| 1. | So they ' re vibrating sub sonically
所以它们在用次声振动 |
| 2. | Research on the feature extraction based on the acoustic property of target is the main method to the target classification
利用目标声振动信号进行特征提取是目标识别的有效手段。 |
| 3. | Ceramic material had better performance than steel and copper and the shorter the stack , the lower the initial temperature for oscillation
而从热声振动的方式来看，强制振动比自激振动具有更低的起振温度。 |
| 4. | Based on these types of acoustic / vibration sensor , a novel coupling acoustic / vibration optic fiber sensor has been developed
本课题在这些类型的声振动传感器的基础上，研制出了独具特色的耦合型声振动光纤传感器。 |
| 5. | Because there are defaults in the classic methods of acoustic signal analysis , a new method based on the wavelet analysis is brought forward in the paper
针对传统的声信号分析方法在信号特征提取方面存在的缺陷，本文提出了一种基于小波变换的声振动信号的特征提取方法。 |
| 6. | The wave length of infra - sound is quite long : typical infra - sound from the eye of a typhoon has a 4 to 8 second cycle 0 . 25 to 0 . 125 hz , meaning that its wavelength is a few kilo - metres long
次声波的波长很长，例如台台风眼所产生的次声振动周期约秒0 . 250 . 125赫兹，波长便可达数公里。 |
| 7. | Powerful , dynamic sound with its lively spectrum of tonal nuances . top - grade sand cast iron is used for the cast iron plate , as it is the type of cast iron which is least prone to vibrating , thereby causing unwelcome interference
我们专门选用灰口铸铁来生产这种铸铁板，因为这种材料在所有铸件铸铁材料中最不易随声波产声振动，从而可以有效避免因这种振动所产生的会对钢琴声音有不良干扰。 |
| 8. | Measurement of acoustic / vibration signal is a very important part in a sensing system , acoustic / vibration sensors have experienced many kinds such as the piezoelectricity , the optic fiber interferometers ( ofi ) , optic fiber f - p interferometers , optic fiber grating
声振动信号检测是传感系统中一个非常重要的部分，声振动传感器经历了压电陶瓷型，光纤干涉型，光纤f - p腔型，光纤光栅型等多种类型的传感器。 |
| 9. | In the course of theory analyses , acoustic / vibration signal acts on the coupling area of a coupler . there are two different actions - horizontal operation and vertical operation and two different transmissions - traveling wave and standing wave . the responses of the sensor analyzed with matlab shows that the length of coupling and the frequency of acoustic / vibration signal will influence the sensitivity of the sensor
理论分析过程中，声振动信号对传感器的耦合区有不同作用方式(横向作用纵向作用)以及不同传播形式(驻波传播/行波传播) ，用数学软件matlab对其响应进行仿真分析，得出了耦合长度和声振动信号频率会影响传感器的灵敏度。 |
| 10. | In experimental , static response and frequency response of coupling acoustic / vibration optic fiber sensor have been analyzed . the results indicate that the response of the sensor to static pressure has high sensitivity . because the resonant frequency of different materials and structure is different , the sensor has maximum sensitivity in specific frequency
试验研究中，对耦合型声振动光纤传感器的静态响应特性和频率响应特性进行了试验分析，分析结果表明该类型传感器对应变的响应非常灵敏，而对频率的响应则由于材料及结构本身的共振频率的差异有不同的峰值响应频率。 |
