Application of DAC function at the setting of conditional sensitivity of ultrasonic control of rolling stock parts with echo-pulse method
The aim of the article is to develop a method for ultrasonic inspection of the rolling stock parts both in manufacturing tuning out the distance amplitude correction curve (DAC) when and in operation. adjusting the conditional sensitivity of a lateral cylindrical reflector The advantage of applying the method of conditional sensitivity with a diameter of 6 mm, located in the CO-2 measure at a depth is that one CO 2 measure with fixed verified metrological characteof 44 mm, ultrasonic monitoring of railway rolling stock by an echo-ristics is enough to control a fairly wide range of rolling stock parts. pulse method. The disadvantage of this method is that the sensitivity over the The method of adjusting the conditional sensitivity for the CO-2 entire control range will be the same and, accordingly, will lead to measure, which consists in detuning the zero level along the lateral the fact that at the beginning of the monitoring range the small-cylindrical reflector, fixing the value of the amplitude and adding size discontinuities will be classified as unacceptable, while the dis-an additional gain factor, established by the regulatory documen-continuities of the same size at the end of the control range will be tation for control, obtained a wide circulation in various methods of classified as allowable. A mathematical tool is proposed for tuning out the DAC when adjusting the conditional sensitivity along the lateral cylindrical reflector to the CO-2 measure of ultrasonic inspection of parts of the railroad rolling stock. To automate the calculations of the DAC parameters of an ultrasonic flaw detector, the software product NDTRT-23 was developed on the basis of the obtained mathematical tool.