 2017年 第3卷 第6期 页码 839-844 doi: 10.1016/j.eng.2017.11.002
Jing LU, Yu XIANG, Qiao NI
《机械工程前沿(英文)》 2011年 第6卷 第4期 页码 449-455 doi: 10.1007/s11465-011-0240-0
Considering the direct and converse piezoelectric effect, expressions of piezoelectric membrane internal forces in the piezoelectric constrained layer were given. The control equations of the piezoelectric constrained layer and host plate were obtained in according with the thin plate theory. Based on the layer wised principle, the integrated first order differential equation of an active constrained layer damping (ACLD) plate was derived for the simply supported boundary condition. Then, this method was expanded to the ACLD plate with cantilever boundary condition by virtue of geometric analogy method. Employing the extended homogeneous capacity precision integration approach, a high precision semi-analytical method was proposed to analyze the dynamic characteristics of the ACLD plate with various boundary conditions. The comparison with the literature results has verified the accuracy and effectiveness of the present method.
关键词: active constrained layer damping (ACLD) plate dynamic characteristics semi-analytical method extended homogeneous capacity precision integration approach
Wei GUO, Zhiwu YU
《结构与土木工程前沿(英文)》 2012年 第6卷 第4期 页码 379-384 doi: 10.1007/s11709-012-0180-8
关键词: isolated structure stochastic response non-proportional damping efficient accurate pseudo-excitation method
Non-convex sparse optimization-based impact force identification with limited vibration measurements
《机械工程前沿(英文)》 2023年 第18卷 第3期 doi: 10.1007/s11465-023-0762-2
关键词: impact force identification inverse problem sparse regularization under-determined condition alternating direction method of multipliers
HHT-based crack identification method for start-up rotor
Bing LI, Chunlin ZHANG, Zhengjia HE
《机械工程前沿(英文)》 2012年 第7卷 第3期 页码 300-304 doi: 10.1007/s11465-012-0328-1
This paper presents a crack identification method for start-up rotor based on the Hilbert-Huang transform (HHT). With this method, the instantaneous frequency (IF) of each intrinsic mode function is obtained through the Hilbert transform, and the spectrum of IF is calculated accordingly. The influence of acceleration and crack depth on the rotor is analyzed through experiments. HHT is employed to detect the shallower crack, and is then tested during the start-up process of the rotor. The results of the experiment show that HHT is a better tool for crack detection than fast Fourier transform.
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 851-866 doi: 10.1007/s11709-021-0739-3
关键词: damage identification beam-to-column connection time-domain response optimization
Time-domain and frequency-domain approaches to identification of bridge flutter derivatives
Zhengqing CHEN
《结构与土木工程前沿(英文)》 2009年 第3卷 第2期 页码 173-179 doi: 10.1007/s11709-009-0034-1
关键词: long-span bridges wind-induced vibration flutter derivatives forced vibration test time-domain method frequency-domain method
Shutian LIU,Quhao LI,Wenjiong CHEN,Liyong TONG,Gengdong CHENG
《机械工程前沿(英文)》 2015年 第10卷 第2期 页码 126-137 doi: 10.1007/s11465-015-0340-3
Additive manufacturing (AM) technologies, such as selective laser sintering (SLS) and fused deposition modeling (FDM), have become the powerful tools for direct manufacturing of complex parts. This breakthrough in manufacturing technology makes the fabrication of new geometrical features and multiple materials possible. Past researches on designs and design methods often focused on how to obtain desired functional performance of the structures or parts, specific manufacturing capabilities as well as manufacturing constraints of AM were neglected. However, the inherent constraints in AM processes should be taken into account in design process. In this paper, the enclosed voids, one type of manufacturing constraints of AM, are investigated. In mathematics, enclosed voids restriction expressed as the solid structure is simply-connected. We propose an equivalent description of simply-connected constraint for avoiding enclosed voids in structures, named as virtual temperature method (VTM). In this method, suppose that the voids in structure are filled with a virtual heating material with high heat conductivity and solid areas are filled with another virtual material with low heat conductivity. Once the enclosed voids exist in structure, the maximum temperature value of structure will be very high. Based upon this method, the simply-connected constraint is equivalent to maximum temperature constraint. And this method can be easily used to formulate the simply-connected constraint in topology optimization. The effectiveness of this description method is illustrated by several examples. Based upon topology optimization, an example of 3D cantilever beam is used to illustrate the trade-off between manufacturability and functionality. Moreover, the three optimized structures are fabricated by FDM technology to indicate further the necessity of considering the simply-connected constraint in design phase for AM.
关键词: additive manufacturing topology optimization manufacturability constraints design for additive manufacturing simply-connected constraint
Reza KHADEMI-ZAHEDI, Pouyan ALIMOURI
《结构与土木工程前沿(英文)》 2019年 第13卷 第4期 页码 965-980 doi: 10.1007/s11709-019-0530-x
关键词: operational modal analysis solar power plant structure multi-setup stochastic subspace bees optimization algorithm sensitivity analysis
标题 作者 时间 类型 操作
Variable stiffness and damping magnetorheological isolator
Yang ZHOU, Xingyu WANG, Xianzhou ZHANG, Weihua LI
期刊论文
A method of analysis for modal aero-damping of vibrating blade in incompressible flow
Jun XING, Lin LI,
期刊论文
Development of a seismic design method based on response spectra for building structures
ZHOU Xiyuan, YU Ruifang
期刊论文
Dynamics of structural systems with various frequency-dependent damping models
Li LI,Yujin HU,Weiming DENG,Lei LÜ,Zhe DING
期刊论文
Study of an artificial boundary condition based on the damping-solvent extraction method
Qiang XU, Jianyun CHEN, Jing LI, Mingming WANG
期刊论文
Dynamic characteristics analysis of active constrained layer damping plate with various boundary conditions
Jing LU, Yu XIANG, Qiao NI
期刊论文
Application of an efficient stochastic calculation method on the seismic analysis of an isolated structure
Wei GUO, Zhiwu YU
期刊论文
Non-convex sparse optimization-based impact force identification with limited vibration measurements
期刊论文
Damage identification in connections of moment frames using time domain responses and an optimizationmethod
期刊论文
Time-domain and frequency-domain approaches to identification of bridge flutter derivatives
Zhengqing CHEN
期刊论文
An identification method for enclosed voids restriction in manufacturability design for additive manufacturing
Shutian LIU,Quhao LI,Wenjiong CHEN,Liyong TONG,Gengdong CHENG
期刊论文