环鸣测量声速法具有电路简单、使用方便、测量精度高等优点，已广泛地应用。
Sing-around method for sound velocity measurement have found wide acceptance because it is simple in circuitry and high in accuracy.
通过声速法和X射线衍射实验测试纤维的取向和结晶，结合纤维结构及纤维应用讨论了两种PET纤维的模量-应变曲线特点。
The orientation and crystallinity of the PET fibers were measured by sonic and X-ray diffraction. The feature of modulus-strain curves were discussed from the fiber structure and applications.
本文采用改进的流线曲率法对跨声速多级轴流压气机非设计点进行了性能模拟。
An improved streamline curvature numerical method is modified and applied to better approximate the flow fields of multi-stage transonic axial compressors.
本文介绍利用超声共振法测量声速和声衰减系数的原理及自来水和乙醇的测量结果。
In this paper, the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.
亚声速气动力采用面源法计算，高超声速气动力采用修正的牛顿流理论计算。
Panel Method was used for subsonic aerodynamic analysis, and the Modified Newtonian Impact Theory was used for hypersonic aerodynamic analysis.
用李萨如图形法测量声速误差较小。
The experiment error of sound velocity measuring is very small with lissajous figures.
本文首次将底部排气法应用于导弹上，结合一种具有常规气动布局的超声速导弹进行了底部排气方案设计，采用一种“底窝器”来提高进气道整流罩的底部压强，并进行了风洞实验验证。
Then, the base bleed method is introduced on a general supersonic missile to decrease the base drag of the inlet cowl for the first time and is validated by wind tunnel test.
基于特征线法，并考虑变比热的影响，开展了高超声速飞行器用单膨胀斜面喷管设计。
For hypersonic vehicles, the effect of nozzle aerodynamic characteristics on vehicles performance is serious.
本文采用改进的流线曲率法+对跨声速多级轴流压气机非设计点进行了性能模拟。
An improved streamline curvature numerical method is modified and applied to better approximate the flow fields of multi-stage transonic axial compressors.
声速检测采用比较法，相对误差小于0.5%。
采用后向面判别法和深度缓冲器算法分析面元之间的遮挡关系，计算了整个高超声速飞行器的RCS。
To compute RCS of whole HCV, the shadowing relationship of facet analyzed by the method of backward surface identification and depth-buffer is considered.
通过实验，应用相位比较法和驻波法对空气中的声速测量进行了研究。
The measurement of sound speed in the air is studied in the experiment by phase comparison method and standing wave method.
为了方便教学，对用共振干涉法和相位比较法测定超声声速的原理进行了剖析、比。
The principles used in measuring sound velocity by means of resonant interference and phase comparison are analyzed and compared, which are convenient for teaching.
声速变化比质量损失变化明显，说明超声波法是一种检测混凝土冻融损伤的简单可靠的方法。
The variation of sound velocity was more obvious than quality loss. It was concluded that ultrasonic techno…
超声脉冲回波法是一种高精度的弹性模量声速测量法。
The ultrasonic pulse reflecting method is applied to survey the dynamic elastic moduli.
本文第一章介绍我们的超声波声速仪的原理和误差分析，并给出它和回呜法的比较。
In the first part of this paper, the principle and the error analysis of our ultrasonic velocimeter are presented, and a comparison with the "Sing Around velocimeter" is given.
因而该方法具备了相差法检测灵敏度高和频差法受被测流体声速变化影响小的特点。
So this technique has high sensitivity which phase difference method has and is hardly affected by the variation of the sound speed of the fluid, just as frequency difference method is .
因而该方法具备了相差法检测灵敏度高和频差法受被测流体声速变化影响小的特点。
So this technique has high sensitivity which phase difference method has and is hardly affected by the variation of the sound speed of the fluid, just as frequency difference method is .
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