The Experts below are selected from a list of 105351 Experts worldwide ranked by ideXlab platform

Andrea Vacca - One of the best experts on this subject based on the ideXlab platform.

C. R. Burrows - One of the best experts on this subject based on the ideXlab platform.

  • Fluid Power systems—some research issues
    Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2000
    Co-Authors: C. R. Burrows
    Abstract:

    AbstractTraditional areas of application of Fluid Power systems are being challenged by alternative forms of energy transmission. In some cases this is because of environmental concerns associated with noise and leakage, in other applications the lack of systematic design methods for synthesizing Fluid Power systems has led to their replacement by electrical drives. This paper outlines some of the current research studies motivated by these challenges.

  • H ∞ control in Fluid Power
    IEE Colloquium on Robust Control: Theory Software and Applications, 1997
    Co-Authors: I.a. Njabeleke, R.f. Pannett, P.k. Chawdhry, C. R. Burrows
    Abstract:

    Fluid Power systems employ a Fluid medium to transmit Power. They tend to be characterised by severe nonlinearities and model uncertainties arising from component and Fluid characteristics as well as supply pressure variations. In this paper, the feasibility of H∞ control on such systems is examined with application to a speed control test rig. (4 pages)

  • Fluid Power systems design : Bramah's legacy
    Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy, 1996
    Co-Authors: C. R. Burrows
    Abstract:

    This paper gives a brief historical survey of Fluid Power systems. It shows that many current applications can be traced to ideas embedded in the pioneering work of Bramah and later contributors. The demand for high dynamic performance has been satisfied by advances in components and the fusion of technologies. A central theme is the importance of developing effective tools for system synthesis. It is shown that research in progress will ensure a future for Fluid Power in the twenty-first century.

  • Development of computer-based techniques for Fluid Power systems design
    Design Studies, 1995
    Co-Authors: D G Tilley, C. R. Burrows
    Abstract:

    Abstract The Engineering Design Centre (EDC) in Fluid Power systems, was established in the School of Mechanical Engineering, University of Bath in 1992 to develop computer-based techniques for Fluid Power systems design. This paper gives an overview of the research being undertaken at the EDC relating to: system design and performance evaluation using computer simulation; the development of a database for hydraulic components; software tools to minimize noise and vibration; circuit configuration design; and optimization techniques for component selection and sizing.

Hubertus Murrenhoff - One of the best experts on this subject based on the ideXlab platform.

  • The Next Generation of Fluid Power Systems
    Procedia Engineering, 2015
    Co-Authors: Milos Vukovic, Hubertus Murrenhoff
    Abstract:

    Abstract Over the past half century the Fluid Power community has seen the development of a number of new energy efficient components. Despite these improvements on the component level many hydraulic systems still remain inefficient. These losses are mainly due to two reasons. The first relates to economic factors as more efficient systems are usually considerably more expensive. The second reason is poor system designs that frequently force efficient components to operate in regions of low efficiency. The Institute for Fluid Power Drives and Controls (IFAS) in Aachen, Germany is one of a number of institutes worldwide aiming to change this trend in order to secure the future of Fluid Power in industry. IFAS has not only focused on the development of new cost-effective architectures but also on holistic design methodologies aimed at assisting engineers in the design of efficient hydraulic systems. One further strategy has been to enter new fields of application, where the attributes of hydraulic systems, previously considered to be disadvantages, actually become advantages. An example of such a field is the renewable energy sector, where hydraulic drivetrains for wind, wave and marine current Power are currently under development. This paper gives insight into these new developments and briefly summarizes the research into new hydraulic systems currently being conducted at IFAS.

  • Recent sustainability related research results in Fluid Power
    Proceedings of 2011 International Conference on Fluid Power and Mechatronics, 2011
    Co-Authors: Hubertus Murrenhoff
    Abstract:

    Fluid Power is the drive solution when huge forces or torques need to be controlled even with challenging dynamic requirements. This Paper focuses on research results covering the range of innovations from Fluids and tribology with a special view on piston units on the one hand and on hydraulic circuits for new applications such as hybrid drives and hydrostatic drives for wind turbines on the other hand. The survey provides examples where Fluid Power contributes to sustainability. It starts with the Fluid generated from biomass and avoiding losses in tribological systems such as pistons in bores and understanding designs to improve efficiency and leakage. It also introduces new ideas for hybrid solutions in drive trains and work hydraulics. It illustrates the potential to save energy over a load cycle and to recuperate potential and kinetic energy in a hydraulic accumulator. The paper will also show that hydrostatic drives are a viable solution for wind turbines when an intelligent circuit is chosen.

  • Fundamentals of Mass Conservative System Simulation in Fluid Power
    ASME 2009 Dynamic Systems and Control Conference Volume 2, 2009
    Co-Authors: Christian Riedel, Christian Stammen, Hubertus Murrenhoff
    Abstract:

    This article illustrates the development of a dynamic system simulation tool for Fluid Power on basis of mass flows. The goal is to increase the predictability and efficiency of system simulation tools in Fluid Power. State of the art simulation tools make use of simplified differential equations. Especially in closed systems or long-term simulations, the volume flow based approach leads to significant variations of simulation results as balancing of flow parameters and its integrations to potentials lead to a violation of the equation of continuity. However, with a mass flow and energy conservative approach we obtain a clear and physically correct model implemented in the simulation tool DSHplus. The new basis of calculation enables further implementation of thermo-hydraulic and multi-phase flow models such as cavitation or particle transport into the concentrated parametric system simulation.© 2009 ASME

D G Tilley - One of the best experts on this subject based on the ideXlab platform.

  • Thermal-Hydraulic Performance Prediction in Fluid Power Systems
    Proceedings of the Institution of Mechanical Engineers Part I: Journal of Systems and Control Engineering, 1996
    Co-Authors: J A Sidders, D G Tilley, P J Chappie
    Abstract:

    This paper presents a modelling approach to the study of thermal-hydraulic performance in Fluid Power systems. A set of lumped parameter mathematical models are developed which are based on conservation of mass and energy for the system. The theoretical basis and modelling strategy are discussed for an open circuit containing a hydraulic pump, loading valve, heat exchanger and reservoir. Simulation results are presented which show a comparison of model/rig performance, and the agreement obtained demonstrates the validity of the modelling approach. It is shown that the thermal response is dominated by the reservoir heat capacity and that close correspondence between the model and rig is only achievable with accurate hydraulic performance models.

  • Development of computer-based techniques for Fluid Power systems design
    Design Studies, 1995
    Co-Authors: D G Tilley, C. R. Burrows
    Abstract:

    Abstract The Engineering Design Centre (EDC) in Fluid Power systems, was established in the School of Mechanical Engineering, University of Bath in 1992 to develop computer-based techniques for Fluid Power systems design. This paper gives an overview of the research being undertaken at the EDC relating to: system design and performance evaluation using computer simulation; the development of a database for hydraulic components; software tools to minimize noise and vibration; circuit configuration design; and optimization techniques for component selection and sizing.

  • The Use of Multi-Objective Parallel Genetic Algorithms to Aid Fluid Power System Design
    Proceedings of the Institution of Mechanical Engineers Part I: Journal of Systems and Control Engineering, 1995
    Co-Authors: M S Donne, D G Tilley, W Richards
    Abstract:

    This paper describes the use of parallel genetic algorithms to automate the component sizing stage of the design process. Experiences of applying the method to Fluid Power systems are discussed and problems encountered are highlighted. Refinements to the standard parallel genetic algorithm for use as a single objective optimizer and its adaptation for use as a method to locate Pareto optimal solutions of multi-objective optimization problems are described. The multi-objective algorithm is used to optimize a mathematical problem and two Fluid Power circuits.

  • Using computer simulation methods in Fluid Power education
    Proceedings of the JFPS International Symposium on Fluid Power, 1993
    Co-Authors: D G Tilley, Peter Chapple
    Abstract:

    The successful application of hydraulic systems depends to a large extent on the skills and experience of the Fluid Power engineer. The acquisition of these skills, which can only be effectively obtained from appropriate specialised training, is enhanced by the use of practical demonstrations. Although test rigs provide an invaluable aid in the use and application of hydraulic equipment, there are limits to the range of applications that can be demonstrated. The BATHfp computer simulation package is used extensively in system design on the Fluid Power Centre industrial courses. This has been shown to provide considerable benefits in the training of Fluid Power engineers, particularly in the areas which involve complex concepts that are difficult to understand, by enabling engineers to visualise the system performance. This paper presents the results of case studies that highlight the way in which simulation techniques provide assistance in the training process.

  • Approach to the design of Fluid Power systems
    1993
    Co-Authors: Clifford R. Burrows, D G Tilley, K A Edge, P J Chapple
    Abstract:

    The design of Fluid Power systems frequently represents a significant challenge, even to the skilled and knowledgeable designer. This paper identifies the principal features of the design process and draws attention to the role of simulation. It is essential that the creativity of the designer is not stifled and consequently simulation must be acknowledged as an aid, not as part of an automated process. The paper includes a series of examples which illustrate how, through the use of simulation as part of an iterative process, systems may be designed to meet a specification

N.f.b. Diepeveen - One of the best experts on this subject based on the ideXlab platform.

  • On the Application of Fluid Power Transmission in Offshore Wind Turbines
    2013
    Co-Authors: N.f.b. Diepeveen
    Abstract:

    Offshore wind energy is currently characterized by the high costs associated with installation and operation. Gearboxes in particular have been singled out as a key source of the high maintenance costs of offshore wind farms. For a given wind speed, the torque of the rotor increases cubically with the diameter of its swept area. As the maximum size of wind turbines continues to increase, mass reduction and reliability are of growing importance for the system’s economy. In any industry where robust machinery is required to handle large torques, hydraulic drive systems are applied. It is therefore almost the obvious solution for wind turbines. The main components of a Fluid Power drive train are (1) a positive displacement pump, which transforms the mechanical Power of the aerodynamic rotor into a high pressure Fluid flow, and (2) a hydraulic motor, which converts the hydraulic Power back into mechanical Power. The research presented in this thesis is centered around the questions of whether and how the application of Fluid Power technology is feasible as an alternative to currently applied drive train technologies for offshore wind turbines. The approach is to define several possible configurations of the Fluid Power transmission system. From these, a concept using seawater hydraulics for centralized electricity production within an offshore wind farm is subjected to further analysis. Through research, modelling and experiments, the feasibility of this concept, known as the Delft Offshore Turbine is analyzed. To make offshore wind a competitive source of electricity requires more than incrementally improving and scaling-up onshore turbines. The concept for Power transmission as presented in this thesis is shown to be technically feasible and will significantly reduce the complexity of offshore wind energy technology. A way to further prove the functionality and demonstrate the possible use of such a drive train is by building and testing it, preferably in a real turbine, offshore.

  • Dynamic modeling of Fluid Power transmissions for wind turbines
    2011
    Co-Authors: N.f.b. Diepeveen, A. Jarquin Laguna
    Abstract:

    Fluid Power transmission for wind turbines is quietly gaining more ground/interest. The principle of the various concepts presented so far is to convert aerodynamic torque of the rotor blades into a pressurized Fluid flow by means of a positive displacement pump. At the other end of the Fluid Power circuit, the pressurized flow is converted back to torque and speed by a hydraulic motor. The main advantage of a hydrostatic transmission over geared and direct drive systems is the possibility to vary the transmission ratio. Thus it is possible to operate with variable rotor speed (required for maximum energy extraction), whilst using a synchronous generator directly coupled to a grid, thereby eliminating the need for an AC frequency converter and a voltage transformer. Furthermore, hydraulic drives not only have a higher Power density than electrical drives, but their use also allows for alternative arrangements of components. This provides the opportunity to significantly reduce the nacelle mass. Previous publications on Fluid Power transmissions for wind turbines have mostly been focused on the energy efficiency of the system, based on steady state simulations and mea- surements. Little has been mentioned about the dynamic behavior, especially regarding the inherent damping characteristics of Fluid Power transmissions. This paper presents a theoretical model of the Fluid Power transmission and the analysis of the influence of the main design parameters on the dynamic behavior of the system.