Acoustic emission monitoring of reinforced concrete beams subjected to four-point-bending

Prem, Prabhat Ranjan; Murthy, A. Ramachandra

doi:10.1016/j.apacoust.2016.08.006

Cited by 141 publications

(55 citation statements)

References 27 publications

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“…For example, researchers have extensively applied AE techniques to monitor concrete structures [43,[64][65][66][67][68]. Aldahdooh et al [41] and Prem et al [69] demonstrated that AE technique was an effective technique to monitor the damage process of reinforced concrete. EI Batanouny et al [70] revealed that AE technology was more sensitive than the evaluation criteria in ACI 437, and found that damage quantification charts were based on the failure procedure of pre-stressed concrete beams.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

et al. 2018

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Pin connections are one of the most important connecting forms and they have been widely used in engineering fields. In its service, pin connections are subject to wear, and it will be beneficial if the health condition of pin connections can be monitored in real time. In this paper, an acoustic emission (AE)-based method was developed to monitor wear degree of low rotational speed pin connections in real time in a nondestructive way. Most pin connections are operated at low rotational speed. To facilitate the research, an experimental apparatus to accelerate the wear test of low rotational speed pin connections was designed and fabricated. The piezoceramic AE sensor was mounted on the test apparatus in a nondestructive way, and it was capable of real-time monitoring. Accelerated wear tests of low rotational speed pin connections were conducted. To verify the results of the AE technique, a VHX-600E digital (from Keyence, Osaka, Japan) microscope was applied to observe the micrographs of the tested pins. The experimental results show that AE activity existed throughout the entire wear process, and it was the most prominent in the serious wear phase. The wear degree of the pin connections can be reflected qualitatively by the signal strength and the accumulative signal strength of the AE signals. In addition, two different wear forms can be distinguished by comparing the signal strength values of all specimens. Micrographs of all specimens confirm these results, and determine that the two wear forms include adhesive wear and abrasive wear. Furthermore, AE results demonstrated that adhesive wear is the main mode of wear for the low rotational speed pin connections, and the signal strength of the adhesive wear is around 190 times larger than that of abrasive wear. This feasibility study demonstrated that the developed acoustic emission technique can be utilized in the wear monitoring of pin connections in real time in a nondestructive way.

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Section: Introductionmentioning

confidence: 99%

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

et al. 2018

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“…A multivariate Gaussian model was employed to express the probability distribution of the feature matrix. This is given by [17]  …”

Section: ) Breath Sound Trainingmentioning

confidence: 99%

An Inhaler Tracking System Based on Acoustic Analysis: Hardware and Software

Xie

Gaydecki

Caress

2019

IEEE Trans. Instrum. Meas.

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In treating asthma and chronic obstructive pulmonary disorder (COPD), acquisition of authentic and effective feedback from patients on regimen adherence is difficult. Face-to-face and oral reporting methods do not satisfy current intelligent medication best practices. This paper presents a system to track and analyse daily inhaler usage. A portable electronic device that attaches to the inhaler uses an accelerometer and capacitive sensors to detect users' motion and an embedded digital microphone to capture sounds while the inhaler is in use. In terms of analysis, sound features are extracted, and breath phases are identified by employing a hidden Markov model (HMM) with a Gaussian mixture model (GMM). A feature template is also constructed and used to search for and identify 'canister pressed' events. The system provides objective feedback, quantifying asthma and COPD patients' adherence to medication regimens. Although interest in asthma adherence to medication regimens is growing, there is still a relative paucity of research and, indeed, compliance devices in this area; the tracking system can help doctors better understand the patient's condition and choose an appropriated treatment plan. At the same time, patients can also improve their self-management by system feedback.

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“…Acoustic emission (AE) technology is an important means in the field of structural health monitoring (SHM), the integrated SHM system developed in UWA and widely used in many fields such as aerospace industry, material engineering, petrochemical industry, and civil engineering . Defects source localization is an important function AE technology .…”

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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Acoustic emission monitoring of reinforced concrete beams subjected to four-point-bending

Cited by 141 publications

References 27 publications

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

An Inhaler Tracking System Based on Acoustic Analysis: Hardware and Software

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

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