Магнітострикційний рівнемір рідинних середовищ з багатократним відбиттям ультразвукового торсійного імпульсу

Abstract

Candidate of Engineering Science (PhD) thesis in speciality 05.11.13 "Devices and Methods of Control and Determination of Substance Composition" – Volodymyr Dahl East Ukrainian National University, Severodonetsk, 2017. Defence will be held at the meeting of the Specialized Scientific Council D 64.050.09 at the National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2018. The thesis is devoted to solving an important scientific and applied problem – development of the magnetostrictive level sensor of liquid media, which allows to increase efficiency of using capacities by reducing the dead zone, expanding the range and reducing the measurement errors. On the basis of the rheological transformations theory, the electromechanical processes in the magnetostrictive transducer have been researched. Transducers are described by nonlinear differential equations, allowing to study the influence of nonlinearity on the metrological characteristics of the level sensor and to develop measures for their improvement. The mathematical models of the proposed level sensor have been obtained in the analytical form. The study of measurement errors has been performed by the integral-type functional method. The structural scheme of the magnetostrictive level sensor with multiple reflection of the ultrasonic torsional pulse has been proposed, and the algorithms for the measuring information processing and the software for the microprocessor have been developed.