Nondestructive Testing Method for Curved Surfaces Based on the Multi-Gaussian Beam Model

Lu, Zongxing; Xu, Chunguang; Xiao, Di; Meng, Fanwu

doi:10.1007/s10921-015-0312-x

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…Following this work, Huang [21] developed the multi-Gaussian beam (MGB) model for a single transducer to simulate propagation through an anisotropic medium. Following Huang's work, the MGB model for a single transducer was then applied to composite curved parts [22].…”

Section: Simulation Of Ultrasonic Beam Propagation From Phased Arrays In Anisotropic Media Usingmentioning

confidence: 99%

Simulation of Ultrasonic Beam Propagation From Phased Arrays in Anisotropic Media Using Linearly Phased Multi-Gaussian Beams

Anand

Delrue

Jeong

et al. 2020

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Phased array ultrasonic testing is widely used to test structures for flaws due to its ability to produce steered and focused beams. The inherent anisotropic nature of some materials, however, leads to skewing and distortion of the phased array beam and consequently measurement errors. To overcome this, a quantitative model of phased array beam propagation in such materials is required, so as to accurately model the skew and the distortion. The existing phased array beam models which are based on exact methods or numerical methods are computationally expensive or time consuming. This article proposes a modeling approach based on developing the linear phased multi-Gaussian beam (MGB) approach to model beam steering in anisotropic media. MGBs have the advantages of being computationally inexpensive and remaining non-singular. This article provides a comparison of the beam propagation modeled by the developed ordinary Gaussian beam and linear phased Gaussian beam models through transversely isotropic austenitic steel for different steering angles. It is shown that the linear phased Gaussian beam model outperforms the ordinary one, especially at steering angles higher than 20 • in anisotropic solids. The proposed model allows us to model the beam propagation from phased arrays in both isotropic and anisotropic media in a way that is computationally inexpensive. As a further step, the developed model has been validated against a finite element model (FEM) computed using COMSOL Multiphysics.

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Section: Simulation Of Ultrasonic Beam Propagation From Phased Arrays In Anisotropic Media Usingmentioning

confidence: 99%

Simulation of Ultrasonic Beam Propagation From Phased Arrays in Anisotropic Media Using Linearly Phased Multi-Gaussian Beams

Anand

Delrue

Jeong

et al. 2020

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…The multi-Gaussian beam model describes the sound field distribution of the piston probe with a simple analytical expression. Its basic idea is to superimpose several single Gaussian sound beams [21]. The beam pressure distribution for a piston probe in liquid based on the multi-Gaussian beam model can be written as p(x,y,z,ω)ρ1cpv0(ω)=∑i=115An1+iBnz/Drexp(ikpDr)exp(iω(12XT(M1p(z))nbold-italicX)), where:v0(ω) is the sound speed radiated by the piezoelectric crystal piece at z = 0;ρ1 is the medium density (kg/m3);…”

Section: Ultrasonic Ndt Experiments Of the Dual-robot Ndt Systemmentioning

confidence: 99%

Ultrasonic Non-Destructive Testing System of Semi-Enclosed Workpiece with Dual-Robot Testing System

Guo

Hao

et al. 2019

Sensors

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With the rapid development of material science, more and more workpieces, especially workpieces with complex curved surfaces, are being made of composite materials. Robotic non-destructive testing (NDT) systems for complex curved surface composite material parts are being used more and more. Despite the emergence of such flexible NDT systems, the detection of semi-enclosed parts is also a challenge for robotic NDT systems. In order to overcome the problem, this paper establishes an NDT solution for semi-enclosed workpieces based on a dual-robot system of synchronous motion, in which an extension arm is installed on one of the robots and presents a trajectory planning method that always ensures the extension arm is parallel to the rotary axis of a semi-enclosed workpiece and that the ultrasonic probes are perpendicular to the workpiece surface. Trajectory analysis experiments and ultrasonic NDT experiments utilizing the optimal water path distance determined by simulation result of multi-Gaussian beam model for two types of semi-enclosed workpieces are performed with the dual-robot NDT system. Experimental results prove that the dual-robot NDT scheme functions well and the planned trajectories are correct. All the hole-shaped artificial defects with diameters ≥3 mm are detected by using 2.25 MHz ultrasonic probes through the transmission testing method. Vivid 3D C-scan image of a small diameter cylindrical workpiece based on the testing result is provided for convenience of observation.

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“…In this case, the energy attenuation of reflection echo is limited and stable ultrasonic waves are guaranteed. On the other hand, there are some deviations of robotic position and orientation existing in the test object due to the assembly errors, frictions, abrasions, and so on [21][22][23]. The spatial relationship between the robotic tool frame and the user frame should be estimated with the aid of coordinate conversion algorithm.…”

Section: Calibration By the Ultrasonic Signalsmentioning

confidence: 99%

Ultrasonic Adaptive Detection for Aerospace Components with Varying Thickness

Xiao

et al. 2017

Mathematical Problems in Engineering

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Automatic inspection of microdefects located in the aerospace components is difficult due to the imprecise scanning trajectory, especially for those specimens with varying thickness. In this paper, a new ultrasonic nondestructive testing (NDT) system using the robotic scanning trajectory is constructed for inspecting turbine blades. Additionally, an approach based on the analysis of ultrasonic signals is proposed to calibrate the trajectory; the ultrasonic image based on the threshold function represents the distribution of inner defects when the following gate is used to track the flaw echo. Therefore, the characteristic parameters of the flaw echo signals are easy to be discriminated if the reflection waves are stable in the time domain. Experimental result verified the effective and feasibility of the proposed approach; the distribution of inner defects can be shown with a higher resolution than other NDT methods when robotic orientation is correct at each point of scanning trajectory. Furthermore, the feature signals can be tracked more accurately during the ultrasonic signal processing if the ultrasonic distance was considered as a calibration coefficient of positional matrix. The proposed ultrasonic adaptive detection is adapted to complex geometric structure with a minimum resolution of equivalent diameter of the inner flaw being 0.15 millimeters.

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Nondestructive Testing Method for Curved Surfaces Based on the Multi-Gaussian Beam Model

Cited by 12 publications

References 11 publications

Simulation of Ultrasonic Beam Propagation From Phased Arrays in Anisotropic Media Using Linearly Phased Multi-Gaussian Beams

Simulation of Ultrasonic Beam Propagation From Phased Arrays in Anisotropic Media Using Linearly Phased Multi-Gaussian Beams

Ultrasonic Non-Destructive Testing System of Semi-Enclosed Workpiece with Dual-Robot Testing System

Ultrasonic Adaptive Detection for Aerospace Components with Varying Thickness

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