Abstract:In this paper, a new type of phononic crystal with multiopening locally resonant structure is designed in this paper. Based on the finite element method, the band gap generation mechanism and vibration characteristics of the designed structure are calculated and analyzed, and the influencing factors of the band gap are further analyzed. It is shown that, compared with the conventional fully connected structure, the proposed unit structure is lighter in weight and can generate much wider band gap in the range of 40.8 Hz to 256.7 Hz, and the band gap width is 215.9 Hz, accounting for 92.95% of the whole low frequency range. By further optimizing the structural parameters, the start frequency of the first bandgap can be as low as 36.1 Hz and the bandwidth is 174.1 Hz. This new type multiopening locally resonant structure can achieve the purpose of lower in weight and wider band gap in low frequency at the same time, thus has potential application prospects for lowfrequency noise reduction of cabins in the aircraft, submarines and the like.