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Vibro-acoustic Radiation Characteristics Analysis of Railway Vehicle Wheel with Damping Ridges Based on modal strain energy

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 1056-1067页

作者： HE Bin XIAO Xinbiao JIN Xuesong FANG Jianying State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China Knorr-Bremse Systems for Rail Vehicles（Suzhou） Co. Ltd Suzhou 215151 China

The existing researches on the damping wheel mainly focus on investigating the influence of damping structure change on the vibro-acoustic *** changes include the geometric size of the damping structure,the damping material parameters,and the placement,and so *** order to further understand the mechanism in reducing the acoustic radiation of railway wheel with layer damping treatment,in this paper,the wheel is simply modified by a full-sized circular *** circle plate side has stuck circumference constrained damping ridges and radial constrained damping ridges on *** on a hybrid finite element method-boundary element method（FEM-BEM）,the paper develops a vibro-acoustic radiation model for such a distributed constrained damping *** vibration and acoustic radiation of the circular plate is *** the analysis,the dynamic response of the system is obtained by using the 3D finite model superposition *** obtained vibration response is used as the initial boundary condition in solving Helmholtz boundary integral equation for the sound radiation *** the procedure,firstly,the modal analysis of the circular plate is performed to get the distribution of the system modal strain ***,the vibro-acoustic radiation characteristics of the plate with different kinds of circumference damping ridges and radial damping ridges are compared in order to try to find the best effective damping ridge ***,using the distribution of the plate modal strain energy investigates the effect of the ridge distribution locations on the circular plate on its vibro-acoustic *** calculation and analysis research results show that,the sticking circumference and radial damping ridges on the plate can control the vibro-acoustic radiation of the plate effectively in different frequency *** distribution of the constrained damping ridge has an effect on reduction in vibro-acoustic radiation of the circular *** presen

关键词： wheel/rail noise vibro-acoustic radiation circumference damping ridge radial damping ridge modal strain energy

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A Two-step Method for Structural Damage Identification Using Static Residual Force and modal strain energy 36

A Two-step Method for Structural Damage Identification Using...

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第36届中国控制会议

作者： Chen Yang Zixing Lu Institute of Solid Mechanics Beihang University

ISBN: (纸本)9781538629185

One of the main differences of each damage identification method is the different precision and cost in statics and *** we all known,static sampling system is more accurate,convenient and cheaper than *** with the advantages of simple in static damage identification and online in dynamics,a two-step damage identification methods combined with statics and dynamics become an important issue in *** study presents a two-step method based on static residual force and modal strain energy for structural damage *** the first step,the static residual force is used to select suspicious damage element,which are connected with the suspicious *** values of these nodes solved by static residual force are different from *** the static process,an index based on modal strain energy can be applied to quantify the damage levels in dynamic *** of structural dynamic sensitivity applied to calculate the damage level,the burden of matrix inversion can be avoided in this *** proposed method is verified with a truss numerical ***,the veracity and effectiveness of this study can be presented.

关键词： damage identification static residual force modal strain energy sensor samplings

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An Improved modal strain energy Method for Damage Detection in Offshore Platform Structures

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Journal of Marine Science and Application 2016年第2期15卷 182-192页

作者： Yingchao Li Shuqing Wang Min Zhang Chunmei Zheng College of Civil Engineering Ludong University Yantai 264025 China Department of Ocean Engineering Ocean University of China Qingdao 266100 China

The development of robust damage detection methods for offshore structures is crucial to prevent catastrophes caused by structural failures. In this research, we developed an Improved modal strain energy （IMSE） method for detecting damage in offshore platform structures based on a traditional modal strain energy method （the Stubbs index method）. The most significant difference from the Stubbs index method was the application of modal frequencies. The goal was to improve the robustness of the traditional method. To demonstrate the effectiveness and practicality of the proposed IMSE method, both numerical and experimental studies were conducted for different damage scenarios using a jacket platform structure. The results demonstrated the effectiveness of the IMSE method in damage location when only limited, spatially incomplete, and noise-polluted modal data is available. Comparative studies showed that the IMSE index outperformed the Stubbs index and exhibited stronger robustness, confirming the superiority of the proposed approach.

关键词： damage detection modal strain energy offshoreplatform structure modal frequency mode shape

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An efficient two-stage approach for structural damage detection using meta-heuristic algorithms and group method of data handling surrogate model

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Frontiers of Structural and Civil Engineering 2020年第4期14卷 907-929页

作者： Hamed FATHNEJAT Behrouz AHMADI-NEDUSHAN Department of Civil Engineering Yazd UniversityYazd 89195-741Iran

In this study,the performance of an efficient two-stage methodology which is applied in a damage detection system using a surrogate model of the structure has been *** the first stage,in order to locate the damage accurately,the performance of the modal strain energy based index for using different numbers of natural mode shapes has been evaluated using the confusion *** the second stage,to estimate the damage extent,the sensitivity of most used modal properties due to damage,such as natural frequency and flexibility matrix is compared with the mean normalized modal strain energy(MNMSE)of suspected damaged ***,a modal property change vector is evaluated using the group method of data handling(GMDH)network as a surrogate model during damage extent estimation by optimization algorithm;in this part of methodology,the performance of the three popular optimization algorithms including particle swarm optimization(PSO),bat algorithm(BA),and colliding bodies optimization(CBO)is examined and in this regard,root mean square deviation(RMSD)based on the modal property change vector has been proposed as an objective ***,the effect of noise in the measurement of structural responses by the sensors has also been ***,in order to achieve the most generalized neural network as a surrogate model,GMDH performance is compared with a properly trained cascade feed-forward neural network(CFNN)with log-sigmoid hidden layer transfer *** results indicate that the accuracy of damage extent estimation is acceptable in the case of integration of PSO and ***,the GMDH model is also more efficient and mimics the behavior of the structure slightly better than CFNN model.

关键词： two-stage method modal strain energy surrogate model GMDH optimization damage detection

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Passive vibration control of truss-cored sandwich plate with planar Kagome truss as one face plane

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Science China(Technological Sciences) 2011年第5期54卷 1113-1120页

作者： GUO Xu JIANG Jun MOE Key Laboratory of Strength and Vibration Xi'an Jiaotong University Xi'an 710049 China

Kagome based high authority shape morphing structure is a kind of truss-cored sandwich metal plate with a planar Kagome truss as one of its face plane. The planar Kagome truss can achieve arbitrary in-plane nodal displacements with minimal internal resistance when its rods are deformed. Moreover, the in-plane deflection of the planar Kagome truss may induce the lateral deflection of the whole sandwich plate. In this paper, the feasibility to enhance the damping of the truss-cored sandwich plate through the replacement of a very small portion of rods in the planar Kagome truss by cylindrical viscoelastic dampers is exploited. The Biot model is chosen to simulate the behavior of the viscoelastic material in the dampers, and the fraction of axial modal strain energy of the rods in the planar Kagome truss is adopted as the index to decide the positions of the dampers. Through complex modal analysis and time-domain simulation, it is shown that the passive vibration control approach is very effective for the vibration reduction of this kind of truss-cored sandwich plates.

关键词： truss-cored sandwich plate passive vibration control cylindrical viscoelastic damper modal strain energy

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Damage detection method in complicated beams with varying flexural stiffness

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Applied Mathematics and Mechanics(English Edition) 2011年第4期32卷 469-478页

作者：冯侃励争高桂云苏先樾 Department of Mechanics and Aerospace Engineering State Key Laboratory for Turbulence and Complex SystemsCollege of EngineeringPeking University

A damage detection method for complicated beam-like structures is proposed based on the subsection strain energy method （SSEM）, and its applicability condition is introduced. For a beam with the continuously varying fiexural stiffness and an edge crack, the SSEM is used to detect the crack location effectively by numerical modal shapes. As a complicated beam, the glass fiber-reinforced composite model of a wind turbine blade is studied based on an experimental modal analysis. The SSEM is used to calculate the damage index from the measured modal parameters and locate the damage position in the blade model successfully. The results indicate that the SSEM based on the modal shapes can be used to detect the damages in complicated beams or beam-like structures for engineering applications.

关键词： nondestructive testing modal strain energy varying flexural stiffness beam fiber reinforced composite material wind turbine blade

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Damage Localization of Offshore Platforms Under Ambient Excitation

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China Ocean Engineering 2003年第4期18卷 495-504页

作者：杨和振李华军王树青 College of Engineering Ocean University of China Qingdao 266071 China

In this paper Nondestructive Damage Detection (NDD) for offshore platforms is investigated under operational conditions. As is known, there is no easy way to measure ambient excitation, so damage detection methods based on ambient excitation have become very vital for the Structural Health Monitoring (SHM) of offshore platforms. The modal parameters (natural frequencies, damping ratios and mode shapes) are identified from structural response data with the Natural Excitation Technique (NExT) in conjunction with the Eigensystem Realization Algorithm (ERA) . A new method of damage detection is presented, which utilizes the invariance property of element modal strain energy. This method is to assign element modal strain energy to two parts, and defines two damage detection indicators. One is compression modal strain energy change ratio (CMSECR); the other is flexural modal strain energy change ratio (FMSECR). The present modal strain energy is obtained by incomplete modal shape and structural stiffness matr

关键词： offshore platform modal parameter identification damage detection modal strain energy

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