Characterization of contact condition in a flange connection by longitudinal waves
The integrity of flange joints is critical in all pipe systems. To test this integrity, an ultrasonic method characterizing the condition of the flange joint would be a vital tool. In this study, we analyzed the contact conditions on a metal/gasket/metal connection. The instantaneous frequency profi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2018-02-01
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| Series: | Mechanical Engineering Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/mej/5/2/5_17-00568/_pdf/-char/en |
| _version_ | 1818840112556933120 |
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| author | Hideo CHO Kanami YAMAMOTO Kojiro NISHIMIYA Hiroaki ITO |
| author_facet | Hideo CHO Kanami YAMAMOTO Kojiro NISHIMIYA Hiroaki ITO |
| author_sort | Hideo CHO |
| collection | DOAJ |
| description | The integrity of flange joints is critical in all pipe systems. To test this integrity, an ultrasonic method characterizing the condition of the flange joint would be a vital tool. In this study, we analyzed the contact conditions on a metal/gasket/metal connection. The instantaneous frequency profile, i.e., the phase change of the wave with time for longitudinal waves transmitted in an Al alloy/gasket/Al alloy system, was evaluated under various contact pressures. The instantaneous frequency (IF) was calculated with a complex continuous wavelet transform with a modified Morlet function as a mother wavelet. The maximum IF of the waves monotonically increased with contact pressure, showing similar properties as the amplitude of the waves. A one-dimensional numerical calculation with a finite difference time domain method with a spring condition for expressing various contact conditions or contact stiffness revealed that a large phase delay of the transmission wave was generated at a low contact stiffness interface, and the amount of delay was correlated with the contact stiffness. On the other hand, the delay in the reflected wave was very small. |
| first_indexed | 2024-12-19T04:05:00Z |
| format | Article |
| id | doaj.art-af3df2f32da14262ba5b17ad3b6418ce |
| institution | Directory Open Access Journal |
| issn | 2187-9745 |
| language | English |
| last_indexed | 2024-12-19T04:05:00Z |
| publishDate | 2018-02-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Mechanical Engineering Journal |
| spelling | doaj.art-af3df2f32da14262ba5b17ad3b6418ce2022-12-21T20:36:33ZengThe Japan Society of Mechanical EngineersMechanical Engineering Journal2187-97452018-02-015217-0056817-0056810.1299/mej.17-00568mejCharacterization of contact condition in a flange connection by longitudinal wavesHideo CHO0Kanami YAMAMOTO1Kojiro NISHIMIYA2Hiroaki ITO3Collage of Science and Engineering, Aoyama Gakuin UniversityCollage of Science and Engineering, Aoyama Gakuin UniversityCollage of Science and Engineering, Aoyama Gakuin UniversityFaculty of Engineering, Kindai UniversityThe integrity of flange joints is critical in all pipe systems. To test this integrity, an ultrasonic method characterizing the condition of the flange joint would be a vital tool. In this study, we analyzed the contact conditions on a metal/gasket/metal connection. The instantaneous frequency profile, i.e., the phase change of the wave with time for longitudinal waves transmitted in an Al alloy/gasket/Al alloy system, was evaluated under various contact pressures. The instantaneous frequency (IF) was calculated with a complex continuous wavelet transform with a modified Morlet function as a mother wavelet. The maximum IF of the waves monotonically increased with contact pressure, showing similar properties as the amplitude of the waves. A one-dimensional numerical calculation with a finite difference time domain method with a spring condition for expressing various contact conditions or contact stiffness revealed that a large phase delay of the transmission wave was generated at a low contact stiffness interface, and the amount of delay was correlated with the contact stiffness. On the other hand, the delay in the reflected wave was very small.https://www.jstage.jst.go.jp/article/mej/5/2/5_17-00568/_pdf/-char/encontact conditioninstantaneous frequencyultrasonic measurementnumerical calculation |
| spellingShingle | Hideo CHO Kanami YAMAMOTO Kojiro NISHIMIYA Hiroaki ITO Characterization of contact condition in a flange connection by longitudinal waves Mechanical Engineering Journal contact condition instantaneous frequency ultrasonic measurement numerical calculation |
| title | Characterization of contact condition in a flange connection by longitudinal waves |
| title_full | Characterization of contact condition in a flange connection by longitudinal waves |
| title_fullStr | Characterization of contact condition in a flange connection by longitudinal waves |
| title_full_unstemmed | Characterization of contact condition in a flange connection by longitudinal waves |
| title_short | Characterization of contact condition in a flange connection by longitudinal waves |
| title_sort | characterization of contact condition in a flange connection by longitudinal waves |
| topic | contact condition instantaneous frequency ultrasonic measurement numerical calculation |
| url | https://www.jstage.jst.go.jp/article/mej/5/2/5_17-00568/_pdf/-char/en |
| work_keys_str_mv | AT hideocho characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves AT kanamiyamamoto characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves AT kojironishimiya characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves AT hiroakiito characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves |