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- The wavelet analysis is applied to AE signal processing and it will be helpful to the development,popularization and application of AE technique. 将小波分析用于声发射信号处理 ,有助于声发射技术的发展与推广应用。
- The AE signal will be stronger when H >0.5, and it is weaker when H <0.5. On the basis of this character of Hurst index, the Kaiser point can be determined correctly by calculating the Hurst index of AE signal curve. H <0 .;5时;声发射信号趋于减弱。 根据这一规律;通过计算声发射信号曲线的赫斯特指数 (或分形维数 );便可确定声发射试验中的凯塞点。
- According to the intensity and change of AE signal,the service situation of the operated pressure vessels can be evaluated,and therewith the service fifetime of which can be quantitative estimated. 根据声发射信号强度及其变化可以准确判断设备的运行状况;定量确定压力容器的服役年限.
- This article describe s the use of the artificial neural netw ork technology to study the service qual i ty of AE signal’s recognition and AE sou rce pattern’s classification for the sphe re vessel. 利用人工神经网络技术 ,对球形容器声发射检测信号进行有效性识别及源模式分类研究。通过对所得典型实验数据进行有效性分析。
- Tests show that AE signals may be detected from background noises in cutting process, a few hundreds millisecond before tool break down abrupt. 试验结果证明,刀具破损前会出现预兆性的AE信号,并可把该信号从背景噪声中检测出来。
- DISP-TRA software program allows the user to perform transient waveform collection and analysis of AE signals as collected from the DISP. DISP TRA提供了由软件控制的波形回放、数据处理和同步触发的功能。
- An intelligent pattern classifier with B-P neural network is used in recognition of those five kinds of AE signals successfully. 采用B-P型反向传播神经网络构成的智能化模式分类器,对此五类声发射信号进行识别,获得了满意的效果。
- The AE signals from rolling bearing were processed by high-pass filter and demodulation and compared with vibration signals. 把声发射信号与振动信号作对比,通过高通滤波后再进行包络解调,结果表明声发射信号可以较早地诊断出故障,抗干扰性好。
- AE signal parameter analysis method of press vessel 压力容器声发射信号参数分析方法的探讨
- Then, the ICA is introduced to preprocess AE signals, and the fractal dimension is calculated from the independent signal after ICA process, with the AE source lead simulation being finally performed. 接着引入ICA进行信号预处理,以提取源独立的去噪信号进行分形维计算。最后进行了多组铅心模拟声发射实验。
- The AE signals of tool conditions were decomposed using a recursive wavelet from which the features are extracted and delivered to an ART2 network for fault recognition. 对刀具AE信号进行递归小波分解,提取特征并应用ART2网络识别刀具状态。
- Moreover,the relation between AE signals and the failure processes of FWC from matrix cracks,delaminations,fiber breaks to burst with the water pressure increasing is analyzed. 分析了随着水压增加从基体开裂、层间分层及纤维断裂到最终破坏与声发射信号的关系;
- The AE signals of tool conditions were decomposed using a recursive wavelet from which the features were extracted and delivered to the wavelet network for fault recognition, and the recognition rate is up to 100%. 最后,对刀具AE信号进行递归小波分解,提取特征并应用小波网络识别刀具状态,识别率达到100%25。
- The relation between AE signals and the failure process, in which FWC is from the matrix cracks, delaminations and fiber breaks to the bursts with the increase of water pressure, is analyzed. 分析了纤维缠绕壳体随著水压的增加从基体开裂、层间分层及纤维断裂到最终破坏的过程与声发射信号的关系;
- Through the effectiveness anal ysis of typical experimental data,the au thors find a new method to use the modif ied BP ANN to accurately recognize the e ffective AE signals from experimental da ta. 最终确定用改进的多层前向误差反传网络 (BP)对声发射信号进行定量化有效性识别的新方法 ,该方法能够很好地区分出声发射实验数据中的有效信号。
- A red light is usually a signal of danger. 红灯通常是危险的信号。
- AE signals released from different lay-ups composite specimens were acquired by a wideband transducer, and fracture surfaces of the specimens were observed by scanning electron microscope (SEM). 宽带传感器记录了不同角度纤维铺层的复合材料试样在拉伸破坏过程中的声发射信号,用扫描电子显微镜(SEM)观察了试样的几种典型的损伤破坏断面,对比分析了不同类型的损伤机制。
- I stood watching for the signal to change to green. 我站着等待交通信号转为绿灯。
- Let's set the clock by the radio time signal. 咱们照着收音机的报时信号把钟对一对。
- A red lamp is often a danger signal. 红灯常常是危险的信号。