1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China 2. Key Laboratory of Vibration and Control of Aero-Propulsion Systems (Ministry of Education), Northeastern University, Shenyang 110819, China 3. College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
The efficient dynamic modeling and vibration transfer analysis of a fluid-delivering branch pipeline (FDBP) are essential for analyzing vibration coupling effects and implementing vibration reduction optimization. Therefore, this study proposes a reduced-order dynamic modeling method suitable for FDBPs and then analyzes the vibration transfer characteristics. For the modeling method, the finite element method and absorbing transfer matrix method (ATMM) are integrated, considering the fluid–structure coupling effect and fluid disturbances. The dual-domain dynamic substructure method is developed to perform the reduced-order modeling of FDBP, and ATMM is adopted to reduce the matrix order when solving fluid disturbances. Furthermore, the modeling method is validated by experiments on an H-shaped branch pipeline. Finally, transient and steady-state vibration transfer analyses of FDBP are performed, and the effects of branch locations on natural characteristics and vibration transfer behavior are analyzed. Results show that transient vibration transfer represents the transfer and conversion of the kinematic, strain, and damping energies, while steady-state vibration transfer characteristics are related to the vibration mode. In addition, multiple-order mode exchanges are triggered when branch locations vary in frequency-shift regions, and the mode-exchange regions are also the transformation ones for vibration transfer patterns.
Transfer matrix between the master and slave branches
b
Number of boundary DOFs
Cr, c
Damping matrices of the structure and fluid, respectively
fx, fy, fz
External forces at a position in the x, y, and z directions, respectively
f
Natural frequency
Gc, G
Constraint matrix and transformation matrix, respectively
Number of internal DOFs
Ii(t)
Structural intensity response
, , , K
Stiffness matrices of the pipeline, fluid, coupling element, and pipeline system, respectively
Reduced stiffness matrix
M(n − 1)
General transfer matrices used in TMM
, ,
Mass matrices of the pipeline, fluid, and pipeline system, respectively
mx, my, mz
External moments at a position in the x, y, and z directions, respectively
Reduced mass matrix
Pf
Fluid pressure
Reduced external force
Transfer matrix used in TMM
External excitation vector used in TMM
Amplitudes of the velocity responses
, ,
Velocity responses at a position in the x, y, and z directions, respectively
un
Node displacement response
,
Steady-state velocity and stress
Vf
Fluid velocity
, ,
CRs of kinetic, strain, and damping energies, respectively
x
Reduced DOFs
Time-domain state vectors
, , ,
Coefficient matrices used in TMM
, ,
Angular velocity responses at a position in the x, y, and z directions, respectively
Frequency-domain state vectors
Amplitudes of stress responses
σ
Stress response
ψ, γ
Phase angles of stress and velocity responses, respectively
ω
Angular frequency
Ξ
State matrix of the branch
ξ1, ξ2
First- and second-order damping ratios, respectively
1
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