Polobyuk T. The computerized acoustic system of fluid leak detection in pipelines of the heat-and-power equipment

Object of researches – acoustic processes which arise in the pipeline owing to a liquid leakage (working substance) under pressure. The rybota purpose – increase in sensitivity and reliability of detection of leakages of liquid in pipelines of the heat power equipment on the basis of more complete accounting of features of the probabilistic nature of acoustic signals of a leakage and their one-dimensional cumulant functions. For the solution of objectives methods of technical diagnostics are used; theories of signals and systems; probability theory, accidental processes and mathematical statistics; mathematical analysis. Theoretical and practical results, novelty: the model of forming of diagnostic signals which considers process of generation of acoustic signals of leakages, their distribution and hindrances which at the same time arise is for the first time offered; application of model of Poisson pulse processes and their generalization – linear accidental processes for the description of acoustic signals of leakages of liquid in the pipeline is for the first time reasonable that allowed to consider physics of emergence of these signals; the method of detection of acoustic signals of a leakage of liquid based on one-dimensional cumulant functions is for the first time developed that allowed to increase reliability of diagnosing and sensitivity to leakage size; dependences of one-dimensional cumulant functions of a signal of a leakage on the size of a leakage and pressure in a pipe are for the first time established that allowed to find leakages at early stages of damages of pipelines; installation is developed for physical modeling and pilot study of signals of leakages of liquid in the pipeline and a technique of a research of acoustic signals on it; methods, algorithms and programs which are realized in the created computerized speaker system of detection of signals of leakages of liquid which allow to automate process of diagnosing with the increased reliability and sensitivity are developed. Subject and extent of implementation: theoretical and practical results are implemented at Institute of technical thermophysics of NAN of Ukraine, LLC NPP Mashinobuduvannya; separate results of dissertation work are implemented in educational process at "Devices and Systems of Nondestructive Control" department of instrument-making faculty of NTUU "KPI" in case of development of materials within discipline "Technical and medical systems of nondestructive control". Sphere of use: for development of techeiskatel, systems of monitoring and diagnostics of pressure pipelines.