Smart Flow Control Processes in Micro Scale

In recent years, microfluidic devices with a large surface-to-volume ratio have witnessed rapid development, allowing them to be successfully utilized in many engineering applications. A smart control process has been proposed for many years, while many new innovations and enabling technologies have been developed for smart flow control, especially concerning “smart flow control” at the microscale. This Special Issue aims to highlight the current research trends related to this topic, presenting a collection of 33 papers from leading scholars in this field. Among these include studies and demonstrations of flow characteristics in pumps or valves as well as dynamic performance in roiling mill systems or jet systems to the optimal design of special components in smart control systems

Precision Dynamometer Brake for Gear Testing

Dynamometer is a common type of device that measures the force, torque or power in a system. Current dynamometer brakes have the problem of generating unstable torque during operation. This project aims to design a new dynamometer brake that provides braking with low torque ripple. The final design utilized viscous shear braking which was proven by Atlas Copco experiments to be capable of providing stable torque. To fix design parameters, the team performed fluid dynamic calculations and heat transfer simulations. Detailed design drawings were created and a product prototype was manufactured and tested. Though the final prototype performance was affected by precision limits in manufacturing, the model met several design requirements and showed potential of stable torque generation

A review of gerotor technology in hydraulic machines

Over the years, numerous investigations have established the gerotor fundamentals. This work aims to provide a complete review of the literature from the last decade, focusing on the articles published in the past five years on gerotor technology in hydraulic machines. The report gives a catalogue of guidelines based on the trochoidal-envelope definition, a background analysis, the worldwide distribution of articles in each continent and country and the most frequently used keywords in the field. The paper identifies state-of-the-art research, and reports on current mainstream ideas. From the historical background, this literature review reports the current approaches in gerotor pumps (geometry and performance approaches, modeling and numerical simulations), orbital motors and new concepts. The report will serve as a guide and a directory for novel engineers working with gerotor technology in hydraulic machines. Another intention of this paper is to disseminate the works of the researchers who use this technology around the world, and to provide a scenario for future international collaboration. The paper gives an account of the disparity between academia and engineering applications. There is currently very little published literature on design and production methodologies for gerotor pumps and orbital motors. Hence, the future goal is to collect recommendations that combine academia and industry expertise to make better use of these extensive studies in the fieldPostprint (published version

Millmerran Power Station ROM coal blockage removal system

[Abstract]: Millmerran Power Station (MPS) consists of two units with each unit producing 420 MW of electricity. The coal is delivered to the plant by off road type trucks and unloaded into a 500 MT hopper. The ROM (run of mine) coal is processed through a series of crushing stations and coal handling (storage/reclaim) systems, and delivered by overland conveyor to the power plant silos. MPS, as a coal fired station, is wholly dependent on a consistent and reliable supply of coal to maintain operating efficiency. MPS has been experiencing inefficiencies in their ROM coal supply because of constant blockage issues at the receiving hopper. This blockage is a direct result of large lumps of coal coming from the mine. The blockages interrupt the supply of coal potentially lowering the fuel supply to the power station. Currently, an excavator is hired to clear up the blockage which could be utilised more effectively elsewhere. This introduces an extra cost to the mine in terms of both money and inefficiency. MPS is seeking an engineering design solution to this problem. The elimination of the blockages through an automatic system without increasing any safety risks is highly desirable as that would result in a cheaper and smoother operation of the mine. A literature review on the current coal handling system of MPS was essential in order to be able to develop a design that is suitable for MPS. In this investigation, five conceptual designs with the most appropriate design, in terms of meeting the specified criteria, was analysed and detailed. It was found that the simpler and more effective the design, the higher its practicality in terms of reaching the desired objectives. This enabled an overall cost estimate budget to be produced, which would be the major deciding factor on the implementation of the design. The results of this investigation will aid in gaining an understanding of the overall general solution for the ROM coal blockage problem at MPS. Both design and engineering solutions have been recommended in this dissertation. This will lead eventually to a more automated, safer, efficient and cost effective operating environment

Valves timing of compressor for CO2 refrigerant

V posledních několika desetiletích se objevuje snaha o snížení firemních nákladů, stejně tak jako nákladů, které je nucen vynaložit zákazník, čímž se společnosti snaží získat výhodu vůči svým konkurentům na trhu. Spolu s tímto trendem jde i neustálá snaha snížit dopady na životní prostředí. Vývoj stávajících produktů se proto zdá být klíčovým prvkem. Tento dokument se zabývá vývojem pístového kompresoru na CO2 chladivo, který vyrábí společnost Emerson Climate Technologies. Cíl práce je zvýšit COP kompresoru při zachování stávající životnosti kompresoru. Diplomová práce je rozčleněna do několika kapitol, které se zabývají analýzou originálního designu kompresoru, návrhem a vyhodnocením designů nových. Nezbytné teoretické základy mohou být také shlédnuty v počátečních kapitolách. V poslední části dokumentu jsou sdělena možná další vylepšení a případné jiné konstrukce. Vývoj byl zaměřen na sestavu ventilové desky. Na základě několika předpokladů a výsledků analýzy původního designu kompresoru byly navrženy nové konstrukce, které byly dále testovány statickou strukturální analýzou. Pomoci modální analýzy byly také vypočteny vlastní frekvence a vlastní tvary sacího jazýčku. Mimo modální a statické strukturální analýzy byla provedena také CFD analýza. V posledním kroku byly testovány navržené prototypy a jejich výsledky byly porovnány s původním kompresorem. K správnému návrhu bylo zapotřebí programové podpory a to především v podobě MATLABu, ANSYSu WB a Microsoft Excelu. V práci jsou velmi často prezentovány obzvláště výsledky získané v programu ANSYS WB.Together with an endeavour to decrease companies’ costs and costs of their customers, significant effort to decrease an impact on the environment in the last decades was made. To do so a development is the crucial step. This paper is focused on a development of a CO2 reciprocating compressor, which is produced by Emerson Climate Technologies. The diploma work goal is to increase the compressor COP, while maintaining its durability. The document is divided into a few chapters, which address an analysis of an original compressor design, a description of a new design proposals and an evaluation of the new designs. Necessary theoretical knowledge base is also provided. In the last document part, can be read about other design possibilities and improvements. The main compressor part, for the development, was a valve plate assembly. Base on a few assumptions and original valve plate analyses, the new designs were suggested and subsequently tested as static structural problems. Natural shapes and frequencies of suction valve were determined by modal analysis. Apart from the modal and static structural analyses a CFD analysis was performed. In the last step, prototypes were tested and results were compared with the original compressor design. Software support was necessary for successful designing, thus mainly MATLAB, ANSYS WB and Microsoft Excel were used. Especially results obtained in ANSYS WB are frequently presented in this work.

Volume 1 – Symposium

We are pleased to present the conference proceedings for the 12th edition of the International Fluid Power Conference (IFK). The IFK is one of the world’s most significant scientific conferences on fluid power control technology and systems. It offers a common platform for the presentation and discussion of trends and innovations to manufacturers, users and scientists. The Chair of Fluid-Mechatronic Systems at the TU Dresden is organizing and hosting the IFK for the sixth time. Supporting hosts are the Fluid Power Association of the German Engineering Federation (VDMA), Dresdner Verein zur Förderung der Fluidtechnik e. V. (DVF) and GWT-TUD GmbH. The organization and the conference location alternates every two years between the Chair of Fluid-Mechatronic Systems in Dresden and the Institute for Fluid Power Drives and Systems in Aachen. The symposium on the first day is dedicated to presentations focused on methodology and fundamental research. The two following conference days offer a wide variety of application and technology orientated papers about the latest state of the art in fluid power. It is this combination that makes the IFK a unique and excellent forum for the exchange of academic research and industrial application experience. A simultaneously ongoing exhibition offers the possibility to get product information and to have individual talks with manufacturers. The theme of the 12th IFK is “Fluid Power – Future Technology”, covering topics that enable the development of 5G-ready, cost-efficient and demand-driven structures, as well as individual decentralized drives. Another topic is the real-time data exchange that allows the application of numerous predictive maintenance strategies, which will significantly increase the availability of fluid power systems and their elements and ensure their improved lifetime performance. We create an atmosphere for casual exchange by offering a vast frame and cultural program. This includes a get-together, a conference banquet, laboratory festivities and some physical activities such as jogging in Dresden’s old town.:Group A: Materials Group B: System design & integration Group C: Novel system solutions Group D: Additive manufacturing Group E: Components Group F: Intelligent control Group G: Fluids Group H | K: Pumps Group I | L: Mobile applications Group J: Fundamental

Advances in Fluid Power Systems

The main purpose of this Special Issue of “Advances in Fluid Power Systems” was to present new scientific work in the field of fluid power systems for hydraulic and pneumatic control of machines and devices used in various industries. Advances in fluid power systems are leading to the creation of new smart devices that can replace tried-and-true solutions from the past. The development work of authors from various research centres has been published. This Special Issue focuses on recent advances and smart solutions for fluid power systems in a wide range of topics, including: • Fluid power for IoT and Industry 4.0: smart fluid power technology, wireless 5G connectivity in fluid power, smart components, and sensors.• Fluid power in the renewable energy sector: hydraulic drivetrains for wind power and for wave and marine current power, and hydraulic systems for solar power. • Hybrid fluid power: hybrid transmissions, energy recovery and accumulation, and energy efficiency of hybrid drives.• Industrial and mobile fluid power: industrial fluid power solutions, mobile fluid power solutions, eand nergy efficiency solutions for fluid power systems.• Environmental aspects of fluid power: hydraulic water control technology, noise and vibration of fluid power components, safety, reliability, fault analysis, and diagnosis of fluid power systems.• Fluid power and mechatronic systems: servo-drive control systems, fluid power drives in manipulators and robots, and fluid power in autonomous solutions

Influence of centrifugal compressor system components on its general rotordynamic characteristics

Nowadays most countries are depending on Oil and Gas for their energy supply. In such operations, centrifugal compressors are dominating most of the used critical machines hence it is important to give these turbomachines more consideration in terms of their technical performance and reliability. Centrifugal compressors are one of many turbomachines that require technical solutions for Enhanced Oil Recovery (EOR). The oil and gas fields have different production environments which require adequate selection of compressors to handle the variance in gas and oil specifications and this in turn force the equipment manufacturers to revise their currently used design specifications. This research presents different types of compressors and their work principles with an emphasis on centrifugal compressor components The literature review carried in this research describes different cases in turbomachinery rotordynamics where failures were encountered at the commissioning and operation stages. Also the literature shows how these machines are improved technically by improving the compressor components performance such using Pocket Damper seals and tilting type bearings. The aim of this research is to study the factors affecting Rotordynamic behaviour of large natural gas centrifugal compressors. The study will review the influence of various conditions of rotor components such as bearings, seals, impellers, etc on the overall Rotordynamic stability at various process conditions ... [cont.]