Measurement of small rotation angle of flange joints by a novel flexure magnifying mechanism

Xiaotao Zheng, Fen Wei, Haofeng Chen, Sujuan Guo, Fuzhen Xuan

Research output: Contribution to journalArticle

Abstract

Bolted flange joints are indispensable components in process industries due to the good sealing, assemble and disassemble capacities. Generally, the flange rigidity characterized by the rotation angle is a key index to evaluate the sealing tightness of flange joints. However, the rotation angle of flange is usually too small (less than 1º) to monitor during the assemble and operation stages. Accordingly, a novel flexure magnifying mechanism is designed to measure the small rotation angle of flange joints under internal pressure and external bending moment. The magnification factor and calculation approach of the flexure amplification mechanism are deduced and verified by experimental data and finite element simulation. Results indicate that the proposed measuring apparatus has good performance to monitor the maximum rotation angle. It is of great interest that the measured location of the maximum rotation angle is in good agreement with that in the experiment, and the average error is 7.3%, which is acceptable for practical application. Additionally, the leakage rate at the top of flange joints slowly and almost linearly increases with the increment of external bending moment ascribing to the decrease the gasket stress near the top of flange joints.
LanguageEnglish
Number of pages25
JournalMeasurement
Publication statusAccepted/In press - 26 May 2019

Fingerprint

flanges
flexing
Flanges
bending moments
sealing
Bending moments
tightness
internal pressure
magnification
rigidity
Rigidity
Amplification
leakage
industries

Keywords

  • flexure magnifying mechanism
  • flange joints
  • measurement
  • rotation angle
  • leakage rate

Cite this

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title = "Measurement of small rotation angle of flange joints by a novel flexure magnifying mechanism",
abstract = "Bolted flange joints are indispensable components in process industries due to the good sealing, assemble and disassemble capacities. Generally, the flange rigidity characterized by the rotation angle is a key index to evaluate the sealing tightness of flange joints. However, the rotation angle of flange is usually too small (less than 1º) to monitor during the assemble and operation stages. Accordingly, a novel flexure magnifying mechanism is designed to measure the small rotation angle of flange joints under internal pressure and external bending moment. The magnification factor and calculation approach of the flexure amplification mechanism are deduced and verified by experimental data and finite element simulation. Results indicate that the proposed measuring apparatus has good performance to monitor the maximum rotation angle. It is of great interest that the measured location of the maximum rotation angle is in good agreement with that in the experiment, and the average error is 7.3{\%}, which is acceptable for practical application. Additionally, the leakage rate at the top of flange joints slowly and almost linearly increases with the increment of external bending moment ascribing to the decrease the gasket stress near the top of flange joints.",
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author = "Xiaotao Zheng and Fen Wei and Haofeng Chen and Sujuan Guo and Fuzhen Xuan",
year = "2019",
month = "5",
day = "26",
language = "English",
journal = "Measurement: Journal of the International Measurement Confederation",
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Measurement of small rotation angle of flange joints by a novel flexure magnifying mechanism. / Zheng, Xiaotao; Wei, Fen; Chen, Haofeng; Guo, Sujuan; Xuan, Fuzhen.

In: Measurement, 26.05.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measurement of small rotation angle of flange joints by a novel flexure magnifying mechanism

AU - Zheng, Xiaotao

AU - Wei, Fen

AU - Chen, Haofeng

AU - Guo, Sujuan

AU - Xuan, Fuzhen

PY - 2019/5/26

Y1 - 2019/5/26

N2 - Bolted flange joints are indispensable components in process industries due to the good sealing, assemble and disassemble capacities. Generally, the flange rigidity characterized by the rotation angle is a key index to evaluate the sealing tightness of flange joints. However, the rotation angle of flange is usually too small (less than 1º) to monitor during the assemble and operation stages. Accordingly, a novel flexure magnifying mechanism is designed to measure the small rotation angle of flange joints under internal pressure and external bending moment. The magnification factor and calculation approach of the flexure amplification mechanism are deduced and verified by experimental data and finite element simulation. Results indicate that the proposed measuring apparatus has good performance to monitor the maximum rotation angle. It is of great interest that the measured location of the maximum rotation angle is in good agreement with that in the experiment, and the average error is 7.3%, which is acceptable for practical application. Additionally, the leakage rate at the top of flange joints slowly and almost linearly increases with the increment of external bending moment ascribing to the decrease the gasket stress near the top of flange joints.

AB - Bolted flange joints are indispensable components in process industries due to the good sealing, assemble and disassemble capacities. Generally, the flange rigidity characterized by the rotation angle is a key index to evaluate the sealing tightness of flange joints. However, the rotation angle of flange is usually too small (less than 1º) to monitor during the assemble and operation stages. Accordingly, a novel flexure magnifying mechanism is designed to measure the small rotation angle of flange joints under internal pressure and external bending moment. The magnification factor and calculation approach of the flexure amplification mechanism are deduced and verified by experimental data and finite element simulation. Results indicate that the proposed measuring apparatus has good performance to monitor the maximum rotation angle. It is of great interest that the measured location of the maximum rotation angle is in good agreement with that in the experiment, and the average error is 7.3%, which is acceptable for practical application. Additionally, the leakage rate at the top of flange joints slowly and almost linearly increases with the increment of external bending moment ascribing to the decrease the gasket stress near the top of flange joints.

KW - flexure magnifying mechanism

KW - flange joints

KW - measurement

KW - rotation angle

KW - leakage rate

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