Ultrasonic evaluation of the pitch of periodically rough surfaces from back side

Nguyen, Cuong Tuan; Sugino, Masaki; Kurokawa, Yasuyoshi; Inoue, Hirotsugu

doi:10.1299/mej.17-00278

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…In our previous paper (Nguyen et al, 2017), it was confirmed that the peak frequencies are inversely proportional to the pitch d as shown in Eq. (2), therefore, the pitch d can be evaluated by submitting f n along with its diffracted order n into Eq.…”

Section: Wave Number Analysismentioning

confidence: 57%

“…These are due to combination of different diffraction orders. As discussed in our previous paper (Nguyen et al, 2017), due to pulse-echo configuration, the transducer at large incidence angle, e.g. angles larger than 45º, mainly receives scattering waves.…”

Section: Numerical Resultsmentioning

confidence: 81%

“…It can be observed that larger incidence angle has larger measurable range of the ratio of h/d. However, as the incidence angle increases, the intensity of received signals becomes smaller since effects of multiple scattering and shadowing are important (Nguyen et al, 2017). Therefore, the resolution of measurement also becomes smaller.…”

Section: The Master Curve For Sus304mentioning

confidence: 99%

“…We aimed to develop an ultrasonic characterization method (Nguyen et al, 2017), which differs from previous studies in the way that it enables the direct evaluation of the pitch of inaccessible periodically rough surfaces from back side without immersing in the water. The pitch of periodic surfaces was successfully evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the height of internal periodic triangular surfaces by ultrasonic backscatter

Nguyen

Kurokawa

Inoue

2018

Mechanical Engineering Journal

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Surface texture is an important parameter which affects functions and performance of industrial components. Although stylus and optical techniques are commonly used for evaluating the surface topology, they are applicable only to accessible surfaces. In practice, the geometrical features measurement of inaccessible surfaces from back side is sometimes demanded, for example, in inspection of safety-critical parts such as inner surfaces of pipes. For evaluating such internal surfaces, ultrasonic technique is one of the most effective among others. However, little attention has been paid to the evaluation of inaccessible periodic surfaces so far. In this paper, an ultrasonic pulse-echo technique, namely, master curve technique is developed for evaluating the pitch and the height of periodic triangular surfaces which is inaccessible or hidden on the back side. It is found that 60º of incident angle is appropriate for the development of the master curve equation to compromise between the resolution of measurement and the measurable range of the height-to-pitch ratio. By using P-wave at 60º of incidence angle, the pitch of the surface profile is evaluated from the classical diffraction grating equation, and then the height is evaluated by the master curve equation built from numerical simulation. The validity of the proposed method was verified by both numerical simulation and experiment. It was confirmed that the pitch is accurately measured in most cases. The height was also evaluated with good accuracy when it is smaller than a half of the pitch.

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Section: Wave Number Analysismentioning

confidence: 57%

Section: Numerical Resultsmentioning

confidence: 81%

Section: The Master Curve For Sus304mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the height of internal periodic triangular surfaces by ultrasonic backscatter

Nguyen

Kurokawa

Inoue

2018

Mechanical Engineering Journal

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Ultrasonic examination of a thin, textured metal plate with Penrose tile structure consisting of pitched indentations

2023

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超音波法による潤滑面付着膜厚測定の基礎

TAKEUCHI

2023

Transactions of the JSME (In Japanese)

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In order to obtain the fundamental information for the measurement of thin oil film thickness adhered on lubrication surface using ultrasonic method, the ultrasonic calculation considering the scattering attenuation at each interface and the influence of frequency spectrum of ultrasonic waves were performed. The echo ratio of the wave reflected from the adhered film is hardly affected by the roughness on general lubrication surfaces with Rq≦1μm. On the other hand, the echo ratio is strongly affected by the frequency spectrum, and the relationship between the adhered film thickness and the echo ratio (calibration curve) calculated assuming the center frequency and frequency spectrum of the measured wave almost agrees with the experimental results. Based on the echo ratio distribution measured by the cylinder sliding type oil film thickness observation device, adhered film thickness distribution of the engine cylinder was plotted. Adhered oil film thickness increases and decreases symmetrically on the inlet and outlet sides of the piston ring when the oil supply is sufficient. However, the thickness of the adhered oil film becomes thin and its distribution is flattened throughout the stroke when the oil flow rate is reduced. On the other hand, the relationship between the film thicknesses LA on the cylinder and the film thickness LR on the piston ring for a sufficient oil flow rate is close to the shape of infinity (∞), and adhered film thicknesses of the lower side of top ring (LAT) and of the upper side of second ring (LAS) show a negative correlation. Therefore, these correlations of film thickness behavior have a potential to be one of the indicators of deterioration of lubrication conditions.

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Ultrasonic evaluation of the pitch of periodically rough surfaces from back side

Cited by 4 publications

References 29 publications

Evaluation of the height of internal periodic triangular surfaces by ultrasonic backscatter

Evaluation of the height of internal periodic triangular surfaces by ultrasonic backscatter

Ultrasonic examination of a thin, textured metal plate with Penrose tile structure consisting of pitched indentations

超音波法による潤滑面付着膜厚測定の基礎

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