4) ultrasonic nondestructive testing
超声无损检测
1.
It is fast and whole testing that using the technology of ultrasonic nondestructive testing to estimate some performance of powder m.
针对粉末冶金(PM)零件在制备过程中不可避免存在的缺陷(气孔或裂纹),采用超声无损检测(NDT)技术对其进行了初步研究。
2.
To enhance the signal to noise ratio (SNR) of fundamental ultrasonic echo signals for ultrasonic nondestructive testing (UNDT) and ultrasonic nondestructive evaluation (UNDE), an improved technique to suppress structural noises of ultrasonic signals was presented.
为了提高超声无损检测(UNDT)与无损评价(UNDE)基础数据的信噪比(SNR),提出了一种基于神经网络模式识别理论的小波域超声信号消噪技术。
3.
A 5-axis automatic scanning system, the composition of hardware and software platform of it is present in ultrasonic nondestructive testing.
介绍了五轴超声无损检测自动扫描系统的工作原理 ,并详细介绍了其控制系统的硬件配置和软件组成 ,该系统能够控制机械装置带动探头实现对复杂曲面的自动扫
5) Ultrasonic nondestructive testing(UNDT)
超声无损检测
1.
To increase A-scan signals time resolution of thin multilayer composite materials in ultrasonic nondestructive testing(UNDT),a new approach of deconvolution technique based on wavelet multi-resolution analysis was proposed.
为了提高薄层复合材料超声无损检测(UNDT)中A扫描信号时域分辨率,提出一种基于小波变换多分辨率分析的反卷积技术新方法。
2.
A novel adaptive SSP technique based on the pattern recognition theory of support vector machine(SVM) was presented to enhance the signal to noise ratio(SNR) of fundamental ultrasonic echo signals for ultrasonic nondestructive testing(UNDT) a.
为了提高超声无损检测(UNDT)和无损评价(UNDE)中基础数据的信噪比(SNR),提出了一种基于支持向量机(SVM)模式识别理论的自适应裂谱分析方法。
3.
A new wide adaptability deconvolution technique based on wavelet transform and particle swarm optimization(PSO) was developed to increase the resolution of ultrasonic nondestructive testing(UNDT) of composite materials.
为了提高复合材料超声无损检测(UNDT)分辨率,提出一种基于小波变换和粒子群算法(PSO)的广谱反卷积新技术。
6) UNDT
超声无损检测
1.
In order to enhance the signal to noise ratio(SNR) of fundamental ultrasonic echo signal for ultrasonic nondestructive testing(UNDT) and ultrasonic nondestructive evaluation(UNDE),a new denoising technique for ultrasonic signal based on lifting wavelet transform multi-resolution analysis was presented.
为了提高超声无损检测(UNDT)和无损评价(UNDE)中基础数据的信噪比(SNR),提出了一种基于提升小波变换多分辨率分析的超声信号消噪新技术。
2.
of conventional deconvolution techniques were analyzed to increase A-scan signals\' time resolution of composite materials in ultrasonic nondestructive testing(UNDT).
为了提高复合材料超声无损检测中A扫描信号的时域分辨率,在分析传统反卷积技术需要先验知识等局限性的基础上,提出了一种基于提升小波变换和遗传算法的反卷积技术。
3.
In order to enhance the Signal to Noise Ratio(SNR) of fundamental ultrasonic echo signals for Ultrasonic Non-Destructive Testing(UNDT) and Ultrasonic Nondestructive Evaluation(UNDE),wavelet transform multi-resolution ability was used to denoise ultrasonic signals.
为了提高超声无损检测和无损评价中基础数据的信噪比,利用小波变换多分辨率性能实现对超声信号的消噪。
补充资料：无损检测
| 无损检测 nondestructive test 在不损伤被测材料的情况下，检查材料的内在或表面缺陷，或测定材料的某些物理量、性能、组织状态等的检测技术。广泛用于金属材料、非金属材料、复合材料及其制品以及一些电子元器件的检测。常用的无损检测技术有：①射线探伤。利用X射线或γ射线在穿透被检物各部分时强度衰减的不同，检测被检物的缺陷。若将受到不同程度吸收的射线投射到X射线胶片上 ，经显影后可得到显示物体厚度变化和内部缺陷情况的照片。如用荧光屏代替胶片，可直接观察被检物体的内部情况。②超声检测。利用物体自身或缺陷的声学特性对超声波传播的影响，来检测物体的缺陷或某些物理特性。在超声检测中常用的超声频率为0.5～5兆赫（MHz）。最常用的超声检测是脉冲探伤。③声发射检测。通过接收和分析材料的声发射信号来评定材料的性能或结构完整性。材料中因裂缝扩展、塑性变形或相变等引起应变能快速释放而产生应力波的现象称为声发射。材料在外部因素作用下产生的声发射，被声传感器接收转换成电信号，经放大后送至信号处理器，从而测量出声发射信号的各种特征参数。④渗透探伤。利用某些液体对狭窄缝隙的渗透性来探测表面缺陷。常用的渗透液为含有有色染料或荧光的液体。⑤磁粉探伤。通过磁粉在物体缺陷附近漏磁场中的堆积来检测物体表面或近表面处的缺陷，被检测物体必须具有铁磁性。此外，中子射线照相法、激光全息照相法、超声全息照相法、红外检测、微波检测等无损检测新技术也得到了发展和应用。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条