Research on vibration property of periodic pipeline system
Pipeline systems are widely used in ship power,marine engineering,building environment and other fields.Its vibration and noise may lead to equipment failure and destruction.The periodic structural design with elastic wave bandgap characteristics can achieve artificial modulation of waves within specific frequency bands,effectively reducing low-frequency vibration noise of pipeline structures.The periodic structure is introduced into the one-dimensional pipeline,and based on the two band gap mechanisms of Bragg scattering and local resonance,the periodic pipeline structure with good damping property in the whole frequency band is designed.Combining the transfer-matrix method and the finite element method,the bandgap and vibration reduction property of the Bragg type pipeline are calculated.The finite element model of periodic pipeline with local resonance element is established,and the influence of Lattice constant,number of periods,local vibrator size and other parameters on the vibration characteristics of periodic pipeline structure is calculated and analyzed.The results show that the periodic pipeline system designed based on the property of phononic crystal band gap has excellent vibration reduction performance.
periodic structureband gap mechanismpipeline systemphononic crystalsvibration property
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