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TECHNICAL UNIVERSITY - SOFIA: Последно депозирани

Показване на публикации 61-80 от 905

Заглавие: Разработване на учебни курсове по темпус договор “Обучение и практика по приложна механика и теория на системите с компютърно ориентирани приложения” Автор: Лилов, Любомир Кръстев; Lilov, Liubomir Krastev; Чернева-Попова, Здравка Тодорова; Tchemeva, Zdravka Todorova; Бъчваров, Стефан Николов; Butchvarov, Stefan Nikolov; Банов, Стефан Борисов; Banov, Stefan Borisov; Николов, Светослав Славов; Nikolov, Svetoslav Slavov Дата: 1995 Резюме: The development of new course is given: “System Theory and Control of Movement”, “Applied Mechanics”, “Vibrations, Vibroprotection and Noiseprotection of Machines ”, “System Identification ”, “Application of Computer Technics in Mechanics Curricula, other activities are described in connection with the aim of the contract — improvement of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Безрезонансни трептения с течно и сухо триене Автор: Петров, Тодор; Petrov, Todor Дата: 1995 Резюме: There are investigated in the paper disturbed oscillations with the dissipative forces of wet and dry friction origin, in the resulting motion exists no the phenomenon “resonance ”. The disturbed oscillations amplitude does not depend on the disturbed frequency and the amplitude is a constant during the time when the last frequency ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Оценка на трибологичното поведение на смазочни материали на фирма “Дуралюб” - България Автор: Янков, Александър Евгениев; Yankov, Alexander Evgeniev; Кавалджиев, Станчо Йорданов; Kavaldjiev, Stancho Jordanov Дата: 1995 Резюме: The paper deals with particular results from tribological parameters tests of lubrication products of the company Duralube—Bulgaria”. Small quantities of these products added to lubricant oils decrease briskly friction losses and wear in contact joints. Laboratory analyses carried out through original method and test equipment show quite ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Analytical expressions for the stress distribution in a 4-node isoparametric finite element Автор: Tenchev, Rosen Tenchev; Тенчев, Росен Тенчев Дата: 1995 Резюме: For the general displacement isoparametric finite elements the displacement field is approximated by a polynom. Since the strains are first derivatives of the displacements and FE post-processors usually use the nodal stress values and polynomial shape function to approximate the stress field it is a common mistake made by FE users to as ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: The stress sampling points and the convergence of the h — adaptive finite element method Автор: Tenchev, Rosen Tenchev; Тенчев, Росен Тенчев Дата: 1995 Резюме: The nodal stresses in a finite element may be calculated in two ways: (a) directly at the nodes; (b) by extrapolation from the stresses at the Gauss points. It will be shown by means of numerical examples, involving plane 8-node isoparametric elements, that the convergence of stresses in areas of stress concentration is superior -when using ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Якостен критерий за материали с различно съпротивление на опън и натиск Автор: Стойчев, Георги Борисов; Stoychev, Georgy Borisov; Тущев, Камен Николов; Tushtev, Kamen Nikolov Дата: 1995 Резюме: A new failure criterion for materials with different strength in tension and compression is proposed. Experiments with tube specimens made from different types of cast iron with tensile strength 100, 150 and 200 MPa and biaxial stress state -^=co, 1, 0.5, 0, -2, -oo and pure forstonwere carried out. The proposed criterion is in good agreement ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Определяне на статичните и динамичните еластични и демпфиращи характеристики на реални металогумени съединители Автор: Полихронов, Георги Тодоров; Polihronov, Georgi Todorov Дата: 1995 Резюме: In paper a methodic for determination of static and dynamical stiffness char¬acteristics of elastic clutches is proposed. It is tested for determination of real metal-rubber clutches for tram use characteristics. From experimental investigations was established that this methodic can be used for all kinds elastic clutches. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Специфична деформационна работа при кос удар с конус по безкрайна мембрана Автор: Карапетрова, София Василева; Karapetrova, Sophia Vasileva Дата: 1995 Резюме: The distribution of the specific strain work is established for the problem of an oblique impact with a cone on an infinite membrane (for the case where the transverse wave is propagated in the plane area only); this work being general, for the change in shape, and for that in volume. The distribution has been built for both areas of the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изследване влиянието на отклонението от размерите на контактната двойка шайба- вътрешна лагерна гривна при търкалящи лагери тип RS върху момента на триене Автор: Карапетрова, София Василева; Karapetrova, Sophia Vasileva Дата: 1995 Резюме: A formula has been theoretically derived, which gives the relationship be¬tween the rated dimensions of the contact couple (sealing washer-inner bearing ring) and the frictional moment between these elements. On the basis of this formula a PC program has been also written. By using the relationship obtained, the effect of the deviation of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Self-exited oscilllations within mixed friction regimes when reading the hydrodynamic theory of lubrication Автор: Butchvarov, Stefan Nikolov; Бъчваров, Стефан Николов; Karapetkov, Stanimir Mihailov; Карапетков, Стефан Михаилов Дата: 1995 Резюме: Abstract: This paper deals with a dynamics model with two degrees of freedom on the basis of which a profound analysis is made about initiation and behavior of the self-exited oscillation. At the same time reads the hydrodynamics action of lubrication and dry friction with its dynamic performance. The different equations are solved in ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Оценка на ергономичните качества на работното място на мотокар универсален високоповдигач с полуеластично окачване на силовия агрегат Автор: Тодоров, Михаил Дамянов; Todorov, Michael Damyanov; Генов, Юлиян Асенов; Genov, Joulian Asenov Дата: 1995 Резюме: This paper is a continuation of the paper / //. In [ 11 is presented one mathematical model of a counterbalanced engine-driven fork-lift truck with half-elastic suspension of an engine and a hydrodynamic transmitter. This scheme is traditional for small trucks and it provides their optima! lengths. The engine with hydrotransmitter is directly ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Алгоритъм и числена процедура за идентификация на механичните характеристики на линейни динамични системи Автор: Генов, Юлиян Асенов; Genov, Julian Asenov; Чернева, Здравка Тодорова; Cherneva, Zdravka Todorova Дата: 1995 Резюме: Based on frequency analysis of input excitations and object reactions the transfer function is obtained. Then coefficients are approximated by least squares method. The mechanical characteristics are optioned by solution of non-linear system of equations using optimization procedure. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Mutual influence Автор: Bozmarov, Petko Yordanov; Бозмаров, Петко Йорданов; Bozmarov, Yordan Petkov; Бозмаров, Йордан Петков Дата: 1995 Резюме: The mutual influence is considered between a multitude of identical, homogeneous and uniformly distributed vector fields, and a finite number of singular points, situated in isotropic, limited, three-dimensional space. The mutual influence is realized according to the given formulation of the problem. The obtained results are connected with ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: On the existing of a limit cycle or a class of quasi-linear autonomous systems Автор: Raeva, Maya Borisova; Раева, Майя; Bekjarski, Aleksandar Bogdanov; Бекярски, Александър Богданов Дата: 1995 Резюме: The quasi-linear autonomous systems have some interesting performances. It is shown in this article on existing of a limit cycle for a class of these systems. This class is defined and it is proofed a theorem for some cases. A computer program allow to make a visualization of the decisions of these systems. This show the exists of the limit ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Optimization problems in finite algebraic structures and some applications Автор: Bijev, Georgi Todorov; Бижев, Георги Тодоров Дата: 1995 Резюме: Some methods and algorithms for computer investigations in finite algebraic structures, connected with optimization problems are considered in this paper. The application field could be investigations of the structures themselves as much as optimization problems. A minimum generating set (MGS) B of a given finite structure S is constructed. ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Computer assisted analysis and design for a class of dynamic systems Автор: Venkov, Gancho Iliev; Венков, Ганчо Илиев; Krushev, Nedyalko Ivov; Крушев, Недялко Ивов Дата: 1995 Резюме: The structure and the main functions of the interactive system MOODS, developed by the autors, are described. This software system for optimization and visualization is applied for designing a class of dynamic systems. Two main problems are considered. The first problem deals with design via optimization of robust linear dynamic system with ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Continuity properties of the attainable set of singularly perturbed control system with time delay 1 Автор: Slavov, Iordan Ivanov; Славов, Йордан Иванов Дата: 1995 Резюме: A linear control system with time delay /h>0 and "small" real parameter e>0 in derivatives is considered. The behavior of the multifunction "(e, h)—> attainable set at the moment T" when I:,h >0' is investigated. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: European Common Laboratory for Pedagogical Action-Research and Student-Centred Learning (ELaRA) Дата: 2023 Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: За приложенията на алгебрата Автор: Маринов, Васил; Marinov, Vasil Дата: 1995 Резюме: In this paper some researches of polylinear algebra are pointed popularly. There are some facts about the applications of mathematics in the technics. Some author's algebraical problems are published in the second pan Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Импримитивни N-тькани в двумерно финслерово пространство Автор: Панайотова, Галина Стоянова; Panajotova, Galina Stoyanova Дата: 1995 Резюме: In this paper are treared imprimhive n-tisstis in F. The concept imprimitives n-tissues concerning one-parameter Lie's group is defined, It also contains some special cases: imprimitive lines in F; imprimitives nets in F; imprimitives three-tissues in F. Библиотека:
TECHNICAL UNIVERSITY - SOFIA

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