【作者】 衣晓锋； 彭大勇； 曾娟； 马力；

【Author】 YI Xiao-feng;PENG Da-yong;ZENG Juan;MA Li;Institute of Acoustics,Chinese Acdemy of Sciences;Key Laboratory of Underwater Acoustic Environment,Chinese Acdemy of Sciences;University of Chinese Academy of Sciences;

【机构】 中国科学院声学研究所； 中国科学院水声环境特性重点实验室； 中国科学院大学；

【摘要】 低频相控阵通过控置发射权系数,将声场能量集中在前3阶模态中,可在一定空间范围内实现多模声场聚焦。针对浅海波导的频散效应导致多模聚焦声场能量随频率起伏的问题,基于简正波理论分析了聚焦声场能量出现峰值时的频率位置。当聚焦距离改变时,可由先前的参数对新的聚焦位置的峰值频率进行估计,仿真结果表明,估计的峰值频率的最大误差为8 Hz,在可接受的误差范围之内。更多还原

【Abstract】 By controlling the weight coefficient vector,the low-frequency phased array can concentrate the energy of the sound field in the first three normal modes,and realize the multi-mode focusing effect within a certain spatial range.Aiming at the energy fluctuation of the multi-mode focused field caused by the dispersion effect of shallow water waveguide,the peak position of frequency is analyzed based on normal mode theory.When the focusing distance changes,the peak frequency of the new focusing position can be estimated by the previous parameters.The simulation results show that the maximum error of the estimated peak frequency is 8 Hz,which is within the acceptable error range.更多还原