Relevant bibliographies by topics / Digital displacement pump

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Digital displacement pump'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Digital displacement pump"

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Breidi, Farid, Jordan Garrity, and John Lumkes. "Design and Testing of Novel Hydraulic Pump/Motors to Improve the Efficiency of Agricultural Equipment." Transactions of the ASABE 60, no. 6 (2017): 1809–17. http://dx.doi.org/10.13031/trans.11557.

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Abstract. Hydraulic systems are prevalent in agricultural machinery and equipment and can be found transmitting power for vehicle drive wheels, powering attachments, and controlling motion (booms, steering, load height, etc.). Agricultural applications of fluid power have advanced in terms of capability and efficiency, but opportunities remain for significant improvements in efficiency, noise reduction, and reliability. The average system-level hydraulic efficiency of current mobile agricultural machines is only 21.1%. Because nearly all hydraulic systems use pumps to convert engine power to f
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Roemer, Daniel Beck, Per Johansen, Henrik C. Pedersen, and Torben O. Andersen. "Method for Lumped Parameter Simulation of Digital Displacement Pumps/Motors Based on CFD." Applied Mechanics and Materials 397-400 (September 2013): 615–20. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.615.

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Digital displacement fluid power pumps/motors offers improved efficiency and performance compared to traditional variable displacement pump/motors. These improvements are made possible by using efficient electronically controlled seat valves and careful design of the flow geometry. To optimize the design and control of digital displacement machines, there is a need for simulation models, preferably models with low computational cost. Therefore, a low computational cost generic lumped parameter model of digital displacement machine is presented, including a method for determining the needed mod
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Pedersen, Henrik C., Per Johansen, Cemre Yigen, Torben O. Andersen, and Daniel B. Rømer. "Analysis of Temperature's Influence on a Digital Displacement Pump's Volumetric Efficiency." Applied Mechanics and Materials 233 (November 2012): 24–27. http://dx.doi.org/10.4028/www.scientific.net/amm.233.24.

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The focus of the current paper is on a small 18 cm3/rev Digital Displacement Pump (DDP), where it is investigated how temperature influency the pump behaviour and static performance. An experimentally validated model of the DDP is presented, which is the basis for the investigation. From the results it is found that although the temperature highly influences the pump behaviour it is possible to mostly compensate for this by accurately controlling the closing angle of the low pressure valve.
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Edge, K. A., and P. N. Brett. "The Pumping Dynamics of a Positive Displacement Pump Employing Self-Acting Valves." Journal of Dynamic Systems, Measurement, and Control 112, no. 4 (1990): 748–54. http://dx.doi.org/10.1115/1.2896204.

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The paper describes a general purpose digital computer model for the analysis of the pumping dynamics of positive displacement pumps employing self-acting valves. This model is verified by comparison with experimental tests on a diaphragm separator pump. Predicted and simulated cylinder pressure transients and inlet and delivery valve dynamics are compared over the complete pumping cycle. Close agreement between theory and experiment is achieved. The induction performance of the pump is examined in detail and the effects of operating conditions on volumetric efficiency are presented. The effec
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Li, Chunshuang, Xinhui Liu, Xin Wang, Jinshi Chen, and Yuqi Wang. "Optimization of Multi-Way Valve Structure in Digital Hydraulic System of Loader." Energies 14, no. 3 (2021): 700. http://dx.doi.org/10.3390/en14030700.

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In this paper, a digital hydraulic variable control method based on multi-way valve spool displacement feedback is proposed, which combines the advantages of low cost and high reliability of the loader fixed displacement pump hydraulic system, and the distinguished energy saving effect of the loader variable pump hydraulic system. Based on the principle of hydraulic resistance, the mathematical model of flow-pressure of multi-way valve was established. Meanwhile, the theoretical structure of a valve spool suitable for digital hydraulic system was deduced. On this basis, an improvement scheme o
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Sheng, Xiao Ming. "Digital Control Hydraulic Variable Pump Based on Mechatronic-Hydraulic-Air Integration Driven by Compressed Air." Advanced Materials Research 291-294 (July 2011): 2643–46. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2643.

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This paper introduces digital control hydraulic variable pump based on mechatronic-hydraulic- air integration driven by compressed air. By inserting the toggle force amplifier in between double-acting rodless air cylinder and variable pump, this pump, driven by compressed air, utilizes small forced air to create big output power. The displacement of air cylinder piston is measured by using digitally linear displacement sensor and it is compared with input signal by computer in order to control pressure and flow rate output by hydraulic cylinder. This pump provides high flexibility and high rel
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Zagar, Philipp, Helmut Kogler, Rudolf Scheidl, and Bernd Winkler. "Hydraulic Switching Control Supplementing Speed Variable Hydraulic Drives." Actuators 9, no. 4 (2020): 129. http://dx.doi.org/10.3390/act9040129.

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Primary control of linear motion by variable speed electric motors driving a hydraulic cylinder via a constant displacement pump is an established and successful concept with a frequent use in industry. One problem arises when low or zero motion speed has to be realized under high pump pressure conditions. Such load scenarios occur frequently in certain pressing processes, e.g., for sintering or veneering. Most pumps have a lower speed limit, below which critical tribological conditions occur which impair lifespan and efficiency. In addition, pump speed control and pump fluctuation suffer from
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Ehsan, Md, W. H. S. Rampen, and S. H. Salter. "Modeling of Digital-Displacement Pump-Motors and Their Application as Hydraulic Drives for Nonuniform Loads." Journal of Dynamic Systems, Measurement, and Control 122, no. 1 (1997): 210–15. http://dx.doi.org/10.1115/1.482444.

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The digital-displacement pump-motor is a hybrid device, which combines reciprocating hydraulics with micro-processor control, creating a highly integrated machine capable of producing variable flow and power. It is based on the conventional hydraulic piston pump but with actively controlled poppet valves for each cylinder. This allows enabling or disabling on a stroke-by-stroke basis in any desired sequence. Time-domain modeling of the pump-motor system predicts the performance under variable-demand, variable-speed at different control-modes. The advantages of this approach over conventional t
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Pedersen, Niels Henrik, Per Johansen, Anders Hedegaard Hansen, and Torben Ole Andersen. "Model Predictive Control of Low-Speed Partial Stroke Operated Digital Displacement Pump Unit." Modeling, Identification and Control: A Norwegian Research Bulletin 39, no. 3 (2018): 167–77. http://dx.doi.org/10.4173/mic.2018.3.3.

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Pareja-Corcho, Juan, Aitor Moreno, Bruno Simoes, et al. "A Virtual Prototype for Fast Design and Visualization of Gerotor Pumps." Applied Sciences 11, no. 3 (2021): 1190. http://dx.doi.org/10.3390/app11031190.

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In the context of generation of lubrication flows, gear pumps are widely used, with gerotor-type pumps being specially popular, given their low cost, high compactness, and reliability. The design process of gerotor pumps requires the simulation of the fluid dynamics phenomena that characterize the fluid displacement by the pump. Designers and researchers mainly rely on these methods: (i) computational fluid dynamics (CFD) and (ii) lumped parameter models. CFD methods are accurate in predicting the behavior of the pump, at the expense of large computing resources and time. On the other hand, Lu
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Dissertations / Theses on the topic "Digital displacement pump"

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Rampen, William Hugh Salvin. "The digital displacement hydraulic piston pump." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/12829.

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The digital displacement hydraulic piston pump is a hybrid device which combines a microcompressor with an established form of high-pressure pump to create a highly integrated machine which can produce a variable high-power output directly from an electronic command. The actively controlled inlet poppet-valve in each cylinder can be held open against the discharging flow in order to disable it during a single cycle. Cylinders can be disabled in this manner, following a maximally smooth sequence, allowing a controlled output flow to be achieved. A compliant device located near the pump, such as
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Madhusudanan, Jayasurya. "Evaluation of a digitial displacement pump in a load haul dump application." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162594.

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Hydraulics has always been the first choice of actuation in off-road, construction and mining vehicles due to its power density, low cost, built in cooling and lubrication. However, the current state of our environment along with stricter regulations has brought light to newer technologies within hydraulics to improve the existing system. This urge to enhance efficiency and reduce energy consumption has led to a point where new technologies must be evaluated. One such technology is the programmable hydraulic pump called the digital displacement pump (DDP). This new pump may have the potential
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Pellegri, Matteo, Matthew Green, Jill Macpherson, Callan McKay, and Niall Caldwell. "Applying a multi-service digital displacement® pump to an excavator to reduce valve losses." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71185.

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Reducing the energy consumption of off-highway machinery due to poor system efficiency is an urgent challenge. Several advanced and innovative architectures have been proposed over the years to tackle this problem, but very few of them found fertile ground for commercial applications due to increased complexity and cost. In this paper, the design, implementation, and testing of a multi-service Digital Displacement ® Pump architecture applied to an excavator are presented. The Digital Displacement ® Pump allows for a dynamic physical displacement allocation to services at different pressure lev
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Lucier, Peter E. "Design of a digital servo-electric pump/motor displacement controller." 1995. http://catalog.hathitrust.org/api/volumes/oclc/34102780.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1995.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 67-68).
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Book chapters on the topic "Digital displacement pump"

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Maradey Lázaro, Jessica Gissella, and Carlos Borrás Pinilla. "Detection and Classification of Wear Fault in Axial Piston Pumps." In Pattern Recognition Applications in Engineering. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1839-7.ch012.

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Variable displacement axial piston hydraulic pumps (VDAP) are the heart of any hydraulic system and are commonly used in the industrial sector for its high load capacity, efficiency, and good performance in the handling of high pressures and speeds. Due to this configuration, the most common faults are related to the wear and tear of internal components, which decrease the operational performance of the hydraulic system and increase maintenance costs. So, through data acquisition such as signals of pressure and the digital processing of them, it is possible to detect, classify, and identify faults or symptoms in hydraulic machinery. These activities form the basis of a condition-based maintenance (CBM) program. This chapter shows the developed methodology to detect and classify a wear fault of valve plate taking into account six conditions and the facilities providing by wavelet analysis and ANNs.
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Conference papers on the topic "Digital displacement pump"

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Goda, Srinivas Goud, Mukesh Kumar, Vitthal K. Khandagale, and Leons Antony Lawrence. "Positive Displacement Gear Lube Pump CFD Analysis." In SAE WCX Digital Summit. SAE International, 2021. http://dx.doi.org/10.4271/2021-01-0828.

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Wang, Chunjian, Beshah Ayalew, and Zoran Filipi. "Fault Diagnosis on a Digital-Displacement Pump/Motor." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3967.

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A Digital-Displacement Pump/Motor (DDPM) has recently been proposed as an attractive candidate for hydraulic powertrain applications. A DDPM uses solenoid-controlled valves for each cylinder. This provision offers flexibility of control that can be exploited to boost system efficiency by matching individual cylinder operations with load conditions. However, the added complexity from individual cylinder control necessitates mechanisms for fault diagnosis and control reconfiguration to ensure reliable operation of the DDPM. Furthermore, available measurements are often limited to supply and retu
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Williamson, Christopher, and Noah Manring. "A More Accurate Definition of Mechanical and Volumetric Efficiencies for Digital Displacement® Pumps." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1668.

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Abstract The apparent volumetric displacement of digital displacement pumps and motors is reduced with increasing fluid pressure. So-called pump shrinkage has been documented in previous publications, where fluid compressibility effects were assumed to affect input and output power equally. In this paper, the authors derive the torque and flow rate of an ideal digital displacement pump. It is shown that the output power shrinks slightly more than the input. The difference between input and output shrinkage is counted as a power loss according to the accepted definition of total efficiency. New
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Merrill, Kyle J., Farid Y. Breidi, and John Lumkes. "Simulation Based Design and Optimization of Digital Pump/Motors." In ASME/BATH 2013 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fpmc2013-4475.

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Current state of the art variable displacement pump/motors have high efficiencies when operating at high displacements. However, as the displacement of the pump/motor is reduced, the efficiency significantly decreases. Digital pump/motors aim to increase the efficiency and range of operation of the fluid power system by minimizing leakages, friction losses and compressibility losses. It is based on the concept of actively controlling high speed on/off valves connected to each piston cylinder displacement chamber. This work involves the development of a coupled dynamic model of a digital hydrau
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Budden, Joseph J., and Christopher Williamson. "Danfoss Digital Displacement® Excavator: Test Results and Analysis." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1669.

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Abstract There is a long trend in off-highway vehicles toward higher energy efficiency and electro-hydraulic control. Digital pumps and motors are poised to become a significant enabling technology in this trend. This paper analyzes a 20-tonne tracked excavator that was equipped with digital displacement pumps and evaluated for efficiency and productivity. Previous research by Artemis Intelligent Power demonstrated improvements compared to a conventional, negative flow control excavator hydraulic system. With support from Artemis, the Danfoss Digital Displacement Excavator (DDE) is a step forw
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Manring, Noah, and Christopher Williamson. "Calculating the Mechanical and Volumetric Efficiencies for Check-Valve Type, Digital Displacement Pumps." In BATH/ASME 2018 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fpmc2018-8834.

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Methods for calculating the volumetric and mechanical efficiencies for hydrostatic pumps and motors are well known, and depend upon the precise volumetric displacement of the machine. It is also known that check-valve type, digital displacement pumps undergo an apparent reduction in volumetric displacement as pressures increase, and that this reduction in displacement is realized at both the input and output terminals of the machine. Recent work has been conducted to physically explain and quantify this apparent reduction in the volumetric displacement. In this present paper, the results of th
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Macpherson, Jill, Christopher Williamson, Matthew Green, and Niall Caldwell. "Energy Efficient Excavator Hydraulic Systems With Digital Displacement® Pump-Motors and Digital Flow Distribution." In BATH/ASME 2020 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fpmc2020-2770.

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Abstract Environmental and economic factors are driving the development of more fuel efficient off-highway vehicles. The pathway to fuel savings of greater than 50% in an excavator application through utilisation of system architectures unlocked by Digital Displacement technology is presented. Pump flow distribution using digital valves instead of traditional proportional control valves is demonstrated experimentally. The “Workbus” power distribution scheme is demonstrated on a small scale backhoe arm on a laboratory test rig. These tests do not include hydraulic energy recovery. A backward-fa
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Caldwell, Niall. "Review of Early Work on Digital Displacement® Hydrostatic Transmission Systems." In BATH/ASME 2018 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fpmc2018-8922.

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The paper describes the work done by the author (1) from 1999 to 2006 to develop the Digital Displacement Pump (DDP) and Pump/Motor (DDPM) and demonstrate the feasibility of off-highway vehicle applications. The link between DDPM capacity and the solenoid valve performance was identified. Magnetic geometry was improved by parametric FEA, then time-domain behavior was improved with a hybrid FEA/lumped-parameter model. Software improvements allowed variable speed and bidirectional operation, enabling the demonstration of the first Digital Displacement Transmission (DDT) systems on a vehicle, one
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Montzka, Alissa, Nathan Epstein, Michael Rannow, Thomas R. Chase, and Perry Y. Li. "Experimental Testing of a Variable Displacement Pump/Motor That Uses a Hydro-Mechanically Timed Digital Valving Mechanism to Achieve Partial-Stroke Piston Pressurization (PSPP)." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1693.

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Abstract This work describes an efficient means to adjust the power level of an axial piston hydraulic pump/motor. Conventionally, the displacement of a piston pump is varied by changing the stroke length of each piston. Since the losses do not decrease proportionally to the displacement, the efficiency is low at low displacements. Here, with partial-stroke piston pressurization (PSPP), displacement is varied by changing the portion of the piston stroke over which the piston is subjected to high pressure. Since leakage and friction losses drop as the displacement is decreased, higher efficienc
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Song, Xubin. "Modeling an Active Vehicle Suspension System With Application of Digital Displacement Pump Motor." In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49035.

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Vehicle suspension design can be simplified by using compressible fluid (CF) based struts. One single CF strut can provide both spring and damping force instead of two independent components of spring and shock absorber in a traditional vehicle suspension system. With the application of a digital displacement pump motor (DDPM) to modulate the fluid amount in CF struts, a hydraulic based active suspension can be developed. Each vehicle suspension corner (i.e., CF strut) can be linked to (at least) one cylinder of a multiple cylinder DDPM. Each cylinder has two poppet valves to allow exchanging
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