Relevant bibliographies by topics / Piston pressure

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Piston pressure'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Piston pressure"

1

Jiang, Wei, X. G. Qiu, Guo Zhong Chai, and Jian Xing Zhou. "Research of the Pressure Pulsation within Piston Chamber in Radial Piston Pump." Advanced Materials Research 69-70 (May 2009): 626–30. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.626.

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Noise reduction in piston pumps has been being the focus research. Many methods have been designed to smooth it. Research shows that noise takes place at the time when pistons enter the discharge port or enter the suction port. In fact, noise is induced by imbalance pressure in piston chamber. In this paper, piston initial volume and instantaneous controlled volume are deduced. Equations describing pressure angle-rate-of-change are also deduced. Keep the pressure increment equal when the pump eccentric distance is maximum and minimum, and then find out the optimal structure parameters. The parameters makes the pressure ripple minimize and makes the lowest noise.
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Aslanyan, A. E. "Influence of pressure distribution in the gap of piston-cylinder unit and properties of working fluid PES-3 on characteristics of high pressure piston-cylinder unit." Izmeritel`naya Tekhnika, no. 10 (2020): 38–42. http://dx.doi.org/10.32446/0368-1025it.2020-10-38-42.

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A simulation of the use of PES-3 liquid in a high-pressure piston-cylinder units was performed, and the parameters of the piston-cylinder units were determined in the article. The equations of the mathematical model describing the pressure change in the gap between the piston and the cylinder are given. As a result of the calculations, the pressure distributions in the gap between the piston and the cylinder are determined at under piston pressures less than 1.6 GPa. The profiles of the gaps between the deformed piston and cylinder at different under piston pressures are calculated. The dependences of the speed of lowering the piston and the effective gap on the under piston pressure at different gaps of the undeformed piston-cylinder unit are obtained. The research results can be used in the design of piston cylinder units operating on PES-3 liquid in the pressure range of 0.01–1.6 GPa.
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Kim, Dong-Jun, and Kyuho Sim. "Linear Dynamic Analysis of Free-Piston Stirling Engines on Operable Charge Pressure and Working Frequency along with Experimental Verifications." Applied Sciences 11, no. 11 (2021): 5205. http://dx.doi.org/10.3390/app11115205.

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This paper presents a linear dynamic analysis on operable charge pressure and working frequency of free-piston Stirling engines (FPSE) along with experimental verifications. The equations of motion of the FPSE are formulated as a 2-degree-of-freedom (DOF) vibration system of the power piston (PP) and displacer piston (DP), based on the state equation of ideal gas and the isothermal Stirling cycle model. The dynamic models of FPSE we considered are the 1-DOF simple vibration model of each piston and the 2-DOF root locus model of coupled pistons. We developed a test FPSE for verification of the dynamic models and conducted a series of experiments to measure the dynamic behaviors of PP and DP under varying charge pressures for various masses and stiffnesses of the PP. As a result, both prediction models showed good agreements with experimental results. The 1-DOF vibration model was found to be simple and effective for predicting the operating frequency and charge pressure of FPSE. The root locus method showed reasonable predictions with an operation criterion of the PP–DP phase angle of 90°. In addition, the FPSE was confirmed to operate in resonant oscillations when the DP–PP phase angle is 90°, based on analysis of the force vector diagram of the two pistons.
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Buyalich, Gennady, Maxim Byakov, Konstantin Buyalich, and Egor Shtenin. "Development of Powered Support Hydraulic Legs with Improved Performance." E3S Web of Conferences 105 (2019): 03025. http://dx.doi.org/10.1051/e3sconf/201910503025.

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The paper gives a description of the technical solution for the design of a hydraulic leg piston for mechanized roof supports. This technical solution allows the sealing gap to remain almost constant in a wide range of pressures of the working fluid, while significantly improving the working conditions of the lip seal on the piston. This technical solution consists in the fact that, on the side of the piston cavity of the hydraulic leg, the piston contains a sleeve with a seal located on it, which under the action of the pressure of the working fluid deforms in the radial direction, compensating for an increase in the diameter of the working cylinder. In this case, the described technical solution is not subject to inertia and is able to work with static and with dynamic external loads on a hydraulic leg. The results of a comparative finite-element simulation of the stress-strain state of a hydraulic leg at the junction of the piston and the working cylinder are given for the 360 mm dia hydraulic leg of Glinik support with serial and proposed pistons. It is shown that with the proposed piston, when the pressure of the working fluid in the piston cavity is 62 MPa, the change in the radial sealing gap is less than 20 times compared with the serial design.
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Nasibullaeva, E. Sh, E. V. Denisova, and I. Sh Nasibullayev. "Full-size mathematical model of the fuel metering unit." Proceedings of the Mavlyutov Institute of Mechanics 8, no. 1 (2011): 249–56. http://dx.doi.org/10.21662/uim2011.1.024.

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The paper presents a nonlinear mathematical model for the operation of the fuel metering unit, which takes into account the operation of the control valve, which includes two pistons and three fuel circuits. A technique for determining the initial conditions for a system of ordinary differential equations describing the movements of a servo piston, a piston of a constant pressure gradient valve and a piston of a control valve is proposed.
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Aliemeke, B. N. G., and M. H. Oladeinde. "Design of 0.67hp gasoline generator pistons." Nigerian Journal of Technology 39, no. 3 (2020): 839–43. http://dx.doi.org/10.4314/njt.v39i3.25.

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Piston is an important internal combustion engine component that works with other engine components to withstand severe stresses and high temperature that are generated in the combustion chambers. Pistons are subjected to a very high mechanical and thermal load which results from extreme pressure cycles and huge forces of inertia caused by extremely high acceleration during the reciprocating motion. The 0.67hp generator piston designed had the values of parameters to be: 51.00mm Piston stroke; 48.85mm piston bore diameter; 3.66kw brake power; 4.87kw indicated power; 11.63Nm engine torque; 3.22mm piston thickness and 9.44cm3 clearance volume. The piston parameter values calculated were found to be in accordance with the recommended range of values in the design and operating data for internal combustion engines.
 Keywords: Piston design, machine parameters and internal combustion engines.
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Manring, Noah D. "Friction Forces Within the Cylinder Bores of Swash-Plate Type Axial-Piston Pumps and Motors." Journal of Dynamic Systems, Measurement, and Control 121, no. 3 (1999): 531–37. http://dx.doi.org/10.1115/1.2802507.

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In this research, the friction within the cylinder bore of a swash-plate type axial-piston machine is examined. Unlike previous research, this work develops a mathematical model for the friction based upon lubricating conditions which are described by the well-known Stribeck curve. Furthermore, a test device is built for measuring the frictional characteristics during low pressure and low speed operation and these results are compared with the mathematical model. For high pressure and high speed considerations, a numerical investigation based upon the model is conducted and it is shown that the friction associated with a pumping piston is greater than the friction associated with a motoring piston. It is also shown that increased piston speeds usually reduce the friction within the cylinder bore; however, a “cross-over” condition may exist where the increased speed will actually increase the friction as a result of increased fluid shear. Furthermore, it is shown that speed changes have a more significant impact on motoring pistons as opposed to pumping pistons due to a difference in the location of hydrodynamic lubrication within the cylinder bore. It is noted that this difference exits due to the bore geometry and the direction of piston travel.
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Yang, Lijie, Shuai Yin, and Qingna Niu. "Water hydraulic axial piston motor cavitation characteristics based on CFD technology." World Journal of Engineering 14, no. 3 (2017): 231–36. http://dx.doi.org/10.1108/wje-11-2016-0144.

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Purpose The purpose of this paper is to analyze the cavitation characteristics of a water hydraulic axial piston motor (WHAPM) to improve the water motor performance, to reduce the vibration and noise and to prolong the service life of the motor. Design/methodology/approach The computational fluid dynamics (CFD) software PumpLinx is chosen to do cavitation analysis of the WHAPM. In this case, first, cavitation mechanism of the water piston motor is analyzed in depth. Then, considering the effects of bubble dynamics, the rate of phase transition, turbulence effects and non-condensable gas, the full cavitation model is selected, the dynamic CFD numerical model of internal flow field on the water hydraulic piston motor is established based on PumpLinx software and the fluid cavitation inside is numerically studied. Finally, the influence of the valve plate and pistons on motor cavitation is analyzed. Findings Research results show that there are two serious cavitation regions: one is the pressure transition region of the valve plate that is near the top dead center, and the other is the low-pressure region of the piston that is near the low-pressure transition area. Moreover, the more serious cavitation area is on the valve plate region. Originality/value The simulation results show that the proposed algorithm is able to detect the cavitation characteristics of the water piston motor. Besides, it is deduced that valve-plate structure optimization is more important than pistons to reduce cavitation influence.
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Torkamandi, Shahed, Farhad Asadi, and Gholamhasan Payganeh. "Increase of Fatigue on Piston and Connecting Rod in Using Supercharger." Advanced Materials Research 622-623 (December 2012): 1243–47. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.1243.

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This research deals with analysis the fatique and the failure of piston engine using FEA.The objective of this research is to develop the geometry of piston engine using solidwork software and to investigate the maximum stress using stress analysis techniques to predict the failure of piston and connecting rod and identify the critical locations of the components of EF7 engine with supercharger and without supercharger. The finite element model of the components was analyzed the static stress with linear material model . first we discuss the amount of increased pressure in cylinder by supercharger and turbocharger then the influence of the inlet air pressure on the naturall aspirated engine which the main parts of its engine are not reinforced is taken account,then the result is showed the stress is increased by quantity of 273 MPA on piston and connecting rod which make the increase of fatigue on pistons and connecting rod and decrease in its period of working.The results can also significantly reduce the cost to produce the piston,and improve product reliability and improve the fatique strength and durability.
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Zhang, Jin, Baolei Liu, Ruiqi LÜ, Qifan Yang, and Qimei Dai. "Study on Oil Film Characteristics of Piston-Cylinder Pair of Ultra-High Pressure Axial Piston Pump." Processes 8, no. 1 (2020): 68. http://dx.doi.org/10.3390/pr8010068.

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The piston-cylinder pair is the key friction pairs in the piston pump. Its performance determines the volume efficiency of piston pump. With the increase of load pressure, the leakage at the clearance of piston-cylinder pair will also increase. In order to reduce leakage, the clearance of the piston-cylinder pair of the ultra-high pressure piston pump is smaller than that of the medium-high pressure piston pump. In order to explore whether the piston will stuck in the narrow gap, it is necessary to study the oil film characteristics of the piston-cylinder pair under the condition of ultra-high pressure, so as to provide a theoretical basis for the optimal design of the piston-cylinder pair of ultra-high pressure axial piston pump. In this paper, an ultra-high pressure axial piston pump is taken as the research object, and its structural characteristics are analyzed. The mathematical model of the oil film thickness of the piston-cylinder pair is established by using the cosine theorem in the cross section of the piston. The finite volume method is used to discretize the Reynolds equation of the oil film of the piston-cylinder pair, and the over relaxation iteration method is used to solve the discrete equations, and the mathematical model of the oil film pressure of the piston-cylinder pair is obtained. The mathematical model of oil film thickness and pressure field of piston-cylinder pair is solved by programming. The dynamic change process of oil film thickness and pressure field of the plunger pair of the ultra-high pressure axial piston pump under the load of 20 MPa and 70 MPa is obtained. Under the two conditions, the thinnest area of the oil film reaches 3 μm and 2 μm dangerous area respectively; the oil film pressure reaches 20 MPa and 70 MPa respectively when the swashplate rotates 10° and continues to increase with the increase of swashplate rotation angle. When the rotation angle reaches 90°, the oil film pressure also reaches the maximum value, but there is no pressure spike phenomenon. The oil film pressure characteristics of ultra-high pressure axial piston pump under conventional and ultra-high pressure conditions were obtained by modification and experimentation.
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Dissertations / Theses on the topic "Piston pressure"

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Harrison, Adrian M. "Reduction of axial piston pump pressure ripple." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760701.

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Davaanyam, Zorigtkhuu. "Piston press test procedures for predicting energy-size reduction of high pressure grinding rolls." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54154.

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High Pressure Grinding Rolls (HPGR) have been used for over 20 years, however the technology has not received wide industry acceptance despite reports of substantial energy advantages. One barrier is that full and fair consideration cannot be given to HPGR-based comminution circuits for early-stage mining projects, because industry standard tests require large sample sizes for evaluation of the technology. The main objective of the research was to develop methodologies, requiring small sample quantities, to predict the energy–size reduction performance of HPGRs. A key outcome is the development of three piston press testing procedures that require significantly less sample than standard HPGR evaluation methods. One method, referred to as the direct calibration methodology, involves calibrating results of piston press tests against pilot-scale HPGR tests. This methodology was developed primarily for situations where HPGR test data is only available for a composite sample and the energy requirements of individual geometallurgical units within a deposit are to be determined. To address the case where HPGR test results are not available, a second method was developed which relies only on piston press testing and empirical equations that were determined from a database of pilot-scale HPGR results. The simulation-based methodology was also developed to be able to assess the impact of changes in HPGR operation or circuit configuration on comminution performance. An existing energy–breakage model was adopted and modified for application to particle-bed comminution. The three methodologies were compared by applying them to samples from a copper-gold deposit in central British Columbia. Through utilization of these methodologies, the energy–size reduction performance of the HPGR technology can be predicted with small sample requirements which can be applied to a broad range of ore types and provide a stronger statistical basis for the process design. During development of the methodologies, significant research outcomes resulted. Controlled piston press and HPGR pilot tests on the same samples confirmed that normalized product PSDs of the respective equipment can be regarded as equivalent. Furthermore, data from particle-bed comminution tests was used to determine master curves describing breakage appearance functions for the compression mode of breakage.<br>Applied Science, Faculty of<br>Mining Engineering, Keevil Institute of<br>Graduate
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Giriat, Gaetan. "Instrumentation development for magnetic and structural studies under extremes of pressure and temperature." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7931.

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The study of the magnetic and structural properties of matter under extreme conditions is a fast developing field. With the emergence of new techniques and innovative instruments for measuring physical properties, the need for compatible pressure generating devices is constantly growing. The work described in this thesis is focused on development, construction and testing of several high pressure (HP) cells of novel design. One of the cells is intended for single crystal X-ray diffraction (SXD) studies at low temperature (LT) and the other three HP devices are designed for a Magnetic Property Measurement System (MPMS), two of which are suitable for dc susceptibility studies and the other one is aimed at high frequency ac susceptibility measurements. HP crystallographic studies are routinely carried out in diamond anvil cells (DAC) at room temperature while ambient pressure SXD studies are often conducted at LT to reduce atomic vibrations and obtain more precise structural data as well as to study LT phases. Combining HP with LT gives access to a whole new area on the phase diagrams but due to the size of the existing DACs this is generally achieved by cooling down the cells inside a cryostat and it is mainly possible at synchrotrons where dedicated facilities exist. A miniature DAC which can be used with commercially available laboratory cry-flow cooling systems and achieves pressures in excess of 10 GPa has been developed. The design of the pressure cell is based on the turnbuckle principle and therefore it was called TX-DAC. Its dimensions have been minimised using Finite Element Analysis (FEA) and the final version of the cell weighs only 2.4 g. The cell is built around a pair of 600 μm culet Boehler-Almax anvils which have large conical openings for the diffracted beam. The TX-DAC is made of beryllium copper (BeCu) alloy which has good thermal conductivity and allows quick thermal equilibration of the cell. The MPMS from Quantum Design is the most popular instrument for studies of magnetic properties of materials. It is designed to measure ac and dc magnetic susceptibility of sample with detectable signals as low as 10-8 emu. The MPMS has a sample chamber bore of 9 mm in diameter and this puts a constraint on the dimensions of the pressure cells. However, several types of clamp piston-cylinder cells and DACs have been designed for the MPMS. The former are used for measurements at pressure up to 2 GPa and the later can be used for studies at higher pressure. Taking advantage of the turnbuckle principle, a DAC (TM-DAC) and a piston-cylinder cell (TM-PCC) for dc magnetic studies were built. They allow HP measurements to be performed at the full sensitivity of MPMS. Both pressure cells are made of BeCu and their small dimensions combined with symmetrical design is the key to an ideal background signal correction. The TM-DAC is 7 mm long and 7 mm in diameter, it weighs 1.5 g and with 800 μm culet anvils it can generate a sample pressure of 10 GPa. Inherently the sample volume is limited to approximately 10-3 mm3 and the signal corresponding to this volume of some weakly magnetic material remains below the sensitivity of the MPMS. This constraint led us to the development of the TM-PCC – a piston-cylinder variant of the turnbuckle design. With a 4 mm3 sample volume it allows the study of weakly magnetic samples in the range 0-1.9 GPa. The TM-PCC uses two zirconia pistons of 2.5 mm in diameter; it is 10 mm long, 7 mm in diameter and weights 2.7 g. Conventional metallic pressure cells perform well in dc mode however in ac susceptibility measurements, the Eddy currents set in the cells’ body lead to a screening effect which can significantly obscure the signal from the sample. This problem was solved by designing a composite piston-cylinder cell made with Zylon fibre and epoxy resin. The sample is located in the middle of the cell in the 2.5 mm bore and the pressure is transmitted through zirconia pistons. Keeping the metallic parts away from the sample resolves any interference issue. The composite cell performs well in a pressure range of 0-1 GPa. The performance of the pressure cells developed within this project is illustrated by studies of various systems at high pressure.
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Huang, Xiaochen, Bing Xu, and Junhui Zhang. "The influence of the swash plate oscillation on pressure ripple in variable displacement axial piston pump." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71101.

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The displacement of the variable displacement pumps can be adjusted by changing the swivel angle of the swash plate. In fact, the swivel angle oscillates because of the oscillating torque on the swash plate, which caused by the pressure fluctuation of the piston chamber. The swivel angle is most often considered as a constant value in previous studies. However, the oscillation of the swash plate leads to an additional movement of the piston, which has an impact on the pressure fluctuation and the flow ripple. In this study, an improved model of a self-supplied variable displacement pump is established. The swash plate oscillation under different operating conditions is presented. In order to investigate the effect of the swash plate oscillation on the pressure ripple, a comparison between the case of the fixed swash plate and the oscillated swash plate is conducted. Results show the pressure ripple with an oscillated swash plate shows a smaller pressure ripple. It also shows that the nine pistons and the control mechanism both affect the pressure ripple and flow fluctuation.
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Wongthep, Padipat. "Etude du régime d'écoulement du fluide dans le jeu d'un ensemble piston-cylindre en vue de l'optimisation du calcul du coefficient de déformation." Phd thesis, Paris, ENSAM, 2013. http://pastel.archives-ouvertes.fr/pastel-00918486.

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Les balances manométriques sont utilisées en métrologie des pressions statiques.Des projets européens tel qu'Euromet 463 ont mis en évidence des écarts systématiques entreles mesures expérimentales et les calculs des paramètres nécessaires à la caractérisation desbalances de référence. La vitesse de chute du piston est l'un d'eux pourtant essentiel dans laprocédure d'étalonnage. L'objectif des travaux de thèse est l'ajustement des méthodesd'estimation de cette vitesse de chute. Cela permettra d'améliorer la caractérisation du jeuinterne de la balance, de déterminer plus précisément la section effective de ce jeu et parconséquent d'améliorer l'incertitude portant sur le coefficient de déformation, paramètre clé del'étalonnage par comparaison. Jusqu'à présent le modèle de calcul de l'écoulement du fluidedans la balance était quasi unidimensionnel. Il assimilait le jeu entre le piston et le cylindre àdeux parois parallèles. Dans cette étude, les équations de l'écoulement du flu ide sont modifiéespour évaluer l'influence du modèle dans un jeu annulaire. Les corrections dues à la vitesse dechute du piston sont également prises en compte. Les calculs des déformations des structuressont réalisés en utilisant la méthode des éléments finis. Les travaux expérimentaux portent surdes ensembles piston-cylindre 50, 200 et 1000 MPa du Laboratoire National de Métrologie etd'Essais (LNE). Une confrontation calcul-expérience est réalisée en prenant en compte lesparamètres de variabilités tels que la géométrie ou les propriétés du fluide.
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Abuhaiba, Mohammad. "Mathematical Modeling and Analysis of a Variable Displacement Hydraulic Bent Axis Pump Linked to High Pressure and Low Pressure Accumulators." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1240528916.

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Dissertation (Ph.D.)--University of Toledo, 2009.<br>Typescript. "Submitted as partial fulfillment of the requirements for the Doctor of Philosophy degree in Mechanical Engineering." Bibliography: leaves 203-209.
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Elfridsson, Jon. "3D parameterized FEM modelling of a piston ring in a marine diesel engine : a simulation approch using FEM." Thesis, Umeå universitet, Institutionen för fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-38315.

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The piston ring in a marine two-stroke diesel engine operates in demanding conditions, involving high temperatures and pressures. Its main purposes are to seal the combustion chamber of the engine, minimize the frictional contact against the cylinder liner and transfer heat from the piston. The development of new piston ring designs for marine diesel engines is mainly based on engineering knowledge and expertise but is somewhat unstructured. A new method which may be used to overcome this lack of structure is to simulate the working conditions for the piston ring. This is the main objective of this thesis work, to invent a simulation method which allows accurate and distinct results to be obtained and thereby knowledge about piston ring performance. The simulation method is based on a three-dimensional geometric model of the piston ring, where the radial geometry should be described by the lathe curve from industry. It should also be implemented and function automatically as a simulation tool. In short terms, the calculated stresses and strains in the material, the contact pressure against the cylinder liner and the piston ring twist should be evaluated. The simulation tool should be able to model two different types of piston ring designs, namely straight cut design and CPR design, and both with optional dimensions. Validation of the results are performed with a simulation model which uses fewer dimensions, but also utilizes engineering knowledge from the marine industry. In addition to this, some more advanced investigations have been performed in order to demonstrate the capacity and power of the simulation tool. The simulation method appears to perform well and according to the simple model, but it also shows good prediction in more advanced investigations. For example, piston rings in overheated engines tend to twist more than usual, which could be seen in real investigations, and the behavior is easily recreated with the simulation tool. Also investigations with reduced cross sections, which is well known within high-speed engines, are performed. The method is executed automatically with the developed simulation tool which is based on ANSYS, a commercial simulation software. This software, that is commonly used in development work, uses a finite element method to solve the problem. The simulation tool is used as an external input which configures the geometry, finite element formulation and the result rendering.<br>Kolvringen i en marin tvåtaktsmotor arbetar under krävande förhållanden i form av hög temperatur och högt tryck. Dess huvudsyften är att täta motorns förbränningskammare, minimera friktion mot cylindern och transportera värme från kolven. Utvecklingen av nya kolvringsmodeller för marint bruk är huvudsakligen baserat på ingenjörskunskap och expertkunnande vilket dock lett till en viss osäkerhet. En modern metod för att bemästra denna osäkerhet är att simulera kolvringen och dess förhållanden i motorn. Det huvudsakliga målet är att skapa en simuleringsmetod som ger noggranna och tydliga resultat och därav kunskap om kolvringens påfrestningar och egenskaper under drift av motorn. Simuleringsmetoden är skapad för en tredimensionell geometri som är beskriven av bl.a. den svarvkurva som används inom industrin. Metoden skall även vara implementerad och fungera automatiskt som ett beräkningsverktyg vilket inom en rimlig tidsrymd skall beräkna intresseområden såsom spänningar, kontakttryck och twist. Det skall även vara konstruerat så att två olika kolvringmodeller skall kunna simuleras, nämligen rakskuren ring och gastät ring, och båda med valbara dimensioner. Simuleringsmetoden är bekräftad genom att jämföra med en enklare simuleringsmodell samt teknisk kunskap och resonemang. Utöver att bekräfta modellen genomförs även en del mer avancerade undersökningar för att kunna återge simuleringsverktygets verkliga effektivitet. Resultaten återger rätt karaktär och i rätt storleksordning i jämförelse med den enklare modellen men visar även på sanningenliga resultat vid mer avancerade tester. Exempelvis har överhettade motorer ofta en förstärkt twist, vilket är uppmärksammat vid mätningar, och sådana effekter kan återges med simuleringsverktyget. Även tester med förändrade tvärsnittsprofiler, vilka ofta används inom fordonsindustrin, och vilken effekt dessa profiler får på twistningen har genomförts. Metoden och det automatiska simuleringsverktyget är implementerat i den kommersiella programvaran ANSYS. Programmet använder sig av finita elementmetoden för att lösa problem och är ett vanligt program inom flera olika utvecklingsområden. Verktyget används som en extern inläsning till programmet vilket konfigurerar geometrin, finita elementformuleringen och resultatrenderingen.
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Schoemacker, Florian, Felix Fischer, and Katharina Schmitz. "Damping strategies for energy efficient pressure controllers of variable displacement pumps." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71108.

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In hydraulic-mechanically controlled variable displacement pumps, the actual pump controller produces additional power losses. Due to the low damping coefficients of all pump controller’s components, hydraulic-mechanically pressure controlled pumps use to oscillate while adjusting the pressure level in the hydraulic system. In several state-of-the-art variable pump controllers, a damping orifice connects the control actuator’s displacement chamber with the reservoir. This bypass dampens the movement of the control actuator but also leads to bypass losses during steady-state operation of the pump. A new concept for damping via feedback loops avoiding bypass losses is presented in t his paper.
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Naik, Pratin J., Ganesh K. Seeniraj, and Ram S. Chandran. "A study into forces and moments acting on the swash plate of an axial piston pump using a novel approach to reduce pressure and flow pulsations." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71105.

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In hydraulic pumps, typically in axial piston pumps, reduction of pressure and flow ripples was attempted by providing relief grooves and pre-compression for noise reduction. Pre-compression is normally achieved by using the dead space between pump ports in the valve plate. Also valve plate profile modification is required, if system operating conditions such as pump output pressure and flowrate change, to maintain optimum operating conditions for reduced pressure/flow ripple. An earlier simulation study confirmed effectiveness of varying dead centre position to reduce pressure and flow ripples. A specifically designed mechanism, outlined in the earlier work, achieves this goal by varying the dead centre position of the pump swash plate. This study reports on the findings of the effect of varying dead centre position and groove configurations on forces and moments acting on the swash plate for various operating conditions. The simulation model cited in the earlier work was used in this study. This information is vital for the design of an actuating mechanism to vary dead centre position of a pump valve plate. These simulations were run using MATLAB/Simulink and S-functions. Results of this study are promising.
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Semeniuk, Konstantin. "Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274346.

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While the free electron model can often be surprisingly successful in describing properties of solids, there are plenty of materials in which interactions between electrons are too significant to be neglected. These strongly correlated systems sometimes exhibit rather unexpected, unusual and useful phenomena, understanding of which is one of the aims of condensed matter physics. Heat capacity measurements of paramagnetic YFe$_{2}$Ge$_{2}$ give a Sommerfeld coefficient of about 100 mJ mol$^{−1}$ K$^{−2}$, which is about an order of magnitude higher than the value predicted by band structure calculations. This suggests the existence of strong electronic correlations in the compound, potentially due to proximity to an antiferromagnetic quantum critical point (QCP). Existence of the latter is also indicated by the non-Fermi liquid T$^{3/2}$ behaviour of the low temperature resistivity. Below 1.8 K a superconducting phase develops in the material, making it a rare case of a non-pnictide and non-chalcogenide iron based superconductor with the 1-2-2 structure. This thesis describes growth and study of a new generation of high quality YFe$_{2}$Ge$_{2}$ samples with residual resistance ratios reaching 200. Measurements of resistivity, heat capacity and magnetic susceptibility confirm the intrinsic and bulk character of the superconductivity, which is also argued to be of an unconventional nature. In order to test the hypothesis of the nearby QCP, resistance measurements under high pressure of up to 35 kbar have been conducted. Pressure dependence of the critical temperature of the superconductivity has been found to be rather weak. μSR measurements have been performed, but provided limited information due to sample inhomogeneity resulting in a broad distribution of the critical temperature. While the superconductivity is the result of an effective attraction between electrons, under different circumstances the electronic properties of a system can instead be dictated by the Coulomb repulsion. This is the case for another transition metal based compound NiS$_{2}$, which is a Mott insulator. Applying hydrostatic pressure of about 30 kbar brings the material across the Mott metal-insulator transition (MIT) into the metallic phase. We have used the tunnel diode oscillator (TDO) technique to measure quantum oscillations in the metallised state of NiS$_{2}$, making it possible to track the evolution of the principal Fermi surface and the associated effective mass as a function of pressure. New results are presented which access a wider pressure range than previous studies and provide strong evidence that the effective carrier mass diverges close to the Mott MIT, as expected within the Brinkman-Rice scenario and predicted in dynamical mean field theory calculations. Quantum oscillations have been measured at pressures as close to the insulating phase as 33 kbar and as high as 97 kbar. In addition to providing a valuable insight into the mechanism of the Mott MIT, this study has also demonstrated the potential of the TDO technique for studying materials at high pressures.
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Books on the topic "Piston pressure"

1

Val'eho, Mal'donado, and Nikolay Chaynov. Calculation of kinematics and dynamics of inline piston engines. INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1058850.

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The textbook discusses the kinematics and dynamics of inline piston internal combustion engines with axial and deaxial crank mechanism. The necessary material for calculating the forces and moments acting in the engine is given, the balancing of engines, the construction of vector diagrams of pressure on the crankshaft bearings are considered, examples of calculations are given.&#x0D; Meets the requirements of the federal state educational standards of higher education of the latest generation.&#x0D; For students of higher educational institutions studying in the field of training "Energy engineering".
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2

On the dynamic response of pressure transmission lines in the research of helium-charged free piston Stirling engines. National Aeronautics and Space Administration, 1989.

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3

Sherwood, Dennis, and Paul Dalby. Ideal gas processes – and two ideal gas case studies too. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198782957.003.0007.

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This chapter brings together, and builds on, the results from previous chapters to provide a succinct, and comprehensive, summary of all key relationships relating to ideal gases, including the heat and work associated with isothermal, adiabatic, isochoric and isobaric changes, and the properties of an ideal gas’s heat capacities at constant volume and constant pressure. The chapter also has two ‘case studies’ which use the ideal gas equations in broader, and more real, contexts, so showing how the equations can be used to tackle, successfully, more extensive systems. The first ‘case study’ is the Carnot cycle, and so covers all the fundamentals required for the proof of the existence of entropy as a state function; the second ‘case study’ is the ‘thermodynamic pendulum’ – a system in which a piston in an enclosed cylinder oscillates to and fro like a pendulum under gravity, in both the absence, and presence, of friction.
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United States. National Aeronautics and Space Administration., ed. Burn rates of TiH₂/KClO₄/Viton and output testing of NASA SKD26100098-301 pressure cartridges. National Aeronautics and Space Administration, 1993.

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Book chapters on the topic "Piston pressure"

1

Ravex, A., L. Duband, and P. Rolland. "Development Progress of a Long Life Twin Piston Pressure Oscillator." In Advances in Cryogenic Engineering. Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2522-6_170.

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2

Gong, Yu, Weidong Geng, Li Zhang, Chunlei Pan, and Xiaodong Wang. "Online Monitoring System for Fault Diagnostics of High-Pressure Piston Diaphragm Pump Based on Acoustic Emission." In Advances in Mechanical and Electronic Engineering. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31516-9_8.

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San Andrés, Luis, and Bonjin Koo. "Effect of Lubricant Supply Pressure on SFD Performance: Ends Sealed with O-rings and Piston Rings." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_26.

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Anderson, Orson L., and Shigeru Yamamoto. "The interrelationship of thermodynamic properties obtained by the piston-cylinder high pressure experiments and rpr high temperature experiments for NaCl." In High‐Pressure Research in Mineral Physics: A Volume in Honor of Syun‐iti Akimoto. American Geophysical Union, 1987. http://dx.doi.org/10.1029/gm039p0289.

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Eargle, John M. "Sound Pressure Level Produced by a Piston in a Large Baffle as a Function of Radiated Power and Distance." In Electroacoustical Reference Data. Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2027-6_41.

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6

Lomakin, G. V., and V. M. Myslyaev. "Evaluation of Heat Mechanical Loading of Piston of Gasoline Engine 4CH8,2/7,56 When It Is Forced at Average Effective Pressure." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22041-9_74.

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Eargle, John M. "Sound Pressure Level Produced by a Piston in a Large Baffle at a Distance of 1 Meter as a Function of Amplitude, Radius, and Frequency." In Electroacoustical Reference Data. Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2027-6_40.

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Premkumar, I. J. Isaac, A. Prabu, V. Vijayan, and S. Dinesh. "An Investigation on Piston Structural Analysis Related with Experimental Cylinder Pressures Using Different Biodiesel Blend Ratios." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4739-3_81.

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9

Selva, Y., and S. Joseph. "Body Weight Distribution and Centre of Pressure Displacement Velocity on The Shooting Score of Malaysian Rifle and Pistol Athletes- A Pilot Study." In IFMBE Proceedings. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3737-5_19.

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Kumar, Shailendra. "Design and Thermal Analysis of MgZrO3 Ceramic Coated I.C. Engine Piston Based on Finite Element Analysis (FEA)." In Advanced Numerical Simulations in Mechanical Engineering. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3722-9.ch009.

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Piston is considered to be one of the most important part of internal combustion engine. Piston is used to deliver thrust via connecting rod to the main shaft of the engine. Normally it is made of cast iron which bears high gas pressure and has damping property. The main objective of this chapter is to perform structural and thermal analysis of MgZrO3 top surface ceramic coated piston. Piston made up of gray cast iron coated with ceramic material (MgZrO3) which is bonded by special material (NiCrAl) is designed by machine design approach to determine the dimensions of the piston and Finite Element Analysis (FEA) was performed using ANSYS 17.1. The pressure of the 5 N/mm2 was applied at top land of piston. An equivalent Von misses stress in ceramic coated piston was found less in comparison to uncoated piston. Thermal analysis of both coated and non-coated piston was performed.
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Conference papers on the topic "Piston pressure"

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Kamiya, Mitsuyoshi, Toshiaki Kobayashi, Yuji Mihara, and Tsuneo Someya. "Measurement of Piston Skirt Oil-film Pressure under Piston Slap." In SAE 2007 Noise and Vibration Conference and Exhibition. SAE International, 2007. http://dx.doi.org/10.4271/2007-01-2215.

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Sarode, Shanmukh, and Lizhi Shang. "Novel Pressure Adaptive Piston Cylinder Interface Design for Axial Piston Machines." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1645.

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Abstract The paper presents a novel concept of a pressure adaptive piston/cylinder interface design for a swashplate type axial piston machine that uses a pressurized groove around the bushing inside the cylinder block. This groove is connected to the pump displacement chamber and it uses pressure deformations of the bushing to improve the sealing function of the piston/cylinder lubricating interface. Such a design concept is based on a groove design that is easy to manufacture, thus resulting in a cost-effective design solution. The proposed piston/cylinder interface design is simulated using a multi-domain simulation model developed by the authors’ research team. The tool is particularly suitable for the analysis of the internal gap flows, being based on a fully coupled fluid structure thermal interaction model, which calculates the non-isothermal gap fluid behavior considering solid body deformations due to temperature and pressure effects. The proposed solution is compared in simulation with respect to a standard design of an axial piston pump. The results indicate that the proposed pressure adaptive piston/cylinder interface is able to improve the sealing function of the piston/cylinder interface at different operating conditions. Therefore, the proposed novel design can be seen as a possible method to increase the energy efficiency of the current designs of swash plate units.
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Okamoto, Michio, and Itsuro Sakai. "Contact Pressure Distribution of Piston Rings -Calculation Based on Piston Ring Contour -." In SAE 2001 World Congress. SAE International, 2001. http://dx.doi.org/10.4271/2001-01-0571.

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Strunk, Richard D. "Silencer for Hydraulic Piston Pump Pressure Pulsations." In International Off-Highway & Powerplant Congress & Exposition. SAE International, 1991. http://dx.doi.org/10.4271/911759.

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Laney, Matthew, and Ronald Farrell. "Piston-Lift Check Valve Flow Verification Using CFD." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84672.

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Computational Fluid Dynamics (CFD) is increasingly being used as a reliable method for determining flow characteristics of a wide range of flow situations. This paper presents an extension of paper PVP2017-66269, “Check Valve Flow and Disk Lift Simulation Using CFD” [1], and utilizes some of the same concepts to characterize flow through piston-lift check valves. The previous example considered a swing check valve involving rotational movement; this example considers a vertical lift piston check valve involving translational movement. Specifically, CFD was used to determine valve flow coefficients (CV) as a function of disk lift position as well as to determine the flow rate required to achieve full open or predict intermediate disk lift positions. The CFX application, which is part of the ANSYS suite of finite element software, was used to determine the flow characteristics. As presented in PVP2017-66269, balancing flow-induced forces on the check element and considering the disk assembly weight, the valve lift behavior can be predicted. Results from the CFX analysis were compared to recent test results of a skirted disk-piston check valve and previous test results of a standard disk-piston check valve. The results showed good agreement in most cases. This validates that flow characteristics across valves with different types of check elements at different disk lift positions can be reliably predicted using CFD analysis. It is important to note that while the test results and CFD analysis showed good agreement, it was vital that actual testing be performed in order to validate the approach. This follows the recommendation outlined in the previous paper.
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6

Matsuoka, Taichi. "Liquid Inertia Damper Having a Screw Shaped Piston." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78419.

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In this paper authors propose a liquid inertia damper that has a screw shaped piston in order to have effect of a series inertia mass. The damper consists of a piston and a cylinder, a screw shaped piston. Water is filled in the cylinder. The peripheral gap of the screw can act as an orifice of a by-pass pipe, and an inertia force is produced by a liquid flow through the gap. In order to confirm the inertia force, a test damper is manufactured, and resisting force characteristics are measured. It is apparent from test results that the damper can have a sum of the inertia force and nonlinear damping force. The series inertia mass is depended on a relation between a diameter of the cylinder and a gap of the screw. To confirm the vibration reduction, harmonic frequency response of one-degree-of-freedom system with the liquid inertia damper is calculated. Finally, the effects of vibration suppression are confirmed numerically.
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Park, Tae-Jo. "Lubrication Analysis Between Piston and Cylinder in High Pressure Piston Pump Considering Circumferential Grooves and Viscosity Variation With Pressure." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59217.

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In this study, a theoretical study on the lubrication analysis of an axially moving tapered piston with circumferential grooves subjected to a large pressure gradient within cylindrical bore has been done. Taking into account viscosity variation with pressure, analytic expressions for the pressure distribution leakage are obtained solving modified one-dimensional Reynolds equation for the case that the cylinder and the multigrooved piston axis has uniform eccentricity. It is shown that the viscosity variation with pressure highly affect the pressure distribution, lateral force acting on piston and leakage flow rate. Numerical solutions of two-dimensional Reynolds equation are also presented to confirm the validity of the analytical results. It is recommended that the piston used in various piston pumps should be tapered toward its high pressure end.
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8

Getting, Ivan C., and Hartmut A. Spetzler. "Gas-charged piston-cylinder apparatus for pressures to 4 GPa." In High-pressure science and technology—1993. AIP, 1994. http://dx.doi.org/10.1063/1.46386.

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Anbukumaran, K., C. Venkateswaran, N. Victor Jaya, and S. Natarajan. "Piston-cylinder apparatus for high pressure and high temperature studies." In High-pressure science and technology—1993. AIP, 1994. http://dx.doi.org/10.1063/1.46387.

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Lettieri, T., J. Kelley, and C. Ehrlich. "Investigation of annular forces using an oscillating, gas-operated piston gauge." In High-pressure science and technology—1993. AIP, 1994. http://dx.doi.org/10.1063/1.46392.

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Reports on the topic "Piston pressure"

1

Olson, Douglas A. NIST calibration services for pressure using piston gauge standards. National Institute of Standards and Technology, 2009. http://dx.doi.org/10.6028/nist.sp.250-39e2009.

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2

Santosh Gangwal. Demonstration of a Piston Plug feed System for Feeding Coal/Biomass Mixtures across a Pressure Gradient for Application to a Commercial CBTL System. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1035865.

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3

Osada, Hideaki, Yuzo Aoyagi, Masahiro Misawa, et al. Diesel Combustion and Emission Study by Using High Boost and High Injection Pressure in a Single-Cylinder Engine (Fifth Report)~Exhaust Emissions Effected by Aluminum, Steel and FCD Pistons. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0651.

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