A review of the acoustic-emission monitoring of wire rope

Casey, N.F.; Laura, P.A.A.

doi:10.1016/s0029-8018(96)00052-2

Cited by 40 publications

(25 citation statements)

References 1 publication

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“…Defects source localization is an important function AE technology . In the AE monitoring of bridge cable, most sensors are fixed on the surface of cable sheath or anchor; thus, it cannot accurately locate the specific steel wire, which produces the defects and wire breaking, and the AE signal displays a large attenuation. Therefore, this paper proposes an innovative monitoring method that uses waveguides to draw out the steel wires at the end of the cable.…”

Section: Introductionmentioning

confidence: 99%

A novel acoustic emission monitoring method of cross-section precise localization of defects and wire breaking of parallel wire bundle

Shi

2019

Struct Control Health Monit

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Summary The monitoring and localization of defects and wire breaking of bridge cable are vital to the safe operation of the whole bridge. In this work, an innovative monitoring method that uses waveguides to draw out the steel wires at the end of the cable is proposed. This monitoring method can effectively capture the acoustic emission (AE) signal produced by defects and wire breaking of the cable. The transverse position of the wire breaking can also be accurately located so as to provide basis for the decision making of maintenance department. The pencil‐lead breaks (PLB) test method is utilized to investigate the influence of the transition modes between the waveguide and the sensor and the connection modes between the waveguide and the cone on the AE signal. The PLB test and tensile test method are utilized to examine the AE signal characteristics of different sensors at the end of steel wires. Results showed that the cone transition between the waveguide and the sensor and the welding connection between waveguide and cone exhibit the minimum effect on AE waveform and parameters, such as amplitude, compared with that of the reference sensor without waveguide. In the tensile test, the transverse position of the wire breaking cannot be identified by analyzing the AE signals collected by each senor when the wire breaks, whereas it can be identified in the process of defects before the wire breaks.

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Section: Introductionmentioning

confidence: 99%

A novel acoustic emission monitoring method of cross-section precise localization of defects and wire breaking of parallel wire bundle

Shi

2019

Struct Control Health Monit

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“…Khorrami et al , used linear motors to establish ultra-accurate high-speed six degree-of-freedom manipulation [1]. To measure the angle and speed of motor shafts, rotary encoders and tachometer sensors have been widely used because of their high performance and reliability [2–4]. …”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Model Reference Adaptive Control with Integral Action Employing a Rotary Encoder and Tachometer Sensors

Bai

et al. 2013

Sensors

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In this paper, an adaptive law with an integral action is designed and implemented on a DC motor by employing a rotary encoder and tachometer sensors. The stability is proved by using the Lyapunov function. The tracking errors asymptotically converge to zero according to the Barbalat lemma. The tracking performance is specified by a reference model, the convergence rate of Lyapunov function is specified by the matrix Q and the control action and the state weighting are restricted by the matrix Γ. The experimental results demonstrate the effectiveness of the proposed control. The maximum errors of the position and velocity with the integral action are reduced from 0.4 V and 1.5 V to 0.2 V and 0.4 V, respectively. The adaptive control with the integral action gives satisfactory performance, even when it suffers from input disturbance.

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“…The advantages of this technique over the others mentioned above include: (1) the possibility of using transducers permanently attached to the strand for continuous structural monitoring, (2) the potential for providing simultaneous defect detection and stress monitoring capabilities for the strands with the same sensing system, and (3) the possibility for detecting both active defects and pre-existing defects toggling between the modes of "passive" acoustic emission testing and "active" ultrasonic testing within the same sensing system. Recent applications of the GUWs technique were demonstrated for the evaluation of stress levels in post-tensioning rods and multi-wire strands 16,17,18,19,20 , as well as for the detection of isolated defects in these components 21,22,23 . The GUWs technique can be also used in a passive mode, for the real-time monitoring of active defects using acoustic emission principles.…”

Section: Introductionmentioning

confidence: 99%

“…The GUWs technique can be also used in a passive mode, for the real-time monitoring of active defects using acoustic emission principles. Successful use of the passive approach has been demonstrated for both steel and composite cables 23,24 . UCSD researchers in collaboration with CALTRANS have studied the use of guided waves in post-tensioned concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ultrasonic guided waves for stress monitoring in prestressing tendons for post-tensioned concrete structures

et al. 2009

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Many bridges, including 90% of the California inventory, are post-tensioned box-girders concrete structures. Prestressing tendons are the main load-carrying components of these and other post-tensioned structures. Despite their criticality, much research is needed to develop and deploy techniques able to provide real-time information on the level of prestress in order to detect dangerous stress losses. In collaboration with Caltrans, UCSD is investigating the combination of ultrasonic guided waves and embedded sensors to provide both prestress level monitoring and defect detection capabilities in concrete-embedded PS tendons.This paper presents a technique based on nonlinear ultrasonic guided waves in the 100 kHz -2 MHz range for monitoring prestress levels in 7-wire PS tendons. The technique relies on the fact that an axial stress on the tendon generates a proportional radial stress between adjacent wires (interwire stress). In turn, the interwire stress modulates nonlinear effects in ultrasonic wave propagation through both the presence of finite strains and the interwire contact. The nonlinear ultrasonic behavior of the tendon under changing levels of prestress is monitored by tracking higher-order harmonics at (nω) arising under a fundamental guided-wave excitation at (ω). Experimental results will be presented to identify (a) ranges of fundamental excitations at ω producing maximum nonlinear response, and (b) optimum lay-out of the transmitting and the receiving transducers within the test tendons. Compared to alternative methods based on linear ultrasonic features, the proposed nonlinear ultrasonic technique appears more sensitive to prestress levels and more robust against changing excitation power at the transmitting transducer or changing transducer/tendon bond conditions.

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A review of the acoustic-emission monitoring of wire rope

Cited by 40 publications

References 1 publication

A novel acoustic emission monitoring method of cross-section precise localization of defects and wire breaking of parallel wire bundle

A novel acoustic emission monitoring method of cross-section precise localization of defects and wire breaking of parallel wire bundle

Experimental Studies on Model Reference Adaptive Control with Integral Action Employing a Rotary Encoder and Tachometer Sensors

Nonlinear ultrasonic guided waves for stress monitoring in prestressing tendons for post-tensioned concrete structures

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