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TECHNICAL UNIVERSITY - SOFIA: Recent submissions

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Title: Разработване на учебни курсове по темпус договор “Обучение и практика по приложна механика и теория на системите с компютърно ориентирани приложения” Author: 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 Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Безрезонансни трептения с течно и сухо триене Author: Петров, Тодор; Petrov, Todor Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Оценка на трибологичното поведение на смазочни материали на фирма “Дуралюб” - България Author: Янков, Александър Евгениев; Yankov, Alexander Evgeniev; Кавалджиев, Станчо Йорданов; Kavaldjiev, Stancho Jordanov Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Analytical expressions for the stress distribution in a 4-node isoparametric finite element Author: Tenchev, Rosen Tenchev; Тенчев, Росен Тенчев Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: The stress sampling points and the convergence of the h — adaptive finite element method Author: Tenchev, Rosen Tenchev; Тенчев, Росен Тенчев Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Якостен критерий за материали с различно съпротивление на опън и натиск Author: Стойчев, Георги Борисов; Stoychev, Georgy Borisov; Тущев, Камен Николов; Tushtev, Kamen Nikolov Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Определяне на статичните и динамичните еластични и демпфиращи характеристики на реални металогумени съединители Author: Полихронов, Георги Тодоров; Polihronov, Georgi Todorov Date: 1995 Abstract: 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. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Специфична деформационна работа при кос удар с конус по безкрайна мембрана Author: Карапетрова, София Василева; Karapetrova, Sophia Vasileva Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване влиянието на отклонението от размерите на контактната двойка шайба- вътрешна лагерна гривна при търкалящи лагери тип RS върху момента на триене Author: Карапетрова, София Василева; Karapetrova, Sophia Vasileva Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Self-exited oscilllations within mixed friction regimes when reading the hydrodynamic theory of lubrication Author: Butchvarov, Stefan Nikolov; Бъчваров, Стефан Николов; Karapetkov, Stanimir Mihailov; Карапетков, Стефан Михаилов Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Оценка на ергономичните качества на работното място на мотокар универсален високоповдигач с полуеластично окачване на силовия агрегат Author: Тодоров, Михаил Дамянов; Todorov, Michael Damyanov; Генов, Юлиян Асенов; Genov, Joulian Asenov Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Алгоритъм и числена процедура за идентификация на механичните характеристики на линейни динамични системи Author: Генов, Юлиян Асенов; Genov, Julian Asenov; Чернева, Здравка Тодорова; Cherneva, Zdravka Todorova Date: 1995 Abstract: 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. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Mutual influence Author: Bozmarov, Petko Yordanov; Бозмаров, Петко Йорданов; Bozmarov, Yordan Petkov; Бозмаров, Йордан Петков Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: On the existing of a limit cycle or a class of quasi-linear autonomous systems Author: Raeva, Maya Borisova; Раева, Майя; Bekjarski, Aleksandar Bogdanov; Бекярски, Александър Богданов Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Optimization problems in finite algebraic structures and some applications Author: Bijev, Georgi Todorov; Бижев, Георги Тодоров Date: 1995 Abstract: 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. ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Computer assisted analysis and design for a class of dynamic systems Author: Venkov, Gancho Iliev; Венков, Ганчо Илиев; Krushev, Nedyalko Ivov; Крушев, Недялко Ивов Date: 1995 Abstract: 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 ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Continuity properties of the attainable set of singularly perturbed control system with time delay 1 Author: Slavov, Iordan Ivanov; Славов, Йордан Иванов Date: 1995 Abstract: 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. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: European Common Laboratory for Pedagogical Action-Research and Student-Centred Learning (ELaRA) Date: 2023 Library:
TECHNICAL UNIVERSITY - SOFIA
Title: За приложенията на алгебрата Author: Маринов, Васил; Marinov, Vasil Date: 1995 Abstract: 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 Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Импримитивни N-тькани в двумерно финслерово пространство Author: Панайотова, Галина Стоянова; Panajotova, Galina Stoyanova Date: 1995 Abstract: 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. Library:
TECHNICAL UNIVERSITY - SOFIA