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超声无损检测信号
ultrasonic nondestructive test signal
Ultrasonic nondestructive test signal processing based on empirical mode decomposition 应用经验模式分解法处理超声无损检测信号 短句来源 “超声无损检测信号”译为未确定词的双语例句
This paper investigates the analysis of ultrasonic Lamb wave in non-destructive testing (NDT) field and the application of time-frequency method in on-line damage monitoring of smart composite structures. 本文采用时频分析方法进行 Lamb 波超声无损检测信号的处理,对其在智能复合材料结构损伤在线检测中的应用进行了研究。 短句来源 The Hilbert-Huang transform was used to improve estimates of the position and relative size of defects for nonlinear ultrasonic nondestructive testing. 为了提高非线性超声无损检测方法对缺陷位置和相对大小的表征能力,该文将H ilbert-Huang变换方法用于非线性超声无损检测信号的处理。 短句来源 The detected signal in stainless steel is nonlinear,non-stationary and has a low signal-to-noise ratio. 粗晶奥氏体不锈钢材料的非线性超声无损检测信号具有非线性、非稳态和低信噪比的特性,H ilbert-Huang变换对此类信号的特征提取具有独特的优势。 短句来源 Ultrasonic NDT signals are sometimes difficult to determine the sizes of cracks because of low SNR or overlapping echoes. 由于超声回波信号受到噪声干扰或者到达时间混叠,故超声无损检测信号很难鉴别缺陷的大小. 短句来源 相似匹配句对
Laser Uitrasonic Techniques for Non-destructive Testing 激光超声无损检测 短句来源 Application of two-dimensional signal analysis in ultrasonic nondestructive testing 二维信号分析法在超声无损检测中的应用 短句来源 A New Identification Method of Ultrasonic NDT Echo Signals 一种新的超声无损检测回波信号的识别方法 短句来源 Ultrasonic Nondestructive Testing of Braze Defects 钎焊缺陷的超声无损检测 短句来源 ULTRASONIC NONDESTRUCTIVE TESTING BASED ON DIGITAL SIGNAL PROCESSOR 基于数字信号处理器的超声无损检测 短句来源 
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Ultrasonic NDT of interface debond in a multi-layer steel-rubber structure is studied. Based on a simple deconvolution model of multi-layer, the analytic expression of the received echo signal is derived. The characteristics of the second interface debond is extracted by the Homomorphic deconvolution algorithm we developed. Results of both simulation and experiment well indicate the excellence of the method. 本文利用建立的多层粘接结构超声无损检测信号的卷积模型，推导出了检测信号的解析表达式，并用同态滤波解卷积方法有效地提取出粘接结构的系统响应，进而由其中界面多次反射响应的位置、幅度和包络等特征参数，实现了脱粘二界面（指空气脱粘）的定征和识别．仿真和实验数据的处理结果表明本文方法对脱粘检测的应用有积极的意义。 文摘来源 The application of continuous wavelet transform to ultrasonic nondestructive inspection signal processing is discussed in this paper.The continuous wavelet transform has its advantages over the discrete wavelet transform,it can detect the detail of the signal in time-scale domain.Continuous wavelet transform is used on the basis of three types of pressure vessel welding flaws.Using a grid which is similar to time-scale phase plane,the flaw signal area average feature value is extracted from wavelet tran... 本文研究连续小波变换方法在焊接结构超声无损检测信号处理中的应用 .以压力容器的三种焊接缺陷为对象 ,对缺陷回波信号作连续小波变换 ,对小波变换尺度图采用与时间—尺度相平面相似的网格作区域平均特征提取 ,并对提取出的特征利用B -P型神经网络进行训练和分类 .实验结果表明 :连续小波变换在信号特征提取上具有优良特性 文摘来源 The Hilbert-Huang transform was used to improve estimates of the position and relative size of defects for nonlinear ultrasonic nondestructive testing.The detected signal in stainless steel is nonlinear,non-stationary and has a low signal-to-noise ratio.The instantaneous frequency can indicate the defect position,which the instantaneous amplitude can characterize the relative defect size.The method can detect a 0.8 mm flat-bottom hole(at a depth of 65 mm) in a stainless steel sample of average grain size(... 为了提高非线性超声无损检测方法对缺陷位置和相对大小的表征能力,该文将H ilbert-Huang变换方法用于非线性超声无损检测信号的处理。粗晶奥氏体不锈钢材料的非线性超声无损检测信号具有非线性、非稳态和低信噪比的特性,H ilbert-Huang变换对此类信号的特征提取具有独特的优势。实验结果表明:通过H ilbert-Huang变换的瞬时频率能够确定缺陷位置,瞬时幅度可表征缺陷的相对大小;该方法达到了对0.6mm晶粒平均直径的粗晶奥氏体不锈钢中65 mm深、0.8 mm平底孔的小缺陷检出能力,说明H ilbert-Huang变换有效提高了非线性超声无损检测的缺陷表征能力。 文摘来源 << 更多相关文摘 
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