山东建筑大学学报2017，Vol.32Issue(2)：118-124,7.
埃及裂颜蝠超声辐射波束形成结构的数值研究
Numerical study of structure of emission beamforming in Egyptian slit-faced bat
摘要
Abstract
Smart antenna is the indispensable key technology of the third generation mobile communication system,and theoretical basis obtained by this work can improve the characterise of smart antenna.The purpose of this study is to explore the effect of different parts(pit,upper leaf and lower leaf)of noseleaf on ultrasonic emission beamforming using finite difference time domain method (FDTD)and Kirchhoff integral.Three dimensional numerical model of noesleaf was built by scanning sample and processing scanned images,and all various models of noesleaf were got by removing different sections separately or together.Then,all models were studied by numerical method. Acoustic near-field pressure magnitude,far-field radiation pattern and directivity correlation coefficient were represented as results.Simulation results show that the pit has a significant impact on increasing magnitudes near the area of pit,and it also can focus the acoustic near field as well as shaping the radiation patterns and hence enhancing the directionality.In terms of the function of upper leaf,it can adjust the amplitudes of the acoustic beam near the pit and front.The lower leaf seems to overall focus the acoustical near field.What's more,interactions between the acousticeffects of the parts were also evident,and different combinations of three parts generate complicated influence on beam-forming. Theaveragedirectivity correlation coefficient of a model which was removed all three parts is lower than 0.85,this phenomenon indicates that this kind of model has the most obvious effect on the distribution of sound field.关键词
埃及裂颜蝠/鼻叶模型/超声辐射波束/辐射波瓣图Key words
Egyptian slit-faced bat/noseleaf model/emission beamforming/radiation pattern分类
生物科学引用本文复制引用
庄桥,陈晓乾,张美生..埃及裂颜蝠超声辐射波束形成结构的数值研究[J].山东建筑大学学报,2017,32(2):118-124,7.基金项目
国家自然科学基金项目(11374193) （11374193）
山东建筑大学博士科研基金项目(XNBS1276,XNBS1269) （XNBS1276,XNBS1269）
