Abstract
The transmission of vibration waves in specific frequency bands can be suppressed by the local resonance and the multi-layer transmission structure. A composite non-periodic isolator containing a local resonance structure is proposed in this paper. The transmission performance of vibration waves is studied using the modal displacement, and the main vibration control frequency band is picked up for vibration wave transmission. Meanwhile, the total power distribution, frequency quality loss factor and total power loss density are calculated in main frequency band. Further, the energy transmission and loss performance of vibration waves are studied in the composite non-periodic isolator. The transmission ratio of the vibration wave is also discussed, the evolution of the vibration transmission ratio is compared in each metal frame of the composite non-periodic isolator, and the vibration isolation performance is evaluated. Research shows that the vibration isolation energy can be effectively increased and the vibration isolation performance can be effectively improved in the proposed composite non-periodic isolator.
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