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Journal articles on the topic 'Dynamic damage'

Author: Grafiati

Published: 7 July 2024

Last updated: 19 July 2025

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1

Bhargav Sai, Cherukuri, and D. Mallikarjuna Reddy. "Dynamic Analysis of Faulty Rotors through Signal Processing." Applied Mechanics and Materials 852 (September 2016): 602–6. http://dx.doi.org/10.4028/www.scientific.net/amm.852.602.

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In this study, an effective method based on wavelet transform, for identification of damage on rotating shafts is proposed. The nodal displacement data of damaged rotor is processed to obtain wavelet coefficients to detect, localise and quantify damage severity. Because the wavelet coefficients are calculated with various scaled indices, local disturbances in the mode shape data can be found out in the finer scales that are positioned at local disturbances. In the present work the displacement data are extracted from the MATLAB model at a particular speed. Damage is represented as reduction in

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2

Sun , Yun, Qiuwei Yang, and Xi Peng. "Structural Damage Assessment Using Multiple-Stage Dynamic Flexibility Analysis." Aerospace 9, no. 6 (2022): 295. http://dx.doi.org/10.3390/aerospace9060295.

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Vibration-based damage assessment technology is a hot topic in aerospace engineering, civil engineering, and mechanical engineering. In this paper, a damage assessment approach using multiple-stage dynamic flexibility analysis is proposed for structural safety monitoring. The proposed method consists of three stages. The content of Stage I is to determine the number of damaged elements in the structure by the rank of dynamic flexibility change. The content of Stage II is to determine damage locations by the minimum rank of flexibility correlation matrices. Finally, the damage extents of those

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3

Mahendran, G., Chandrasekaran Kesavan, and S. K. Malhotra. "Damage Detection in Laminated Composite Beams, Plates and Shells Using Dynamic Analysis." Applied Mechanics and Materials 787 (August 2015): 901–6. http://dx.doi.org/10.4028/www.scientific.net/amm.787.901.

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Vibration-based technique to detect damage in laminated composite beams, rectangular plates and cylindrical shells is presented in this paper.A parameter called damage indicator calculated based on mode shape curvature isused in this studyto detect the location and size of small damages accurately in laminated composite structures. Through numerical analysis of laminated compositecantilevered beam, plate and cylindrical shell models with edge crack as damage, the absolute change inthe damage indicator is localized in the region of damage. Thechange in damage indicatorincreases withincreasing s

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LI, S. C., S. H. LIU, and Y. L. WU. "A NEW TYPE OF CAVITATION DAMAGE TRIGGERED BY BOUNDARY-LAYER TURBULENT PRODUCTION." Modern Physics Letters B 21, no. 20 (2007): 1285–96. http://dx.doi.org/10.1142/s0217984907013456.

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A new type of cavitation damage has been observed on the turbines installed at the Three Gorges Power Station despite no cavitation detected during model tests. Metallurgical and fluid dynamic analysis suggests that this cavitation is triggered by boundary-layer turbulent production; the damaged (roughened) spot in turn triggers subsequent cavitation (damage) immediately down stream. This forms a sustainable dynamic process, resulting in long and equal-width streamwise damage-strips with spanwise regularity reflecting the spanwise stochastic characteristics of turbulent production. Owing to th

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SILVA, R. L., L. M. TRAUTWEIN, C. S. BARBOSA, L. C. ALMEIDA, and G. H. SIQUEIRA. "Empirical method for structural damage location using dynamic analysis." Revista IBRACON de Estruturas e Materiais 13, no. 1 (2020): 19–31. http://dx.doi.org/10.1590/s1983-41952020000100003.

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Abstract This paper presents the use of numerical model techniques for identification and damage location adopting the Modal Curvature Difference (MCD) method as reference for the analysis of a simply supported concrete structure. Then, an empirical formulation to detect damages in this structure is proposed. In this method, called Acceleration Summation Difference (ASD), the difference of acceleration amplitude between intact and damaged structures are calculated for concrete plates simply supported on rubber bearings. During the analyses, the finite element models were developed using SAP200

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Zhao, Mingjie, Guoyin Wu, and Kui Wang. "Comparative Analysis of Dynamic Response of Damaged Wharf Frame Structure under the Combined Action of Ship Collision Load and Other Static Loads." Buildings 12, no. 8 (2022): 1131. http://dx.doi.org/10.3390/buildings12081131.

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In the long-term service, the wharf structure can be damaged by ship impact, wave load, and even earthquake, which will affect the safe production and smooth operation of the port. Based on the theory of structural dynamic response analysis and wavelet packet analysis principle, this paper established the damage identification index of the wharf frame structure. Combining with the finite element method and the dynamic response theory of the wharf frame structure, it set up a finite element analysis model of the dynamic response of the wharf frame structure under the action of multiple loads, w

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7

ZHANG, Hougui, Ruixiang SONG, Jie YANG, Dan WU, and Yingjie WANG. "Connection Damage Detection of Double Beam System under Moving Load with Genetic Algorithm." Mechanics 27, no. 1 (2021): 80–87. http://dx.doi.org/10.5755/j02.mech.25500.

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In this paper, a novel damage detection approach for the spring connection of the double beam system using the dynamic response of the beam and genetic algorithm is presented. The double beam system is regarded as both Bernoulli-Euler beams with simply supported ends, the upper and lower beams are connected by a series of linear springs with certain intervals. With the genetic algorithm, the dynamic acceleration response of double beam system under moving load, which can be solved by the Newmark-β integration procedure, is used as the input data to detect the connection damage. Thus the dynami

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8

Capozucca, R., E. Magagnini, and M. V. Vecchietti. "Experimental Free Vibration of Damaged RC Beam Models." Key Engineering Materials 827 (December 2019): 499–504. http://dx.doi.org/10.4028/www.scientific.net/kem.827.499.

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Reinforced Concrete (RC) Beam undamaged and damaged were investigated by free vibration to obtain a variation of frequency values at different degree of damage. Experimental tests were carried out on RC beams in scale and in real scale. The damage of RC beams in real scale was obtained by cracking under static bending tests, while in the case of beam in scale is obtained by notches on the concrete cover with different width. In general, the effects on the dynamic response of diffused damages and of concentrated damages on a section of beam have been experimentally analyzed. The envelope of fre

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9

Carminati, M., and S. Ricci. "Structural Damage Detection Using Nonlinear Vibrations." International Journal of Aerospace Engineering 2018 (September 25, 2018): 1–21. http://dx.doi.org/10.1155/2018/1901362.

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Nonlinear vibrations emerging from damaged structures are suitable indicators for detecting defects. When a crack arises, its behavior could be approximated like a bilinear stiffness. According to this scheme, typical nonlinear phenomena as the presence of superharmonics in the dynamic response and the variation of the oscillation frequency in time emerge. These physical consequences give the opportunity to study damage detection procedures with relevant improvements with respect to the typical strategies based on linear vibrations, such as high sensitivity to small damages, no need for an acc

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10

Wang, Feng, Haibo Wang, Ying Xu, Bing Cheng, and Qianqian Wang. "Analysis of Energy Dissipation Characteristics of Damaged Sandstone under Impact Load." Shock and Vibration 2021 (July 22, 2021): 1–10. http://dx.doi.org/10.1155/2021/4200452.

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Before rock burst, coal, and gas outburst dynamic load, rock mass in geotechnical engineering has been an indifferent degree of damage. The dissipation energy of rock mass under dynamic load reflects the difficulty of rock breaking. In view of the energy dissipation of damaged rock mass under dynamic load, the cyclic loading and unloading test is carried out to make sandstone in different damage states, and the damage degree of sandstone is characterized by the change of longitudinal wave velocity before and after cyclic loading and unloading. Then, the rock with different damage degrees is te

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11

Dimri, Akshat, and Sushanta Chakraborty. "Experimental Investigation on Damage Sensitive Dynamic Responses of a Reinforced Concrete Beam." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (2022): 1019–23. http://dx.doi.org/10.38208/acp.v1.615.

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Reinforced concrete structures are subjected to damage due to environmental loading and operational conditions. Early detection of damages in reinforced concrete structures is very important. However, this becomes difficult because failure at the micro level in the form of minute cracks, develops much earlier than the visual appearance of actual damages resulting out of coalesce of several such micro level damages. Vibration based damage detection techniques, particularly use of modal testing by exciting a structure dynamically and measuring resulting responses is well established in current p

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Pattavanitch, Jitti, Puttha Jeenkour, and Kittipong Boonlong. "Cooperative Coevolution with Dynamic Species-Size Strategy for Vibration-Based Damage Detection in Plates." International Journal of Advanced Research in Engineering 3, no. 3 (2017): 12. http://dx.doi.org/10.24178/ijare.2017.3.3.12.

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Vibration-based damage detection is based on the fact that vibration characteristics such as natural frequencies and mode shapes of structures are changed when the damage occurs. This paper proposes dynamic species-size strategy in cooperative coevolution concept. The resulting algorithm, cooperative coevolutionary genetic algorithm with dynamics species-size (CCGADSS), is used as the optimization algorithm in the vibration-based damage detection in plates. The objective function is numerically calculated from the difference between experimentally vibration characteristics and numerically eval

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13

Xu, Tao, Yihang Zhu, Xiaomin Zhang, Zheyuan Wu, and Xiuqin Rao. "Dynamic Prediction Model for Initial Apple Damage." Foods 12, no. 20 (2023): 3732. http://dx.doi.org/10.3390/foods12203732.

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Prediction models of damage severity are crucial for the damage expression of fruit. In light of issues such as the mismatch of existing models in actual damage scenarios and the failure of static models to meet research needs, this article proposes a dynamic prediction model for damage severity throughout the entire process of apple damage and studies the relationship between the initial bruise form and impact energy distribution of apple damage. From the experiments, it was found that after impact a “cell death zone” appeared in the internal pulp of the damaged part of Red Delicious apples.

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Liu, Yunqiu, Anqi Fu, Binsong Jiang, Liyuan Yu, and Xiaobing Wang. "Study on the Static and Dynamic Fracturing Properties of Marble after Being Damaged Dynamically." Advances in Civil Engineering 2020 (September 4, 2020): 1–13. http://dx.doi.org/10.1155/2020/8886198.

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A split Hopkinson pressure bar (SHPB) system was first used to perform the cyclic impact loading tests on notched semicircular bend (NSCB) marble specimens. Then, static and dynamic three-point bending tests were conducted on these dynamically damaged specimens, respectively. In the cyclic impact loading tests, the dynamic elastic modulus decreases gradually as the impact number increases, but dynamic cumulative damage exhibits a growing trend. In the static and dynamic three-point bending tests, when dynamic cumulative damage is less than 0.345, the dynamic fracture toughness values are large

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15

Zheng, Qiangqiang, Hao Hu, Anying Yuan, et al. "Impact Dynamic Properties and Energy Evolution of Damaged Sandstone Based on Cyclic Loading Threshold." Shock and Vibration 2020 (November 27, 2020): 1–12. http://dx.doi.org/10.1155/2020/6615602.

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Rocks in deep coal mines are usually in varying degrees of damage state before they are destabilized by impact loads such as rock bursts. For the problem of the mechanical properties and energy evolution of damaged rocks under impact loads, the authors use static loads with different cyclic load thresholds to act on sandstone specimens to make them in distinct degrees of damage. Then, the rock mechanics system (MTS-816) and the Split Hopkinson pressure bar (SHPB) are employed to perform uniaxial compression and impact dynamics tests on sandstones with different degrees of damage. The results s

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16

Wang, Sheng Chun, Rong Sheng Shen, Tong Hong Jin, and Shi Jun Song. "Dynamic Behavior Analysis and its Application in Tower Crane Structure Damage Identification." Advanced Materials Research 368-373 (October 2011): 2478–82. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2478.

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First establish a dynamic model of tower crane in the load lifting process, the lifting load is solved.Then establish the FEM model of the tower crane under the normal and the damage condition. Get the dynamic displacement of the normal and the damage status under the lifting dynamic load. Propose a damaged diagnosis method by the displacement rate. The results of the study show that this method can not only diagnose the structural damage status, but also determine the positions of structural damage. This will be a new search on tower crane structural health diagnosis.

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17

Wong, Simon C., and Alan A. Barhorst. "Polynomial Interpolated Taylor Series Method for Parameter Identification of Nonlinear Dynamic System." Journal of Computational and Nonlinear Dynamics 1, no. 3 (2006): 248–56. http://dx.doi.org/10.1115/1.2209647.

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This research work is in the area of structural health monitoring and structural damage mitigation. It addresses and advances the technique in parameter identification of structures with significant nonlinear response dynamics. The method integrates a nonlinear hybrid parameter multibody dynamic system (HPMBS) modeling technique with a parameter identification scheme based on a polynomial interpolated Taylor series methodology. This work advances the model based structural health monitoring technique, by providing a tool to accurately estimate damaged structure parameters through significant n

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18

ÖZCAN, Zeki, and Ömer SEMİZ. "DETERMINATION OF STRUCTURAL DAMAGE LEVELS BY USING DYNAMIC PARAMETERS." INTERNATIONAL REFEREED JOURNAL OF ENGINEERING AND SCIENCES, no. 16 (2022): 0. http://dx.doi.org/10.17366/uhmfd.2022.16.3.

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Aim: This study revealed the relationship between the change in dynamic characteristics of structures damaged by exposure to extreme loads such as earthquakes, explosions, and impact and damage levels. Thus, a quick method can be used immediately after the damage has been proposed. Method: The studies consist of two parts, experimental measurements, and numerical solutions. For the analysis, a single degree of freedom, a four-column steel model structure was fabricated, and its free vibrations were recorded with the help of an accelerometer. Three scenarios are defined for the system no damage

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Zhang, Yunkai, Xixue Tan, Guohua Li, Jun Dong, Jingyi Guo, and Fanyue Liu. "Bridge Structure Damage Identification Based on Dynamic Characteristics." Coatings 12, no. 3 (2022): 313. http://dx.doi.org/10.3390/coatings12030313.

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With the increasing traffic volume and years of usage during the operation process, a bridge structure will experience aging and damage to different degrees, leading to the decline in bridge reliability and seriously affecting its operation safety. In this study, the bridge was abstracted into a beam structure for damage identification. Next, the influence of damage on the bridge structure was explored from the angles of its inherent frequency and displacement mode, respectively. Our results showed that whether the structure was damaged could be accurately judged by its inherent frequency, but

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20

Buravova, S. N., A. A. Goncharov, and Ju N. Kiselev. "Surface damage under dynamic loading." Tribology International 29, no. 5 (1996): 357–63. http://dx.doi.org/10.1016/0301-679x(95)00062-9.

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21

Su, Tian, Wei Su, Chenyu Du, Zhanfang Huang, Jianping Dong, and Chao Hu. "Damage identification of wind turbine blades based on dynamic characteristics." Nonlinear Engineering 11, no. 1 (2022): 47–57. http://dx.doi.org/10.1515/nleng-2022-0007.

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Abstract In this article, the Ansys Workbench was used to carry out the finite element analysis of 15 kW wind turbine blades with different damaged positions and different damaged degrees. The results show that the change rate of natural frequency, displacement modes, and strain modes of the blades increased with the increase in the damage degree; the change rate of the natural frequency and displacement modes of the blade decreased with the increase in the speed, while the change rate of the strain modes increased; the change allocation ratio of the displacement modes and strain modes after t

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Zhong, Ju Fang, Zhi Peng Fan, Luo Long Zhan, and Jun Wei Liang. "Reinforced Concrete Frame Structure Dynamic Analysis Based on SAP2000." Applied Mechanics and Materials 744-746 (March 2015): 211–16. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.211.

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Structure under long-term load, environmental erosion, material aging, especially under the seismic action can cause damage accumulation and bearing capacity decrease. In order to make sure its safety and reliable, avoid extreme cases of catastrophic accident, it is necessary to carry out the engineering structural health diagnosis. Using SAP2000 software, seismic response analysis for a two layer reinforced concrete frame structure is carried out. The laws of the acceleration response time history and spectrum under different seismic action were found out by discussing structure in no damage

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Duvnjak, Ivan, Domagoj Damjanović, Marko Bartolac, and Ana Skender. "Mode Shape-Based Damage Detection Method (MSDI): Experimental Validation." Applied Sciences 11, no. 10 (2021): 4589. http://dx.doi.org/10.3390/app11104589.

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The main principle of vibration-based damage detection in structures is to interpret the changes in dynamic properties of the structure as indicators of damage. In this study, the mode shape damage index (MSDI) method was used to identify discrete damages in plate-like structures. This damage index is based on the difference between modified modal displacements in the undamaged and damaged state of the structure. In order to assess the advantages and limitations of the proposed algorithm, we performed experimental modal analysis on a reinforced concrete (RC) plate under 10 different damage cas

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Wang, Yuexin, Tongfa Deng, Jinwen Huang, Maosen Cao, and Dragoslav Sumarac. "A Noise-Robust, Baseline-Free, and Adaptive Damage Indicator of Plate-like Structures Based on the Multicomponent Information Separation of High-Resolution Mode Shapes Using Wavelets." Sensors 25, no. 9 (2025): 2669. https://doi.org/10.3390/s25092669.

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Modal-based damage identification methods, particularly those utilizing mode shapes, excel in damage localization due to their spatial distribution characteristics. Traditional contact-based sensors often struggle with achieving high spatial resolution, while optical dynamic measurements, though high-resolution, are susceptible to environmental noise. This study proposes a novel multicomponent information separation (MIS) approach to overcome these challenges. The method decomposes mode shape information into noise, damage-related features, and waveform trends. The methodology begins with opti

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Zenkov, Solon. "Localization of structural damage based on its dynamic analysis." Transactions of the Krylov State Research Centre, SPECIAL ISSUE 1 (April 16, 2019): 170–76. http://dx.doi.org/10.24937/2542-2324-2019-1-s-i-170-176.

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This paper gives the results of analytical and experimental data on localization of structural damage, obtained through comparison of vibration modes for intact and damaged structure. The paper studies a standard dog-bone sample used for highcycle fatigue tests, the analysis being performed for its finite-element model. Necking damage of the sample was simulated by step-by-step elimination of elements from the model. Physical tests were performed as per the same approach. This paper studies the following damage localization methods: direct method of shape variation; shape curvature method and

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ALEKSEYTSEV, A. V., and M. D. ANTONOV. "DYNAMICS OF REINFORCED CONCRETE NON-BEAM FRAMES IN CASE OF DAMAGE TO SLABS PUNCHING." Building and reconstruction 96, no. 4 (2021): 23–34. http://dx.doi.org/10.33979/2073-7416-2021-96-4-23-34.

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An approach to the assessment of dynamic effects for reinforced concrete non-beam frames of structures under combined emergency actions is considered. Primary impacts imply an excess of operational loads, which causes damage to the slab-column junction from punching to the onset of a secondary impacts. Secondary impacts include considering the removal of any column from the design model over a finite time. The analysis of dynamic effects based on two approaches: the first is based on the energy method of G.A. Geniev and assumes a quasi-static assessment of the stress-strain state of the damage

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Zhao, Han, Liang Chen, Guisheng Zhong, et al. "Titanium Dioxide Nanoparticles Induce Mitochondrial Dynamic Imbalance and Damage in HT22 Cells." Journal of Nanomaterials 2019 (April 30, 2019): 1–16. http://dx.doi.org/10.1155/2019/4607531.

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Mitochondria, as dynamic organelles, are precisely regulated by fusion and fission. The dynamic balance of fusion and fission controls mitochondrial morphology and their subcellular location and function. Exposure to titanium dioxide nanoparticles (TiO2 NPs) may cause serious health problems. However, how TiO2 NPs affect the mitochondrial dynamics remains unclear. In the present study, we investigated the changes of mitochondrial dynamics in the TiO2NPs-treated HT22 cells by confocal and stimulated emission depletion (STED) microscopy. The confocal images demonstrated obvious changes in the av

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28

Hu, Chen, and Ke Ding. "Thin Plate Damage Analysis Based on Transient Displacement Response." Academic Journal of Science and Technology 15, no. 1 (2025): 249–58. https://doi.org/10.54097/v2k3e487.

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This study systematically simulates and analyzes the dynamic response of a thin plate structure under different damage conditions based on a transient model, aiming to evaluate the performance of Wave Atom transform, wavelet packet transform, and Curvelet transform in damage detection. By applying random initial displacement excitations to the thin plate structure and using optimized load step settings, the impact of different damage severities, damage ranges, boundary damage, and damage spacing on the dynamic response of the structure is analyzed. The results show that both Wave Atom and Curv

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Li, Suzhen, and Zhishen Wu. "C21 Non-baseline damage location based on dynamic macro-strain measurements." Proceedings of the Symposium on the Motion and Vibration Control 2005.9 (2005): 449–54. http://dx.doi.org/10.1299/jsmemovic.2005.9.449.

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Mei, Song-hua, Xu-li Liang, Lei Wen, and Zi-long Kou. "Experimental Study on Mechanical Properties of Freeze-Thaw Damaged Red Sandstone under Combined Dynamic and Static Loading." Shock and Vibration 2021 (November 11, 2021): 1–14. http://dx.doi.org/10.1155/2021/9980549.

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Using the freeze-thaw cycle test chamber, the red sandstone samples are subjected to cyclic freeze-thaw tests. The physical properties, static mechanical properties of freeze-thaw damage rocks, and the compressional wave velocity at specific axial pressure are measured using conventional physical tests and uniaxial compression tests. The mechanical properties of freeze-thaw damage rocks under dynamic and static loading were studied using Hopkinson pressure bar which can exert axial pressure. The studies show that, with the increase of freeze-thaw cycles, the surface layer of the rock sample un

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Yan, Qiushi. "Numerical Simulation of a Subway Station Structure Subjected to Terrorism Bombing." Open Civil Engineering Journal 9, no. 1 (2015): 688–92. http://dx.doi.org/10.2174/1874149501509010688.

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Subway stations are important means of transportation and main targets attacked by terrorists. In order to study the subway station response and damage subjected to blast loading, numerical simulation is carried out to estimate a subway station in beijing. An “explosive-air-structure ” dynamic interactive numerical model is built for the blast dynamic analysis of subway station subjected to blast. The patterns of damage about column are compared in different charges of explosive. The damages of concrete and reforcing bar in column are discussed. Although the column near the explosive is destor

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Cao, Li Lin, Ai Qun Li, and Yang Deng. "Experimental Research on Structural Damage Alarming of Benchmark Structure Based on Empirical Mode Decomposition." Advanced Materials Research 243-249 (May 2011): 61–66. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.61.

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A structural damage alarming method is proposed using empirical mode decomposition. The basic idea of this method is that with respect to the intact model and damaged models, the energy redistribution of the intrinsic mode functions decomposed from the structural response can represent the variation of the structural dynamic characteristics caused by the structural damage. By taking the Benchmark test model as the research object, the structural dynamic responses from the hammer-impact tests are collected then the damage alarming parameters and the damage alarming indices are evaluated. The ex

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Morassi, Antonino, and Luigi Rocchetto. "A Damage Analysis of Steel-Concrete Composite Beams Via Dynamic Methods: Part I. Experimental Results." Journal of Vibration and Control 9, no. 5 (2003): 507–27. http://dx.doi.org/10.1177/1077546303009005002.

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This paper is an experimental investigation on damage-induced changes in modal parameters of steel-concrete composite beams subject to small vibrations. Dynamic tests have been performed on two pairs of composite beams, whose connections have different linear densities, and three damage configurations for each beam have been analyzed. Damage was induced by removing concrete around some elements connecting the steel beam and the reinforced concrete slab and consequently causing a lack of structural solidarity between the two beams. Experiments revealed that: (i) unlike axial frequencies, flexur

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Cheng, Yuqiang, and Jianjun Wu. "Particle swarm algorithm-based damage-mitigating control law analysis and synthesis for liquid-propellant rocket engine." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 10 (2018): 3810–18. http://dx.doi.org/10.1177/0954410018806080.

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The damage-mitigating control is a novel technique to ameliorate the reliability and safety of liquid-propellant rocket engines by achieving an optimized trade-off level between overall dynamic performance of the liquid-propellant rocket engine and structural durability of some selected critical damageable components under the condition of no impact on the achievement of the launch and flight mission. Thus, it is needed to be solved for the damage-mitigating control that the global optimization of the best trade-off between the damage of the critical damageable components and the performance o

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Wang, Feifei, Jinggan Shao, Wenkai Li, Longfei Wang, Yafei Wang, and Honglin Liu. "Numerical Simulation Study on Lining Damage of Shield Tunnel under Train Load." Sustainability 14, no. 21 (2022): 14018. http://dx.doi.org/10.3390/su142114018.

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Under the long-term dynamic load influence of trains, shield tunnel structures are damaged. With the increase in operating number, cumulative damage gradually increases. When cumulative damage increases to a certain value, the tunnel lining produces cracks and loses tensile strength, which leads to tunnel deformation, damage, etc. In serious cases, the tunnel ceases operation, causing traffic accidents and casualties. Based on the finite element software ABAQUS, this paper analyses the change rule of tunnel lining damage under long-term dynamic train load and explores the influence of tunnel b

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Ikura, Masae, Kanji Furuya, Atsuhiko Fukuto, et al. "Coordinated Regulation of TIP60 and Poly(ADP-Ribose) Polymerase 1 in Damaged-Chromatin Dynamics." Molecular and Cellular Biology 36, no. 10 (2016): 1595–607. http://dx.doi.org/10.1128/mcb.01085-15.

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The dynamic exchange of histones alleviates the nucleosome barrier and simultaneously facilitates various aspects of cellular DNA metabolism, such as DNA repair and transcription. In response to DNA damage, the acetylation of Lys5 in the histone variant H2AX, catalyzed by TIP60, plays a key role in promoting histone exchange; however, the detailed molecular mechanism still is unclear. Here, we show that the TIP60 complex includes poly(ADP-ribose) polymerase 1 (PARP-1). PARP-1 is required for the rapid exchange of H2AX on chromatin at DNA damage sites. It is known that PARP-1 binds dynamically

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Li, Sheng Long, Liang Gao, and He Zhang. "Research on the Optimization Method of the Friction Plate Backlash." Key Engineering Materials 572 (September 2013): 476–79. http://dx.doi.org/10.4028/www.scientific.net/kem.572.476.

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Friction plate, the key part of the planetary transmission, is often damaged by the impact of the geer mesh. And the reason of the impact damage is not known yet. The backlash of the friction plate is crucial to the impact damage, thus the relationship of the backlash and impact damage is dissgussed in this study.The mathematic model is built up to calculate the impact force and the ADAMS dynamics simulation software is used to check the result of the mathematic model and get the dynamic characteristics of the impact force and provide the basis for the optimizing of backlash. Keywords: frictio

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Mohan, Poonam, and A. P. Shashikala. "Numerical Investigation on Flood Water Sloshing Influence on Intact and Damaged Stability of Ship." WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS 16 (January 12, 2022): 261–73. http://dx.doi.org/10.37394/232011.2021.16.29.

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Sloshing affects the intact and damage stability of the ship, which causes variation in dynamic metacentric height (GM) under critical load conditions. The transient flooding soon after the ship damage is analyzed, with floodwater accumulation in large space and causing the ship to suffer huge heel angles. The ship motion and stability changes when sloshing becomes high in partially flooded compartments. Most of the previous researches focus on the motion response of ship alone, hence the variation of stability due to sloshing is to be more critically studied. In the present study, three criti

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Minhas, Zill-e. Hasnain, and Sun Qin. "Evolution of the Coefficient of Dynamic Viscosity with Growing Damage in Metals." Applied Mechanics and Materials 313-314 (March 2013): 72–76. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.72.

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Coefficient of dynamic viscosity (η) for uniaxial rectangular bar of steel is calculated using creep simulation in Ansys. Norton Secondary creep law with coefficients at 600 ᵒC is used. Steel bar is then inflicted with some damage elements in order to investigate the evolution of dynamic viscosity for varying degree of fatigued specimen at constant rate and temperature. Isotropic damage parameter (D) based on the volume fraction of damaged elements is used to formulate a linear relation between the coefficient of viscosity and D. It is found that with 0.001 increase is damage parameter (D), al

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Biswas, S., P. K. Datta, and C. D. Kong. "Static and dynamic instability characteristics of curved laminates with internal damage subjected to follower loading." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 7 (2011): 1589–600. http://dx.doi.org/10.1177/0954406211399977.

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This article deals with the study of vibration, buckling, and dynamic instability characteristics in damaged cross-ply and angle-ply curved laminates under uniform, uniaxial follower loading, using finite element approach. First-order shear deformation theory is used to model the doubly curved panels and is formulated according to Sandars' first approximation. Damage is modelled using an anisotropic damage formulation. Analysis is carried out on plate and three types of curved panels to obtain vibration, buckling, and dynamic instability (flutter) behaviour. The effect of damage on natural fre

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Cheng, Cheng, Zhen Hua Nie, and Hong Wei Ma. "Structural Damage Detection of the Simple Beam Based on Responses Phase Space." Advanced Materials Research 605-607 (December 2012): 989–95. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.989.

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In this paper, the technology of attractor phase space in chaotic theory is introduced and applied in the structural damage detection. Firstly the phase plane is constructed with the displacement and acceleration responses. Using the changes of phase plane topology of intact and damaged responses, a new damage index is extracted, and the structural damage existence and severity are identified successfully. Since some of the state variables can not be measured, a method of phase space reconstruction is proposed using single dynamic response. The dynamic responses are directly displayed into pha

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KE, Xinmeng, Fusheng LI, and Zhaowei CHEN. "Damage Model of Bridge Bearing and Its Influence on Train-Track-Bridge Dynamic System." Mechanics 28, no. 6 (2022): 462–72. http://dx.doi.org/10.5755/j02.mech.30995.

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Bridge bearing damage is unavoidable in railway engineering. This work presents an investigation on the damage model of bridge bearing and its influence on the dynamic responses of the high-speed train-track-bridge system. Primarily, the mathematical description of bridge bearing damage model is explained in detail, which is then compared with the traditional linear model. Then a 3D train-track-bridge dynamic model considering bearing damage is established based on the train-track-bridge dynamic interaction theory. Adopting the model, the influences of single-point-damage and multi-point-damag

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Algolfat, Amna, Weizhuo Wang, and Alhussein Albarbar. "The Sensitivity of 5MW Wind Turbine Blade Sections to the Existence of Damage." Energies 16, no. 3 (2023): 1367. http://dx.doi.org/10.3390/en16031367.

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Due to the large size of offshore wind turbine blades (OWTBs) and the corrosive nature of salt water, OWTs need to be safer and more reliable that their onshore counterparts. To ensure blade reliability, an accurate and computationally efficient structural dynamic model is an essential ingredient. If damage occurs to the structure, the intrinsic properties will change, e.g., stiffness reduction. Therefore, the blade’s dynamic characteristics will differ from those of the intact ones. Hence, symptoms of the damage are reflected in the dynamic characteristics that can be extracted from the damag

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Volkov, Ivan, Leonid Igumnov, Svetlana Litvinchuk, and Igor Vorobtsov. "Modeling dynamic deformation and failure of thin-walled structures under explosive loading." EPJ Web of Conferences 183 (2018): 03016. http://dx.doi.org/10.1051/epjconf/201818303016.

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In the framework of mechanics of damaged media, behavior of thin-walled structures under pulsed loading is described. Account is taken of the interaction of the processes of dynamic deformation and damage accumulation, as well as of the main characteristic features of the dynamic failure process: the multi-staged character, nonlinear summation of damage, stressed state history and accumulated damage level. The chosen system of equations of thermo-plasticity describes the main effects of dynamic deformation of the material for random deformation trajectories. The equations of state are based on

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Chen, Luyang, Huaibao Chu, Donghui Wang, Bo Sun, Zilong Wen, and Haixia Wei. "Quantitative Representation of Dynamic Mechanical Properties and Internal Damage in Deep-Seated Damaged Granite." Applied Sciences 14, no. 23 (2024): 10813. http://dx.doi.org/10.3390/app142310813.

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Understanding the dynamics of damaged rock masses and the evolution of internal fractures is beneficial to the construction of deep engineering projects. Dynamic tests on damaged granite were carried out using a split Hopkinson device which can apply a confining pressure. A group of damaged granites was CT-scanned and three-dimensional reconstructed using Avizo 2020.1 software. The results indicate that with increasing damage, the peak stress and peak modulus of the damaged granite decrease, while the peak strain increases. When the initial damage is consistent, all three parameters increase w

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ZHU, XINQUN, and HONG HAO. "DAMAGE DETECTION OF RC SLABS USING NONLINEAR VIBRATION FEATURES." International Journal of Structural Stability and Dynamics 09, no. 04 (2009): 687–709. http://dx.doi.org/10.1142/s0219455409003247.

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Studied herein are the signatures of nonlinear vibration characteristics of damaged reinforced concrete structures using the wavelet transform (WT). A two-span RC slab built in 2003 was tested to failure in the laboratory. Vibration measurements were carried out at various stages of structural damage. The vibration frequencies, mode shapes, and damping ratios at each loading stage were extracted and analyzed. It is found that the vibration frequencies are not sensitive to small damages, but are good indicators when damage is severe. The dynamic responses are also analyzed in the time–frequency

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Makarov, N. S. "EXPERIMENTAL SETUP FOR DYNAMIC LOADING TIME-CONTROLLED." Problems of Strength and Plasticity 84, no. 4 (2023): 565–72. http://dx.doi.org/10.32326/1814-9146-2023-85-4-565-572.

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The occurrence and development of damage in concrete and other brittle materials subjected to mechanical loads of varying intensity and duration, at the macroscopic level manifests itself in the form of cracking and fragmentation and makes a significant contribution to the load-bearing capacity of structures. To quantify the strength degradation of the damaged material, a scalar damage parameter is often used. Experimental investigation of the damage accumulation process under high-speed dynamic loads requires a tool that allows stopping the deformation process of a specimen at a given strain

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Kim, Jong Ho, Young Gu Kim, Do Kyung Kim, Kee Sung Lee, and Soon Nam Chang. "Static and Dynamic Indentation Damage in SiC and Si₃N₄." Key Engineering Materials 287 (June 2005): 410–15. http://dx.doi.org/10.4028/www.scientific.net/kem.287.410.

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Hertzian and explosive indentations were used to determine the damage behavior of SiC and Si3N4 ceramics. Specimens were selected with different microstructures. In order to observe the subsurface damaged zone, the bonded interface technique was adopted. It was found that the damage response depends strongly on the microstructure of ceramics. Examination of subsurface damage reveals a competition between brittle and quasiplastic damage mode: brittle fracture mode is dominant in fine grain microstructure; quasiplastic deformation occurs in coarse grain. Dynamic indentation induces subsurface yi

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Liu, Yixiang, Lingbo Wang, Cong Jiang, and Hao Shu. "Research on Mechanical Performance of In-Service Continuous Rigid-Frame Bridge Based on Vehicle-Bridge Coupling Vibration." Applied Sciences 14, no. 16 (2024): 6950. http://dx.doi.org/10.3390/app14166950.

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Based on a damaged continuous rigid-frame bridge in Shaanxi Province, this study deduced the crack damage simulation algorithm and the vehicle-bridge coupling numerical algorithm. Then, it established a finite element analysis model using ANSYS APDL. The Newmark-β iterative method was used to study the dynamic response of different speeds, vehicle weights, and damage degrees before and after the structural damage. In the analysis of the influence of different speeds, the results showed that the dynamic stress responses of key sections of the undamaged bridge reached the maximum when the speed

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Mei, Liu, Huaguan Li, Yunlai Zhou, Dawang Li, Wujian Long, and Feng Xing. "Output-Only Damage Detection of Shear Building Structures Using an Autoregressive Model-Enhanced Optimal Subpattern Assignment Metric." Sensors 20, no. 7 (2020): 2050. http://dx.doi.org/10.3390/s20072050.

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This paper proposes a novel output-only structural damage indicator by incorporating the pole-based optimal subpattern assignment distance with autoregressive models to localize and relatively assess the severity of damages for sheared structures. Autoregressive models can model dynamic systems well, while their model poles can represent the state of the dynamic systems. Structural damage generally causes changes in the dynamic characteristics (especially the natural frequency, mode shapes and damping ratio) of structures. Since the poles of the autoregressive models can solve the modal parame

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