Nalysis of Vibration Isolation Performance of Quasi-zero Stiffness Isolator for Multi-Span Pipes Conveying Fluid
Under low-frequency excitations,vibration of pipes conveying fluid can lead to fatigue and structural damage.To overcome limitations arising from the frequency band and load capacity of linear viscoelastic isolators,a solution involving non-linear quasi-zero-stiffness isolators constructed with damping and springs is proposed.These isolators aim to control the vibrations of multi-span pipes conveying fluid,particularly focusing on low-frequency isolation.The Hamiltonian variational principle is employed to es-tablish partial differential equations for multi-span pipelines with and without isolators.The Galerkin method and the Runge-Kutta method are applied for numerical solutions.An analysis of the impact of quasi-zero-stiffness isolators on the multi-mode vibrations of fluid-conveying pipelines is conducted.The performance of the isolators is assessed using the absolute motion transmissibility and compared with linear viscoelastic isolators.Results indicate that both quasi-zero-stiffness and linear viscoelastic isolators exhibit fa-vorable performance in the high-frequency region for multi-span fluid conveying pipelines.But in the low-frequency range,the for-mer exhibits superior isolation performance.The device can be applied to the vibration isolation of long-distance continuous multi-span transmission pipelines.
quasi-zero stiffnessmulti-spanisolation in low frequency regionsfluid-conveying pipe
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