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Quantitative roughness characterization of non-gaussian random rough surfaces by ultrasonic method using pitch-catch and pulse-echo configurations

Saniman, ‪Muhammad Nur Farhan and Abd Wahid, Khairul Anuar and Mohd Foudzi, Farhana and Hela Ladin, Hilmi and Ihara, Ikuo (2020) Quantitative roughness characterization of non-gaussian random rough surfaces by ultrasonic method using pitch-catch and pulse-echo configurations. International Journal of Mechanical and Mechatronics Engineering, 20 (1). pp. 80-87. ISSN 22272771

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Abstract

Fundamental study to quantitatively evaluate not only the root-mean-square (rms) roughness Rq but also skewness Rsk of non-Gaussian random rough surfaces by ultrasonic method is presented. In this work, Johnson distribution together with Kirchhoff theory have been employed to derive a newly proposed Johnson characteristic function, which provides a theoretical relationship among ultrasonic reflection coefficient, Rq and Rsk. Based on the characteristics of such relationship, an effective ultrasonic measurement method consisting of a pitch-catch and a pulse-echo configuration to quantitatively characterize Rq and Rsk has been proposed. A general guideline for such characterization method has also been suggested. The validation of the proposed method has then been conducted numerically in the case of an air-coupled ultrasound. Good agreements between the numerically estimated Rq and Rsk and the corresponding reference values thus confirm the validity of the proposed method

Item Type: Article (Journal)
Uncontrolled Keywords: Johnson characteristic function, Kirchhoff theory, non-Gaussian, skewness, surface roughness, ultrasonic
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Suhani Saarani
Date Deposited: 01 Feb 2021 11:29
Last Modified: 01 Feb 2021 11:29
URI: http://irep.iium.edu.my/id/eprint/88169

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