COMPUTER SIMULATION OF POWER SUPPLY FOR LIGHT EMITTING DIODES WITH TWO CURRENT’S SOURCES

The article provides results of engineering design of switching power supply for light-emitting diodes with application current’s sources. Propose a schematic design on base PWM-controller with two transistor keys. Represented results of computer imitation design of power supply at CAD TINA-TI on base of engineering design spice macros IC of PWM-controller.

AUTOMATIC METHOD DETERMINATION OF PARAMETERS STRATEGY OF DIVERGENCE OF VESSELS BY THEIR COURSES CHANGE

In the publication is specified, that providing of safe divergence of vessels at sailing in the straitened waters is one of most the issue of the day of accident-free of navigation. Therefore, straitened districts of sailing with especially intensive motion for the control of process of navigation by the stations of traffic control of vessels which for providing of safe divergence of vessels must dispose by modern facilities of warning of collision of vessels, reducing influencing of human factor of operator by the use of methods of automatic determination of strategy of divergence of vessels at their external management. Actuality of development of method of automatic determination of parameters of strategy of divergence of vessels by the change of their courses is determined to these. The analysis of the last achievements and publications is resulted in work, the decision of the considered problem and selection of parts unsolved before is begun in which. It is shown that for the decision of problem of warning of collisions of vessels was used method of nonlinear integral invariance, methods of theory of optimum discrete processes, and also methods of differential game theory. The method of warning of collision of vessels by displacement on a line parallel of way of ship and method of flexible strategies of divergence of vessels got development, allowing to form optimum strategy of divergence of ship with a few dangerous targets taking into account substantial factors. The publication contains analytical dependence of values of courses of deviation of vessels providing their divergence on minimum - possible distance of rapprochement, without taking into account inertia. It is specified, that for optimum of maneuver of divergence is needed, that increases of courses and were minimum, and as the criterion of optimum the sum of their squares is chosen. It is shown that without taking into account inertia of ship at a turn distance of the shortest rapprochement appears less minimum-possible distance on a size which depends on the increase of relative coordinates of vessels in times of turn and relative course of their deviation. Procedure of progressive approximations is offered for the calculation of courses of deviation of vessels taking into account their inertia and the algorithm of calculation of course of deviation is represented. Set by the values by the increases of courses from - 60° to 60°, the courses of deviation of the second ship settle accounts, which the courses of deviation of the first ship taking into account the dynamics of vessels and increase of his course are determined on. Every maneuver of divergence is characterized by the criterion of optimum, thus the maneuver of divergence gets out as optimum, at which the criterion of optimum is minimum. A situation is resulted in the publication, for which the computer imitation program expected the optimum courses of deviation of vessels. By the computer program, playing of maneuver of divergence of vessels with the got courses of deviation was produced.

Assessment of roadability and stability of a vehicle movement on the bend

The paper presents the mathematical model and the technique of computer imitation of a vehicle movement on bend. Research of roadability and stability of the truck and the schedules illustrating change of characteristics of the steered movement have been obtained. The critical modes of the movement causing separation of wheels from road surface and side slippage have been defined. Speed limit of the steered movement on trajectory of the set curvature have been determined. Keywords vehicle, wheel, cross and longitudinal reactions of the road, inertia force, inertial moment, trajectory of a vehicle movement, angles of withdrawal of wheels, spring weight angle of heel, side slippage, vehicle drift

Dynamic Design and Computer Imitation of Belt Conveyor with Horizontal Curves

The dynamic design of a large belt conveyor with horizontal curves was studied in this paper. The method of calculating its running resistance was obtained by analyzing the orienting force and resistance on the curving parts of the belt conveyors. Dynamic equation of belt conveyor with horizontal curves by using discrete finite element model was established integrating the line-running parts and the curve-running parts. Additionally, dynamic analysis software of belt conveyor with horizontal curves was developed. Through simulation on real time system, start-up process and braking process were analyzed. The deviation of the belt was analyzed based on the tension, and the effect of curve running on belt conveyor was discussed.

Analysis of Dynamic Characteristics of the Magnetostrictive Power Ultrasonic Transducer

The giant magnetostrictive material (GMM) is a novel smart material based on magnetostrictive effect, and it is well suited to power ultrasonic transducer. Based on electromagnetic theory and vibration theory, the design and working principle of the magnetostrictive power ultrasonic transducer has been explained. This paper analyzed the dynamic characteristics of giant magnetostrictive materials under the outside magnetic field and deduced the wave equation of Terfenol-D rod, and the steady-state solution to the equation was obtained under given excitation. The speed and acceleration expressions of Terfenol-D were deduced by differentiating with respect to displacement equation. Based on developing mathematical models, computer imitation was made, and the result of modulation was analyzed from external conditions of transducer and inner structure of magnetostrictive material.

THE STRUCTURE PRINCIPLE OF SILICON MICROMACHINED GYROSCOPE DRIVEN BY THE ROTATING CARRIER

The structural principle of a novel silicon micromachined gyroscope, driven by the rotating carrier's angular velocity, is presented in this paper. The authors construct the mathematical module of the micromachined gyroscope and the dynamics parameters of the micromachined gyroscope are also analyzed and calculated. The signal detecting circuit of the micromachined gyroscope is described. The micromachined gyroscope uses capacitive variation to sense angular velocity and such operation principle is demonstrated in the paper. Then, the signal processing circuit of the micromachined gyroscope is analyzed in detail. Finally, the finite element analysis tool — ANSYS software is used to analyze the oscillation module and frequency response of the micromachined gyroscope. The theoretical research and computer imitation have certified that the structural principle of the silicon micromachined gyroscope driven by rotating carrier's angular velocity is correct.