Journal ArticleDOI
Propagation phenomena of wideband guided waves in a bended pipe.
TLDR
The propagation phenomena of guided waves in a bended pipe were investigated using a wideband laser ultrasonic system and indicated the amplitude of the F(1,1) mode converted from the L(0, 1) mode increased with the increase of the bending angle.About:
This article is published in Ultrasonics.The article was published on 2006-12-22. It has received 40 citations till now. The article focuses on the topics: Guided wave testing & Ultrasonic sensor.read more
Citations
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Journal ArticleDOI
Interaction of low-frequency axisymmetric ultrasonic guided waves with bends in pipes of arbitrary bend angle and general bend radius.
TL;DR: This work uses 3D Finite Element (FE) simulation to understand the propagation of fundamental axisymmetric L(0,2) mode across bends of different angles φ, and shows that as the bend angle is reduced, a progressively larger extent of mode-conversion affects the transmission and velocity characteristics of the L(1,1) mode.
Journal ArticleDOI
Wave propagation in mechanical waveguide with curved members using wave finite element solution
Zhou Wenjin,Mohamed Ichchou +1 more
TL;DR: In this paper, the wave propagation in straight and curved mechanical waveguide is investigated and a numerical model is developed to determine the response of the intact or damaged waveguide structure which is subjected to the incident waves.
Journal ArticleDOI
The investigation of guided wave propagation around a pipe bend using an analytical modeling approach
TL;DR: A study has been carried out that uses a combination of finite element analysis and experimentation to understand the behavior of guided waves in pipe bends and an analytical modeling methodology is put forward that uses basic information from finite element models of pipe bends to create a computationally fast solution to a potentially infinite number of scenarios.
Journal ArticleDOI
Reflection of torsional T(0,1) guided waves from defects in pipe bends
TL;DR: In this paper, the effect of varying circumferential and angular position along the pipe bend, as well as the influence of the bend radius, is investigated via 3D finite element simulations.
Journal ArticleDOI
Detection of minor damage in structures with guided wave signals and nonlinear oscillator
TL;DR: In this paper, a nonlinear oscillator with the recorded UGW signal as an added input is proposed for the detection of minor structural damage, where the UGW is treated as the driving force of the nonlinear system and the Lyapunov exponents with a moving window are used to determine the arriving time of the echo signal.
References
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Book
Ultrasonic Waves in Solid Media
TL;DR: In this article, the theory of elasticity was introduced and basic formulas and concepts in complex variables in the theory and application of wave propagation were discussed. But the authors did not consider the effects of wave scattering on the wave propagation experiments.
Journal ArticleDOI
Three‐Dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. I. Analytical Foundation
TL;DR: In this paper, the propagation of free harmonic waves along a hollow circular cylinder of infinite extent is discussed within the framework of the linear theory of elasticity, and a characteristic equation appropriate to the circular hollow cylinder is obtained by use of the Helmholtz potentials for arbitrary values of the physical parameters involved.
Journal ArticleDOI
An Experimental and Theoretical Investigation of Elastic Wave Propagation in a Cylinder
TL;DR: In this paper, a high speed computer was used to investigate the problem of wave propagation in an isotropic elastic cylinder, and an approximate solution was found for the L(0,1) mode impinging on a traction-free interface.
Journal Article
Long range propagation of Lamb waves in chemical plant pipework
D. N. Alleyne,Peter Cawley +1 more
TL;DR: In this paper, a dry coupled piezoelectric transducer system designed to detect corrosion in chemical plant pipework using cylindrical Lamb waves is described, which has been successfully propagated over distances approaching 50 m (160 ft; equivalent to 100 m [320 ft] round trip in pulse echo mode) in 152 mm (6 in.) diameter steel pipes in operating chemical plants.
Journal ArticleDOI
Mode Coupling Occurring in the Propagation of Elastic Pulses in Wires
TL;DR: In this paper, the propagation of elastic pulses in wires of circular cross section has been studied for conditions in which pulses having carrier frequencies ranging from 0.5 to 4.0 Mc were transmitted in wires having diameters between 0.1 and 0.2 cm.