1) directivity
[direk'tiviti]
指向性
1.
Measuring directivity of phased-array acoustic transmitter in acoustic log.;
声波测井相控线阵声波辐射器的指向性测量
2.
Numerical computation and experimental test of directivity pattern of low frequency flex-tensional transducer;
低频弯张换能器指向性数值计算及实验测试
3.
Analysis and experiment study on directivity of vector sensors located on complicated boundaries;
复杂边界条件下矢量传感器的指向性分析及实验研究
2) directional pattern
指向性
1.
The radiation pressure and directional formulation of the first vibration mode are calculated by use of Rayleigh-integration,the directional pattern in free boundary is plotted with the help of computer.
利用瑞利积分,求出板作一阶振动时辐射声压及指向性表达式,绘出自由边界条件下弯曲振动板轴对称弯曲振动辐射声压的远场指向性图,与薄圆板作一阶弯曲振动时的声场指向性图作了对比。
2.
The general pressure and directional formulation of different vibration mode are deduced, and the directional pattern is plotted using computer.
给出了频率方程的前 １５ 个根（σ＝ ０２８）和振动频率；推导出各阶振动模式的通用声压及其指向性表达式；绘出了薄圆板轴对称弯曲振动辐射声压的远场指向性图，为分析和设计复合弯曲超声换能器提供了理论依
3.
The radiation pressure and directional formulation of two rank vibration mode are deduced,with the help of compute,the directional pattern in simply supported boundary is plotted.
本文从薄圆板的振动特性出发,提出了一种相位变换弯振板,推导了这种弯振圆板作二阶振动的辐射声压及指向性表达式,绘出了简支边界条件下弯振板轴对称弯曲振动辐射声压的远场指向性图。
3) directivity index
指向性指数
1.
The main differences between radiation angle and coverage angle are given, and the loudspeak′s directivity index is measured by two methods.
笔者对这些变化进行了解读,强调"辐射角"和"覆盖角"的区别,并用2种方法测量了扬声器指向性指数,从而说明新版标准中给出的用覆盖角计算指向性指数的方法简便易用。
2.
The definition of directivity factor,directivity index & equation are introduced firstly.
介绍了指向性因数和指向性指数的定义、计算式。
4) Super directivity
超指向性
1.
The results show that this kind of microphone has characters of super directivity and constant beam width.
建立了传声器方向性函数的表达式,分析了影响方向性图的各个因素,结果表明它具有明显的超指向性和恒定束宽特性。
5) unidirectivity
['ju:nidirek'tiviti]
单指向性
6) high directivity
高指向性
1.
Audio directional loudspeaker is a novel loudspeaker which can generate an audio signal with high directivity by utilizing the parametric array principle.
声频定向扬声器是利用参量阵原理,产生高指向性声频信号的新一代扬声器。
补充资料：指向性
指向性
物理学术语。发射(或接收)某一频率声波的声源(或声接收器)在其远场中的发射声压(或接收灵敏度)的方向特性。常用指向性图表示。指向性是声源在远场形成波束的方向特性，也是声接收器对入射声波的方向选择特性。它与声源(或接收器)的工作表面形状、大小和声波波长有关。换能器阵列的指向性还与各换能器阵元的振幅、相位有关。在声波束形成和接收指向性形成中，进行最优化设计是声学工程的重要内容之一。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条