scholarly journals A Single Stage Spool Valve for the Pressure Compensator of a Variable Displacement Pump – Design, Dynamic Simulation and Comparative Study With A Real Pump

2021 ◽  
Author(s):  
Nitesh Mondal ◽  
Rana Saha ◽  
Dipankar Sanyal
Keyword(s):  
Comparative Study ◽  
Design Sensitivity ◽  
Single Stage ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Pump Design ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Spool Valve ◽  
Axial Piston

Abstract The study is focused on the design of a simplified spool valve to be incorporated in the pressure compensator of a variable displacement axial piston pump in order to perform a comparative study with a commercial pump having a two stage spool valve in its compensator. The design involves evaluation of the spool size and selection of spring from static equilibrium condition to satisfy cut-in and cut-off pressure. Following the development of dynamic model of the system, a design sensitivity analysis of the spool valve has been carried out through simulation to identify the critical sizes of the parameters, which affect the pump performance. By systematic design, it is possible to have a single stage spool valve controlled pressure compensator that can produce performance of the variable displacement axial piston pump at par with the similar commercially available pump.

Leakage Based Condition Monitoring and Pressure Control of the Swashplate Axial Piston Pump

2019 ◽  
Author(s):  
Neeraj Kumar ◽  
Bikash Kumar Sarkar ◽  
Subhendu Maity
Keyword(s):  
Hydraulic System ◽  
Pressure Control ◽  
Piston Pump ◽  
Chamber Pressure ◽  
Leakage Flow ◽  
Axial Piston Pump ◽  
Highly Nonlinear ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Axial Piston

Abstract This research mainly focused on the axial piston variable displacement pump, which is the most important part of the fluid power system. The variable displacement axial piston has been found as versatile and flexible for electro-hydraulic applications. Heavy industries such as automobile, aircraft, and mining use an axial piston pump due to its high power to weight ratio, continuous variable power transmission, low inertia, self-lubricating properties, and good controllability. The main challenges with the hydraulic system are highly nonlinear, leakages, unknown external disturbance, etc. The mathematical model of the variable displacement pump along with swashplate control has been developed. The model is used to identify the pump health condition with pressure and flow measurement, i.e., ripple pattern. The pressure and flow ripple will vary from the regular pattern due to wear and tear, i.e., increased leakage flow. The main source of the increase in leakage flow is due to wear in piston and cylinder bore. The piston chamber pressure, kinematical flow, and discharge area model of the pump has been validated with the existing results. The pump pressure control is very much essential for the enhancement of the performance of the electro-hydraulic system. In the present study, a conventional PID controller has been used as a backup to maintain system performance within the permissible faults. The electro-hydraulic system has been employed for swash-plate control of the pump to obtain desire pressure flow at the exit of the pump. MATLAB Simulink has been used for the simulation study of the pump.

A novel method to design pressure compensator for variable displacement axial piston pump

2018 ◽  
Vol 233 (2) ◽  
pp. 314-334 ◽  
Author(s):  
Nitesh Mondal ◽  
Rana Saha ◽  
Saikat Mookherjee ◽  
Dipankar Sanyal
Keyword(s):  
Energy Saving ◽  
Dynamic Simulation ◽  
Design Procedure ◽  
Design Sensitivity ◽  
Piston Pump ◽  
Experimental Result ◽  
Axial Piston Pump ◽  
Critical Dimensions ◽  
Variable Displacement ◽  
Axial Piston

An innovative design procedure has been formulated by developing a mathematical model for the pressure compensator of an axial piston pump. The compensator provides energy saving by making the pump variable displacement type depending on the system load, thereby providing energy saving by better resource management. The procedure involves simple static design steps to ensure a balanced swiveling torque on the swash plate for specified cut-in and cut-off pressure limits. Adopting the basic pump model from the earlier works, the dynamic model of the pump has been updated by including the compensator dynamics. A design sensitivity analysis through dynamic simulation has been performed that corroborates the need of the design through torque balancing. Also, through dynamic simulation, tolerances of some critical dimensions have been identified. The pressure compensator model has been validated against experimental result obtained from a reference pump.

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.

Nonlinear control of a variable displacement axial piston pump

PAMM ◽  
2006 ◽  
Vol 6 (1) ◽  
pp. 805-806
Author(s):  
Franz Fuchshumer ◽  
Andreas Kugi
Keyword(s):  
Nonlinear Control ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Variable Displacement ◽  
Axial Piston

Discharge Flow Ripple of Axial Piston Pump with Conical Cylinder Block

2010 ◽  
Vol 34-35 ◽  
pp. 440-445
Author(s):  
Lei Li ◽  
Jian Ke ◽  
Jia Xu ◽  
Wang Yong
Keyword(s):  
Block Design ◽  
Cone Angle ◽  
Point Of View ◽  
Piston Pump ◽  
Cylinder Block ◽  
Axial Piston Pump ◽  
Discharge Flow ◽  
Flow Ripple ◽  
Displacement Pump ◽  
Axial Piston

The discharge flow ripple is a crucial criterion for evaluating the piston pump. This research examines the discharge flow ripple of axial piston pump with conical cylinder block by developing a comprehensive mathematical model based upon the Bernoulli equation and the continuity equation. The novel aspect of this research is that it includes the analysis of cylinder block cone angle. From the results of this research, it can be concluded that cylinder block cone angle has a significant impact on the discharge flow ripple, and utilizing a conical cylinder block design is more feasible than cylindrical cylinder block from a flow ripple point of view. This conclusion can be used to guide the up-front design for the variable displacement pump.

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%.

Sign in / Sign up

Export Citation Format

Share Document