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Dynamics of fluid-conveying piping system containing a short threaded joint

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Abstract

The dynamics of a cantilevered fluid-conveying straight piping system composed of a left pipe, a right pipe and a short threaded joint implemented intermediately is investigated. First of all, the flow-induced equation of motion is deduced with the consideration of rotatory inertia as well as flexural stiffness of the joint, where the joint is treated as a segment of pipe according to the principle of equivalent substitution and a regulatory factor is introduced to represent the reduction of flexural stiffness at the joint. Secondly, DTM-Galerkin (Galerkin’s method whose shape functions are derived by differential transformation) is employed to discretize the above equation of motion, and the eigenfunction for calculating the piping system’s natural frequency is obtained. Finally, influences of some vital parameters including regulatory factor, length of the left pipe and rotatory inertia of the joint on the piping system’s dynamics are studied under given conditions. The research proposes an equivalent method to study the influence of short threaded joint on the pipe dynamics, which has reference meaning on the experimental research about the impact of threaded joint on pipe dynamics, especially in curve fitting when studying the dynamic characteristics of pipes, and can be radiated to study other connection forms in piping system.

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Abbreviations

d i :

Inner radius of two pipes and the equivalent joint

d o :

Outer radius of two pipes

D o :

Outer radius of the equivalent joint

w :

Lateral displacement

x :

Horizontal coordinate

t :

Time

L 1 :

Length of the left pipe

L 2 :

Total length of the left pipe and the joint

L :

Total length of the whole piping system

E p :

Elastic modulus of two pipes

ρ p :

Density of two pipes

A p :

Cross-section area of two pipes, \(A_{{\text{p}}} = \pi (d_{{\text{o}}}^{2} - d_{{\text{i}}}^{2} )/4\)

m p :

Mass per unit length of two pipes, \(m_{{\text{p}}} = \rho_{{\text{p}}} A_{{\text{p}}}\)

I p :

Cross-section moment of inertia of two pipes, \(I_{{\text{p}}} = \pi (d_{{\text{o}}}^{4} - d_{{\text{i}}}^{4} )/64\)

E j :

Elastic modulus of the equivalent joint

ρ j :

Density of the equivalent joint

A j :

Cross-section area of the equivalent joint, \(A_{{\text{j}}} = \pi (D_{{\text{o}}}^{2} - d_{{\text{i}}}^{2} )/4\)

m j :

Mass per unit length of the equivalent joint, \(m_{{\text{j}}} = \rho_{{\text{j}}} A_{{\text{j}}}\)

I j :

Cross-section moment of inertia of the equivalent joint, \(I_{{\text{j}}} = \pi (D_{{\text{o}}}^{4} - d_{{\text{i}}}^{4} )/64\)

J j :

Rotatory inertia per unit length of the equivalent joint

ρ f :

Density of fluid

A f :

Cross-section area of fluid, \(A_{{\text{f}}} = \pi d_{{\text{i}}}^{2} /4\)

m f :

Mass per unit length of fluid, \(m_{{\text{f}}} = \rho_{{\text{f}}} A_{{\text{f}}}\)

U :

Cross-section average flow velocity

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Acknowledgements

This work was supported by the General Project of Basic Science (Natural Science) Research in Colleges and Universities of Jiangsu Province (No. 22KJD130001); the Changzhou Science and Technology Plan Project (No. CJ20220017); Research Science and Technology Project of Special Equipment Safety Supervision Inspection Institute of Jiangsu Province (No. KJ(Y) 2023031) and the Changzhou University Higher Vocational Education Research Project (No. CDGZ2019010). The authors want to thank the anonymous referees for their valuable suggestions and comments.

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Zhao, Q., Liu, W., Cai, F. et al. Dynamics of fluid-conveying piping system containing a short threaded joint. J Braz. Soc. Mech. Sci. Eng. 45, 636 (2023). https://doi.org/10.1007/s40430-023-04547-6

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