Damage detection in pipes based on acoustic excitations using laser-induced plasma

Kajiwara, Itsuro; Akita, Ryosuke; Hosoya, Naoki

doi:10.1016/j.ymssp.2018.04.004

Cited by 24 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This shock wave is applied to a test piece as an impulse excitation force. The LIP shock wave excitation technique has been widely developed for assessments or non-destructive inspections of the dynamic characteristics of mechanical structures as well as for the generation of a point sound source [ 34 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Soft Mango Firmness Assessment Based on Rayleigh Waves Generated by a Laser-Induced Plasma Shock Wave Technique

Arai

Miyake

Yamamoto

et al. 2021

Foods

Self Cite

View full text Add to dashboard Cite

Many methods based on acoustic vibration characteristics have been studied to indirectly assess fruit ripeness via fruit firmness. Among these, the frequency of the 0S2 vibration mode measured on the equator has been examined, but soft-flesh fruit do not show the 0S2 vibration mode. In this study, a Rayleigh wave is generated on a soft mango fruit using the impulse excitation force generated by a laser-induced plasma shock wave technique. Then, the flesh firmness of mangoes is assessed in a non-contact and non-destructive manner by observing the Rayleigh wave propagation velocity because it is correlated with the firmness (shear elasticity), density, and Poisson’s ratio of an object. If the changes in the density and Poisson’s ratio are small enough to be ignored during storage, then the Rayleigh wave propagation velocity is strongly correlated to fruit firmness. Here, we measure the Rayleigh wave propagation velocity and investigate the effect of storage time. Specifically, we investigate the changes in firmness caused by ripening. The Rayleigh wave propagation velocity on the equator of Kent mangoes tended to decrease by over 4% in 96 h. The Rayleigh wave measured on two different lines propagated independent distance and showed a different change rate of propagation velocity during 96-h storage. Furthermore, we consider the reliability of our method by investigating the interaction of a mango seed on the Rayleigh wave propagation velocity.

show abstract

Section: Introductionmentioning

confidence: 99%

Soft Mango Firmness Assessment Based on Rayleigh Waves Generated by a Laser-Induced Plasma Shock Wave Technique

Arai

Miyake

Yamamoto

et al. 2021

Foods

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, we conclude that our method can be used to determine the clamping force of bolted joints with bolt sizes of M6 or larger. If a non-contact excitation technique based on laser ablation [26,[29][30][31][32][33][34][35][36] or laser-induced plasma shock wave [37][38][39][40][41][42][43][44][45][46][47] can be used to excite target bolted joints for high frequency region over 40 kHz, a clamping force detection for miniature bolted joints may be realized. Next, we conduct experimental modal analysis to determine whether the natural frequencies that show changes in Fig.…”

Section: Frf Measurementsmentioning

confidence: 99%

Evaluation of the Clamping Force of Bolted Joints Using Local Mode Characteristics of a Bolt Head

et al. 2018

Self Cite

View full text Add to dashboard Cite

It is important to determine and control the clamping force of a bolted joint. Due to its simple setup, the torque control method is typically used to control the clamping force when tightening bolts. After tightening, hammer tests, ultrasonic techniques and methods employing sheet materials as sensors are often used. Many methods have been proposed, but using them to determine and control the clamping force during or after tightening bolts is labor intensive or expensive. Here we conduct impact tests with an impulse hammer combined with experimental modal analysis to determine the clamping force by interpreting the change in the local mode frequency of a bolt head in the high frequency region as a function of the clamping force. To demonstrate the applicability of our method, we also investigate its limits with regard to bolt sizes. Keywords Vibration • Non-destructive testing • Clamping force • Bolted joint • Experimental modal analysis IntroductionMultiple bolts are often used to join or restrain the components of a structure. Because loosening of these bolts may damage the structure, it is important to be able to monitor and control the clamping force of bolted joints [1]. Methods Naoki Hosoya B

show abstract

“…Probably, the newest method for detecting a crack with acoustic means was reported in [14]. The experiment was made on a pipe with a drilled hole, as artificial crack, to which an acoustic non-contact excitation was applied by help of laser-induced plasma (LIP) in air.…”

Section: Acoustic Detection Of Cracks and Corrosionmentioning

confidence: 99%

Pipe Cracks Detection Methods – A Review

2018

IJOMAM

View full text Add to dashboard Cite

A comparison between the most important methods for crack detection during external inspection of the pipes is presented. It is meant to choose the best suited one for robotic devices, aimed to perform the pipelines monitoring, because they are often under the action of the environmental stress factors, like high-temperature variation, especially met in the Middle East countries. As a native from the Republic of Iraq, the first author currently works at development of a robot for external inspection of pipes, within his PhD thesis, in order to provide full care to the pipelines, because they are non-replaceable. This way, their performance and reliability can improved and the production stopping is prevented.

show abstract

Damage detection in pipes based on acoustic excitations using laser-induced plasma

Cited by 24 publications

References 33 publications

Soft Mango Firmness Assessment Based on Rayleigh Waves Generated by a Laser-Induced Plasma Shock Wave Technique

Soft Mango Firmness Assessment Based on Rayleigh Waves Generated by a Laser-Induced Plasma Shock Wave Technique

Evaluation of the Clamping Force of Bolted Joints Using Local Mode Characteristics of a Bolt Head

Pipe Cracks Detection Methods – A Review

Contact Info

Product

Resources

About