Identifying Impacts in Composite Plates with Piezoelectric Strain Sensors, Part I: Theory

Tracy, Michael J.; Chang, Fu‐Kuo

doi:10.1177/1045389x9800901108

Cited by 61 publications

(42 citation statements)

References 4 publications

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“…Gaul and Hurlebaus adapt the classic plate theory (CPT) as a theoretical solution to an impact load after identification of the location of impact load using wavelet transforms [2]. In the determination of the impact energy, there are different approach methods [3,4]. These methods are based on a structure model to predict the response to impact load.…”

Section: Introductionmentioning

confidence: 98%

“…One method uses the strain gauges as sensors [3]. The other uses the piezoelectric film as sensors [4]. These methods use the classic plate theory as a predictive model for predicting the response to an impact load in the structure model.…”

Section: Introductionmentioning

confidence: 99%

“…The impact load identification problem in the plate has been investigated extensively [1][2][3][4][5]. Michael and Pao [1] developed a method that determined a dynamic force using wave motion measurement.…”

Section: Introductionmentioning

confidence: 99%

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Identification of impact force in thick plates based on the elastodynamics and time-frequency method (II)

Kim

Lee

2008

J Mech Sci Technol

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The paper presents a novel experimental method for the determination of the impact load in the thick plate based on the theoretical Green's function and the measured waveforms by the sensors arrayed on the surface on the plate. This method requires the location of the impact load. For the accurate estimation of location of impact source in a plate, the arriving time difference between sensors and the propagation velocity of acoustic waveform are necessary. Their measurements are difficult since the acoustic waveforms are dispersive with multi modes in the plate. The time frequency analysis for the acoustic waveform gives the information about the time difference for multi mode dispersive waveform. For the estimation of location of impact source in a plate, the information on the group velocity of the A0 flexible mode is important. In the paper, various time frequency methods are introduced and their methods are compared with simulated signals. The combined higher order time frequency (CHOTF) is employed for dispersive information for the A0 mode flexible mode. The location of impact source and the magnitude of impact load are well estimated based on the theoretical Green's function and the CHOTF for the acoustic waveforms measured by three sensors arrayed on the plate.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Identification of impact force in thick plates based on the elastodynamics and time-frequency method (II)

Kim

Lee

2008

J Mech Sci Technol

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“…While problems of the first category are described as direct problems, the second and third types are inverse problems. Inverse problems are of great current interest in a variety of applications and they have been investigated extensively by many authors [1][2][3][4][5]. Therefore, a system that can detect the location of impact and estimate its energy can be very helpful in developing health-monitoring systems for advanced structures.…”

Section: Introductionmentioning

confidence: 99%

Identification of impact force in thick plates based on the elastodynamics and time-frequency method (I)

Lee

2008

J Mech Sci Technol

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Determination of impact load is important for detecting and analyzing the flaws in thick plate. In industrial plants, thick aluminum plate is popularly used and impact load is identified by convolving the acoustic waveform, which is measured with sensors arrayed on the plate, and by Green's function, which is the transfer function between impacting position and sensor. In practical situations, it is difficult to measure Green's function. In this paper, the impact load on the plate is inversely recovered by using Green's function and the acoustic waveform. Green's function and the acoustic waveform are theoretically obtained based on the plate theory. There are three plate theories. One is the classic plate theory (CPT), which has been used for thin plate. The others are the exact plate theory and the approximated shear deformation theory (SDPT), which are used for the thick plate because the CPT overestimates the group velocity at high frequency in the thick plate. In this paper, the thick plate theory is used for the prediction of the acoustic waveform. This theoretical Green's function can be also used for the inverse problem of impact load based on the experimental method.

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“…Identifying the characteristics of the force generated by impact can be used to better know the residual health of structures at risk of impacts, and thus enabling to reduce hugely the required experimental effort [2,3]. In case of simple linear elastic structures with homogeneous geometric and material properties such as beams or plates, identification of impact characteristics can be implemented through using a structural model [4,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of measurement noise on the PSO based localization of an impact occurring on elastic plates

El-Bakari¹,

Khamlichi²,

Dkiouak³

2014

MATEC Web of Conferences

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Abstract. This paper presents the application of particle swarm optimization algorithm to reconstruct the characteristics of impacts occurring on homogeneous and isotropic elastic plates and which cannot be reduced to a concentrated force. Solution of this inverse problem was achieved through minimizing a fitness function defined in terms of the root mean square error between the measured and the calculated responses. This included information provided by numerous sensors. The impacting force was assumed to result from uniformly distributed pressure acting over a rectangular patch. Use was made of the reciprocity theorem to decouple the localization problem from the deconvolution part intended to reconstruct the pressure time signal. The particle swarm optimization based model was found to be highly efficient in finding the impact zone location. Focus was done on the robustness aspect of force impact localization when an additive white noise is assumed to perturb response measurements.

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Identifying Impacts in Composite Plates with Piezoelectric Strain Sensors, Part I: Theory

Cited by 61 publications

References 4 publications

Identification of impact force in thick plates based on the elastodynamics and time-frequency method (II)

Identification of impact force in thick plates based on the elastodynamics and time-frequency method (II)

Identification of impact force in thick plates based on the elastodynamics and time-frequency method (I)

Influence of measurement noise on the PSO based localization of an impact occurring on elastic plates

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