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

Now showing items 581-600 of 853

Title: Calculation of transient processes in power transformers Author: Vichev, Stanimir Trifonov; Tagarov, Kiril D.; Вичев, Станимир Трифонов; Тагаров, Кирил Д. Date: 1995 Abstract: In this paper are shown computational results a transient swith on phenomena in a traction transformer at open-circuit conditions. These results are compared with experimental results from a series of experiments, conducted in Bulgaria. The good agreement be-tween them made it possible to perform additional computational research that could ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Определяне на токовете в несиметричен кафезен ротор последством симетрични съставки Author: Божилов, Ганчо Йорданов; Младенов, Валери Марков; Иванов, Кънчо Панайотов; Ivanov, Kantcho Panayotov; Bozhilov, Gancho Yordanov; Mladenov, Valeri Markov Date: 1995 Abstract: In this paper an asymmetric state in a cage rotor using symetrical components method is considered. Many cases of asymmetry namely brakings, finite changes of resistances of bars are investigated. Determining of syrnetrical components is done based on set of equations with order much less than number of phases of rotor. A method for finding ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Определяне на токовете при несиметрия в кафезен ротор на асинхронен двигател посредством разсиметриращ генератор Author: Божилов, Ганчо Йорданов; Иванов, Кънчо Панайотов; Младенов, Валери Марков; Bozhilov, Gancho Yordanov; Ivanov, Kantcho Panayotov; Mladenov, Valeri Markov Date: 1995 Abstract: In this paper a state of the currents in asymmetric cage rotors of asynhronous motors is examined. The most common case of asymmetry nattily braking of rotor bar or existance of finite changes of its resistance is considered. A method is proposed based on super-position principle. This method allows the analysis of multiphase asymmetrical ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Regulation of the electric field in the main insulation of power transformers Author: Mavrodiev, Alexandar Atanasov; Мавродиев, Aлександър Атанасов Date: 1995 Abstract: The problem of the electric field in the main insulation of power transformers has been considered. An example with regulation of the field of a EMPY 8330 (10500) / 110 transformer by changing the material, the shape and the position of the construction elements of the main insulation is given. The results obtained from the analysis are discussed. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Effect of the radius of rounding of the shielded rings and the angular insulation washers on the electric field in the main insulation of high voltage power transformers Author: Genov, Stefan Yordanov; Mavrodiev, Alexandar Atanasov; Florov, Petar; Генов, Стефан Йорданов; Мавродиев, Александър Атанасов; Флоров, Петър Date: 1995 Abstract: The problem of the effect of the radius of rounding of the shielded rings and the angular insulation washers on the electric field in the main insulation of high voltage power transformers has been considered. An example with a TM 30000/110 transformer is given. The electric field has been analysed by finite element method. The results from ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Методът на крайните елементи в електротехниката Author: Соколов, Емил Радулов; Sokolov, Emil Radulov Date: 1995 Abstract: The modern state of art of the finite element method for investigation and design of electromagnetic devices is presented. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Contribution to the diagnostics of a turbocharged diesel engine Author: Doleishi, B.; Evtimov, T. P.; Долейши, Б.; Евтимов, Т. П. Date: 1995 Abstract: The paper deals with dismantled diagnostics of the power of turbocharged Diesel engine. For the purpose of diagnostics the transition process of the engine is described by an extended mathematical model that takes into account also the influence of volumes of suction and exhaust piping. The results obtained by this improved model are close ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Работа на ДВГ с растителни масла Author: Димитров, Ангел Йорданов; Иванов, Здравко Динчев; Петров, Петър Георгиев; Dimitrov, Angel Yordanov; Ivanov, Zdravko Dimchev; Petrov, Petar Georgiev Date: 1995 Abstract: The use if plant oils for internal combustion engine operation is alternative for the nearest fears. Their production is relevant to some ecological effect. For now there are some test results for radish and soya oils. At Transport Technic and Technology comparative functional tests have been performed on the engine D3900 with mixtures of ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Tolerance analysis of linear fields using the finite element method in interval form Author: Kolev, Lyubomir Varadinov; Колев, Любомир Варадинов; Ненов, Иво П.; Димитров, Мартин рец. Date: 1998 Abstract: The problem of tolerance analysis of technical devices described by linear partial equations is considered. A new approach to solving this problem is suggested which is based on an appropriate interval representation of the finite element method. Three methods for implementing the new approach are presented and discussed. It is shown that ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване показателите на двигател ВАЗ2101 при работа с различни видове бензин и добавка на вода и метанол Author: Димитров, Ангел Йорданов; Трифонов, Трифон Анчев; Жечев, Славчо Стоянов; Калоянов, Живко Стойчев; Dimitrov, Angel Yordanov; Trifonov, Trifon Anchev; Kaloyanov, Zhivko Stoichev Date: 1995 Abstract: Quantitative and qualitative evaluations have been obtained for the power, economic and toxic characteristics of engine WA 2210,1, as Pr the cylinder hub thermal state for working deem& gasoline and we and alcohol additive. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Избор на оптимална схема за дозиране в автомобилните дизелови двигатели, работещи с двойно гориво Author: Жечев, Славчо Стоянов; Димитров, Ангел Йорданов; Дянков, Дянко Байчев; Zhechev, Slavcho Stoyanov; Dimitrov, Angel Yordanov; Dyankov, Dyanko Baychev Date: 1995 Abstract: The advantages and the shortcomings of double fuel successive and parallel dousing scheme have been analysed, as well as which of the two schemes to apply depending on the concentration of the gaseous fuel and the kind of speed regulator. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване влиянието на диаметъра на нагнетателния тръбопровод в горивната система върху параметрите на горивоподаване и работния процес на високооборотен дизелов двигател Author: Пилев, Димитър Иванов; Жечев, Славчо Стоянов; Пронев, Божидар Томов; Zhechev, Slavcho Stoyanov; Pronev, Bozhidar Tomov Date: 1995 Abstract: Motor test and motorless have been held on the fuel apparatus of the engine D3900 for three sizes of the pressure pipe diameter. The complex character of the research enable to reveal the relation between this parameter and the engine working process and fuel supply parameters. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване влиянието на някои експлоатационни фактори върху избора на основните параметри на алгоритми за енергийно ефективно управление на локомотива Author: Трики, Риад Бен Абделазис; Triki, Riad Ben Abdelazis Date: 1995 Abstract: A number of algorithms for energy saving control of electrical locomotives have been investigated through computer simulation. As a result some conclusions have been drawn about the influence of the type of locomotive, the mass of the train, the average speed and the road profile on the main parameters of these algorithms. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Челни врати за пътнически вагони с пневматично управление Author: Топалов, Стоян Георгиев; Христов, Христо Георгиев; Сотиров, Георги Христов; Topalov, Stoyan Georgiev; Hristov, Hristo Georgiev; Sotirov, Georgi Hristov Date: 1995 Abstract: This paper describes design and control of new type end doors with pneumatic control for passenger coaches A72. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Анализ на механични конструкции при допълнителни ограничения Author: Илиев, Валентин; Iliev, Valentin Date: 1995 Abstract: The subject of paper is analysis of structures with additional displacement constraints. Conditions for existence and uniquness of solution are formulated. Method consisting of nonlinear programming method and finite element method is used to find solution of simple example. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Метод за топлинно изчисляване на ДВГ при частично натоварване и определяне на характеристиките му в целия работен диапазон Author: Димитров, Петър Иванов; Dimitrova, Petar Ivanov Date: 1995 Abstract: A method is described for heating calculation of a vehicle's engine when partially working, having in mind the influence of all factors on the engine's features. The soft ware, developed on this basis, gives the opportunity for production of the features of the designed engine in its full range (including its multiparametre characteristics). Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване на възможностите за производство на вагонни оси у нас Author: Димитров, Жельо Харалампиев; Кирилов, Кирил; Дамянов, Борислав Александров; Dimitrov, Zheljo Haralampiev; Kirilov, Kiril; Damyanov, Borislav Alexandrov Date: 1995 Abstract: A study of the technical and technological capacities of some Bulgarian enterprises for production of railway wagons and passenger cars axes, conforming to the standards of the International Union of Railways, has been carried ow. Some summed up results and conclusions from the fulfilled physical and mechanical tests of railway wagons axes ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Отбивачно съоръжение за метровагони Author: Стоилов, Валери Малинов; Стоилов, Елка Николова; Дамянов, Борислав Александров; Stoilov, Valeri Malinov; Stoilova, Elka Nikolova; Damyanov, Borislav Alexandrov Date: 1995 Abstract: A modern buffer gear for Metro Cars, has been elaborated, which protects the personal and the equipment be accident. It has been developed an the basic of hydraulic energy absorbing elements to take up the kinetic energy. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Методи за аналитично определяне на спирачните маси на ПЖПС въз основа на измерителите „разчетна натискова сила“ при използване на композиционни калодки Author: Тонев, Светлозар; Tonev, Svetlozar Date: 1995 Abstract: Определянето на измерителите на ефективността на спирачните системи - "спирачни маси" въз основа на "разчетените натискови сили" е съществен елемент за безопасността на движението на вагоните на страните от ОНД съоръжени с композиционни калодки. Разработените в миналото от НИТИЖТ и приети от руските железници коефициенти за преизчисляване ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Метод за изпитване и експериментални резултати от изследването на усъвършенствана вагоноизхвъргачка Author: Цанчев, Георги Стоянов; Димитров, Слави Йорданов; Скендеров, Йордан Милорадов; Иванов, Александър Йорданов; Tsanchev, Georgi Stoyanov; Dimitrov, Slavi Yordanov; Skenderov, Jordan Miloradov; Ivanov, Alexandar Yordanov Date: 1995 Abstract: The paper describes a method for experimental investigation on advanced derailing block. Presents are results from investigation of this device of the influence of various regimes on the load per axle, speed of vehicle and type of rail stock. Library:
TECHNICAL UNIVERSITY - SOFIA