Intelligent damage identification method for large structures based on strain modal parameters

He, Longjun; Lian, Jijian; Ma, Bin

doi:10.1177/1077546312475150

Cited by 34 publications

(24 citation statements)

References 28 publications

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“…Hong et al [22] conducted a comprehensive comparison of macrostrain mode and displacement mode obtained from distributed macrostrain sensing and high-density point sensing (e.g., accelerometers) technologies. Because of the highly sensitive characteristic to local defects, modal curvature and/or modal strain based quantities have been widely utilized to identify the presence, locations, and severity of damage in dynamic structures by the comparisons of before and after damage [23][24][25][26]. For the assessment of structural status, modal macrostrain vectors, macrostrain frequency response functions, and modal curvatures were successfully applied in structural health monitoring [27,28].…”

Section: Shock and Vibrationmentioning

confidence: 99%

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Zhou

Trišović

et al. 2016

Shock and Vibration

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Design optimization of dynamic properties, for example, modal frequencies, can be of much importance when structures are exposed to the shock and/or vibration environments. A modal strain based method is proposed for fast design of natural frequencies of plate-like structures. The basic theory of modal strains of thin plates is reviewed. The capability of determining the highly sensitive elements by means of modal strain analysis is theoretically demonstrated. Finite element models were constructed in numerical simulations. Firstly, the application of the proposed method is conducted on a central-massed flat plate which was topologically optimized by the Reference. The results of modal strain analysis at the first mode have good agreement with the results from the topology optimization. Furthermore, some features of the strain mode shapes (SMSs) of the flat plate are investigated. Finally, the SMSs are applied to the optimization of a stiffened plate. Attention is focused on the distributions of the SMSs of the stiffeners, which also shows good agreement with the results from the topology optimization in the previous study. Several higher orders of SMSs are extracted, which can visualize the most sensitive elements to the corresponding modal frequency. In summary, both the theory and simulations validate the correctness and convenience of applying SMSs to dynamic design of plate-like structures.

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Section: Shock and Vibrationmentioning

confidence: 99%

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Zhou

Trišović

et al. 2016

Shock and Vibration

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“…The intense vibration induced by flood discharge may cause significant damage to hydraulic structures, especially to the accessory structures (e.g., guide walls [1,2], sluice gates [3] and gate piers [4]) on the dam body. Moreover, it had been found that the vibration can be transmitted from the superstructure to the dam foundation, and then to the neighboring ground, which may seriously impact the safety of the nearby buildings as well as the physical and mental health of the building residents.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Cause and Mechanism of Hydraulic Gate Vibration during Flood Discharging from the Perspective of Structural Dynamics

Lian

Lin

et al. 2020

Applied Sciences

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According to the results of a dynamic prototype test for the surface outlet radial gate on the Jinping high arch dam during the flood discharging process, a novel cause of vibration fundamentally different from the traditional causes of flow-induced radial gate vibration, is analyzed for the first time. Under the condition that the flood is discharged only from mid-level outlets, an accompanying vibration of the surface outlet gate is induced by the vibration of the closely spaced mid-level outlet gates. It is counterintuitive that the most intense vibration occurs when the surface outlet gate is closed and, on the contrary, the vibration is reduced when the gate is opened and subjected to flow excitation. In order to analyze and explain this accompanying vibration phenomenon, a theoretical model is developed based on the conventional theory of passive vibration absorbers. The difference between the proposed and conventional theoretical models is that more complex load and damping conditions are considered, and more attention was paid to the dynamic behavior of the accessory structure. Then, the cause and mechanism for the surface outlet gate vibration is clarified in detail, based on the proposed theoretical model. The comprehensive analysis and mutual verification of the prototype test, theoretical derivation and numerical simulation, indicate that the clarification and the proposed theoretical model is reasonable and accurate. The research reported in this paper will be beneficial for the design, operation and maintenance of the hydraulic gates installed on high arch dams.

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“…With regard to fluctuating pressure and vibrational characteristics, conventional research techniques include theoretical derivation [16], model tests [13], prototype tests [17], and numerical simulation [18]. There have also been various damage diagnosis algorithms presented for the guide wall [19,20]. The above studies are focused on structural optimizations and excitations; however, for the vibration mechanism and dynamic response of the guide wall, conventional research methods are inadequate.…”

Section: Introductionmentioning

confidence: 99%

Analysis for the Vibration Mechanism of the Spillway Guide Wall Considering the Associated-Forced Coupled Vibration

et al. 2019

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During the flood discharge in large-scale hydraulic engineering projects, intense flow-induced vibrations may occur in hydraulic gates, gate piers, spillway guide walls, etc. Furthermore, the vibration mechanism is complicated. For the spillway guide wall, existing studies on the vibration mechanism usually focus on the vibrations caused by flow excitations, without considering the influence of dam vibration. According to prototype tests, the vibrations of the spillway guide wall and the dam show synchronization. Thus, this paper presents a new vibration mechanism of associated-forced coupled vibration (AFCV) for the spillway guide wall to investigate the dynamic responses and reveal coupled vibrational properties and vibrational correlations. Different from conventional flow-induced vibration theory, this paper considers the spillway guide wall as a lightweight accessory structure connected to a large-scale primary structure. A corresponding simplified theoretical model for the AFCV system is established, with theoretical derivations given. Then, several vibrational signals measured in different structures in prototype tests are handled by the cross-wavelet transform (XWS) to reveal the vibrational correlation between the spillway guide wall and the dam. Afterwards, mutual analyses of numeral simulation, theoretical derivation, and prototype data are employed to clarify the vibration mechanism of a spillway guide wall. The proposed mechanism can give more reasonable and accurate results regarding the dynamic response and amplitude coefficient of the guide wall. Moreover, by changing the parameters in the theoretical model through practical measures, the proposed vibration mechanism can provide benefits to vibration control and structural design.

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Intelligent damage identification method for large structures based on strain modal parameters

Cited by 34 publications

References 28 publications

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Modal Strain Based Method for Dynamic Design of Plate-Like Structures

Analysis of the Cause and Mechanism of Hydraulic Gate Vibration during Flood Discharging from the Perspective of Structural Dynamics

Analysis for the Vibration Mechanism of the Spillway Guide Wall Considering the Associated-Forced Coupled Vibration

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