This paper studies a method for active electrohydraulic force compensation in industrial scale high power applications. A valve controlled cylinder moves a mass using the force of inertia to compensate for the reaction forces of an industrial process. Two strategies for force compensation are developed and investigated in a 160 ton clamping unit of an injection moulding machine to significantly reduce the excitation. Results of the different strategies are shown and evaluated. Advantages and drawbacks of the developed electrohydraulic force compensation are discussed.

The aim of this thesis is to analyze the possibility of mechanical design platform lifts. Proposal lifting platform with mechanical and hydraulic drive with a capacity of 3500 kg and lift 600 mm. The work is mainly focused on design and strength calculation mechanism and structure. Proposal hydraulic circuits and the development drawings for both types of drive.

The diploma thesis deals with construction design mechanically rake screens with hydraulic drive. The diploma thesis is composet of several parts, in a first past is an overwiew of mechanical method of cleaning screams. The second part deals of diploma thesis deals with product design rakes raking mechanism. The third part is an analysis of machine parts and describe their functions. It is then carried out stress analysis using fine element methods (FEM) in the program I-deas.

This master’s thesis deals with the design of hydraulic linear drive for parallel kinematics structures of robots, which is not standardly used for these kind of robots. In the part of background research it deals with modern applications of these robots in profession and possible construction components, conventional or nonconventional ones. The master’s thesis further describes the procedure of construction the hydraulic drive. At first the linear hydromotor is designed and further the whole hydraulic circuit. The whole drive is processed in appropriate software program as a 3D model, from witch the assembly drawings is worked out.

This master thesis deals with design of hydrostatic drive for harvester. It contains calculations of parameters from current drive like speed, hydraulic losses and tractive effort. Because now these parameters are insufficient in next part of work is proposed few options how to achieve required parameters. In selected cases are made calculations and based on the results are recommended two options for realization.

Работа посвящена моделированию устройства затравки для машины непрерывного литья заготовки(МНЛЗ) ЭСПЦ ПАО "ММК" в программном пакете Matlab. В первом разделе: описаны основные виды разливки стали, выполнен обзор конструкции аналогичных МНЛЗ по литературным материалам, что позволило рассмотреть конструктивные особенности аналогичных машин, технических характеристик и принципов действия МНЛЗ. А так же была рассмотрена работа кристаллизатора МНЛЗ, конструкция устройства затравки в ЭСПЦ ПАО «ММК». Во втором разделе: описана общие особенности гидроприводов, далее описан гидропривод устройства затравки, рассчитан и выбран гидроцилиндр(ГЦ), рассчитаны основные расходы жидкости в ГЦ, проверена устойчивость ГЦ во время работы, расчёт произведён в системе компьютерной алгебры Matcad, выбрана рабочая жидкость, а так же её альтернатива. Раздел три посвящен: построению кинематики и постановке кинематических связей механизма затравки в Matlab, построению 3d моделей основных частей устройства, настройке рабочих блоков, а так же настройке работы тянущей клети. Раздел четыре посвящен: построению гидропривода механизма затравки в Matlab, построению рабочих блоков и их настройка, настройке работы распределителя гидропривода, переводу сигнала гидравлики в возвратно- поступательную работу кинематики. Пятый раздел подводит итоги работы: проверка результатов и их анализ, а так же предложения по дальнейшей модернизации системы. / This work is devoted to simulation of the dummy bar for the continuous casting machine of the electric furnace shop of Public Joint Stock Company " Magnitogorsk Iron and Steel Works" in the "Matlab" environment. In the first section: the main types of steel casting are described, a review of the design of similar CCM’s according to literary materials is carried out, which allowed us to consider the design features of similar machines, technical characteristics and principles of operation of CCM. The work of the CCM crystallizer, the design of the dummy bar in the electric furnace shop of MMK PJSC was considered as well. In the second section: the general features of hydraulic drives are described, the hydraulic drive of the dummy bar is further described, the hydraulic cylinder (HC) is calculated and selected, the main fluid flow rates in HC are calculated, the stability of HC during operation is checked, the calculation is made in the Mathcad computer algebra system, the working fluid is selected, as well as its alternative. Section three is devoted to: building kinematics and setting kinematic connections of the dummy bar in Matlab, building 3d models of the main parts of the device, setting up working blocks, as well as setting up the operation of the withdrawal-roll set. Section four is devoted to: the construction of the hydraulic drive of the dummy bar in Matlab, the construction of working blocks and their adjustment, the adjustment of the hydraulic drive distributor, the translation of the hydraulics signal into the reciprocating operation of kinematics. The fifth section summarizes the results of the work: verification of the results and their analysis, as well as proposals for further modernization of the system.

В результате условий эксплуатации коммунальной техники снижается надёжность гидравлических систем, повышаются затраты на техническое обслуживание и резко снижается производительность машины в целом. Для выявления недостатков гидропривода щеточного узла коммунальной машины и разработки мероприятий по их устранению, необходима имитационная модель с возможностью изменения кинематических и динамических параметров. В ходе данной работы были рассчитаны параметры гидропривода с помощью программы Mathcad, создана твердотельная имитационная модель щеточного узла МК2000 с подключенным гидроприводом используя пакета программ MATLAB Simulink Multibody/Fluids. Наличие имитационной модели позволяет в дальнейшем анализировать изменения в динамике механизма на этапе проектирования; верно подобрать ответственные узлы; уменьшить затраты времени на сложные расчеты; повысить качество построения механизма с исключением человеческих ошибок. / The operating conditions of municipal equipment reduce the reliability of hydraulic systems, increase maintenance costs, and drastically reduce the overall performance of the machine. A simulation model with the possibility of changing kinematic and dynamic parameters is needed to identify the disadvantages of the hydraulic drive of the municipal machine brush unit and to develop measures for their elimination. In the course of this work parameters of hydraulic drive were calculated using Mathcad program, a solid-state simulation model of the sweep gear MK2000 with connected hydraulic drive was created using MATLAB software package Simulink Multibody/Fluids. The simulation model allows further analysis of changes in mechanism dynamics at the design stage; to correctly select responsible units; to reduce time spent on complex calculations; to increase quality of mechanism construction with exclusion of human errors.

This work includes design of the drive hydraulic shears. The objective is to replace diesel-engine for electric motor. There is a description of the machine and its technological shearing process, types of hydraulic drives and their applications. The work includes the design, description and calculation of hydraulic power unit with an electric motor in two versions. Then there is evaluation of alternatives and select one to which they are processed further structural elements.

The main objective of this master's thesis is to design the new conception of hydraulic drive of the baling press CPB 100 with application of modern tendencies in the field of hydraulic engineering. This thesis contains design and calculations of new hydraulic drive, hydraulic circuit diagram and the list of hydraulic elements that are used. Moreover this thesis includes the design of an electrical control and the design of hydraulic block and manifold.

This paper studies a method for active electrohydraulic force compensation in industrial scale high power applications. A valve controlled cylinder moves a mass using the force of inertia to compensate for the reaction forces of an industrial process. Two strategies for force compensation are developed and investigated in a 160 ton clamping unit of an injection moulding machine to significantly reduce the excitation. Results of the different strategies are shown and evaluated. Advantages and drawbacks of the developed electrohydraulic force compensation are discussed.