The chiral structure has unique band gap characteristics and plays an important role in vibration reduction. Band gap adjustment of low frequency and broad bandwidth is a hotspot in engineering. An improved three-ligament chiral structure with flexure hinges is presented. Flexure hinges are placed on each ligament. The band gap characteristic of the structure is excellent and can be improved by only adjusting geometric parameters of flexure hinges. This characteristic has unique advantages for vibration reduction conditions with spatial limitation. The band gap characteristics of the improved structure are studied by finite element method and vibration tests. The numerical and experimental results indicate that the attenuation zone of the improved structure is greater than for the common three-ligament chiral structure. Furthermore, configuration and dimensions of the three-ligament chiral structure, such as radius and central angle of the notch arc, quantity of arc flexure hinges, and the distance between centers of the notch arc of two flexure hinges, have significant effects on the frequency response characteristics. The quantity of arc flexure hinges has the greatest impact on the frequency response. The results of this paper can assist with the band gap adjustment of chiral structures in engineering.
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