Design and vibration reduction characteristic of rotating unit-type perforated meta-structures
YAN Shiguang1,2，LI Yingli1,3，YIN Guohui1，YAO Song1
1. Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China;
2. SAIC Innovation Research and Development Institute, Shanghai 201804, China;
3. National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha 410075, China
Abstract：A class of perforated meta-structures with rotating units is proposed for the engineering demand of high-speed train floor vibration reduction, including quadrilateral element with staggered rectangular hole, quadrilateral element with cross rectangular hole and triangular element with polygonal hole. The mechanism of bandgap and the regulation law of parameters are analyzed by using Bloch theory and numerical simulation. Then according to the results of meta-structures band gap analysis, the 3D block meta-structure is established, including quadrilateral element with staggered rectangular hole, quadrilateral element with cross rectangular hole and triangle element with 45 degree concave polygonal hole. The bearing performance of block meta-structure is analyzed, and the vibration responses under different configurations are calculated to determine the optimal configuration based on the numerical analysis results of the damping characteristics. Then, 3D-printed samples are prepared and vibration tests are carried out to verify the vibration reduction effect of the structure. The results show that when using TPU material, the proposed superstructure damping blocks all meet the requirements of bearing capacity and strength. Among them, the meta-structure with polygonal hole and triangular element is the optimal configuration, and its attenuation range accounts for 66.9% in the frequency range of 0-5000Hz. Through the vibration test, it is found that, compared with the existing EMU (Electric Multiple Unit) absorber, the meta-structure with polygonal hole and triangular element has a wider attenuation range frequency, a greater attenuation amplitude of more than -15dB, and a better vibration reduction effect, which indicates its potential application prospect of train floor.
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