Contactless nondestructive inspection method and measuring system for the thermophysical characteristics of materials, with adaptive compensation for heat loss

1997 ◽  
Vol 40 (8) ◽  
pp. 780-785
Author(s):  
V. N. Chernyshov ◽  
A. V. Terekhov ◽  
M. V. Makarov
Keyword(s):  
Heat Loss ◽  
Nondestructive Inspection ◽  
Measuring System ◽  
Adaptive Compensation ◽  
Thermophysical Characteristics ◽  
Inspection Method

Nondestructive Inspection Methods for Railroad Castings

2010 ◽  
Author(s):  
Daniel Carter ◽  
Kari Gonzales
Keyword(s):  
Magnetic Particle ◽  
Phased Array ◽  
Field Tests ◽  
Ultrasonic Pulse ◽  
Nondestructive Inspection ◽  
Inspection Method ◽  
Technology Center ◽  
Pulse Echo ◽  
Inspection Techniques

Transportation Technology Center, Inc. (TTCI) has investigated various nondestructive inspection (NDI) methods to determine if they are capable of reliably inspecting side frames, bolsters, knuckles, and couplers. The NDI methods used for this investigation include dry and wet (fluorescent) magnetic particle, liquid penetrant, alcohol wipe, visual, ultrasonic (pulse-echo and phased array), and radiography. Inspection results from all methods were used to determine which methods produced repeatable results. From the initial inspection analysis, TTCI engineers determined that the magnetic particle inspection method is the most capable for detecting defects in railroad castings. Further investigation of the magnetic particle technique was completed to develop reliable inspection methods for use on bolsters, side frames, knuckles, and couplers. Each of the inspection techniques have been used for inspections in the field. Using the results of the field tests, procedures were developed by TTCI and submitted to the Association of American Railroads’ (AAR) Coupling Systems and Truck Castings Committee for review and implementation. The inspection procedures can be used by manufacturers, railroads, and car repair shops. Limitations of the inspection procedures include the amount of time necessary to perform the inspection and the reliability of detecting certain types of defects below the surface of the casting. Although these limitations exist, the procedures developed by TTCI are expected to improve the quality of in-service castings and reduce the number of train partings and derailments due to broken or cracked components.

Application of a Compensation Inspection Method in Geodynamic Monitoring

2015 ◽  
Vol 799-800 ◽  
pp. 989-993 ◽  
Author(s):  
Artem Bykov ◽  
Igor' Kurilov ◽  
Oleg Kuzichkin
Keyword(s):  
Transfer Functions ◽  
Block Diagram ◽  
Piecewise Linear ◽  
Linear Functions ◽  
Measuring System ◽  
System Of Equations ◽  
Piecewise Linear Functions ◽  
Geoelectric Section ◽  
Inspection Method ◽  
Geodynamic Monitoring

The paper proves the application of a compensation testing method for geodynamic monitoring when using multi-pole electrical systems. The transfer functions of a geoelectric section are presented as a system of equations, whose coefficients are determined at the initial setup of the measuring system. The block diagram of the compensation method application for geodynamic monitoring based on a multi-pole electrical system is given. Approximation in terms of continuous piecewise-linear functions will be used to distinguish the geodynamic offset vector of the geoelectric section. A system of equations for defining the geodynamic offset vector through the approximation vector by continuous piecewise-linear functions on a recorded geoelectric signal error is considered.

scholarly journals Nondestructive Inspection Method for Jet Engine Turbine Blades

1973 ◽  
Author(s):  
I. R. Kraska ◽  
W. L. Berndt
Keyword(s):  
Air Force ◽  
Eddy Current ◽  
Turbine Blades ◽  
Nondestructive Inspection ◽  
Inspection Method ◽  
Jet Engine ◽  
One Stage ◽  
Trailing Edges ◽  
Depot Maintenance ◽  
Edge Cracks

Nondestructive inspection of jet engine turbine blades during field and depot maintenance is accomplished normally with fluorescent penetrant and/or visual techniques. In spite of the widespread use of the penetrant process, it has many disadvantages as a maintenance inspection method. The reliability of penetrant inspection depends upon the preparation of the blades prior to actual penetrant processing and the inspector’s skill in detecting and evaluating defect indications. The process can miss cracks if they are filled with material that blocks the penetrant from entering the defect. An eddy current technique which can detect leading and trailing edge cracks in turbine blades and an instrument based upon this technique were developed under Air Force sponsorship. The instrument has been tested in a rework facility and field maintenance. Results of the evaluation and photomicrographs of typical cracks detected in turbine blades are presented. Results are compared, in some instances, to results obtained with the fluorescent penetrant and/or visual examinations. A field penetrant inspection of leading trailing edges detect cracks at an inspection rate of one stage in 1 hr and 50 min.

Study on Nondestructive Inspection Method of Single-Lap Adhesive Joints to Eliminate the Influence of Inspector's Behavioral Characteristics

2018 ◽  
Vol 774 ◽  
pp. 283-288
Author(s):  
Genj Hotta ◽  
Yoshifumi Ohbuchi ◽  
Hidetoshi Sakamoto
Keyword(s):  
Adhesive Strength ◽  
Adhesive Joint ◽  
Shear Test ◽  
Nondestructive Inspection ◽  
Behavioral Characteristics ◽  
Tensile Shear ◽  
Cohesive Failure ◽  
Inspection Method ◽  
Adhesive Effect ◽  
The Relationship

In this study, we conducted a tensile shear test according to JIS K 6850 for a simple superposed adhesive joint, and as a result, it was found that the expected adhesive strength can be obtained only when cohesive failure occurs. The surface enlarged length was measured from a micrograph that observes the surface texture of the boundary between the adhesive and the adherents, and it was found that cohesive failure occurred when the length was longer than a certain length. Surface enlarged length is a new way of thinking. It measures the length of the ridgeline of the unevenness in the microscopic photograph of the surface roughness. By doing so, we can quantitatively determine the effective adhesive length. Effective adhesion length is the length of adhesion of the adhesive as viewed microscopically. We can know the adhesive effect by examining the effective adhesive length. Therefore, we found the relationship between the surface enlarged length (= effective adhesion length) of the bonding interface of the simple superposed adhesive joint and the adhesive strength. Then, it was verified whether adhesion strength could be predicted by setting the standard surface enlarged length as a threshold. As a result, we developed a nondestructive inspection method that can estimate the failure mode after the tensile test.

MICROWAVE HEATING IN THE SYSTEM OF NON-DESTRUCTIVE TESTING OF THE THERMOPHYSICAL CHARACTERISTICS OF BUILDING MATERIALS AND PRODUCTS

2020 ◽  
pp. 38-43
Author(s):  
S. A. Mordasov ◽  
A. P. Negulyaeva ◽  
V. N. Chernyshov
Keyword(s):  
Building Materials ◽  
Control Point ◽  
Measuring System ◽  
Non Destructive Testing ◽  
Thermophysical Characteristics ◽  
Destructive Testing ◽  
Information Measuring System ◽  
Pulse Form ◽  
Non Destructive ◽  
Frequency Pulse

A new method is proposed for determining the thermophysical characteristics (thermal conductivity and thermal diffusivity) of building materials and products according to the results of measurements at two points in time of the surface temperature of the object under study, which is subjected to pulsed thermal effect from a given power focused into the line of microwave radiation. In the proposed method, the number of pulses and their repetition rate are set adaptively when the steady-state excess temperature is reached at the control point with two predetermined values at two points in time, which allows non-destructive testing of the studied objects, since the preset temperature values are taken 20…30 % less temperature thermal decomposition of the studied materials, as well as receive information in the frequency-pulse form, which increases the accuracy of the control results and noise method To implement the proposed method, a microprocessor-based information-measuring system has been developed that has experimentally confirmed the efficiency of the method and the correctness of its theoretical conclusions.

scholarly journals Humidity Distributions in Multilayered Walls of High-rise Buildings

2018 ◽  
Vol 33 ◽  
pp. 02045 ◽  
Author(s):  
Olga Gamayunova ◽  
Tatiana Musorina ◽  
Alexander Ishkov
Keyword(s):  
Energy Consumption ◽  
Heat Loss ◽  
Energy Efficient ◽  
Large Scale ◽  
Thermophysical Characteristics ◽  
Large Cities ◽  
High Rise ◽  
Heat Resistant ◽  
Temperature And Humidity

The limitation of free territories in large cities is the main reason for the active development of high-rise construction. Given the large-scale projects of high-rise buildings in recent years in Russia and abroad and their huge energy consumption, one of the fundamental principles in the design and reconstruction is the use of energy-efficient technologies. The main heat loss in buildings occurs through enclosing structures. However, not always the heat-resistant wall will be energy-efficient and dry at the same time (perhaps waterlogging). Temperature and humidity distributions in multilayer walls were studied in the paper, and the interrelation of other thermophysical characteristics was analyzed.

Sign in / Sign up

Export Citation Format

Share Document