Effect of a dc magnetic field on the isothermal martensitic transformation in the Fe-24%Ni-4%Mn alloy

Effects of a dc magnetic field on the isothermal martensitc transformation in the region of the kinetic maximum of the Fe-24%Ni-4%Mn alloy and on the martemsitic transformation at a liquid-helium temperature were studied. It was shown that a dc magnetic field markedly affects the isothermal martensitic transformation. In particular, it shifts the temperature range of the martensitic transformation and the kinetic maximum toward higher temperatures and initiates the nucleation of isothermal martensite crystals and their subsequent growth upon isothermal holding. A dc magnetic field of a sufficiently high strength causes the intense formation of athermal martensite at the liquid-helium temperature, at which no transformation develops without a magnetic field. A comparison of the effects of the pulse and dc magnetic fields on the martensitic transformation in the alloys with martensite transformation isothermal kinetics was carried out

MULTIFUNCTIONAL RASTER MOTION SENSOR

Background. Modern sensors as sources of information determine the level of quality of informationmeasuring and control systems of complex industrial-technological objects, especially in such science-intensive fields as power engineering, aviation, rocket-space technology, weapons and military equipment, etc. One of the tasks in the development of rocket-space systems is the measurement and control of movements of mechanical systems. The existing displacement sensors are not capable of simultaneous measurement of angular and linear movements. To solve this problem a displacement sensor was developed, which has extended functionality and is able to measure linear and angular movements simultaneously. Materials and methods. The amplitude-logic method of processing modulated signals from a raster displacement sensor was used in this work. In the course of the work, a design diagram of a multifunctional displacement sensor and a schematic diagram of the secondary converter were developed. Results. As a result of the conducted research, the possibility of creating a multifunctional displacement sensor capable of working in a wide temperature range of 20 ÷ 600 ℃, capable of simultaneously measuring linear and angular movements was confirmed

MATHEMATICAL MODEL OF A TRANSFORMER LINEAR DISPLACEMENT SENSOR

Background. At present, the efficiency of development and operation of modern automated systems of control and management of various technological processes is largely determined by the technical and economic characteristics of the primary transducers of information (sensors) among which the important place belongs to displacement sensors. The mathematical model of mutual inductive linear displacement sensors underlying the calculation algorithm developed on the basis of the solution of the boundary electrodynamic problem of interaction of a homogeneous alternating field with an electromagnetic rod is considered. Materials and methods. The systems of Poisson's and Laplace's equations with respect to the vector potential were used in this work. Results. As a result of this research, a mathematical model was proposed, which was used in the development of the TDS designed to measure the movements of the solar panels of a satellite vehicle in open space conditions