Numerical Study Optimal Timing of the Axial Piston Pump

2011 ◽  
Author(s):  
Shusen Zhang ◽  
Noah D. Manring ◽  
Viral S. Mehta
Keyword(s):  
Numerical Study ◽  
Dynamic Pressure ◽  
Piston Pump ◽  
Optimal Timing ◽  
Axial Piston Pump ◽  
Pump Design ◽  
Inlet Port ◽  
Actual Design ◽  
Pressure Ripple ◽  
Axial Piston

In this paper, the theoretical optimal timing of the axial piston pump is first derived to confirm the analysis published by Professor Kevin Edge [1]. It is discovered that the optimal discharge port delay is different from the optimal inlet port delay. The dimensional analysis also shows that higher shaft angular velocity indicates less delay required in both discharge port and inlet port. Numerical studies show that optimal timing can reduce the dynamic pressure ripple greatly, but since it does not affect the kinematic component, it will not eliminate the entire pressure ripple. The optimal timing could also induce an increase in efficiency where the baseline pump design has cross-porting. However, there is certain tradeoff between pressure ripple reduction and efficiency consideration. Actual design consideration to affect independent timing of the portplate is not studied in this work.

A Fast and Effective Method for the Optimization of the Valve Plate of Swashplate Axial Piston Pumps

2021 ◽  
Author(s):  
Gianluca Marinaro ◽  
Emma Frosina ◽  
Kim Stelson ◽  
Adolfo Senatore
Keyword(s):  
Numerical Model ◽  
Dynamic Pressure ◽  
Valve Plate ◽  
Lumped Parameter Model ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Flow Ripple ◽  
Lumped Parameter ◽  
Pressure Ripple ◽  
Axial Piston

Abstract This research presents a lumped parameter numerical model aimed at designing and optimizing an axial piston pump. For the first time, it has been shown that a lumped parameter model can accurately model axial piston pump dynamics based on a comparison with CFD models and experimental results. Since the method is much more efficient than CFD, it can optimize the design. Both steady-state and dynamic behaviors have been analyzed. The model results have been compared with experimental data, showing a good capacity in predicting the pump performance, including pressure ripple. The swashplate dynamics have been investigated experimentally, measuring the dynamic pressure which controls the pump displacement; a comparison with the numerical model results confirmed the high accuracy. An optimization process has been conducted on the valve plate geometry to control fluid-born noise by flow ripple reduction. The NLPQL algorithm is used since it is suitable for this study. The objective function to minimize is the well-known function, the Non-Uniformity Grade, a parameter directly correlated with flow ripple. A prototype of the best design has been realized and tested, confirming a reduction in the pressure ripple. An endurance test was also conducted. As predicted from the numerical model, a significant reduction of cavitation erosion was observed.

A Novel Axial Piston Pump/Motor Principle With Floating Pistons: Design and Testing

2018 ◽  
Author(s):  
Liselott Ericson ◽  
Jonas Forssell
Keyword(s):  
Low Noise ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Pump Design ◽  
Main Challenge ◽  
Piston Seal ◽  
Displacement Angle ◽  
Type Machine ◽  
Expected Benefits ◽  
Axial Piston

This paper presents the first prototype of a novel axial piston pump/motor of slipper type. The pistons are floating in the cylinders and hence the name floating piston pump. The novel pump design fills a gap in the traditional pump design. The pump is made to fit the automobile requirements to use fluid power in a more prominent manner. One of the expected benefits of this design is its simplicity and therefore the machine does not require high manufacturing capabilities. The production cost is expected to be low. The machine is designed with high number of pistons, which leads to a pump/motor with low noise level. The displacement angle is small, 8 degrees, which leads to low piston speeds with its benefits. The main challenge in the design is the piston seal configuration. The seals will both, deform (ovality) and move in a circle relative to the pistons. The paper discusses design considerations and proposes a design. The efficiency measurement of the first prototype is in level of a series produced slipper type machine at its sweet spot.

The Shaft Torque of a Tandem Axial-Piston Pump

2006 ◽  
Vol 129 (3) ◽  
pp. 367-371 ◽  
Author(s):  
Noah D. Manring ◽  
Viral S. Mehta ◽  
Frank J. Raab ◽  
Kevin J. Graf
Keyword(s):  
Angular Position ◽  
Single Pulse ◽  
Torque Ripple ◽  
Piston Pump ◽  
Additional Parameter ◽  
Axial Piston Pump ◽  
Pump Design ◽  
Ripple Amplitude ◽  
Shaft Torque ◽  
Axial Piston

The objective of this study is to identify the best indexed position of two rotating groups within a tandem axial-piston pump for attenuating the torque ripple amplitude that is exerted on the shaft. By attenuating the torque ripple characteristics of the pump, other vibration aspects of the machine are also expected to be reduced. In particular, the objectives of this paper are aimed at reducing the noise that is generated by the pump. This paper begins by considering the theoretical torque ripple that is created by the discrete pumping elements of a single rotating group within an axial piston machine. From this analysis, an equation is produced that describes a single pulse for the torque ripple as a function of the average torque and the total number of pistons that are used within the rotating group. By superposing another rotating group on top of the first, and by indexing the angular position of one rotating group relative to the other, a second equation is produced for describing the theoretical torque ripple of a tandem pump design. This equation is also a function of the average shaft torque and the total number of pistons that are used within a single rotating group; however, an additional parameter known as the index angle also appears in this result. This index angle is shown to amplify or attenuate the amplitude of the torque ripple depending upon its value. From these results, it is shown that a proper selection of the index angle can reduce the torque ripple amplitude by as much as 75%.

Optimal Control Theory Applied to Pressure-Controlled Axial Piston Pump Design

1990 ◽  
Vol 112 (3) ◽  
pp. 475-481 ◽  
Author(s):  
S. J. Lin ◽  
A. Akers
Keyword(s):  
Optimal Control ◽  
Control Theory ◽  
Optimal Control Theory ◽  
Control Valve ◽  
Open Loop ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Response Curves ◽  
Pump Design ◽  
Axial Piston

This work presents a study of the applicability of optimal control theory to the design of a pressure regulator by use of an axial piston pump with a two-stage electrohydraulic servovalve. The control valve has been modeled and an optimal control law has been formulated. The time response curves due to a step input in flow rate to the pump have been obtained for the open loop and the for the optimal control system. An examination of the results has shown that the performance, in terms of pressure peaks and frequency during recovery to the flow disturbance, is significantly improved over that obtained when a single-stage valve is used.

Load and Stress Analysis for the Swash Plate of an Axial Piston Pump/Motor

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
M. Z. Norhirni ◽  
M. Hamdi ◽  
S. Nurmaya Musa ◽  
L. H. Saw ◽  
N. A. Mardi ◽  
...  
Keyword(s):  
Hybrid Vehicles ◽  
Piston Pump ◽  
Control Force ◽  
Axial Piston Pump ◽  
Closed Loop System ◽  
Element Analysis ◽  
Pump Design ◽  
Braking System ◽  
Swash Plate ◽  
Axial Piston

In an axial piston pump design, the swash plate plays an important role in controlling the displacement of the pump, especially in a closed loop system. In this paper, the axial piston pump is incorporated into the design of a hydraulic regenerative braking system for hybrid vehicles. The pump in this configuration should function in dual mode, as a pump and as a motor. For this to occur, the swash plate should swing in two opposite directions. The swash plate presented in this paper is designed for stability and ease of control. Analytical analysis of torque and forces were conducted using MATLAB software to verify the motion of the swash plate. Furthermore, finite element analysis was also carried out to evaluate the rigidity and stress in the system. The analytical evaluation has shown that as the swash plate angle increases, the required control force and torque increase almost linearly. However, the change of the plate angle was found to have no effect on the force exerted on the X-axis and the torque exerted on the Z-axis.

scholarly journals Numerical study on tribological performance of the floating valve-plate pair in axial piston pump

2020 ◽  
Vol 12 (11) ◽  
pp. 168781402096832
Author(s):  
Tao Wang ◽  
Yuan Yin ◽  
Hujiang Wang ◽  
Guangming Zhou ◽  
Weifeng Huang ◽  
...  
Keyword(s):  
Numerical Study ◽  
Tribological Performance ◽  
Valve Plate ◽  
Time Dependent ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Plate Interface ◽  
Proposed Model ◽  
Set Up ◽  
Axial Piston

A numerical model for studying the time-dependent tribological performance of the floating valve-plate pair in axial piston pump is proposed. The lubrication analysis and the dynamics of the floating valve plate are taken into consideration. An additional source term is adopted into time-dependent Reynolds equation so that the model to analyze the auxiliary balance effects is set up. The boundary pressure of the kidney ports is dynamically coupled with the flow rate towards the loading. It is found that all the performance parameters fluctuate periodically and the valve-plate interface tilt has a vital impact on the tribological performances. The results obtained by the proposed model are highly detailed, and help to improve the understanding of floating valve-plate pair.

Thermodynamic characteristics research of a water lubricating axial piston pump

2020 ◽  
Vol 234 (19) ◽  
pp. 3873-3889 ◽  
Author(s):  
Donglin Li ◽  
Geqiang Li ◽  
Jianhai Han ◽  
Yinshui Liu ◽  
Defa Wu
Keyword(s):  
Steady State ◽  
Water Temperature ◽  
Thermodynamic Model ◽  
Thermodynamic Characteristics ◽  
Piston Pump ◽  
Extreme Conditions ◽  
Axial Piston Pump ◽  
Pump Design ◽  
Cooling Design ◽  
Axial Piston

A water lubricating axial piston pump (WLAP) is one of the key components in water hydraulic systems. However, the characteristics of water, including low viscosity, strong corrosiveness, and easy vaporization, results in the increase of friction and wear of pairs, and the increase of temperature. Compared with oil pumps, the thermodynamic characteristic of WLAP is more serious. In this paper, the integrated thermodynamic model of WLAP, which includes heat generation of pairs and heat conduction of water and air, is established to improve pump design. The calculation results show that the water temperature of WLAP exceeded 90 ℃, and the pump could not work normally in extreme conditions (the inlet water temperature and ambient temperature are both 50 ℃). Consequently, a cooling design of WLAP, which circulates the inlet water in the pump chamber, is carried out. Then, the thermodynamic model was modified. Based on this model, the temperature rise characteristics and heat dissipation characteristics of the WLAP are analyzed. The steady-state water temperature of pump shell under extreme conditions is obtained. The temperature sensors and a thermal imaging were used to measure the temperatures of the WLAP. The results indicate that the water temperature of WLAP decreases significantly. The difference of the steady-state temperature of WLAP between simulation and experiment is less than 4 ℃, and its temperature distribution is uniform. Therefore, the cooling design of WLAP is effective and it can work normally under the maximum speed and pressure in extreme conditions.

Kinematics Modelling and Simulation of Aero-Engine Fuel Piston Pump

2014 ◽  
Vol 680 ◽  
pp. 299-302
Author(s):  
Jiang Feng Fu ◽  
Hua Cong Li ◽  
Jia Li ◽  
Shu Hong Wang
Keyword(s):  
Displacement Velocity ◽  
Piston Pump ◽  
Engine Fuel ◽  
Axial Piston Pump ◽  
Spherical Coordinate ◽  
Pump Design ◽  
Aero Engine ◽  
Axial Piston ◽  
Kinematics Parameters ◽  
Parameters Calculation

Kinematics parameters calculation is the basis of piston pump design and performance analysis. Taking an axial piston pump with incline piston and spherical swash plate as the research object, Aimed at the deficiency of current formula for calculating piston pump kinematics parameters which included displacement, velocity and acceleration. In this paper, according to piston pump part motion geometry relationship, a correction kinematics algorithm is deduced by using the the spherical coordinate and cartesian coordinate transformation method, the analyse method and deduction procedure ensure the new calculating formula are precise in theory. Applying the calculating formula to an aero engine fuel axial piston pump, results show that. The displacement, velocity, acceleration according to the kinematics principle of piston pump, it can be used in the kind of piston pump kinematics parameters calculation and current calculating method evaluation.

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