A Non-linear Acoustic, Vibro-Modulation Technique for the Detection and Monitoring of Contact-type Defects, including those associated with Corrosion

The nondestructive assessment of the damage that occurs in components during service plays a key role for condition monitoring and residual life estimation of in-service components/structures. Ultrasound has been widely utilized for this; however most of these conventional methods using ultrasonic characteristics in the linear elastic region are only sensitive to gross defects but much less sensitive to micro-damage. Recently, the nonlinear ultrasonic technique, which uses nonlinear ultrasonic behavior such as higher-harmonic generation, subharmonic generation, nonlinear resonance, or mixed frequency response, has been studied as a positive method for overcoming this limitation. In this paper, overall progress in this technique is reviewed with the brief introduction of basic principle in the application of each nonlinear ultrasonic phenomenon.

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“…The presence and the level of modulation can be used for damage assessment. 61,[121][122][123][124][125] 6. Current Issues…”

Section: Mixed Frequency Responsementioning

confidence: 99%

Nonlinear ultrasonic techniques for nondestructive assessment of micro damage in material: A review

Jhang

2009

Int. J. Precis. Eng. Manuf.

575

262

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“…Many researchers [14][15][16], proposed health monitoring strategies for the linear-type debond but the nonlinear-type debonds in composite structures are quite complex and difficult to detect using the traditional debond detection strategies [17][18]. These nonlinear-type debond regions can open or close, due to the generation of clapping effect under dynamic loading [19][20].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear elastic wave propagation and breathing-debond identification in a smart composite structure

Sikdar

Paepegem

Ostachowicz

et al. 2020

Composites Part B: Engineering

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“…The use of condition monitoring allows maintenance to be scheduled, or other actions to be taken, in order to avoid the consequences of failure, before it occurs [1]. Different condition monitoring techniques have been suggested for aircraft components [7][8][9][10]. Condition monitoring based on oil analysis is well established [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis and Condition Monitoring of an Open-Loop Oil System Using Ferrography

Levi

Eliaz

2009

Tribol Lett

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Condition monitoring of dynamic systems based on oil analysis is well known for closed-loop systems. The motivation for this work stemmed from repeating failures of Wankel engines. Failure analysis identified contact fatigue as the failure mechanism, but could not identify the cause. Thus, the objective of the work was to develop a method for condition monitoring of open-loop oil systems. A variety of analytical techniques was evaluated, including directreading ferrography, analytical ferrography combined with computational image analysis, atomic emission spectroscopy, and scanning electron microscopy combined with energy dispersive X-ray spectroscopy. Procedures for collection and separation of oil samples were developed. Analytical ferrography was found most useful in condition monitoring. Six engines were detected in their early failure stage. Those engines were disassembled, and contact fatigue failures in the bearing needles were observed. The quantitative image analysis allowed for a fairly objective rating of the wear level. The method developed in this work has already been implemented on a daily basis for monitoring the health of Wankel engines, with much success.

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A Non-linear Acoustic, Vibro-Modulation Technique for the Detection and Monitoring of Contact-type Defects, including those associated with Corrosion

Cited by 9 publications

References 6 publications

Nonlinear ultrasonic techniques for nondestructive assessment of micro damage in material: A review

Nonlinear ultrasonic techniques for nondestructive assessment of micro damage in material: A review

Nonlinear elastic wave propagation and breathing-debond identification in a smart composite structure

Failure Analysis and Condition Monitoring of an Open-Loop Oil System Using Ferrography

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