声阻抗

声阻抗理论与噪声屏蔽设计的探讨

Theory of Acoustic Impedance and its Application on Barrier Design

经验表明，只有当流体驱替所引起的声阻抗变化大于4%时，才有望在地震资料中观测到地震差异。

Practice have showed that 4 D seismic can be successfully performed only when the change of acoustic impedance caused by fluid substitution is more than 4 % .

Q值测量的等效声阻抗法

Equivalent Acoustic Impedance Technique for Measuring Q Value

本文从Helmholtz波动方程出发，导出了考虑结构表面有声阻抗材料时的边界元方程形式。

The boundary element formulation considering impedance surfaces is deduced from Helmholtz wave equation .

弹性波阻抗反演是一种结合了常规声阻抗反演和叠前AVO反演的地震反演技术。

Elastic wave impedance inversion is a seismic inversion technique combining ordinary sonic impedance inversion with AVO inversion .

方法对116例腭裂患儿与73例正常儿童，进行声阻抗、纯音测听、听性脑反应测试，分析SOM的发生率及听力下降情况。

Methods 116 children with cleftpalate and 73 normal children were investigated by tympanogram , hearing threshold and auditory brain response .

为了解分泌性中耳炎（OME）对内耳听觉功能的影响，对OME220例、304耳分别进行纯音测听及声阻抗测定。

Three hundred and four ears from 220 patients with secretory otitis media ( OME ) were performed pure tone audiometry and acoustic impedance audiometry respectively .

结果表明这种复合材料的谐振模式单一，与PZT相比声阻抗大幅降低，前者为31Mrayl，后者仅为4.5~5.5Mrayl。

The results show that the resonant mode of the composites is single mode , and the acoustic impedance ( 4.5 & 5.5 Mrayl ) of the composites is obviously less than that ( 31 Mrayl ) of the PZT ceramic .

为达到实时、在线和精确地重建声阻抗的目的，根据信息技术、计算机技术和微电子技术的最新研究成果，采用DSP和ARM芯片作为中心测控单元，实现了一种嵌入式便携声阻抗重建系统。

In order to reach the aim of reconstructing ultrasonic impedance in real-time , on-line and accurately , and according to the latest achievement in information , computer and micro-electronic technologies , an embedded and portable system adopting DSP and ARM chips as central measuring and controlling unit is presented .

传感器的灵敏度则随着背衬声阻抗的增加而减小。

The sensitivity of sensor decreases with the increasing acoustic impedance .

切向流与偏流相互干扰对穿孔板声阻抗的影响

Effect of Grazing-Bias Flow Interaction on Acoustic Impedance of Perforated Plates

基于一维波动方程重建层状介质声阻抗图的算法

Acoustic Impedance Reconstruction Algorithm for Layered Medium Based on 1-D Wave Equation

离散形式的声阻抗反演问题的稳定性分析

Stability analysis for the problem of 1-D impedance inversion from difference equations

声阻抗梯度渐进的高分子微粒吸声材料

Gradual change of impedance for polymer micro-particles sound absorption material

管路柔性元件声阻抗测试方法研究

Study on the measurement technique on acoustic impedance of pipe flexible components

一维声波方程声阻抗反演问题的稳定性分析

The stability analysis for the inverse problem of one dimensional acoustics wave equations

叠层装甲材料的声阻抗匹配与抗弹性能的关系研究

Effect of Acoustic impedance matching of laminate armor material on its ballistic capability

压电生物传感器响应机制的声阻抗模型理论分析

Theoretical Analysis of Response Mechanisms of Piezoelectric Biosensors Based on Acoustic Impedance Model

可压缩偏流条件下穿孔板声阻抗率的分析

Analysis of the Acoustic Impedance of Perforated Panels with a Compressible Bias Flow

讨论了一维声波方程的声阻抗反演问题。

The inverse problem for the one dimensional acoustic wave equations is discussed .

双换能器法测定管内声阻抗

Measuring acoustical impedance of material by two transducers method in standing wave tube

驻波管法吸声系数与声阻抗率测量规范

Code for measurement of sound-absorbing coefficient and specific acoustic impedance of standing-wave meter

在这基础上，导出了严格的非线性耦合声阻抗率理论计算公式。

The rigorous formula to calculate the nonlinear coupling specific acoustic impedance is derived .

本文提出一种为计算法向声阻抗率而设计的专用列线图。

A special nomograph designed for calculating the normal specific acoustic impedance is proposed .

噪声性耳聋声阻抗测定

Measurement of acoustic impedance for the noise-induced deafness

由于波响应反演声阻抗的特征带方法

The characteristic band method for acoustic impedance inversion

声阻抗是密度与声速的乘积。

And acoustic impedance is the product of density and the velocity of sound .

计算声阻抗率专用列线图

A Special Nomograph for Calculating Specific Acoustic Impedance

超声干涉法薄层厚度测量声阻抗匹配判据及其应用干涉型声光纤声传感器

Acoustic Impedance Matching Criteria and Their Applications for Layer Thickness Measurement by Ultrasonic Interferometry

美尼尔氏病的声阻抗测试

Acoustic Impedance Tests in Meniere 's Disease