【摘要】 采用声传递理论及其研究方法,对无限和有限周期一维二组元声子晶体进行理论研究,推导出其模拟方程,在此基础上进行了计算机模拟研究,并通过实验进行了验证。结果显示,无限周期的带隙和有限周期的禁带表现出很好的相适应性,有限周期的模拟结果与实验结果表现出一致性,表明布拉格散射能够很好地解释有限周期的隔声降噪机理。更多还原

【Abstract】 Using theories and research methods for sound transmission,the infinite and finite periodic 1D two-component phononic crystals were studied,and the analog equations were derived.Then the computer simulations were carried out and the results were verified through experiments.The investigation indicated the suitability of the bandgap of the infinite periodic phononic crystal to the forbidden gap of the finite periodic phononic crystal,and the consistency between the simulated and experimental results,which inferred that the Bragg scattering can explain the finite periodic sound insulation.更多还原