Modelling the Generation and Propagation of Ultrasonic Signals in Cylindrical Waveguides

Seco, Fernando; Jiménez, Antonio R.

doi:10.5772/29804

Cited by 61 publications

(47 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to the dispersion curves in Fig. 3 obtained for a single straight wire from PCdisp package [7] this frequency is located in non-dispersive region and it is a good candidate to generate L(0,1). It is worthy of mention that dispersive behavior of the L(0,1) mode in a single straight wire is not much different than a helical wire in this frequency region [8].…”

Section: Experiments and Resultsmentioning

confidence: 98%

Advanced signal processing methods applied to guided waves for wire rope defect detection

Tse

Rostami

2016

AIP Conference Proceedings

View full text Add to dashboard Cite

A preliminary study of multi-parameter POD curves for a guided waves based SHM approach to lightweight materials AIP Conference Proceedings 1706, 030018 (2016) Abstract. Steel wire ropes, which are usually composed of a polymer core and enclosed by twisted wires, are used to hoist heavy loads. These loads are different structures that can be clamshells, draglines, elevators, etc. Since the loading of these structures is dynamic, the ropes are working under fluctuating forces in a corrosive environment. This consequently leads to progressive loss of the metallic cross-section due to abrasion and corrosion. These defects can be seen in the forms of roughened and pitted surface of the ropes, reduction in diameter, and broken wires. Therefore, their deterioration must be monitored so that any unexpected damage or corrosion can be detected before it causes fatal accident. This is of vital importance in the case of passenger transportation, particularly in elevators in which any failure may cause a catastrophic disaster. At present, the widely used methods for thorough inspection of wire ropes include visual inspection and magnetic flux leakage (MFL). Reliability of the first method is questionable since it only depends on the operators' eyes that fails to determine the integrity of internal wires. The later method has the drawback of being a point by point and time-consuming inspection method. Ultrasonic guided wave (UGW) based inspection, which has proved its capability in inspecting plate like structures such as tubes and pipes, can monitor the cross-section of wire ropes in their entire length from a single point. However, UGW have drawn less attention for defect detection in wire ropes. This paper reports the condition monitoring of a steel wire rope from a hoisting elevator with broken wires as a result of corrosive environment and fatigue. Experiments were conducted to investigate the efficiency of using magnetostrictive based UGW for rope defect detection. The obtained signals were analyzed by two time-frequency representation (TFR) methods, namely the Short Time Fourier Transform (STFT) and the Wavelet analysis. The location of the defect and its severity were successfully identified and characterized.

show abstract

Section: Experiments and Resultsmentioning

confidence: 98%

Advanced signal processing methods applied to guided waves for wire rope defect detection

Tse

Rostami

2016

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…(9), the direction of propagation z is still treated analytically. One way to solve (9) is to postulate solutions to be of the form ψ(z) =ψe λz (11) where ψ contains the amplitudes of nodal displacements and forceŝ ψ = û n q n (12) withq n = λE 0ûn + E T 1û n (13) λ is defined as λ = ik (14) where k can be identified as the wavenumber of a mode in the structure. Substituting (11) into (9) one obtains the eigenvalue problem −Zψ = λψ (15) or in matrix notation −Z = (16) where the columns of are the eigenvectors and denotes the diagonal matrix with the eigenvalues being the elements on the diagonal.…”

Section: Stiffness Matrices Of a Homogeneous Platementioning

confidence: 99%

“…For plates and pipes of infinite length, analytical approaches are well-established to compute wavenumbers and mode shapes of guided wave modes (see e.g. [9][10][11][12][13][14]). The knowledge of the modal propagation behavior helps to analyze the signals or extract modal reflection coefficients from standard Finite Element analyses by means of modal decomposition.…”

Section: Introductionmentioning

confidence: 99%

Simulation of elastic guided waves interacting with defects in arbitrarily long structures using the Scaled Boundary Finite Element Method

Gravenkamp

Birk

Song

2015

Journal of Computational Physics

View full text Add to dashboard Cite

“…2a shows the phase velocities of the first propagating modes in the pipe. Results have been compared with the software PCdisp [9]. The group velocities presented in Fig.…”

Section: A Aluminum Pipementioning

confidence: 99%

Numerical simulation of ultrasonic guided waves using the Scaled Boundary Finite Element Method

Gravenkamp

Song

Prager

2012

2012 IEEE International Ultrasonics Symposium

View full text Add to dashboard Cite

The formulation of the Scaled Boundary Finite Element Method is applied for the computation of dispersion properties of ultrasonic guided waves. The cross-section of the waveguide is discretized in the Finite Element sense, while the direction of propagation is described analytically. A standard eigenvalue problem is derived to compute the wave numbers of propagating modes. This paper focuses on cylindrical waveguides, where only a straight line has to be discretized. Higher-order elements are utilized for the discretization. As examples, dispersion curves are computed for a homogeneous pipe and a layered cylinder.

show abstract

Modelling the Generation and Propagation of Ultrasonic Signals in Cylindrical Waveguides

Cited by 61 publications

References 42 publications

Advanced signal processing methods applied to guided waves for wire rope defect detection

Advanced signal processing methods applied to guided waves for wire rope defect detection

Simulation of elastic guided waves interacting with defects in arbitrarily long structures using the Scaled Boundary Finite Element Method

Numerical simulation of ultrasonic guided waves using the Scaled Boundary Finite Element Method

Contact Info

Product

Resources

About