Development of improved performance electromagnetic valve for liquid rocket engine

The problem of developing optimal-design electromagnetic valves is relevant for many industries. The development of technology is characterized by increased power and pressures used for actuator mechanisms, as well as by reducing the dimensions and mass of automatic units. The goal of this article is to develop an advanced electromagnetic valve that would ensure optimal combination of high performance, reliability, technological effectiveness and minimal cost. On the basis of standard dependences for electromagnetic phenomena a mathematic model of a SU.1 valve was developed. It was calculated in several special-purpose software packages: NISA, FEMM, ANSYS Maxwell. Parametric analysis was implemented in ANSYS Maxwell for variable working gap settings and values of current force in the solenoid. As a result, the magnetic induction distribution field was obtained. The results of modeling the operation of the electromagnetic valve and the magnetic induction distribution field are presented for variable working gap settings and different values of current force in the solenoid. The model of an advanced electromagnetic valve for a liquid rocket engine was developed on the basis of the dependences obtained. The duration of single engine firing obtained is 40 msec. The results obtained make it possible to create a valve with hold-open time of 800msec, which is considered sufficient for application in electromagnetic direct current valves.

ON APPLICATION OF AMORPHOUS STEELS IN THE MAGNETIC CIRCUITS OF VOLTAGE TRANSFORMERS

The article presents the results of studying the influence of amorphous steels on the antiresonance properties of voltage transformers. The authors developed a mathematical model of a voltage transformer with a magnetic circuit using amorphous steels based on the system of nonlinear differential equations with approximation of the magnetization curve of steel by a hyperbolic expression. The model was applied to the calculation of a voltage transformer with different brands of amorphous alloys. The model of the anti-resonance voltage transformer based on the finite element method and created with the help of the FEMM PC was used to verify the obtained results which made it possible to obtain a graphical representation of magnetic induction distribution in the voltage transformer magnetic circuit.

Influence of the laser welding process on changes in the magnetic induction of the Religa Heart ROT pump

The study addresses the results concerning the laser welding technology of the titanium circulatory support blood pump Religa Heart ROT. Pulse laser welding parameters were determined and selected. The influence of the pulse welding parameters and other conditions of welding process on the magnetic induction distribution of the mechanical circulatory support blood pump was investigated.

Accurate computation of magnetic induction generated by HV overhead power lines

This paper proposes a 3D quasi-static numerical model for the magnetic induction calculation produced by the high voltage overhead power lines by using the Current Simulation Technique (CST) combined with the Particle Swarm Optimization Algorithm (PSO), in order to determine the appropriate position and number of the filamentary current loops for an accurate computation. The exact form of the catenary of the power line conductors is taken into account in this calculation. From the simulation results, the effect of the conductor sag is largely noticed on the magnetic induction distribution, especially at the mid-span length of the power line where the magnetic induction becomes very significant, the maximum magnetic induction strength at 1 m above the ground level recorded at mid-span point is 8.87 ?T, at the pylon foot, the maximum value is significantly reduced to 3.94 ?T. According to these values, we note that the limits set by the ICNIRP guidelines for magnetic induction strength are respected for occupational and public exposure. The simulation results of magnetic induction are compared with those obtained from the 3-D Integration method, a fairly good agreement is found.

ANALYSIS OF THE MAGNETIC FIELD DISTRIBUTION IN THE PARALLEL PLATE RHEOMETER MEASURING SYSTEM

Magnetic fluids are materials whose physical properties can be changed by a magnetic field of a given intensity value. One of the fundamental research areas for determining the properties of magnetic fluids is rheological measurement. The basic method for determining the rheological properties of this type of smart material is by using rotational rheometers equipped with parallel plate measuring geometry. The paper presents the results of numerical simulation and experimental research on the magnetic induction distribution in the working gap for this type of measuring geometry. The conducted analyses allowed the influence of selected parameters on the uniformity of the magnetic field distribution in the magnetic fluid to be determined. The work paid attention to the problems occurring in the development of measuring systems for determining the properties of magnetic fluids under the conditions of a magnetic field.

Diagnosing the automobile starting system

This article presents a new method for analysing the torque of an internal combustion engine using registered electromechanical runs and magnetic field distribution in a starter. The aim of the study was to develop a model of the starting current of an internal combustion engine and carry out verification tests on real objects. The developed model allows to simulate the shutdown of individual cylinders. Experimental research was conducted using the Bosch FSA 740 equipment for four internal combustion engines under variable operating conditions. During testing, the starting current and relative compression in cylinders were recorded. Simulating the variable load of the starter, the magnetic induction distribution of the magnetic induction was recorded in the feed slot. The research will be used to develop a method of diagnosing the starter and determining the torque of the internal combustion engine.