摘要
为分析球形阵列结构参数对三维波束形成声源识别性能的影响,基于延迟求和波束形成理论,仿真分析了主瓣宽度和最大旁瓣水平随阵列直径的变化规律,结果表明：在传声器布置形式一致的情况下,直径越大,阵列空间分辨率越好,但对旁瓣抑制能力越弱;模拟计算了5种典型球形阵列的阵列模式径向投影及最大旁瓣水平,结果显示：传声器均匀分布球形阵列的性能最好,在50～100rad/m的波数范围内,最大旁瓣水平约为-12dB,在波数高达220rad/m时最大旁瓣水平也低于-6dB。提高球形阵列传声器分布的均匀程度和密集程度能显著提高阵列性能。
Aiming at the problem of inconsistency of index system in initial water rights allocation modeling, the concept of friendly allocation of initial water rights was put forward. Based on the principles of food security, ecological water guarantee, preference of status in quo, fairness, high efficiency and environmental protection, the friendly sub-functions were established and the friendly allocation model of initial water fights was proposed with maximizing friendly function of initial water fights allocation. As a case study, the proposed allocation model was applied in Fuhuan River Basin in Hubei Province, and the results indicate that the model can avoid the difficulty of inconsistency of index system and quantitatively express the allocation of initial water rights and provides a new method for initial water fights allocation in the river basin.
出处
《农业工程学报》
CSCD
北大核心
2012年第12期80-85,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
牵引动力国家重点实验室开发课题（TPL0903）
国家自然科学基金项目（50975296）
关键词
传声器阵列
波束形成
声学成像
性能分析
water resources, algorithms, models, initial water rights allocation, friendly function, chaos optimizationalgorithm
