Электродвигатель малошумного вентилятора

В данная выпускная квалификационная работа посвящена разработке 3D моделей компонентов электродвигателя ДС-200 малошумного вентилятора специального назначения. Модели были выполнены с помощью программы T-flex. В работе представлены чертежи и рисунку основных деталей, из которых состоит данный двигатель. Почти каждый элемент имеет сложную геометрическую форму, поэтому 3D моделирование электродвигателя – трудоемкая и нетривиальная задача, требующая понимания как формы каждой детали, так и инструментария CAD-системы для создания 3D модели. Электродвигатель ДС-200 состоит из 5 сборочных единиц, около 700 деталей и 200 стандартных изделий. 3D модель каждой детали была выполнена по чертежам, которые предоставил НПЦ "Полюс". В конечном итоге была разработана и собрана 3D модель электродвигателя.In this final qualification work is devoted to the development of 3D models of the components of the electric motor DS-200 low-noise fan for special purposes. Models were performed using the program T-flex. The paper presents drawings and drawing the main parts that comprise the engine. Almost every element has a complex geometric shape, therefore the 3D modeling of the motor is time-consuming and non-trivial task that requires understanding of how shape of each part and the tools of a CAD system to create 3D models. Electric motor DC-200 consists of 5 modular units, about 700 parts and 200 standard products. 3D model of each part was made according to the drawings provided by NPTS "Polyus". In the end, was designed and assembled 3D model of the motor

Zur Verbundverankerung bei Vorspannung mit sofortigem Verbund in Hochleistungsbetonen

Prestressed concrete structures with pretensioned strands have been accomplished for several years. Generally, normal strength concrete with a density of 2.4 kg/dm³ and a cylinder compressive strength up to 50 N/mm² is used. In prestressed concrete, the bond anchorage behavior of prestressing strands is an important constructional element in prefabricated concrete structures and is regulated in DIN 1045-1, DIN 4227, Eurocode 2, Model Code 90 and ACI 318-02. However, there are no verified experimental design rules for the bond behavior of prestressing forces in high-performance concrete, especially for lightweight and self-compacting concrete. Also, a consistent design concept for the transfer length of prestressing forces is missing. In this work, the applicability of existing rules and standards from literature for the bond anchorage behavior has been investigated for high-performance concrete. Based on these investigations, an own design concept has been developed. The bond anchorage behavior of 7-wire-strands and 12mm ribbed bars was investigated in over 400 pull-out-tests, 27 tests for the transfer lengths and eleven beam tests with pretensioned strands in high-strength lightweight concrete and self-compacting concrete. Within the tests, three different types of high-strength lightweight concrete (LC 35/38 with rho = 1.4 kg/dm³, LC 55/60 with rho = 1.6 kg / dm³ and LC 75/85 with rho = 1.8 kg/dm³), and three self-compacting-concrete types (powder-type with fly-ash, powder-type with limestone-powder and combination-type with fly-ash) were tested. At this point, the stress dependent part of 7-wire strands and 12mm ribbed bars, as well as the general bond anchorage behavior in prestressed concrete beams were examined. Based on the experimental test results a modified design approach was developed. Now the code rules for ordinary concrete can be applied to prestressed concrete structures in high-strength lightweight concrete and self-compacting concrete. With these own design proposals to DIN 1045-1 and “DAfStb-Richtlinie” for self-compacting concrete, the normative foundations are available. This is the basis to allow a broader application of these concrete types in Germany. The accompanying nonlinear numerical investigations showed that the bond anchorage behavior can be modelled successfully. However, it is not possible to describe the multiaxial failure behavior of concrete under different load stages. Assuming the engineering boundary conditions the load-deformation-behavior could be simulated in a satisfactory manner