| 彭海军,申彦君,齐红德,金石娇.非均匀钹式换能器平面阵指向性特性研究[J].,2014,33(5):405-411 |
| 非均匀钹式换能器平面阵指向性特性研究 |
| Directivity of nonuniform cymbal planar array |
| 投稿时间：2013-11-14 修订日期：2014-08-20 |
| 中文摘要: |
| 针对钹式基阵工作频率低、布阵紧凑导致阵元之间互干扰严重、指向性能退化的现象，本文在均匀平面基阵的基础上提出强度可调节的非均匀平面基阵，建立了基阵指向性能的数学模型，通过数值计算的方法分析阵元间距和中心阵元声强度变化对基阵指向性能的影响。研究给出了主瓣宽度、旁瓣个数、栅瓣个数随阵元间距的变化规律，总结了在各种工作频率下，基阵可用的最大阵元间距。研究结果还表明：中心阵元强度增大时，基阵的总体指向性稍有降低，所以当通过调整阵元间距和强度来优化基阵指向性能时，应综合考虑它们对基阵其它性能的影响，以获得最佳的总体性能。 |
| 英文摘要: |
| The work frequency of cymbal array is very low, but the space between elements is limited, so interference of elements affects the directivity of array severely. Based on uniform planar array, this article brings up a new type of nonuniform planar array. The mathematic model of array directivity was build up and studied. Results showed that the spacing between elements and source strength of center element are important factors of array directivity. Laws of spacing affecting main lobe, side lobe and grating lobe were summed up. Max spacing of various frequencies was calculated out. The growing of center element strength showed negative effect on the array directivity. When used to enhance array directivity, elements’ spacing and strength should be considered together with other performances. |
| DOI：10.11684/j.issn.1000-310X.2014.05.005 |
| 中文关键词: 钹式阵列，非均匀平面阵，基阵指向性，数值计算 |
| 英文关键词: Cymbal array, Nonuniform planar array,Array directivity,Numerical computation |
| 基金项目:航空科学基金 |
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