查询词典 acoustic

Fast algorithm ; Helmholtz exterior problem ; virtual boundary integral method ; inverse fast Fourier transformation; acoustic radiation ; harmonic excitation

快速算法； Helmholtz外问题；虚拟边界积分法；快速Fourier逆这换；声辐射；谐激励

The problems of acoustic radiation and scattering in infinite exterior domain are studied by employing fractal two-level finite element method.

应用二级分形有限元方法研究了无限大外域声辐射和散射问题。

The calculation formulas of the boundary element method for the exterior acoustic radiation problem in the full-space and half-space are deduced, based on the wave propagat...

第一章评价了振动声辐射计算在结构低噪声设计中的作用；回顾并分析了振动声辐射计算发展的历史和研究现状；介绍了本。。。

By reason of the dipole directivity of particle velocity sensor and also the acoustic intensity averagor, and its being able to realize the electronic rotation, coherent interferences can be effectively suppressed by skillful use of its zero point and extremal point.

振速传感器和平均声强器具有偶极子指向性，并且该指向性可实现电子旋转。巧妙利用偶极子指向性的零点和极值点，可有效地抑制声场中的相干干扰。

Investigation of the ballistic propagation of acoustic wave through two almost same sintered samples with face - centered cubic lattices indicates that there is a band gap range respectively in two order quasi - homogeneous media.

研究超声波经过两个烧结样品的行为。两个烧结样品为有序的面心立方结构，它们的结构几乎相同。研究表明：在两个有序的准均匀的介质中分别有一个禁带区域。

Note that the limiting factor here turns out to be the acoustic environment.

记下限制它们的因素，以弄清声学环境。

The fade-in and fade-out acoustic signals compacted and expanded on the time axis are cross fade processed.

对时间轴压缩扩展过的淡入侧的信号序列、和淡出侧的信号序列进行交叉渐变处理。

The fundamental tones of the two series of signals perform the compensation of the phase difference between the fade-in and fade-out acoustic signals.

根据基音分量来校正淡入侧的信号序列和淡出侧的信号序列之间的相位差。

A numerical example of rocket fairing structural-acoustic model and its simulation results are given.

最后给出一个火箭整流罩模型的例子和它的仿真结果。

The design of a surface acoustic wave filter with a center frequency of 44?MHz, a 1?dB bandwidth of 8?MHz, an out-of-band rejection of more than 60?

采用数字傅里叶变换技术设计并制作了一个中心频率为44MHz，1dB带宽为8MHz，带外抑制大于60dB，插损小于28dB的带通滤波器。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。