Damages Detection in a Composite Structure by Vibration Analysis

Lakhdar, Missoum; Mohammed, Djermane; Labbaci, Boudjemaa; Rabiâ, Abdeldjebar; Bachir, Moudden

doi:10.1016/j.egypro.2013.07.102

Cited by 23 publications

(13 citation statements)

References 9 publications

(8 reference statements)

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“…In some cases, alternative approaches are used in modeling, for instance Fuzzy Logic (Ganguli, 2001). Most often, an experimental study of blade modal properties are conducted using traditional techniques such as harmonic excitation or Roving Hammer Technique (Lakhdar, Mohammed, Boudjemâa, Rabiâ, & Bachir, 2013). To measure the dynamic response of a blade Autonomous Wireless Sensor Network (Ramirez, Loendersloot, & Tinga, 2013), built-in Accelerometer Arrays (White, Adams, & Rumsey, 2011), Optical Fiber Bragg Grating and Classical Stretch Sensors (Luczak, 2010) may be used.…”

Section: Introductionmentioning

confidence: 99%

Modal passport of dynamically loaded structures: application to composite blades

Mironovs¹,

Mironovs

2019

Modern Building Materials, Structures and Techniques (MBMST)

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Close relation of modal properties to mechanical properties of structures presents interest for applied research and solutions of Structural Health Monitoring (SHM) tasks. The paper considers application of analytical and modal analysis techniques for structural research and monitoring of composite blades as well as required measurement tools. The Roving Hummer Technique (RHT) and Operational Modal Analysis OMA) were admitted as optimal methods for modal properties estimation, but 3-axial accelerometers and vibration deformation sensors -as most acceptable measurement tools. There is discussion of methodology and technical aspects required for modal properties estimation of static and rotating blades. Samples of composite blades preparation for measurements and equipment applied for testing are considered. Authors discuss the modal passport concept as the platform for applied studies of modal properties and for diagnostic purposes including Structural Health Monitoring (SHM) of operating structures. Typical modal passport structure is described as the set of modal parameters that are common for same type of blades and generalized dependences of modal parameters from operational factors. The paper discusses the principles of modal passport application for a particular blade based on its individual modal properties. There are conclusions about application of typical modal passport in industry.

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Section: Introductionmentioning

confidence: 99%

Modal passport of dynamically loaded structures: application to composite blades

Mironovs¹,

Mironovs

2019

Modern Building Materials, Structures and Techniques (MBMST)

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“…In other fields, using these new materials as innovation tool and performance rising of their products such civil engineering. It is important first to have the best possible knowledge about these materials in somehow to monitor any changes in these properties and consequently their influence on the structure behavior (Lakhdar at. al., 2013;Li and Xu, 2013).…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Leak Detection in Galvanized Iron Pipe Using Nonlinear Acoustic Modulation Method

Priyandoko

2018

Sinergi

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Non-destructive testing is a wide group of analysis techniques used in science and industry to evaluate the properties of a structure without causing damage to it. The main objective of this project is to carry out experiment to detect leakage in pipeline using nonlinear acoustic modulation method. The nonlinear acoustic modulation approach with low frequency excitation and high frequency acoustic wave is used to reveal modulations in the presence of leak. The pipe used in this experiment was galvanized iron pipe. The experiment is started with the experiment of undamaged specimen and followed by the experiment of damaged specimen with manually applied leak. The results obtained are being observed and the difference between the specimen without leak and with leak can be distinguished. The distance of the leak and the distance of the outlet detected is nearly accurate to the exact location which is leak at 4.0 m and outlet at 6.0 m. Therefore, the results demonstrate that leakage can be detected using nonlinear acoustic modulation, and proved the objective of distinguish the difference between the results of specimen without leak and with leak has succeeded. The damage detection process can be eased with the knowledge on the signal features.

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“…As the freely decaying impulse responses observed in vibration analysis can be converted into electrical signals, the modes of the structure can be identified based on both the damping and frequency characteristics of the signals. When composite materials are examined, the signals often include many different frequency components at the same time or many different time components at the same frequency 17,18 . Time-frequency analysis is an effective way to detect these complexities presented in a vibration signal, and the short-time Fourier transform STFT is a basic method used in time-frequency analyses 19 22 .…”

mentioning

confidence: 99%

Short-time Fourier Transform of Free Induction Decays for the Analysis of Serum Using Proton Nuclear Magnetic Resonance

et al. 2019

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Serum is the liquid portion of blood routinely used as a clinical specimen. Serum consists of low-molecular-weight compounds 1 3 , macromolecules and their degradation products 4, 5 , inorganic ions 6, 7 , and water. Hydrogen nuclei in serum play important roles through intra-and intermolecular interactions with other nuclei. Most of the hydrogen atoms in serum are associated with water molecules or proteins. Water molecules form hydrogen bonds with nitrogen and hydrogen atoms in macromolecules and low-molecular-weight compounds, stabilizing their molecular conformations 8 11. Hydrogen bonding also takes place in the interactions between solutes. Thus, serum has its own dynamic features and assumes a supramolecular structure

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Damages Detection in a Composite Structure by Vibration Analysis

Cited by 23 publications

References 9 publications

Modal passport of dynamically loaded structures: application to composite blades

Modal passport of dynamically loaded structures: application to composite blades

Non-Destructive Leak Detection in Galvanized Iron Pipe Using Nonlinear Acoustic Modulation Method

Short-time Fourier Transform of Free Induction Decays for the Analysis of Serum Using Proton Nuclear Magnetic Resonance

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