Sensitivity-based operational mode shape normalisation: Application to a bridge

Parloo, Eli; Cauberghe, Bart; Benedettini, F.; Alaggio, Rocco; Guillaume, Patrick

doi:10.1016/j.ymssp.2004.03.009

Cited by 71 publications

(38 citation statements)

References 23 publications

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“…In most cases, a modified parameter of the object is a matrix of the masses. The change is mostly at one [18,19] or more [20] measurement points. The techniques used to determine the scaling coefficients are based on different assumptions.…”

Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

“…Both experiments are performed on the same network points and assume similar operating conditions to force the object. In the simplest case [18][19][20][21][22], it is assumed that a slight modification of the mass at a point disturbs only the natural frequencies and does not change the mode shape. The formulation according to scaling in this case can be performed independently for each identified mode shape.…”

Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

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Operational modal filter and its applications

Mendrok

Kurowski

2012

Arch Appl Mech

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In the paper, the procedure for the estimation of modal filter coefficients from output-only data is presented. The basic concept of the procedure consists in frequency response functions synthesis based on the knowledge of an operational modal model. A method of operational mode shapes scaling is described. The method is then compared with the classical modal filter and with modal filtration of responses spectra, which is sometimes used as a solution for modal filtration based on the output-only data. Each solution is applied to load identification and damage detection. The study shows the method verification on data obtained from laboratory experiment.

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Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

Section: Frfs Synthesis Using Scaled Operational Modal Modelmentioning

confidence: 99%

Operational modal filter and its applications

Mendrok

Kurowski

2012

Arch Appl Mech

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“…Different approaches to perform a modal analysis on civil constructions such as bridges are commonly in practice [1][2][3][4][5][6][7][8][9][10][11][12]. Depending on the excitation used these methods are divided into Experimental Modal Analysis (EMA) or Operational Modal Analysis (OMA).…”

Section: Introductionmentioning

confidence: 99%

“…Because the ambient forces are unknown, only unscaled modal model estimates can be obtained. Additional measurements are required to obtain a scaled modal model as explained in [4]. Examples of structures successfully tested with OMA are the Heritage Court Tower (Vancouver, Canada) and the Vasco da Gama Bridge [3].…”

Section: Introductionmentioning

confidence: 99%

Implementation of the Scanning Laser Doppler Vibrometer Combined with a Light-Weight Pneumatic Artificial Muscle Actuator for the Modal Analysis of a Civil Structure

Deckers

Guillaume

Vuye

et al. 2012

Shock and Vibration

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Abstract. The identification of the modal parameters of bridges and other large civil constructions has become an important research issue. Different approaches have been proposed depending on the excitation used: ambient excitations (due to wind, traffic, . . .) or artificial excitations (e.g. impact test with heavy drop weights). In practice it turns out that not all modes are well excited by the ambient forces. Hence the application of an artificial actuator is advisable. The problem is that larger constructions often require large and heavy excitation devices, which are hard to manipulate. Another difficulty encountered in performing a modal analysis on large civil constructions is the necessity for a large number of high sensitivity sensors. Consequently a large number of cables has to be installed resulting in a large setup time.This paper is a proof-of-concept which demonstrates the possibility of using lightweight Pneumatic Artificial Muscles combined with the scanning laser Doppler vibrometer to perform a modal analysis on a civil structure. This combination allows for an important reduction in setup time and allows for sine testing as well as the application of broadband signals such as periodic chirps, true noise or multisines.

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“…The method utilizes the harmonic transfer function concept by Wereley and Hall, which is an extension to the concept of a frequency response function (FRF) to linear time-periodic systems [17][18][19]. This method can be thought of as an extension of Output-only Modal Analysis [20][21][22][23][24][25] or the Natural Excitation Technique (NExT) [26] to timeperiodic systems.…”

Section: Introductionmentioning

confidence: 99%

Output-Only Modal Analysis Using Continuous-Scan Laser Doppler Vibrometry and Application to a 20kW Wind Turbine

Yang

Allen

2011

Conference Proceedings of the Society for Experimental Mechanics Series

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Abstract:Continuous-scan laser Doppler vibrometry (CSLDV) is a method whereby one continuously sweeps the laser measurement point over a structure while measuring, in contrast to the conventional scanning LDV approach where the laser spot remains stationary while the response is collected at each point. The continuousscan approach can greatly accelerate measurements, allowing one to capture spatially detailed mode shapes along a scan path in the same amount of time that is typically required to measure the response at a single point. The method is especially beneficial when testing large structures, such as wind turbines, whose natural frequencies are very low and hence require very long time records. Several CSLDV methods have been presented that employ harmonic excitation or impulse excitation, but no prior work has performed CSLDV with an unmeasured, broadband random input. This work extends CSLDV to that class of input, developing an outputonly CSLDV method (OMA-CSLDV). This is accomplished by adapting a recently developed algorithm for linear time-periodic systems to the CSLDV measurements, which makes use of harmonic power spectra and the harmonic transfer function concept developed by Wereley. The proposed method is validated on a randomly excited free-free beam, where one-dimensional mode shapes are captured by scanning the laser along the length of the beam. The natural frequencies and mode shapes are extracted from the harmonic power spectrum of the vibrometer signal and show good agreement with the first seven analytically-derived modes of the beam. The method is then applied to identify the shapes of several modes of a 20kW wind turbine using a ground based laser and with only a light breeze providing excitation.

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Sensitivity-based operational mode shape normalisation: Application to a bridge

Cited by 71 publications

References 23 publications

Operational modal filter and its applications

Operational modal filter and its applications

Implementation of the Scanning Laser Doppler Vibrometer Combined with a Light-Weight Pneumatic Artificial Muscle Actuator for the Modal Analysis of a Civil Structure

Output-Only Modal Analysis Using Continuous-Scan Laser Doppler Vibrometry and Application to a 20kW Wind Turbine

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