VIBRATION ANALYSIS OF CONSTANT POWER REGULATED SWASH PLATE AXIAL PISTON PUMPS

2003 ◽  
Vol 259 (5) ◽  
pp. 1225-1236 ◽  
Author(s):  
M.K. BAHR ◽  
J. SVOBODA ◽  
R.B. BHAT
Keyword(s):  
Vibration Analysis ◽  
Constant Power ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Axial Piston

Implementation of Single Feedback Control Loop for Constant Power Regulated Swash Plate Axial Piston Pumps

2002 ◽  
Vol 3 (3) ◽  
pp. 27-36 ◽  
Author(s):  
Medhat K. Bahr Khalil ◽  
Valery D. Yurkevich ◽  
Jaroslav Svoboda ◽  
Rama B. Bhat
Keyword(s):  
Feedback Control ◽  
Control Loop ◽  
Constant Power ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Axial Piston

Performance of Constant Power Operated Swash Plate Axial Piston Pumps With Fuzzy Logic Controllers

2013 ◽  
Author(s):  
Yasser H. Anis ◽  
Saad A. Kassem
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Dynamic Performance ◽  
Control Valve ◽  
Step Response ◽  
Pd Controller ◽  
Constant Power ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Axial Piston

In this paper, simulation of the step response of electro hydromechanically controlled constant power regulated swash plate axial piston pumps with conical cylinder blocks has been carried out when a new fuzzy logic controller (FLC) is proposed to replace the PD controller in current use. The theoretically deduced performance shows that the proposed FLC renders better performance when compared to both the PD controller and a previously proposed FLC. The effects of the control valve supply pressure, valve port width, and control piston leakage coefficient on the pump step response has been investigated. Results show that the proposed FLC renders better dynamic performance, when compared with the previously proposed FLC and the PD controller, at all practical values of the investigated three parameters.

Fuzzy Logic Control of Constant Power Regulated Swash Plate Axial Piston Pumps

2001 ◽  
Author(s):  
S. A. Kassem ◽  
M. K. Bahr
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Dynamic Performance ◽  
Pd Controller ◽  
Constant Power ◽  
Practical Applications ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
The Impact ◽  
Axial Piston

Abstract This paper presents a theoretical study of some aspects of the dynamics of electrically controlled constant power regulated swash plate axial piston pumps with conical cylinder blocks. The mathematical model of the pump is derived. Simulation of the pump dynamic characteristics is carried out when the controller is a conventional PD one used currently in practical applications. The good agreement between the simulation and the experimental results validates the derived model. A fuzzy logic controller (FZC) is proposed to replace the PD controller. The simulation results show that the FZC yields better dynamic performance and is more robust as compared with the PD controller. The FZC is also shown to reduce the oscillations of the proportional valve spool at each swash plate inclination angle, which increases the valve service life and reduces the generated heat in it. In case of pumps of large geometric volumes the FZC is found also to reduce the impact of the control piston at the end of the stroke.

Numerical Simulation of a Slipper Model for Swash Plate Type Axial Piston Pumps and Motors: Effects of Concave and Convex Surface Geometry

2012 ◽  
Vol 6 (4) ◽  
pp. 434-439 ◽  
Author(s):  
Toshiharu Kazama ◽  
◽  
Yukihito Narita
Keyword(s):  
Convex Surface ◽  
Sliding Surface ◽  
Surface Geometry ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Convex Geometries ◽  
Thrust Pad ◽  
Axial Piston ◽  
Plate Type ◽  
Load Conditions

In this study, the slipper of swash plate axial piston pumps and motors is modeled as a hybrid (hydrostatic and hydrodynamic) thrust pad bearing. The effects of the slightly concave and convex geometries of the slipper sliding surface are examined. The motion of the slipper model is numerically simulated, and its tribological characteristics are examined under eccentric and dynamic load conditions. The calculations under these conditions indicate that, for the concave slipper, the fluctuation of the bearing pad azimuth increases, and the attitude of the slipper becomes unstable. In contrast, for the convex slipper, the attitude becomes stable, but the clearance increases.

scholarly journals A Study on Design of Notches in Valve Plate of Swash Plate Type Axial Piston Pumps Operated Bi-directionally

2016 ◽  
Vol 13 (3) ◽  
pp. 39-46
Author(s):  
Sae Ryung Choi ◽  
Ill Yeong Lee ◽  
Sung Min Han ◽  
Jung Woo Shin
Keyword(s):  
Valve Plate ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Axial Piston ◽  
Plate Type

The influence of dynamic swash plate vibration on outlet flow ripple in constant power variable-displacement piston pump

2019 ◽  
Vol 233 (14) ◽  
pp. 4914-4933 ◽  
Author(s):  
Yang Pan ◽  
Yibo Li ◽  
Dedong Liang
Keyword(s):  
Theoretical Model ◽  
Piston Pump ◽  
Plate Vibration ◽  
Axial Piston Pump ◽  
Constant Power ◽  
Flow Ripple ◽  
Swash Plate ◽  
Variable Displacement ◽  
Outlet Flow ◽  
Axial Piston

The vibration of a swash plate is caused by the piston forces and the control actuator acting on the swash plate. An earlier study of the outlet flow ripple of variable-displacement axial piston pumps assumed a fixed swash plate angle; it ignored the influence of swash plate vibration on the outlet flow ripple of the axial piston pump. In this work, a theoretical model of the outlet flow ripple and pressure pulsation was established in a constant power variable-displacement piston pump. The vibration of swash plate, flow leakage, and valve dynamic characteristics are considered in the theoretical model. The computational results of the theoretical model at different external load pressures are verified by comparison with experimental results. The vibration of the swash plate is strongly influenced by both the piston chamber pressure variation and the control actuator mechanism. The study proved the influence of the swash plate vibration on the outlet flow ripple and the pressure pulsation of an axial piston pump. Compared to the case of a fixed swash plate angle, accounting for swash plate vibration is much more suitable for the accurate determination of the outlet flow ripple and pressure pulsation of an axial piston pump. It is also shown that the vibration of the swash plate affects the valve plate design. Accordingly, valve plate optimization based on the theoretical model of the outlet flow ripple was also studied in this work. The amplitude of the instantaneous outlet flow ripple was considered as the optimization objective function. Finally, the optimized design parameters for a constant power variable-displacement swash plate axial piston pump were evaluated.

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