Simplified description of in-plane bending mode of cylindrical shell using two-dimensional ring model

Inoue, Hirofumi; Takata, Soichiro; Shinoda, Shigeki

doi:10.1299/jsmesed.2017.16.109

Cited by 2 publications

(1 citation statement)

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“…Ideal piping has uniform pipe thickness; but in actual cases, pipe thickness is not uniform due to process variations. Therefore, the average pipe thickness

is given as follows [ 34 ]:

…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Pipe Thickness by Magnetic Hammer Test with a Tunnel Magnetoresistive Sensor

Ito,

Igarashi,

Odagiri

et al. 2024

Sensors

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A new nondestructive inspection method, the magnetic hammer test (MHT), which uses a compact and highly sensitive tunnel magnetoresistance (TMR) sensor, is proposed. This method complements the magnetic flux leakage method and eliminates the issues of the hammer test. It can therefore detect weak magnetic fields generated by the natural vibration of a pipe with a high signal-to-noise ratio. In this study, several steel pipes with different wall thicknesses were measured using a TMR sensor to demonstrate the superiority of MHT. The results of the measurement show that wall thickness can be evaluated with the accuracy of several tens of microns from the change in the natural vibration frequency of the specimen pipe. The pipes were also inspected underwater using a waterproofed TMR sensor, which demonstrated an accuracy of less than 100 μm. The validity of these results was by simulating the shielding of magnetic fields and vibration of the pipes with the finite element method (FEM) analysis. The proposed noncontact, fast, and accurate method for thickness testing of long-distance pipes will contribute to unmanned, manpower-saving nondestructive testing (NDT) in the future.

show abstract

“…Ideal piping has uniform pipe thickness; but in actual cases, pipe thickness is not uniform due to process variations. Therefore, the average pipe thickness

is given as follows [ 34 ]:

…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Pipe Thickness by Magnetic Hammer Test with a Tunnel Magnetoresistive Sensor

Ito,

Igarashi,

Odagiri

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

Proposal of the pipe diagnosis method using in-plane bending vibration of cylindrical shell

Takata

Inoue

Shinoda

2018

Transactions of the JSME (In Japanese)

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In this paper, deterioration diagnosis for distribution main pipe was studied using the uniform cylindrical shell approximation and in-plane bending mode. The in-plane bending mode is expected to have high accuracy in detection of deterioration, because the eigen frecuency of the mode is proportional to pipe thickness. First, using the finite element method, the characteristics of in-plane bending mode are investigated. It is confirmed that in-plane bending mode has little small dependence on the pipe length and the boundary conditions at the pipe ends, it appears in the audio frequency bands, and it has linear dependence on the pipe thickness. In addition, formula with two dimensional ring approximation is derived. Moreover, the average thickness and the uniform-cylindrical shell approximation are introduced for deal with the deteriorated pipe. Using the thinning pipe thickness of previous study, validity of the average thickness and the uniform-cylindrical shell approximation were confirmed. On the other hand, actual pipeline has the sub-structure, for example, valve, hydrant, and so on. In order to deal with the coupled vibration between the cylindrical shell and the sub-structure, eigenvalue analysis are conducted using the Semi-Analytical Receptance Method (SARM). The experimental consideration were conducted in case of that the sub-structure non-attached case. The in-plane bending mode is observed experimentally on the actual pipe system and its resonant frequency shows good match with the theoretical values.

show abstract

Simplified description of in-plane bending mode of cylindrical shell using two-dimensional ring model

Cited by 2 publications

References 0 publications

Evaluation of Pipe Thickness by Magnetic Hammer Test with a Tunnel Magnetoresistive Sensor

Evaluation of Pipe Thickness by Magnetic Hammer Test with a Tunnel Magnetoresistive Sensor

Proposal of the pipe diagnosis method using in-plane bending vibration of cylindrical shell

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