本研究设计了一种超声频脉冲等离子切割电弧发生系统，并通过实际切割试验，测试、分析了这种高频脉冲电弧的振动特性。
This study designed a system to generate ultrasonic-frequency pulsed plasma cutting arc, and experimentally investigated the vibration characteristics of the high frequency pulsed arc.
水流的初生空化噪声频率不仅与汽化压力和流体的特性有关，而且还与流体的环境压力分布和速度分布有关，与空化类型关系更为密切。
The inception cavitation does n'f only related the liquid vapouration pressure and its character, but also the pressure grad and velocity distribution.
利用超声频谱分析法对换能器进行频率特性分析，找出适合检测的最佳状态。
Spectrum feature analysis of the transducer apparatus is also conducted with this approach and thus achieves the best testing status.
针对某型柴油机排气噪声频谱特性，设计了一种新型阻抗复合式排气消声器。
The design process of a new type of exhaust silencer for some diesel engine models was discussed.
为利用观察点处实测声频谱来预估实际声源自由场频谱特性，必须适当地计及地面反射和衰减效应的影响。
The ground reflection and attenuation must be properly accounted for in order to use the source spectrum measured at the site of the observer to predict the actual source spectrum in the free field.
结合岩心砂泥岩频散特性实验结果分析了岩心在饱水及干燥状态下声频散的特点。
Based on the results of dispersion experiments on cores of sand and shale, the paper analyzed the variability of acoustic dispersion for dry and water-saturated cores.
试验和分析木工平刨床空转和切削时的噪声源、噪声频率特性和各种降噪方法。
Testing and analyzing the noise source of idle run and cutting, noise frequency characters and all kinds of methods for noise reduction for the surface planer were carried out.
分析了全封闭活塞式冰箱压缩机噪声来源、传播途径以及所研究的冰箱压缩机的噪声频率特性。
The noise resources, noise propagating ways and its spectrum characteristic of a hermetic reciprocating refrigerator compressor were analyzed.
在密闭型耳罩中，利用有源降噪技术可以较好地衰减低频噪声以使整个可听声频率范围内获得良好的衰减特性。
L. f. noise can be better attenuated so as to obtain good attenuation characteristics over the entire audible frequency range by using active noise reduction technique in the closed-air type earmuff.
通过对现有交通流量检测方法和汽车噪声信号特性的分析，提出一种基于麦克风阵列的交通量声频检测方法。
In this paper, a new method of traffic volume detection with microphone array is presented. And the condition of current traffic volume detection methods and vehicle noise signal is also analyzed.
通过对现有交通流量检测方法和汽车噪声信号特性的分析，提出一种基于麦克风阵列的交通量声频检测方法。
In this paper, a new method of traffic volume detection with microphone array is presented. And the condition of current traffic volume detection methods and vehicle noise signal is also analyzed.
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