Acoustic-emission testing and diagnostics of the kinetics of physicochemical processes in liquid media

The parameters of acoustic emission (AE) generated during crystal growth and dissolution are described. An explanation of detected radiation is proposed within the framework of the hypothesis of beats during the summation of a large number of vibrations with similar frequencies, which can be generated by both suprapremolecular water complexes and individual molecules. The fundamental possibility of evaluating the kinetics of crystallization, dissolution, and melting processes on the basis of data from AE investigations is shown.     

Acoustic-emission testing of solebars with boxlike cross sections

The changes in the design of the 18–578 solebar with a boxlike cross section required the development of a new scheme of arrangement of acoustic-emission (AE) transducers and improvement of both technique and software. All sources that were detected during AE testing were divided according to their degree of hazard into passive and critically active ones. Location grids that specified the rejection levels were imposed on the tested zones under study. In the refined technique, linear location was used, which made it possible to preserve the reliability of the investigation results and reduce the labor intensiveness of the AE testing.     

Acoustic-emission testing of the strength of metal structures under complex loading

Russian Journal of Nondestructive Testing - The interpretation of the results of acoustic-emission (AE) testing of the states of objects under complex loading, which possess a branched structure...     

Acoustic-emission testing and diagnostic of hazardous dynamic processes in a coal seam

Information content of various measured acoustic emission (AE) parameters of coal seams is analyzed. A concept for selection of informative features of AE signals has been formulated. The emergence of delta-coupling of AE acts has been detected on early stages of destruction. The paper suggests determining the onset of a predestructive state by detecting deviations of statistical characteristics of AE pulses from their stable forms (adequate to purely random processes). A technique for diagnosing the predestructive state and for estimating the concentration and growth rate of flawed sites based on positions of extremal points on curves of AE pulse frequency is described.     

X-ray testing and engineering diagnostics

The possibility of using data obtained via X-ray testing as information about an object’s quality is considered. Such an option is discussed for a computer-aided version of this approach for engineering diagnostics of welded joints tested with an X-ray method.     

Monitoring and diagnostics of pipe components

Defects that appear in the production of oil and gas pipe components are systematized and classified. Methods of monitoring the manufacturing quality of pipe components are outlined.     

Acoustic-emission testing of curvilinear fuselage panels of an RRJ airplane in life tests

The technique of acoustic-emission testing of curvilinear fuselage panels of an RRJ airplane in life tests is considered. Specimens are loaded with a distributed mechanical load and pressurization with an air overpressure.     

Prospects of the application of nondestructive testing to the diagnostics of nano- and microstructural materials

This paper covers some aspects of the application of nondestructive testing methods to the diagnostics of nano- and microstructural materials. The questions of improving the resolution of the experimental techniques for the visualization and analysis of nano- and microstructural objects are discussed. The potentials of acoustic methods used to gain information on nano- and microheterogeneities in inspected objects are demonstrated.     

Thermal testing and diagnostics of the engineering state of flat heaters under real exploitation conditions

A method of on-line thermal testing and diagnostics of the engineering state including estimation of the residual life, of flat heaters under conditions of production and operation has been developed using solution of the inverse ill-posed problem of thermal testing. Recently performed experimental studies of hardware and software have shown the possibility of application of this technique in real field exploitation conditions.     

单晶硅的光谱响应测试技术研究

为实现对硅光电池光谱响应的快速、准确在线测试,开发一种硅光电池光谱响应测试软件系统.该系统采用三光栅单色仪、光源、样品室、精密锁相放大器、斩波器等作为硬件设备.该系统以VC++6.0为开发平台,具有高精度、高准确度,对外界干扰小等优点.并对硅光电池的光谱响应进行详细地分析、计算,表明与实测结果吻合.单晶硅的光谱响应的起...     

A calorimetric probe diagnostics for neutral and charged components of a rarefied plasma flow

A procedure for diagnosing flows of nonequilibrium rarefied plasma using cylindrical and flat calorimetric probes also connected as a Langmuir probe has been developed. It is shown that this procedure can be used to determine the full set of local values of the main kinetic parameters for the neutral and charged components of a collisionless plasma flow.     

Luminescent convertors of X-ray radiation for medical and engineering diagnostics and systems for nondestructive testing

The efficiency of using luminescent radiation convertors based on luminophors with different chemical compositions in X-ray diagnostics is evaluated. The dependences of the spectral sensitivity of radiation convertors in the energy range from 10 keV to 20 MeV are given. It is revealed that a higher radiative contrast is reached during X-ray diagnostics of items made of plastic and Al-Mg alloys using luminescent convertors based on “light” luminophors.     

Magnetic-powder testing of components using magnetic indicator packages

Applications of magnetic indicator packages to magnetic-powder NDT are discussed. The sensitivity of this NDT technique can comply with GOST 21105-87 State Standard. The widthd of the deposited powder ridge as a function of magnetic field and flaw parameters is analyzed. The widthd can be used as either a criterion of the field magnitude or a characteristic flaw parameter.     

Manufacturing and testing of X-ray imaging components with high precision

1Introduction X rayimagingtechnologyhasbeenoneof themostimportantresearchcontentssince RoentgendiscoveredX rayin1895.Initially,X raywasusedtostudytheinternalstructureof substancesbycontactradiography.Thespeci menisplacedincontactwithaphotographicfilm duringtheX rayexposure.Theimageofthe specimenisdisplayedafterdeveloping.The methodhasbeenuseduntilnow,anditiswidely appliedinmedicaltreatmentandinnerflawsde tectionofindustrialmaterials.Sincetherefractiveindicesofmaterialsin X rayrangearelowert…     

Adsorption kinetics of components on liquid metal solution surfaces

A device for studying adsorption processes in metals and alloys is described. The big-drop technique employed in the device allows for studying the adsorption kinetics of a surface-active component on a liquid binary alloy surface by the time changes of the surface tension of a freshly formed surface. The lead adsorption on the surface of a series of tin-lead alloys was studied at a temperature of 520 K.     

采煤机液压件的性能试验

众所周之，采煤机械工作条件恶劣，故对液压系统的可靠性要求较高。并且液压系统若在工作中出现故障。不易检查和排除。随着液压技术在采煤机械上的广泛应用。通过对液压系统和元件进行试验和检测来判断其使用性能显得越来越重要。     

Eddy-current nondestructive testing of long cylindrical components using spatial magnetic field components of different frequencies

The feasibility of the eddy-current nondestructive testing using two orthogonal harmonic components of the driving magnetic field has been studied. The paper describes the practical implementation of the method in a flaw detector testing ferromagnetic rods and pipes and designed for detecting elongated flaws with small gradients of longitudinal parameters.     

Acoustic-emission study of the possibilities of localizing flaws of a welded joint during cooling

A method of localizing acoustic-emission signals from flaws of a welded joint during its cooling is considered. Aluminum and titanium inserts were used to simulate flaws of the welded joint. The developed technique of clustering made it possible to exclude noise accompanying the processes of welding and cooling the welded joint. The welded specimens were tested on an MTS-50 loading machine. At the finishing stage, specimens with double-sided welded joints containing titanium inserts were subjected to metallographic analysis.