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Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 388-402 doi: 10.1007/s11465-016-0404-z

Abstract: This paper examines the distinctive modal properties of WTGs through finite element (FE) and experimentalmodal analyses.First, a whole system model is developed to investigate the first 10 modal frequencies and mode shapesSecond, the FE modal results are validated through experimental modal analyses of a 1.5 WM WTG usingThe natural frequencies from the FE and experimental modal analyses show favorable agreement and reveal

Keywords： wind turbine gearbox     modal analysis     finite element analysis     modal frequency     bearing equivalence    

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Experimental and computational validation of a scaled train tunnel model using modal analysis

Janice B. D’SOUZA, Sangarapillai KANAPATHIPILLAI

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4,   Pages 420-428 doi: 10.1007/s11465-013-0281-7

Abstract: The modal properties for the 300 Hz to 1500 Hz range, including resonances and mode shapes were identified

Keywords： reverberation time     acoustic environment     modal properties     resonances    

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Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1082-1094 doi: 10.1007/s11709-019-0537-3

Abstract: An out-put only modal parameter identification method based on variational mode decomposition (VMD) isdeveloped VMD technique is utilized to decompose the free decay response (FDR) of a structure into to modalA novel procedure is developed to calculate the instantaneous modal frequencies and instantaneous modalThe proposed identification method can straightforwardly extract the mode shape vectors using the modalparameter variation, and amplitude-dependent modal parameters, etc.

Keywords： modal parameter identification     variational mode decomposition     civil structure     nonlinear system     closely    

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Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration

Zhigen WU, Guohua LIU, Zihua ZHANG

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 112-120 doi: 10.1007/s11709-010-0069-3

Abstract: In addition, a new method was compared with the linear modal-based damage assessment using wavelet transformWith better sensibility of damage than modal parameters, probably DRAS is a promising damage indicator

Keywords： damage assessment     decay ratio of acceleration signals (DRAS)     wavelet transform (WT)     modal analysis     reinforced    

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network for damage detection in functionally graded carbon nanotube-reinforced composite plates using modal

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1453-1479 doi: 10.1007/s11709-021-0767-z

Abstract: The elemental modal kinetic energy (MKE) values, calculated from natural frequencies and translational

Keywords： deep feed-forward neural networks     functionally graded carbon nanotube-reinforced composite plates     modal    

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Control mode selection for modal control of long-span arch bridge

Zhengying LI, Zhengliang LI,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 4,   Pages 401-406 doi: 10.1007/s11709-009-0052-z

Abstract: seismic control of arch bridge, a model reduction of long-span arch bridge was implemented based on modalAs for the critical mode selection, an approach based on the maximum modal displacement was presentedseismic excitation and is more reasonable than only considering dynamic bridge characteristics based on a modalThe numerical results show that the method of maximal modal displacement better analyze long-span arch

Keywords： selection     reduced-order     excitation     long-span     simplified    

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Experimental study of modal parameter identification in a simulated ambient-excited structure

JI Xiaodong, QIAN Jiaru, XU Longhe

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 281-285 doi: 10.1007/s11709-007-0036-9

Abstract: Structure modal parameter online identification was used to monitor the structural health as evidencednatural excitation technique and the eigensystem realization algorithm were combined to identify the modalThe experimental modal analysis was performed on a two-story steel braced frame model excited by simulated

Keywords： eigensystem realization     eigen-sensitivity analysis     realization algorithm     vibration     effective    

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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: model for aero-damping in a uniform incoming flow, the three-dimension analytical algorithm of the modalAccording to the analytical equations, the modal aero-damping ratio for different nature frequenciesthe factors to affect the aero-damping can be determined.The first bend and the first torsion’s modal

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

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The Near β Forging Overthrows the Conventional Forging Theory and Develops a New Tri-modal Microstructure

Zhou Yigang,Zeng Weidong,Yu Hanqing

Strategic Study of CAE 2001, Volume 3, Issue 5,   Pages 61-66

Abstract: of microstructure in addition to the existing four titanium alloy microstructures (i.e. equiaxed, bi-modal

Keywords： titanium alloy     near beta forging     tri-modal microstructure    

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Robust cross-modal retrieval with alignment refurbishment Research Article

Jinyi GUO, Jieyu DING,jinyi_g@njust.edu.cn,djy@qdu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 10,   Pages 1403-1415 doi: 10.1631/FITEE.2200514

Abstract: tries to achieve mutual retrieval between modalities by establishing consistent alignment for different modalhave been proposed and have achieved excellent results; however, these are trained with clean cross-modal

Keywords： Cross-modal retrieval     Robust learning     Alignment correction     Beta-mixture model    

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Development Strategy for Air–Ground Collaborative Multi-Modal Intelligent Robot System

Huang Qiang, Meng Fei, Yu Zhangguo, Lin Defu, Xu Bin, Duo Yingxian

Strategic Study of CAE 2021, Volume 23, Issue 5,   Pages 116-121 doi: 10.15302/J-SSCAE-2021.05.015

Abstract:

An air–ground collaborative multi-modal intelligent robot systemConsidering the major demand for developing the air–ground collaborative multi-modal intelligentResearch shows that the air–ground collaborative multi-modal intelligent robot system can be integrated

Keywords： intelligent robot     air–ground collaboration     multi-modal     artificial intelligence    

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Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 446-472 doi: 10.1007/s11709-019-0605-8

Abstract: After the enhancements, modal frequencies are directly detected by the cross wavelet transform (XWT),

Keywords： ambient vibration test     high level noise     iterative signal enhancement     wavelet     cross and autocorrelation of wavelets    

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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 structural damage assessment. 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 research topics. Despite all the difficulties in the modeling of damping, there are some approaches like as linear and nonlinear models which are described as the energy dissipation throughout viscous, material or structural hysteretic and frictional damping mechanisms. In the presence of a mathematical model of the damping mechanisms, it is possible to estimate the damping ratio from the theoretical comparison of the damped and un-damped systems. On the other hand, solving the inverse problem of the input force estimation and its distribution to each SDOFs, from the measured structural responses plays an important role in structural identification process. In this paper model-based damping approximation method and a model-less structural input estimation are considered. The effectiveness of proposed methods has been carried out through analytical and numerical simulation of the lumped mass system and the results are compared with reference data. Consequently, high convergence of the comparison results illustrates the satisfactory of proposed approximation methods.

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

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Continuous dynamic monitoring of a centenary iron bridge for structural modification assessment

Carmelo GENTILE,Antonella SAISI

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 1,   Pages 26-41 doi: 10.1007/s11709-014-0284-4

Abstract: A multi-channel continuous dynamic monitoring system has been installed in a centenary iron arch bridge on late November 2011. The historic infrastructure, completed in 1889 and crossing the Adda river about 50 km far from Milan, is the most important monument of XIX century iron architecture in Italy and is still used as roadway and railway bridge. The monitoring project follows a series of preliminary ambient vibration tests carried out on the bridge since June 2009. The paper describes the bridge structure and its dynamic characteristics identified from the experimental studies developed since 2009, the installed monitoring system and the software developed in LabVIEW for automatically processing the collected data. Subsequently, the tracking of automatically identified natural frequencies over a period of about 18 months is presented and discussed, highlighting the effects of environmental and operational conditions on the bridge dynamic characteristics as well as the detection of structural changes, mainly based on natural frequencies shifts.

Keywords： automated modal identification     continuous dynamic monitoring     environmental/operational effects     iron arch    

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Parameter studies on impact in a lap joint

Amir M. RAHMANI,Elizabeth K. ERVIN

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1,   Pages 64-77 doi: 10.1007/s11465-014-0322-x

Abstract: Modal analysis with base excitation is solved, and time histories of contact points are closely monitored

Keywords： impact mechanics     contact     joint behaviour     modal analysis     parameter study    

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Title Author Date Type Operation

Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Journal Article

Experimental and computational validation of a scaled train tunnel model using modal analysis

Janice B. D’SOUZA, Sangarapillai KANAPATHIPILLAI

Journal Article

Variational mode decomposition based modal parameter identification in civil engineering

Mingjie ZHANG, Fuyou XU

Journal Article

Experimental study of structural damage identification based on modal parameters and decay ratio of acceleration

Zhigen WU, Guohua LIU, Zihua ZHANG

Journal Article

network for damage detection in functionally graded carbon nanotube-reinforced composite plates using modal

Journal Article

Control mode selection for modal control of long-span arch bridge

Zhengying LI, Zhengliang LI,

Journal Article

Experimental study of modal parameter identification in a simulated ambient-excited structure

JI Xiaodong, QIAN Jiaru, XU Longhe

Journal Article

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

Jun XING, Lin LI,

Journal Article

The Near β Forging Overthrows the Conventional Forging Theory and Develops a New Tri-modal Microstructure

Zhou Yigang,Zeng Weidong,Yu Hanqing

Journal Article

Robust cross-modal retrieval with alignment refurbishment

Jinyi GUO, Jieyu DING,jinyi_g@njust.edu.cn,djy@qdu.edu.cn

Journal Article

Development Strategy for Air–Ground Collaborative Multi-Modal Intelligent Robot System

Huang Qiang, Meng Fei, Yu Zhangguo, Lin Defu, Xu Bin, Duo Yingxian

Journal Article

Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Journal Article

Approximation of structural damping and input excitation force

Mohammad SALAVATI

Journal Article

Continuous dynamic monitoring of a centenary iron bridge for structural modification assessment

Carmelo GENTILE,Antonella SAISI

Journal Article

Parameter studies on impact in a lap joint

Amir M. RAHMANI,Elizabeth K. ERVIN

Journal Article