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

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: A novel damage assessment method based on the decay ratio of acceleration signals (DRAS) was proposedThe results clearly show that DRAS increases in linear elasticity state and microcrack propagation state, while DRAS decreases in macrocrack propagation state.analysis was developed considering the beat phenomenon in the nonlinear state to explain the turn point of DRASWith 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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A new type of quadratic acceleration method

Changqing LI, Menglin LOU,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 302-310 doi: 10.1007/s11709-010-0026-1

Abstract: The polynomial acceleration method for time history analysis is presented, in which accelerations betweenWhen stability field and computational accuracy are taken into account at the same time, the quadratic accelerationmethod is superior to linear and cubic acceleration methods in choosing the maximum acceptable timeIt is also shown that the quadratic acceleration method has desirable arithmetic damp, amplitude decay

Keywords： polynomial acceleration method     convergence     stability     square acceleration method    

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Position-varying surface roughness prediction method considering compensated acceleration in milling

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4,   Pages 855-867 doi: 10.1007/s11465-021-0649-z

Abstract: process, this paper proposes a position-varying surface roughness prediction method based on compensated accelerationThe actual vibration state at any processing position is obtained through the single-point monitoring accelerationSeven acceleration features are extracted, and valley, which has the highest R-square proving

Keywords： surface roughness prediction     compensated acceleration     milling     thin-walled workpiece    

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Design and characteristics of electric supercharger for diesel engine acceleration by additional rapid

YAO Chun-de, ZHOU Hong-xiu

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4,   Pages 409-412 doi: 10.1007/s11465-006-0048-5

Abstract: motor was developed to solve the problem of smoke caused by the turbocharger s sluggish response during accelerationTherefore, it is a feasible way to reduce smoke emission and improve the acceleration performance.

Keywords： acceleration     velocity distribution     high-speed brushless     turbocharger     electric supercharger    

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Characteristics of metal magnetic memory signals of different steels under static tension

Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2,   Pages 226-232 doi: 10.1007/s11465-010-0012-2

Abstract: To study the characteristics of metal magnetic memory (MMM) signals of different steels during tensileDuring the various deformation periods, MMM signals are tested, and micrometallographic is observed.statistical methods to study the macro and micro corresponding relationships and difference among magnetic signalslocation; there is a direct relationship between the intragranular slip and the changes of magnetic signals

Keywords： metal magnetic memory (MMM)     magnetic intensity (Hp)     static tension     weld    

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Gear fault diagnosis using gear meshing stiffness identified by gearbox housing vibration signals

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0713-3

Abstract: The gear meshing stiffness (GMS) identification approach is proposed by using housing vibration signals

Keywords： gearbox fault diagnosis     meshing stiffness     identification     transfer path     signal processing    

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One DOF mechanism for the mechanical harvest of vines in an arbor structure and the validation of the acceleration

Osvaldo PENISI,José BOCCA,Horacio AGUILAR,Pedro BOCCA

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 3,   Pages 221-232 doi: 10.1007/s11465-015-0347-9

Abstract: a system has been designed to measure the accelerations at the bars and the rocker to validate the accelerationvalues that detach the grape berries in a prototype in a lab experiment, to ensure that the acceleration

Keywords： harvest     mechanisms     one DOF     vibration    

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Unknown fault detection for EGT multi-temperature signals based on self-supervised feature learning and

Frontiers in Energy 2023, Volume 17, Issue 4,   Pages 527-544 doi: 10.1007/s11708-023-0880-x

Abstract: Intelligent power systems can improve operational efficiency by installing a large number of sensors. Data-based methods of supervised learning have gained popularity because of available Big Data and computing resources. However, the common paradigm of the loss function in supervised learning requires large amounts of labeled data and cannot process unlabeled data. The scarcity of fault data and a large amount of normal data in practical use pose great challenges to fault detection algorithms. Moreover, sensor data faults in power systems are dynamically changing and pose another challenge. Therefore, a fault detection method based on self-supervised feature learning was proposed to address the above two challenges. First, self-supervised learning was employed to extract features under various working conditions only using large amounts of normal data. The self-supervised representation learning uses a sequence-based Triplet Loss. The extracted features of large amounts of normal data are then fed into a unary classifier. The proposed method is validated on exhaust gas temperatures (EGTs) of a real-world 9F gas turbine with sudden, progressive, and hybrid faults. A comprehensive comparison study was also conducted with various feature extractors and unary classifiers. The results show that the proposed method can achieve a relatively high recall for all kinds of typical faults. The model can detect progressive faults very quickly and achieve improved results for comparison without feature extractors in terms of F1 score.

Keywords： fault detection     unary classification     self-supervised representation learning     multivariate nonlinear time series    

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Inverse Analysis and Design of the Rational Acceleration of Mine Winder Rope System

Peng Youduo,Liu Deshun,Zhu Pingyu,Zhang Yongzhong,Guo Yingfu

Strategic Study of CAE 2002, Volume 4, Issue 4,   Pages 64-68

Abstract:

The prompting acceleration of hoisting rope system determines the winderssitting comfort and the dynamiccomfort of hoisting cage and the little dynamic oscillation of hoisting rope as the aim, the rational acceleration

Keywords： hoisting rope system     prompting acceleration     ride comfort ableness     dynamic tensile force     inverse design    

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Fast removal of ocular artifacts from electroencephalogram signals using spatial constraint independent

Bang-hua YANG,Liang-fei HE,Lin LIN,Qian WANG

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 6,   Pages 486-496 doi: 10.1631/FITEE.1400299

Abstract: Ocular artifacts cause the main interfering signals within electroencephalogram (EEG) signal measurementsAn adaptive filter based on reference signals from an electrooculogram (EOG) can reduce ocular interference, but collecting EOG signals during a long-term EEG recording is inconvenient and uncomfortable for theThen the RLS based adaptive filter uses SC-ICs as reference signals to reduce interference, which avoids

Keywords： Ocular artifacts     Electroencephalogram (EEG)     Electrooculogram (EOG)     Brain-computer interface (BCI)     Spatial constraint independent component analysis based recursive least squares (SCICA-RLS)    

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Identification of faults through wavelet transform vis-à-vis fast Fourier transform of noisy vibration signals

Deepak PALIWAL,Achintya CHOUDHURY,T. GOVANDHAN

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2,   Pages 130-141 doi: 10.1007/s11465-014-0298-6

Abstract: envelope detection with fast Fourier transform (FFT) and continuous wavelet transform (CWT) of vibration signalsBoth simulated and experimental signals from identical bearings have been considered for the purposeThe bearings have been modeled as spring-mass-dashpot systems and the simulated signals have been obtainedCWT with the proposed wavelets overcomes the short coming of FFT while processing a noisy vibration signals

Keywords： Fault detection     spline wavelet     continuous wavelet transform     fast Fourier transform    

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Dynamic characteristics of NC table with SVD

WANG Linhong, WU Bo, DU Runsheng, YANG Shuzi

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 385-391 doi: 10.1007/s11465-008-0052-z

Abstract: Acceleration signals of the NC table at three directions are tested; the singular spectrum of the signalsis acquired with SVD; principal components of the signals are found out; dynamic characteristics ofthe signals and their contributing factors are studied by extracting dynamic characteristics of principalcomponents; and signals and principal components are quantitatively analyzed by calculating signal energyHowever, signals perpendicular to each other in terms of the motion direction at the horizontal level

Keywords： Acceleration     vibration source     chaotic     energy     dynamic    

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A Precision-Positioning Method for a High-Acceleration Low-Load Mechanism Based on Optimal Spatial and Article

Xin Chen,Youdun Bai,Zhijun Yang,Jian Gao,Gongfa Chen

Engineering 2015, Volume 1, Issue 3,   Pages 391-398 doi: 10.15302/J-ENG-2015063

Abstract:

High-speed and precision positioning are fundamental requirements for high-acceleration low-load mechanismsIn this paper, we derive the transient nonlinear dynamicresponse equations of high-acceleration mechanismsa new structural optimization and velocity-planning method for the precision positioning of a high-accelerationOur method was verified on a high-acceleration die bonder.This method provides an effective theoretical support for the precision positioning of high-acceleration

Keywords： high-acceleration low-load mechanism     precision positioning     spatial and temporal distribution     inertial    

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Influence of core stiffness on the behavior of tall timber buildings subjected to wind loads

Zhouyan XIA, Jan-Willem G. VAN DE KUILEN, Andrea POLASTRI, Ario CECCOTTI, Minjuan HE

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 213-226 doi: 10.1007/s11709-021-0692-1

Abstract: However, the acceleration at the building top still exceeded the limitation prescribed in Chinese CodeTo restrict this top acceleration within the limit, further approaches to increase the stiffness in the

Keywords： cross-laminated timber     tall timber buildings     finite element analysis     horizontal deflection     top acceleration    

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Multi-axle dynamic steering system of truck-howitzer

LI Yanliang, GAO Xiuhua, ZHANG Chunqiu, SUN Yubo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1,   Pages 44-49 doi: 10.1007/s11465-008-0002-9

Abstract: Under this control, the steady value of the lateral acceleration is obviously diminished and the yaw

Keywords： multi-axle     acceleration     relationship     smoothly     handling stability    

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Title Author Date Type Operation

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

Zhigen WU, Guohua LIU, Zihua ZHANG

Journal Article

A new type of quadratic acceleration method

Changqing LI, Menglin LOU,

Journal Article

Position-varying surface roughness prediction method considering compensated acceleration in milling

Journal Article

Design and characteristics of electric supercharger for diesel engine acceleration by additional rapid

YAO Chun-de, ZHOU Hong-xiu

Journal Article

Characteristics of metal magnetic memory signals of different steels under static tension

Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,

Journal Article

Gear fault diagnosis using gear meshing stiffness identified by gearbox housing vibration signals

Journal Article

One DOF mechanism for the mechanical harvest of vines in an arbor structure and the validation of the acceleration

Osvaldo PENISI,José BOCCA,Horacio AGUILAR,Pedro BOCCA

Journal Article

Unknown fault detection for EGT multi-temperature signals based on self-supervised feature learning and

Journal Article

Inverse Analysis and Design of the Rational Acceleration of Mine Winder Rope System

Peng Youduo,Liu Deshun,Zhu Pingyu,Zhang Yongzhong,Guo Yingfu

Journal Article

Fast removal of ocular artifacts from electroencephalogram signals using spatial constraint independent

Bang-hua YANG,Liang-fei HE,Lin LIN,Qian WANG

Journal Article

Identification of faults through wavelet transform vis-à-vis fast Fourier transform of noisy vibration signals

Deepak PALIWAL,Achintya CHOUDHURY,T. GOVANDHAN

Journal Article

Dynamic characteristics of NC table with SVD

WANG Linhong, WU Bo, DU Runsheng, YANG Shuzi

Journal Article

A Precision-Positioning Method for a High-Acceleration Low-Load Mechanism Based on Optimal Spatial and

Xin Chen,Youdun Bai,Zhijun Yang,Jian Gao,Gongfa Chen

Journal Article

Influence of core stiffness on the behavior of tall timber buildings subjected to wind loads

Zhouyan XIA, Jan-Willem G. VAN DE KUILEN, Andrea POLASTRI, Ario CECCOTTI, Minjuan HE

Journal Article

Multi-axle dynamic steering system of truck-howitzer

LI Yanliang, GAO Xiuhua, ZHANG Chunqiu, SUN Yubo

Journal Article