A restraint structure for a metal hydraulic pipe and a method for extending fatigue life thereof

CN122191397APending Publication Date: 2026-06-12WUHU STATE-OWNED FACTORY OF MACHINING

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: WUHU STATE-OWNED FACTORY OF MACHINING
Filing Date: 2026-01-29
Publication Date: 2026-06-12

AI Technical Summary

Technical Problem

Traditional clamp restraint structures have weak resonance suppression capabilities in metal hydraulic pipelines, energy concentration leads to short fatigue life, poor flow velocity adaptability, and cannot effectively control antisymmetric resonance modes, resulting in a high risk of flight control failure.

Method used

A double-layer quasi-zero stiffness constraint structure was designed. Combining fluid-structure interaction theory and fatigue crack propagation theory, resonance suppression and fatigue life extension of the nonlinear dynamic model were achieved by adjusting the constraint position and damping stiffness.

Benefits of technology

It significantly suppresses resonance response, reduces dynamic stress amplitude, extends fatigue life by more than double, adapts to high dynamic excitation and flow rate changes, and ensures the operational reliability of metal hydraulic pipelines.

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Abstract

The application discloses a constraint structure for a metal hydraulic pipeline and a fatigue life prolonging method thereof, and belongs to the technical field of flow pipeline vibration reduction and fatigue resistance in mechanical engineering. The constraint structure comprises a rigid base, a mass block, a first damper, a second damper, a first vertical spring, a second vertical spring, a first pair of horizontal springs and a second pair of horizontal springs. One end of the first vertical spring is connected to the rigid base, and the other end is connected to the bottom of the mass block. The first damper is connected in parallel with the first vertical spring. One end of the second vertical spring is connected to the top of the mass block, and the other end is used for connecting a preset constraint position on the metal hydraulic pipeline. The second damper is connected in parallel with the second vertical spring. According to the application, a double-layer quasi-zero stiffness constraint structure is designed, and a life regulation method based on the fluid-solid coupling theory and the fatigue crack propagation theory is combined, so that the vibration of the metal hydraulic pipeline is inhibited and the fatigue life is prolonged.

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