2012 Fiscal Year Final Research Report
Estimation of surface pressure on a flange connection using non-linear ultrasonics
| Project/Area Number |
22560728
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Aoyama Gakuin University |
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Principal Investigator |
CHO Hideo 青山学院大学, 理工学部, 准教授 (60296382)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 非破壊検査 |
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| Research Abstract |
For estimating surface pressure on a flange connection, non-linear ultrasonics and transmission coefficient of longitudinal wave propagating through an contacting interface were utilized. In a non-linear ultrasonic measurement on which double frequency of the incident longitudinal waves (second harmonic waves) to an interface was obtained, it is confirmed that a generation coefficient of the second harmonic waves related to surface pressure on a contacting interface. Distribution of the surface pressure can be estimated by using generation coefficient of the second harmonic waves. On the other hand, it is confirmed that the transmission coefficient on higher frequency component decreased as the surface pressure decreased. With frequency dependence of the transmission coefficient, the surface pressure can be obtained in a wide pressure range.
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