超胞声子晶体板的轻量化设计与研究

由于局域共振型声子晶体板具有优秀的低频声学特性,相关的研究越来越丰富,但多为实验室环境下的研究,对其工程应用方面的轻量化研究存在不足。因此,本文以变电站低频噪声为应用背景,提出一种局域共振型声子晶体板轻量化设计方法。基于此方法,设计出一种针对变电站噪声频谱特性的轻量化超胞声子晶体板。研究发现,此声子晶体板在50 Hz和100 Hz同时具有明显的声传输损失峰,隔声量分别为67 dB和48 dB,并通过振型位移及声压级复合声强流线图对其隔声机理进行了分析研究。本研究对今后声子晶体板的工程应用和变电站噪声控制都具有指导意义。

Lightweight Design and Research of Supercell Phononic Crystal Plate

Due to the excellent low-frequency acoustic characteristics of the local resonance type phononic crystal plate, related research is becoming more and more abundant. However, most of them were research in the laboratory environment, and there were insufficient researches on the lightweight of its engineering application. Therefore, based on the application background of low-frequency noise in substations, a lightweight design method for local resonance phononic crystal panels was proposed in this paper. Based on this method, a lightweight supercell phononic crystal plate for substation noise frequency spectrum characteristics was designed. The study found that this phononic crystal plate has obvious sound transmission loss peaks at 50 Hz and 100 Hz, and the sound insulation is 67 dB and 48 dB respectively. The sound insulation mechanism was analyzed and studied through the composite sound intensity streamline diagram of vibration mode displacement and sound pressure level. The research in this paper has guiding significance for the engineering application of phononic crystal plate and the noise control of substations in the future.