共查询到20条相似文献,搜索用时 15 毫秒
1.
靳张铝 《仪表技术与传感器》1997,(5):26-28
智能型X射线探伤仪是以8098单片机为核心组成控制、监测电路的一种智能化探伤仪器。本文主要介绍它的系统功能、工作原理、硬件设计和软件设计。 相似文献
2.
Pashagin A. I. Shcherbinin V. E. Rydzevskii S. I. 《Russian Journal of Nondestructive Testing》2000,36(12):863-865
The design of a magnetic flaw detector with a magnetic bag used as a flaw indicator is discussed. Technical parameters of the detector and those of detected flaws are given. 相似文献
3.
Markov A. A. Shpagin D. A. Shilov M. N. 《Russian Journal of Nondestructive Testing》2003,39(2):105-114
Although automated testing instruments have been introduced intensely on the railways of Russia, up to 95% of hazardous flaws in rails are detected by ultrasonic two-line (removable) flaw detectors. The paper describes the functional diagram and basic functions of an ultrasonic detector of the new generation, AVIKON-01, with continuous recording of data. The instrument is supplied with the software package for analysis of testing results, and it has advantages of both hand-held removable flaw detectors and high-performance instruments for nondestructive testing of rails. 相似文献
4.
Wavelet Filtering of Signals from Ultrasonic Flaw Detector 总被引:1,自引:0,他引:1
Perov D. V. Rinkevich A. B. Smorodinskii Ya. G. 《Russian Journal of Nondestructive Testing》2002,38(12):869-882
The paper considers basic principles of the algorithm of wavelet filtering of signals from an ultrasonic aw detector with the help of the fast wavelet transform. Criteria for selection of the type and order of a wavelet are formulated, and the number of decomposition levels required for the needed accuracy and reproducibility of results of ultrasonic tests are determined. 相似文献
5.
6.
冲压零件尺寸合理标注的研究 总被引:1,自引:0,他引:1
通过对某冲压件厂生产中出现的冲压件废次品抽检结果进行分析,指出冲压零件尺寸标注不当是影响产品质量的一个重要原因,并提出了冲压零件尺寸合理标注的注意事项. 相似文献
7.
在自动超声探伤领域中,传统的多通道超声波探伤仪的抗干扰性能不甚理想的主要原因是其相关报警电路的抑制干扰性能较差。本文介绍了设计新颖的干扰抑制电路——符合式缺陷脉冲鉴别电路的构成与工作原理,并进一步叙述了采用该电路的CTS-46型六通道超声波探伤仪的抗干扰性能实验及现场测试实验。结论表明符合式缺陷脉冲鉴别电路的抗干扰性能很强,对自动探伤用多通道超声探伤仪而言,是一个很好的相关报警电路。 相似文献
8.
为提高超声波探伤仪在使用中的可靠性和准确性,设计了探伤仪发射端性能参数测量系统,实现探伤仪发射端输出特性各项参数的测量和校准.系统以工控机(IPC)为核心,采用PCI-5124采集卡进行探伤仪发射端输出信号的采集.基于VC++平台,设计了测量系统人机交互界面,实现了数据采集控制及各项测量参数的信号处理算法.测试结果表明:系统可对超声探伤仪发射端输出的脉冲峰峰值、脉冲上升时间与持续时间、脉冲重复频率、中心频率、带宽以及发射端等效输出阻抗等特性参数进行测量与校准. 相似文献
9.
随着材料技术的发展,复合曳引钢带代替钢丝绳已成为电梯行业发展的新趋势.为便于对电梯钢带内部缺陷进行无损检测,介绍一种电梯钢带探伤仪,对其使用场景及应用需求进行分析,确定产品外观,并对该产品的总体结构以及各主要部件的设计方案进行详细阐述.利用Pro/Engineer软件对钢带探伤仪结构进行参数化的建模及装配,最后通过制作样品模型进行验证,结果表明钢带探伤仪的结构设计合理.相关设计过程及结构设计方案,可以为今后类似产品的开发提供一种新的设计思路,具有重要的指导意义. 相似文献
10.
11.
高速模数转换器AD9057在数字化超声波探伤仪中的应用 总被引:1,自引:1,他引:0
高速模数转换器是数字化超声波探伤仪中的位高速模数转换器AD9057的应用,主要涉及AD9057的主要性能特点和它在数据采集电路中的分时存取系统中的应用以及其中的关键技术与方法. 相似文献
12.
13.
It is shown that the flaw detectability of the magnetic-powder inspection method depends on the ratio of the normal H
n and tangential H
t components of the field in the flaw's vicinity and that H
n/H
t < 3 is a condition that ensures the detectability of surface flaws. 相似文献
14.
15.
A surface flaw model is proposed. The model describes the magnetic field topography H
d for normal magnetization by an alternating field H
of frequency . It is shown that H
d can be presented as two cofactors: one cofactor describes a dependence of the topography on coordinates x, z and parameters of a flaw (depth h, opening width 2b), and another cofactor describes its dependence on the electrophysical properties of a tested material containing the surface flaw (specific conductivity , and the relative magnetic susceptibility ). Transition from the magnetostatic field of a flaw = 0 to a quasi-stationary field for magnetization under an alternating field H
0s
of frequency is carried out using the model proposed for the magnetic field of a surface flaw under normal magnetization. 相似文献
16.
17.
It is well known that the depth of magnetization of a rail tested by the high-speed magnetic method depends on two factors, namely, eddy currents and the magnetic viscosity of the rail steel. Both factors act simultaneously, and it is very difficult to separate them in order to estimate the degree of influence of each factor on magnetization of the rail. In the present study a method for distinguishing the effect of the magnetic viscosity of the rail steel against of a background of the eddy-current process is proposed. Real data on the parameters of the magnetic viscosity of the rail steel are given and the possibility of taking its effect on rail magnetization into account is discussed. 相似文献
18.
论述了最近两年变压器励磁涌流保护判据的研究现状,由附加相位判别的自适应二次谐波制动原理、半波傅立叶算法、不同区域平均等效瞬时电感比值到一些新型学科在涌流判据中的运用,并对其进行了分析和评价,最后提出了励磁涌流判据以后的研究方向。 相似文献
19.
20.
研究了有挤压油膜阻尼器、转子与静子碰摩和转轴上的横向裂纹等多种非线性因素作用下的转子系统的非线性响应特征。数值研究发现 ,这类转子系统具有丰富的非线性特性 ,三条通向混沌的道路都存在 ,即阵发性通向混沌、倍周期分叉通向混沌和拟周期通向混沌的道路。系统响应的最大振幅曲线包含了大量的跳跃现象 ,发生这些跳跃所对应的参数点与周期解分叉的参数点相重合 (以前已经发现了这种跳跃现象 ,但没有发现与周期解分叉有关系 )。保持不平衡参数在一个小区间内能够使系统抑制多种故障引起的振幅 ,并使系统能够保持稳定的周期一解。较大的挤压油膜阻尼器参数对系统的振动有明显的抑制作用。当裂纹正方向与不平衡方向成反方向时 ,系统具有最小的振动幅度。 相似文献