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Proceedings of the Technical university of Sofia, 1995 -: Recent submissions

Now showing items 121-140 of 853

Title: Масова конфигурация на равничен механизъм с минимална вариация на кшетичната енергия Author: Вълчев, Иван Георгиев; Valtchev, Ivan Georgiev Date: 1995 Abstract: The papers deals with the problem of controlling the fluctuation of the kinetic energy of a linkage through redistribution of mass of links. A criterion for minimization is proposed, in a derived form of a superposition of first and second harmonics of each of controlled parameters. A computational procedure is realized, based on detached ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Сравнителен геометричен анализ на профилите на генераторни гърбици за вълнови предавки Author: Гълъбов, Витан Борисов; Galabov, Vitan Borisov; Андонов, Аспарух Любомиров; Andonov, Asparuch Lubomirov Date: 1995 Abstract: A complete geometrical analysis is done of the most spread profiles of generator cames for harmonic drives with the aim to control their elaboration and decoding (he existing cames. It is made a geometrical analysis of the came profiles by comparison of their extreme radii of curvature and the relations of the semi-axis of their evolutes Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване на демпфирането в опорите на вретената на металорежещи машини Author: Борисов, Борислав Стоянов; Borisov, Borislav Stoyanov Date: 1995 Abstract: The paper deals with results of an investigation of the dam¬ping capacity of double-row plain roller bearings with adjustable radial clearance used as a machine tool spindle bearing in connection with its radial clearance/tightness. Damping capacity of spindle bearings is discussed taking into account type of the thrust bearing when spindle ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване на устойчивостта на металорежещи машини на ocнoвaтa на линейни и нелинейни математични модели Author: Борисов, Борислав Стоянов; Borisov, Borislav Stoyanov Date: 1995 Abstract: A program package for machine tool dynamic stability investigation is created on the base of linear and non-linear mathematical models. The program package makes it possible to investigate the dynamic behavior of machine tool parts and the same of the machine tool as whole at the first stages of engineering design. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Елементи на изрязвания слои метал при фрезоване с профилни фрези с конструктивно подаване по профила на зъбите Author: Данаилов, Панчо Костов; Danailov, Pancho Kostov Date: 1995 Abstract: The cut and it* dimension* - local thickness of cut, width of cut and cross-sectional area of the cut ha* considered in Billing with a convex half-round Milling cutter with interrupted cuting edje* - constructive feed motion. The local thickness of cut (hi) ha* defined as a difference between spherical radius R and radius of curvature JO ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Профилна фреза с конструктивно подаване по профила на зъбите Author: Данаилов, Панчо Костов; Danailov, Pancho Kostov Date: 1995 Abstract: It has considered a convex half-round Billing cutter with interrupted cuting edjes, so called silling cutter with constructive feed notion along the tool profile. This silling cutter has changed and controllable diagraa of the cut - the profile diagraa has changed with serial one. The serial diagraa has realized with chip divide channels ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Експериментално изследване на силите нл рязане при нестационарен процес на фрезоване Author: Георгиев, Иван Андонов; Georgiev, Ivan Andonov; Петров, Димитър Крумов; Petrov, Dimilar Krumov Date: 1995 Abstract: Cutting forces at non-stationary milling process are defined using a new created method and statistical models for relative cutting forces are found. A trigonometric transform between cutting forces in fixed and moving coordinate systems is used and the theoretical model is verified using statistical simulation Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Моделиране силите на рязане при нестационарен процес на фрезоване Author: Петров, Димитър Крумов; Petrov, Dimilar Krumov; Георгиев, Иван Андонов; Georgiev, Ivan Andonov Date: 1995 Abstract: The cutting forces at non-stationary face milling are anaiized. At the each moment of cutting the cross section as well as the mean integral value of cutting metal depth are defined by computer simulation. It is assumed that the relative cutting forces are function of all the cutting process parameters. At the each moment of cutting both ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Третиране на стъпални свредла на установка "УЛТРАМИТ" Author: Македонски, Александър Иванов; Makedonski, Alexander Ivanov Date: 1995 Abstract: Treatment of step drills at "ULTRAMIT" stand Alexander Makedonski Under the actual conditions of production at "G. Kostov" Company - Sofia the tested meta 1-cuting tools are compared on their cuting possibilities, expressed by the durability T- respectively the number of the holes bored in the part "Body". The purpose of the test is that ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Компютърно моделиране и изработване на релефни изображения при производството на формообразуващи инструменти Author: Чешмеджиев, Борислав; Cheshmedjiev, Borislav; Todorov, Nikola Todorov; Тодоров, Никола Тодоров Date: 1995 Abstract: A description and analysis of a method for computer aided design and manufacture of 3D relieves from 2D pictures Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Точност при електрохимично формо¬образуване с тристъпални инструменти Author: Георгиев, Асен Панайотов; Georgiev, Asen Panayiotov Date: 1995 Abstract: The article on the basis of analysis of the process of electrochemical shape-formation with constant feed spead of the electrode discover basic dependences between the errors of reproduction of the sizes of three-stepped tools on the worked parts and certain specific factors.The dependencies have been worked out make possible to determine ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Влияние на условията на работа върху силите на затягане при кръгли ексцентрици Author: Йорданов, Георги Добрев; Jordanov, George Dobrev; Недялков, Александър Стоянов; Nedialkov, Alexander Stoyanov Date: 1995 Abstract: The influence of the acting forces in tightening workpieces with round excentrics is experimentally examined. The factors specifying the working conditions are the material and workpiece roughness, the existance and the kind of coolant fluid, the excentrics magnitude the duration of the tighteng-force inulience ets. It is determined, that ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Моделиране на процеса на сглобяване с неподвижен компенсатор Author: Диков, Ангел Антонов; Dikov, Angel Antonov Date: 1995 Abstract: Elaborating model of process of assemble with immovable compensator incloudsralaboration of project task; simulation of process of assembly in case of determinated by design of project task with registration of possible modifications of industrial conditions. The computer program is elaborated on the basis of suggested model and inculated ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Кръгли ексцентрици с постоянна сила на затягане Author: Недялков, Александър Стоянов; Nedialkov, Alexander Stoyanov; Йорданов, Георги Добрев; Jordanov, George Dobrev Date: 1995 Abstract: It is well known that the round excentrics do not provide a constant tightening force of their working profile. This fact is due to the vari¬ance of the slop angle on different points of the profile. In the paper a design of a device ensuring constant tightening force of the working profile of the round excentrice is described. It compensates ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Възможности за оптимизиране на динамичното поведение на металорежещите машини при отчитане на контактните повърхнини чрез пресмятане по МКЕ Author: Попов, Георги Тодоров; Popov, Georgi Todorov; Тодоров, Георги Димитров; Todorov, Georgi Dimitrov; Романов, Борислав Георгиев; Romanov, Borisslav Georgiev; Врабевски, Борислав Борисов; Vrabevsky, Borisslav Borisov; Камберов, Константин Христов; Kamberov, Konstantin Hristov Date: 1995 Abstract: In this article are examined the possibilities for building and optimization of the dynamic behavior of the machine-tools at including the influence of the sticked areas by building by the Finite Element Method / FEM / and by the resources of the modal analysis. It is evaluated the behavior of the separate structural modules and their ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: ГЛОБАЛНИЯТ ПРОБЛЕМ - ТЕХНОЛОГИИ (или рамките на индустриалното развитие) Author: Somlev, Penko Penkov; Сомлев, Пенко Пенков Date: 1995 Abstract: This is examination of the influence of the consumption of energy, concretly of a petrol, on the development of the technologies and society in generaly. It is shown that the technologies have a influence on the consumption of energy and in big degree determine the influence of the goverments on the international relations Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване на програмируем токоизточник за електроекстракция на метали Author: Захариев, Светлозар; Zahariev, Svetlozar; Димитров, Димитър; Dimitrov, Dimitar Date: 2009 Abstract: The process of metal extraction of solution with low and middle concentration is of great interest. It is worked out with programming current sources. A programming current source for impulse current with computer process control is represented. Block-structural scheme and algorithm of the developed and investigated source is shown. Well ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Енергийна ефективност и светлинни технологии Author: Василев, Христо Николов; Vasilev, Hristo Nikolov Date: 2009 Abstract: The modern tendencies in a lighting technology and lighting energy efficiency are discussed in the paper. A review of the problems in that area is made. The global measures taken for improvement of the lighting efficiency and their influence on the methods and equipment used in lighting installations are pointed. The impact of those new ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Ограничаване на блуждаещите токове при постояннотоков релсов електрически транспорт Author: Петкова, Полина; Petkova, Polina Date: 2009 Abstract: DC electrical grid system for railway transport feeding in Bulgaria uses track rails as a return path (feeder) to the substation. When this type of feeding is used the underground utility structures and the transportation equipment are exposed to active corrosion because of the stray currents going from the rails to the earth. Overview of ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Интелигентни системи на електрически инсталации Author: Иванов, Захари Александров; Ivanov, Zahari Alexandrov Date: 2009 Abstract: Everybody wants from us to make main comfort, security of the appliances, as well to better the quality of his life. New technology EIB for intelligent systems of electric facilities that considerably will relieve our life is made. It is the goal of the present work for it clarifies this new technology with her particularities and the ... Library:
TECHNICAL UNIVERSITY - SOFIA